2.4 GHz Band Wireless unit
SWL31-ETMC
SWL31-R4ML

User's Manual(Detailed Version)
Thank you for purchasing our 2.4 GHz Wireless unit (hereinafter called "Wireless unit").
For using the Wireless unit correctly and safely, at first please read this manual carefully
before using it to understand sufficiently its functions and performance.

Cautions
1. Do not copy this user's manual without permission.
2. Please note that descriptions in this manual may be changed without prior notification.

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 Table of Contents
1.

SAFETY PRECAUTIONS ......................................................................................................................... 3

2.

CHECKING PACKAGE ............................................................................................................................. 6

3. Antenna (sold separately) ............................................................................................................................ 6
4.

NAME/FUNCTION OF EACH SECTION .................................................................................................. 75.

WIRELESS UNIT INSTALLATION ENVIRONMENT ................................................................................ 9

6.

SYSTEM CONFIGURATION .................................................................................................................. 10

7.

INSTALLATION PROCEDURE ............................................................................................................... 12
7-1. Installation........................................................................................................................................ 13
7-2. Wiring ............................................................................................................................................... 148.

CHECKING RADIO COMMUNICATIONS .............................................................................................. 15

9.

ABOUT SETTING UTILITY..................................................................................................................... 16

10. BUTTON SETTING PARAMETER LIST................................................................................................. 17
11. BUTTON OPERATION METHOD........................................................................................................... 23
12. ERROR CODE LIST ............................................................................................................................... 27
13. SPECIFICATIONS .................................................................................................................................. 29
13-1. General Specifications..................................................................................................................... 29
13-2. Communication Specifications ........................................................................................................ 30
13-3. Mesh Communication ...................................................................................................................... 31
13-4. The Maximum Number of Relay Units ............................................................................................ 32
13-5. Slave Station Interface Specifications ............................................................................................. 32
13-6. Input Specifications ......................................................................................................................... 33
13-7. Output Specifications....................................................................................................................... 34
13-8. Pulse Count Specifications .............................................................................................................. 35
13-9. Terminal Block Specifications .......................................................................................................... 36
13-10. Appearance Specifications .......................................................................................................... 37
14. AUTHENTICATION STANDARDS.......................................................................................................... 38
15. FUNCTIONS REALIZED WITH SYSTEM AREA ................................................................................... 39
16. ADDRESS ASSIGNMENT CHANGE WHEN EXTENSION UNIT ADDED TO RADIO SLAVE STATION .............. 41

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1. SAFETY PRECAUTIONS(Please be sure to read them before using the product.)
Please carefully read this manual before using the product and pay full attention to safety in order tohandle the product correctly.
Precautions given in this manual relate only to this product.
In this "1. SAFETY PRECAUTIONS," the safety precautions are ranked as "WARNING" and"CAUTION."WARNING

Indicates that incorrect handling may cause hazardous
conditions, resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous

CAUTIONconditions, resulting in moderate or minor injury or only
material damage.

Note that the CAUTION level may lead to serious consequences according to the circumstances.
Be sure to follow the instructions of both levels since they are important to personal safety.
Please be sure to pass this manual on to the end users.
In addition, please keep it in a safe place so that you can read it when needed.

[WIRING PRECAUTIONS]WARNING● Be sure to block the power supply externally for all phases before wiring, otherwise an electric
shock or product damage may occur.

CAUTION● Check the rated voltage and terminal layout of the product and correctly execute wiring for theterminal block. A wrong rated power supply or wrong wiring may cause fires or breakdowns.
● Be careful not to let foreign matter such as sawdust or wire chips get inside the product. Fires,
breakdowns and malfunctions may occur.

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[DESIGN PRECAUTIONS]WARNING● An external safety circuit shall be installed to this product so that the whole system operates atthe safety side, even if an abnormality of an external power supply has an abnormality, or abreakdown of this product. Erroneous output and malfunctions may cause an accident.
(1) Interlock circuits for conflicting operations such as forward/backward rotation or formachine damage prevention such as upper/lower limits shall be configured outside of the
product.
(2) If this product detects a communication abnormality, it will stop operation and set all
outputs to OFF/HOLD. In addition, if an input/output control section has an abnormality
which cannot be detected by the microcomputer within this product, all outputs may beturned on. In such case, an external fail-safe circuit or mechanism shall be installed forthis product so that the machine operates at the safe side.
(3) Outputs may be set to on or off at all times depending on a breakdown of an output circuit
transistor etc. For output signals which may cause serious accidents, an externalmonitoring circuit shall be installed.
● A fuse or other safety circuits shall be installed externally since smoke/fires may occur if a load
current which is higher than the rated current or an over current by a load short circuit flows
continuously for a long time.
● A circuit of the external power supply for input/output circuits shall be configured so that thepower supply is turned on after the power supply for this product is turned on. If the external
power supply is turned on first, erroneous output or malfunctions may cause an accident.

CAUTION● Control wires and power supply cables shall not be bundled with the main circuit and powerwires or be laid close to them. Separate them by 100 mm (3.9 in) or more. Noise may cause
malfunction.
● An output circuit with a margin in the rated current shall be selected, because large currents(ten times greater than normal ones) may flow when the output is set to ON from OFF on
control of lamp load or others at the output circuit.

[INSTALLATION PRECAUTIONS]CAUTION● This product shall be used with the environmental specifications described in this user's
manual. If it used in an environment outside of the environmental specification range, electric
shocks, fires, malfunctions, product damage, or degradation may occur.
● Do not directly touch the conductive section of this product. Malfunctions and breakdowns may
occur.
● When installing the wireless unit, avoid the area around the processing machine. Noise andother factors may cause communication problems.
● The combination of antenna and wireless unit has been certified to comply with technicalstandards, so please do not combine it with an antenna of a different compatible model or anantenna made by another company.

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[STARTING/MAINTENANCE PRECAUTIONS]WARNING● Do not touch terminals while the product is energized. An electric shock may occur.
● Be sure to block power supply externally for all phases before cleaning.
If all phases are not blocked, an electric shock may occur.
Tightening screws too much may damage the product causing it to fall.

CAUTION● Do not disassemble or modify the product. Breakdowns, malfunctions, injuries, or fires may
occur. Also, that is prohibited by the Radio Law.

[DISPOSAL PRECAUTIONS]CAUTION● When this product is disposed of, it shall be handled as industrial waste.

警語
經型式認證合格之低功率射頻電機，非經許可，公司、商號或使用者均不得擅自變更頻率、
加大功率或變更原設計之特性及功能。
低功率射頻電機之使用不得影響飛航安全及干擾合法通信；經發現有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。
前項合法通信，指依電信法規定作業之無線電通信。低功率射頻電機須忍受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾。

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2. CHECKING PACKAGE
Open the package and check the package to see if the set you have ordered is included.
Set model name(1) SWL31-ETMC(2) SWL31-R4ML

No.

Item name

1
2
3
4
5

2.4 GHz Band Wireless unit SWL31-ETMC (Master Station)
2.4 GHz Band Wireless unit SWL31-R4ML (Slave Station)
DIN Rail Mounting Attachment
DRT-1
Attachment Fixing Screws (Pan Tapping Screws M3 x 8)
User's Manual (Hardware Version)

Set Contents
(1)
(2)
1
―
―
1
1
1
1
1
1
1

※Antennas must be purchased separately, refer to 3. Antenna (sold separately)

3. Antenna (sold separately)(1) SWL31-ANP(2) SWL31-ANT

No.
1
2

Item name
Pencil Type Antenna
Flange Head Type Antenna (Cord 2 m (78.7 in)) ※SWL31-ANP
SWL31-ANT※If you buy Flange Head Type Antenna, you will get Flange Head Type Antenna Fixture Set

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4. NAME/FUNCTION OF EACH SECTION● SWL31-ETMC (Master Station)

Status Monitor
Antenna
Radio Monitor

Ethernet Monitor

Operation Buttons

USB Connector
SWL31-ETMC

Terminal Block
Stopper

Ethernet Connector

Category

Name
Antenna
PW

Radio Monitor
TX
RX

Status Monitor(Seven Segment)

Ethernet
Monitor

100M
SD
RD
MODE/BACK

Operation
Buttons▼ (Down key)
▲ (Up key)
SET
Terminal Block
Stopper

Ethernet Connector
USB Connector

Explanation
A pencil type or flange head type (antenna)
Lighting-on: Power on, normal communications
Blinking:
Power on, error occurred, parameter setting
mode activatedLighting-off: Power off
Lighting-on while radio data are transmitted
Lighting-on while radio data are received
Various displays with operation modes• In Normal Mode
Normal communication: The channel number isdisplayed.
Error occurred: The error number is displayed.
• In Parameter Setting Mode: The parameter number isdisplayed.
• In Radio Wave Intensity Mode: The Received signal
strength level is displayed.
Lighting-on during 100BASE-TX communications
Lighting-on during data transmission
Lighting-on during data reception
Operation mode switching and hierarchy transfer inParameter Setting Mode
Parameter no./value increase/decrease in Parameter
Setting Mode
Hierarchy transfer in Parameter Setting Mode
Refer to Section 13-9 Terminal Block Specification.
Press the stopper to insert an electric wire and leave it to
fix the wire.
A PLC is connected with an Ethernet cable forcommunications.
A PC is connected to the USB connector for using theSetting Utility (SWL31-UT1).
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● SWL31-R4ML (Slave Station and Relay Station)

Status Monitor
Antenna
Radio Monitor

I/O Monitor

Operation Buttons

USB Connector
SWL31-R4ML

Terminal Block
Stopper
Category

Name
Antenna
PW

Radio Monitor
TX
RX

Status Monitor(Seven Segment)

X0, X1I/O Monitor
Y0, Y1
MODE/BACK
Operation
Buttons▼ (Down key)
▲ (Up key)
SET
Terminal Block
StopperUSB Connector

Explanation
A pencil type or flange head type (antenna)
Lighting-on: Power on, normal communications
Blinking:
Power on, error occurred, parameter setting
mode activatedLighting-off: Power off
Lighting-on while radio data are transmitted
Blinking while radio link is connected
Various displays with operation modes• In Normal Mode
Normal communication: The channel number isdisplayed.
Error occurred: The error number is displayed.
• In Parameter Setting Mode: The parameter number isdisplayed.
• In Radio Wave Intensity Mode: The Received signal
strength level is displayed.
Lighting-on when X0 or X1 signal is input to the terminal
block
Lighting-on when Y0 or Y1 signal is output from theterminal block
Operation mode switching and hierarchy transfer inParameter Setting Mode
Parameter no./value increase/decrease in Parameter
Setting Mode
Hierarchy transfer in Parameter Setting Mode
Refer to Section 13-9 Terminal Block Specification.
Press the stopper to insert an electric wire and leave it to
fix the wire.
A PC is connected to the USB connector for using theSetting Utility (SWL31-UT1).
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5. WIRELESS UNIT INSTALLATION ENVIRONMENT● Installation Environment
Install the Wireless unit avoiding the following environments.
• A place with direct sun light• A place with extremely high humidity• A place with corrosive or inflammable gases• A place with intense electric field or ferromagnetic field occurrence● Request on Installing Wireless unit
The Wireless unit transmits/receives data using radio waves. For using it with stablecommunication status, install it paying attention on the following.
• Install the antennas of the units which communicate parallel to each other as much as
possible.
• Place metallic plates and concrete walls away from the antenna as far as possible (0.3 m(11.8 in) at least).
• Install the antenna at a place 1.5 m (59.1 in) or higher from the floor to prevent impact frommoving objects (including human bodies).
• When communications are checked with a temporal installation, the unit shall be installed
on a control board or others which the unit is actually to be installed because
communications are affected by the environment near the fixing part such as metal andconcrete. (If the Wireless unit is installed in a metallic control board, install the flange headantenna outside of the board.)• The Wireless unit and antenna are indoor types.
If they are used outdoors, place them avoiding water (rain, fog, snow, etc.) and direct sun lightin a nonmetallic container such as a plastic case for outdoors.
Impact of water on the communication distance is assumed for electric wave characteristics.
In addition, if the plastic case has a metallic plate embedded, it shall not be used because it will
be an obstruction and significantly affect the communication distance.

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6. SYSTEM CONFIGURATIONThe system configuration example for the SWL31 Radio Series is described below.
The I/O addresses of the slave stations and extension units are closely allocated in the order ofsmaller registered station numbers.
The bit I/O leading addresses' RXm and RYm depend on the parameters of the master station.
The word I/O leading addresses' RWr and RWw depend on the parameters of the master station.
* Refer to the I/O Correspondence Table in the next page.
* For the details of the parameter setting, refer to "2.4 GHz Band Wireless unit Setting Utility(SWL31-UT1) User's Manual."

Refer to the figure below for the maximum bit points, word points, number of slave stations registered,and number of extension units registered.

Slave Station 1
2-point input
2-point output

Address
RXm0 to F
RYm0 to F

SWL31-R4ML

Extension Unit Link (RS485)[Slave Station 1]
16-bit occupation

PLC<Maximum bit number>
Input: 144 points Output: 144 points<Maximum word number>
Input: 36 points Output: 36 points<Maximum extension units>
Registration number: 8 units

2.4 GHz Band
Radio
Communication

16-point input
16-point output

Address
RX(m+1)0 to F
RY(m+1)0 to F

16-point input
16-point output

Address
RX(m+2)0 to F
RY(m+2)0 to F

[SWLEX-XY16 Station No. 1]
16-bit occupation

Ethernet(100BaseTX)MC Protocol(3E Frame,
1E Frame)

Slave Station 2
2-point
output

SWL31-R4ML

SWL31-ETMC

Pulse Count
1ch input[Slave Station 2](Pulse count effective)[Master Station]

Address
RX(m+3)0 to F
RY(m+3)0 to F

[SWLEX-XY16 Station No. 2]
16-bit occupation

RWr+4 to 5
RWw+4 to 5

AD 4-point
input[SWLEX-AD4 Station No. 3]

16-bit/2-word occupation

Four word occupation<Maximum bit number>
Input: 2048 points Output: 2048 points<Maximum word number>
Input: 256 points Output: 256 points<Maximum slave stations (relay stations
included)>
Registration number: 40 units

Slave Station 3

SWL31-R4ML

2-point input
2-point output

Address
RX(m+4)0 to F
RY(m+4)0 to F Extension Unit Link (RS485)[Slave Station 3]
SWLEX-X16

16-bit occupation

16-point input

Address
RX(m+5)0 to F

AD 4-point
input

Address
RWr+6 to 9
RWw+6 to 9

[SWLEX-X16 Station No. 1]
16-bit occupation[SWLEX-AD4 Station No. 2]
Four word occupation

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Address
RWr+0 to 3
RWw+0 to 3

I/O Correspondence Table• Slave Station 1
Slave
station/extension
unit input signal
name

PLC device
assignment(remote input)

Slave
station/extension
unit output signal
name

PLC device
assignment(remote output)

Slave Station 1

Slave Station 1

Input 16 Points/Output
16 Points Extension
Unit Station No. 1

Input 16 Points/Output
16 Points Extension
Unit Station No. 1

Input 16 Points/Output
16 Points Extension
Unit Station No. 2

Input 16 Points/Output
16 Points Extension
Unit Station No. 2

Analog Input
Extension Unit Station
No. 3

Analog Input
Extension Unit Station
No. 3

16 bits occupied by one slave
station(I/O data: 2 bits
System area: 14 bits)

16 bits occupied by one
extensionunit of input 16 points andoutput 16 points

Four words occupied by one
extensionunit of analog input 4ch• Slave Station 2
Slave
station/extension
unit input signal
name

PLC device
assignment(remote input)

Slave
station/extension
unit output signal
name

PLC device
assignment(remote input)

Slave Station 2

Slave Station 2

Pulse Count Value

Count Value Reset

Reset

Two words occupied by pulse
count 1ch input• Slave Station 3
Slave
station/extension
unit input signal
name

PLC device
assignment(remote input)

Slave
station/extension
unit output signal
name

PLC device
assignment(remote input)

Slave Station 3

Slave Station 3

Input 16 Points
Extension Unit Station
No. 1

Input 16 Points
Extension Unit Station
No. 1

Analog Input
Extension Unit Station
No. 2

Analog Input
Extension Unit Station
No. 2

11/43

16 bits occupied by one
extensionunit of input 16 points

7. INSTALLATION PROCEDURE
The following is the procedure required to install the Wireless unit.
Starting up

Installation

Check the installation environment and fix the master station, slave
stations, and extension units with screws or DIN rail mounting
attachments.
* For details, refer to "5. Wireless unit Installation Environment" and"6-1. Installation."

WiringExecute wiring for the master station, slave stations, and extension
units.
* For details, refer to "7-2. Wiring."

Common SettingWith the Setting Utility, set the selected radio frequency, group No.,
maximum number of relay stations, and number of slave stations.
* For details, refer to "2.4 GHz Band Wireless unit Setting Utility(SWL31-UT1) User's Manual."

Ethernet SettingWith the Setting Utility, set the Ethernet parameters of the masterstation.
For the PLC setting, refer to the manual of the PLC to be connected.
* For details, refer to "2.4 GHz Band Wireless unit Setting Utility(SWL31-UT1) User's Manual."

Pulse Count SettingThis process is not required if the pulse count is not used.
With the Setting Utility, set the pulse count to the parameter of theslave stations.
* For details, refer to "2.4 GHz Band Wireless unit Setting Utility(SWL31-UT1) User's Manual."

Extension Unit
Registration

This process is not required if the extension units are not used.
With the Setting Utility, register the extension units to the parametersof the slave stations.
* For details, refer to "2.4 GHz Band Wireless unit Setting Utility(SWL31-UT1) User's Manual."
Set the station number setting switch (rotary switch) of the extension
units according to the extension setting number.

Radio Unit Writing

With the Setting Utility connected to the USB connector, write theparameters of the master station and slave stations.
* For details, refer to "2.4 GHz Band Wireless unit Setting Utility(SWL31-UT1) User's Manual."

Operation Start
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7-1.

Installation

The unit can be installed to the DIN rails (35 mm (1.38 in) with the DIN rail mounting attachment or
installed with screws. (SWL31-ETMC and SWL31-R4ML can be installed with the same installation
method.)(1) Installing to the DIN rail
DIN
Mounting
Attachment
Hole
DIN Rail
rail Mounting
Attachment
Hole

DIN rail Mounting
DIN Rail Mounting
Attachment
Attachment

4-2.4×6

55

Antenna side20

Pay attention to themounting direction.

Rear ofof Unit
Rear
Unit

1)

Install the DIN rail mounting attachment to the rear of the Wireless unit with the M3 tapping screws(*1). (Screw tightening torque: 30 to 42 Ncm)

2)

Hook the claw (upper side) of the DIN rail mounting attachment to the DIN rail.

3)

Push the claw (lower side) until a clicking sound is heard.
*1: Use only the tapping screws packed together. If not, racing or damage may occur.

(2) Screwing
Mounting Hole
Processing Dimension

2-3.1(Main Body
Mounting Hole)

81±0.2

Fix the unit with two screws.

57±0.2

13/43

7-2.

Wiring

For the terminal layout and conforming electric wire size, refer to "13-9. Terminal Block
Specification."* To prevent induction noise, lay the power line and the signal line away from each other as far
as possible. (It is recommended that they are away from each other 100 mm (3.94 in) or
more.)● Wiring Master Station(1) Connect the unit power supply.
(2) Connect the FG terminal to the ground.
● Wiring Slave Station(1) Connect the unit power supply.
(2) Connect the extension link.
(3) Connect the I/O signal line.
(4) Connect the error signal line.
● Wiring Extension Unit (SWLEX-X16/SWLEX-XY16/SWLEX-AD4)(1) Connect the unit power supply.
(2) Connect the signal line.
(3) Connect the link cable to the slave station and extension unit.
* Extension unit link maximum communication distance: 1000 m (3280 ft)* For connection locations, refer to the figure below.
[Wiring Extension Unit Link]
Extension Unit 1

Extension Unit 2
*2

TERM

TERM

DG

DG (EXG)

DG (EXG)DB

DB (EXO)

DB (EXO)DADA (EXI)DA (EXI)

Slave *1
Station

RS485 cable with ashield recommended

RS485 cable with ashield recommended*1: A terminal resistor is implemented within the slave
station.

*2: Connect TERM to DB (EXO) of the extension unit connectedto the terminal to use a terminal resistor within the unit.

[Screw-less Terminal Block Connection Method]• Peel 8 mm (0.31 in) of the electric wire end as in the figure on the right.
• Insert the electric wire pressing the stopper with a screwdriver.
• Leave the screwdriver from the stopper to fix the electric wire.

14/43

8mm

8. CHECKING RADIO COMMUNICATIONS
Temporarily install the Wireless units to check the radio wave status with the Radio Wave Intensity
Display Mode.
The radio wave intensity is displayed only on the slave stations.
(Do not install them permanently when the radio wave status is not good. The installation locations
must be changed.)● Operation
Refer to "9. Parameter Operation Method for Button Setting" and press the [MODE/BACK] key
several times to enter the Radio Wave Intensity Display Mode.
Pressing the [MODE/BACK] key in the Radio Wave Intensity Display Mode enters the Normal
Mode.

MODE
BACK

▼

▲

MODE
BACK

SET

Normal Mode

▼

▲

SET

Radio Wave Intensity Display Mode

● Display"Lv *" (Received signal strength level. A numeral from 0 to 5 is displayed on *.) is displayed on thestatus monitor.
Adjust the installation location for the Received signal strength level to be three or higher at all
times as an indication of the radio wave status.
Received signal strength level
Display
Lv 5
Lv 4
Lv 3
Lv 2
Lv 1
Lv 0

Estimated radio wave condition
Strong(Recommended use level)
Medium(Usable level)
Weak(*1)(Not recommended for use)

*1:If the signal strength is low, change the installation location or add a relay station

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9. ABOUT SETTING UTILITY
Parameters of this product can be set from a PC with the Setting Utility.
For the details of the Setting Utility, refer to"2.4 GHz Band Wireless unit Setting Utility (SWL31-UT1) User's Manual"of our publication.

16/43

10. BUTTON SETTING PARAMETER LISTThe button setting parameters of this product are as follows. Check and set parameters as needed.
* Parameters of this product can also be set from a PC with the Setting Utility.
For details, refer to "2.4 GHz Band Wireless unit Setting Utility (SWL31-UT1) User's Manual."
For details of the button operation, refer to the "11. Button Operation Method" section.
● Master Station Parameters [P1**] (Host Station Radio Parameters and Host Station Ethernet Parameters)
Parameter

P101_b
P101_dP103
P107_F

DetailInformation ofsystem bit points
Information ofsystem word points
Group No.
Selectablewavenumber

Default

Variablerange

0

0 to 2048*1
0 to 256*1
0 to 151

1

0
0

P107_C1

Selected frequency

1

1 to 15

P108

Radio Output Power4

0 to 4

P109

Maximum No. of
Relay Stages

1

0 to 3*2

P110

Data Handling on
Error

2

0 to 3

P111

Radio Timeout Time 000.0

000.0 to
999.9
*4
Fixed
Fixed
Fixed
0 to 255
0 to 255
0 to 255
0 to 255

Remarks

Read/
Write

Display of bit points used by the whole system

R

Display of word points used by the wholesystemRadio communication group No.

R/W

Selectable wavenumberR

1: 2.405 GHz, 2: 2.410 GHz, 3: 2.415 GHz
4: 2.420 GHz, 5: 2.425 GHz, 6: 2.430 GHz
7: 2.435 GHz, 8: 2.440 GHz, 9: 2.445 GHz
10: 2.450 GHz, 11: 2.455 GHz, 12: 2.460 GHz
13: 2.465 GHz, 14: 2.470 GHz, 15: 2.475 GHz
0: 0.6 mW (-2 dBm), 1: 1.6 mW (2 dBm)
2: 2.5 mW (4 dBm), 3: 4.0 mW (6 dBm)
4: 6.3 mW (8 dBm)
0: No relay, 1: 1-stage relay
2: 2-stage relay, 3: 3-stage relay
0: Clear *3, 1: Hold
2: Bit clear/word hold *3
3: Word clear/bit hold *3Time from radio transmission toradio timeout error generation
Example: 10 sec. for 10.0 set
MAC Address

R

R/W

R/W
R/W
R/W

R/W

P121_Ad12****R
P121_Ad34 MAC Address****R**:** : **:** : **:**
Ad12
Ad34
AD56
P121_Ad56****
R
P122_iP1
192
IP Address
R/W
P122_iP2 Host Station IP
168
192 : 168 : 10 : 2 (Default value)
R/W
P122_iP3 Address
10
iP1 iP2 iP3 iP4R/W
P122_iP42
R/W
Host Station TCP
P122_Pt
C000 0000 to FFFF Host Station TCP Port No.
R/W
Port No.
P123_Sb1
255
128 to 255 Subnet Mask
R/W
P123_Sb2
255
0 to 255 255 : 255 : 255 : 0
R/W
Subnet Mask
P123_Sb3
255
0 to 255 Sb1 Sb2 Sb3 Sb4
R/W
P123_Sb4
0
0 to 254
R/W
P198
Radio Test Mode00 to 1
0: Invalid, 1: Valid *5
R/W
P199
Software Version
v*.**
Fixed
―
R
*1: The total of [P201_b to P240_b] and [P201_d to P240_d] is automatically calculated and displayed.
*2: When 21 slave stations are registered for one master station, [1] or more shall be set. For the starcommunication (no relay), up to 1:20 communications are available.
*3: If the power of the master station is off or the LAN cable is disconnected, the data will not be cleared.
*4: When 000.0 is set, the timeout time is automatically calculated.
*5: This shall be set to Valid when the radio wave intensity is checked only with the Wireless units without the
Ethernet communications. If the Radio Test Mode is valid, the radio communications will be executed
regardless of the Ethernet communications.

17/43

● Master Station Parameters [P2**] and [P3**] (Slave Station Registration Parameters)
Parameter

P201_id1
P201_id2
P201_id3
P201_id4
P201_b
P201_dP201_C
P201_r
P201_rT
P202_id1
P202_id2
P202_id3
P202_id4
P202_bP202_dP202_C
P202_r
P202_rTP240_id1
P240_id2
P240_id3
P240_id4

DetailSlave Station 1
Unit ID
Slave Station 1 Bit
PointsSlave Station 1
Word Points
Slave Station 1
Relay Setting
Slave Station 1
Reserve Setting
For Manufacturer
Setting
Slave Station 2
Unit ID
Slave Station 2 Bit
PointsSlave Station 2
Word Points
Slave Station 2
Relay Setting
Slave Station 2
Reserve Setting
For Manufacturer
Setting
Slave Station 40
Unit ID

Default

0000
0000
0000
0000
0
0

Variable
range

Remarks

0000 to FFFF
0000 to FFFF Slave Station 1 unit ID****:****:****:****
0000 to FFFF id1 id2 id3 id40000 to FFFF
Slave Station 1 bit points (extension units
0 to 144 *1
included)
Slave Station 1 word points (extension units
0 to 36 *2
included)

Read/
Write

R/W
R/W
R/W
R/W
R/W
R/W

0

0 to 1

0: Normal station, 1: Relay-dedicated station

R/W

0

0 to 1

0: Used station, 1: Reserved station

R/W

1

0 to 5For Manufacturer Setting

R/W

0000
0000
0000
0000
0
0

0000 to FFFF
0000 to FFFF Slave Station 2 unit ID****:****:****:****
0000 to FFFF id1 id2 id3 id40000 to FFFF
Slave Station 2 bit points (extension units
0 to 144 *1
included)
Slave Station 2 word points (extension units
0 to 36 *2
included)

R/W
R/W
R/W
R/W
R/W
R/W

0

0 to 1

0: Normal station, 1: Relay-dedicated station

R/W

0

0 to 1

0: Used station, 1: Reserved station

R/W

1

0 to 5For Manufacturer Setting

R/W

0000
0000
0000
0000

0000 to FFFF
0000 to FFFF Slave Station 40 unit ID****:****:****:****
0000 to FFFF id1 id2 id3 id40000 to FFFF
Slave Station 40 bit points (extension units
0 to 144 *1
included)
Slave Station 40 word points (extension units
0 to 36 *2
included)

R/W
R/W
R/W
R/W

Slave Station 40 Bit
0R/W
PointsSlave Station 40
P240_d0
R/W
Word Points
Slave Station 40
P240_C0
0 to 1
0: Normal station, 1: Relay-dedicated station
R/W
Relay Setting
Slave Station 40
P240_r0
0 to 1
0: Used station, 1: Reserved station
R/W
Reserve Setting
For Manufacturer
P240_rT
1
0 to 5For Manufacturer Setting
R/W
Setting
Points LockP398
00 to 1
0: Locked, 1: Lock released
R/W*3
No. of Slave
P399
Stations Registered0
0 to 40
Display of No. of slave stations registeredR*4*1: The bit points change for every 16 points.
*2: The word points change for every 2 points.
*3: When multiple slave stations are registered, to prevent address assignment change, the bit points [P2**_b]and the word points [P2**_d] cannot be changed for other than the last station number. Changing thevalue of [P398] to 1 releases the lock.
*4: It is automatically displayed from the status of [P201_b to P240_b]. (The value 0 is assumed to be
unregistered.)
The number of reservation registered stations includes reserved stations.
P240_b18/43

● Master Station Parameters [P4**] (Communication Destination Ethernet Parameters)
Parameter

P401_iP1
P401_iP2
P401_iP3
P401_iP4
P401_Pt
P402
P403

DetailPartner Station
IP Address

Default

Variable
range

192
168
10
3
C100
00
FF

0 to 255
0 to 255
0 to 255
0 to 255
0 to FFFF
00 to FF
00 to FF

Remarks

IP Address of Ethernet partner
192 : 168 : 10 : 3 (Default value)
iP1 iP2 iP3 iP4

Read/
Write

R/W
R/W
R/W
R/W
R/W
R/W
R/W

Port Number
Partner's TCP/IP port number (Hexadecimal)
Network Number*1 (Hexadecimal)
PC Number*1 (Hexadecimal)
Request Destination
P404
3FF 0000 to FFFF *1 (Hexadecimal)
R/W
I/O Station No.
Request Destination
P405
00
00 to FF *1 (Hexadecimal)
R/W
Unit Station No.
CPU Monitoring
P406
16
0 to 3600 *1 (Decimal)
R/W
Timer
Bit Input
P407_dv
00, 10
0: X, 10: D *2,*3
R/W
Device Type
0000 to 1FFF For X device (Hexadecimal)
Bit Input
P407_st
1000
R/W
Start Number
0000 to 9255 For D device (Decimal)
Bit Output
P408_dv
00,10
0: Y, 10: D *2,*3
R/W
Device Type
0000 to 1FFF For X device (Hexadecimal)
Bit Output
P408_st
1000
R/W
Start Number
0000 to 9255 For D device (Decimal)
Word Input
P409_dv
10
10
10: D
R/W
Device Type
Word Input
P409_st300 0000 to 8000 Device start number (Decimal)
R/W
Start Number
Word Output
P410_dv
10
10
10: D
R/W
Device Type
Word Output
P410_st600 0000 to 8000 Device start number (Decimal)
R/W
Start Number
Ethernet Timeout
P411
0100 0100 to 9999 Setting of Ethernet reception waiting time [ms] *4 R/W
Time
0: MC protocol 3E frame (Q Series)
P412
Ethernet Protocol
00 to 1R/W
1: MC protocol 1E frame (FX Series)*1: P402 to P405 are MC protocol-related parameters. If communications are unavailable with the default
setting, refer to "MELSEC-Q/L MELSEC Communication Protocol Reference Manual" and "Model:
MC-PROTOCOL-R," manuals by Mitsubishi Electric, and check the details.
*2: If you use the PLC of Q Series or FX Series, "X device" or "D device" shall be selected respectively.
*3: If P412 is set to 0, D device cannot be selected.
*4: If communications are unavailable with the Ethernet partner even after Ethernet timeout time [ms] x 3
passes, the error code "EG" will be generated.

● Master Station Parameter Reset Setting [Pr**]
Parameter

Pr01
Pr02
Pr04
Pr0E
Pr99

Detail

[P1**] ParameterReset[P2**] ParameterReset[P4**] ParameterReset[PE**] Error History
Reset
All Parameters
Reset

Default

Variablerange

0

0 to 10

0 to 10

0 to 10

0 to 10

0 to 1

Remarks

0: Invalid
1: [P1**] is set back to the default.
0: Invalid
1: [P2**] is set back to the default.
0: Invalid
1: [P4**] is set back to the default.
0: Invalid
1: The error history [PE**] is cleared.
0: Invalid
1: All parameters and error history are set
back to the default.

19/43

Read/
Write

R/W
R/W
R/W
R/W
R/W

● Slave Station Parameters [P1**] (Host Station Radio Parameters)
Parameter

P101_b
P101_dDetailInformation of Bit
PointsInformation of Word
PointsP102_id1
P102_id2

Default

160

Variablerange

16 to 144
*1
0 to 36
*2

****

Fixed

****

Fixed

R

Word points (extension units included)R****:****:****:****

****

Fixed

P102_id4

****

Fixed

0

0 to 15

1

1

P107_FBit points (extension units included)

Unit ID

P102_id3

Group No.
Selectablewavenumber

id1 id2 id3 id4Radio communication group No.
Selectable wavenumber

P107_C1

Selected frequency

1

1 to 15

P108

Radio Output Power4

0 to 41

0 to 3*30

0 to 1

0: Clear, 1: Hold

000.0 to999.9
*4Time from radio transmission to radio timeout
error generation
Example: 10 sec. for 10.0 set
0: LIVE signal, 1: a contact signal
2: b contact signal
0: Normal station, 1: Relay-dedicated station

P110
P111
P112
P113
P131
P132_ PL1
P132_ PL2

Maximum No. of
Relay Stages
Data Handling on
Error

Radio Timeout Time 000.0
Error Terminal
OutputRelay-dedicatedStation Setting
Pulse Count Valid
Setting
Pulse Count Digit
No. Setting

2

0 to 200 to 10

0 to 28

1 to 80: Pulse count function invalid
1: Pulse count function (ch1) valid
2: Pulse count function (ch1, ch2) valid
Pulse count ch1 digit No. Setting

1 to 8

Pulse count ch2 digit No. Setting

8

R
R
R

1: 2.405 GHz, 2: 2.410 GHz, 3: 2.415 GHz
4: 2.420 GHz, 5: 2.425 GHz, 6: 2.430 GHz
7: 2.435 GHz, 8: 2.440 GHz, 9: 2.445 GHz
10: 2.450 GHz, 11: 2.455 GHz, 12: 2.460 GHz
13: 2.465 GHz, 14: 2.470 GHz, 15: 2.475 GHz
0: 0.6 mW (-2 dBm), 1: 1.6 mW (2 dBm)
2: 2.5 mW (4 dBm), 3: 4.0 mW (6 dBm)
4: 6.3 mW (8 dBm)
0: No relay, 1: 1-stage relay
2: 2-stage relay, 3: 3-stage relay

P109

Read/
Write

R

Unit ID

P103

Remarks

R/W
R

R/W

R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W

P199
Software Version
v*.**
Fixed
―
R
*1: It is automatically calculated and displayed from the number of I/O extension units registered of the hoststation (16 points) + extension units registered [P501_Un to P508_Un].
*2: It is automatically calculated and displayed from the number of analog input extension units registered of
the host station (2 points/number of pulse count channels [P131]) + extension units registered [P501_Un
to P508_Un].
*3: When 21 slave stations are registered for one master station, [1] or more shall be set. For the starcommunication (no relay), up to 1:20 communications are available.
*4: When 000.0 is set, the timeout time is automatically calculated. A value with a margin shall be set so thatan error is not generated in a normal status.

20/43

● Slave Station Parameters [P5**] (Extension Unit Parameters)
Parameter

P501_Un
P501_r
P501_oP501_ch1
P501_ch2
P501_ch3
P501_ch4
P508_UnP508_rP508_oP508_ch1
P508_ch2
P508_ch3
P508_ch4
P510

Default

Variablerange

0

0 to 1, 11

0

0 to 1

0: Used station, 1: Reserved station

R/W

Data Handling on
Extension 1 Error

2

0 to 2

0: Clear, 1: Hold
2: Adjusted to slave station [P110] setting

R/W

Extension 1 Analog
Channel Setting

―
―
―
―

―
―
―
―

Refer to the analog input parameter [P5**_ch*].

―
―
―
―

0

0 to 1, 11

0

0 to 1

0: Used station, 1: Reserved station

R/W

2

0 to 2

0: Clear, 1: Hold
2: Adjusted to slave station [P110] setting

R/W

Extension 8 Analog
Channel Setting

―
―
―
―

―
―
―
―

Refer to the analog input parameter [P5**_ch*].

―
―
―
―

No. of Extension
Units Registered0

0 to 8The number of extension units registered toP501 to P508 is automatically calculated.

R

DetailExtension 1 Unit
Registration
Extension 1
Reserve Setting

Extension 8 Unit
Registration
Extension 8
Reserve Setting
Data Handling on
Extension 8 Error

Remarks

Read/
Write

0: Unregistered, 1: I/O extension unit registered
R/W
11: Analog input extension unit registered

0: Unregistered, 1: I/O extension unit registered
R/W
11: Analog input extension unit registered● Analog Input Parameters [P5**_ch*] (Analog Input Parameters)
Parameter

DetailDefault

Variablerange

US

AD Conversion
Permission

0

0 to 1rA

Input Range0

0 to 4

Av

Sampling/
Average Setting

0

0 to 3Ti

AverageCount/Time
Setting0

0 to 32

Remarks

AD conversion permission for each channel
0: Not permitted, 1: Permitted
Input range setting
0: 0 V to 10 V, 1: 0 to 5 V, 2: 1 to 5 V
3: 0 to 20 mA, 4: 4 to 20 mA
Sampling/average processing setting
0: Sampling processing
1: Count average processing
2: Time average processing
3: Transfer average processing
Count average/transfer average: 0 to 32 times
Time average: 0 to 32 x 10 ms(Invalid for sampling processing)

21/43

Read/
Write

R/W
R/W

R/W

R/W

● Slave Station Parameter Reset Setting [Pr**]
Parameter

Pr01
Pr05
Pr0E
Pr99

Detail

[P1**] ParameterReset[P5**] ParameterReset[PE**] Error History
Reset
All Parameters
Reset

Default

Variablerange

0

0 to 10

0 to 10

0 to 10

0 to 1

Remarks

0: Invalid
1: [P1**] is set back to the default.
0: Invalid
1: [P5**] is set back to the default.
0: Invalid
1: The error history [PE**] is cleared.
0: Invalid
1: All parameters and error history are set
back to the default.

22/43

Read/
Write

R/W
R/W
R/W
R/W

11. BUTTON OPERATION METHOD● Parameter Group Display Change(1) For Master Station
Every time the [MODE/BACK] key is pressed, the parameter group changes as follows.
*2

Normal Mode *1

BACK
MODE

Radio Wave
Intensity
Display

Error History
Display

BACK
MODE

BACK
MODE

Parameter
Display

BACK
MODE

BACK
MODE

Parameter
Display

Parameter
Display

BACK
MODE

BACK
MODE

Parameter Reset
Setting*1: Normal Mode in starting-up The current frequency
CH or error code is displayed.
*2: Displays within the frameof a broken line areskipped in the Parameter Setting Mode (sevensegment blinking).

(2) For Slave Station
Every time the [MODE/BACK] key is pressed, the parameter group changes as follows.
*2

Normal Mode *1

BACK
MODE

Radio Wave
Intensity Display

*4
BACK
MODE

Pulse Count Display

*3
BACK
MODE

Pulse Count Display

BACK
MODE

BACK
MODE

Parameter Display

Error History
Display

BACK
MODE

BACK
MODE

Parameter Display

BACK
MODE

Parameter Reset
Setting*1: Normal Mode in starting-up The current frequency CH or
error code is displayed.
*2: Displays within the frameof a broken line areskipped in the Parameter Setting Mode (seven segment
blinking).
*3: It is displayed when [P131] is set to "1" or "2".
*4: It is displayed when [P131] is set to "2".

23/43

● About Parameter Change
If the [SET] key is pressed for two sec. or the forth digit of 4-digit parameter is determined with the[SET] key while the parameter value of the parameter number to be changed is displayed, theparameter value display will be changed from lighting to blinking and the mode will be switched to
the Parameter Setting Mode.
* Pressing the [MODE/BACK] key for two sec. enables the changed parameter. If other parameters
are to be changed successively, switch the parameter number, change the parameter value, andfinally press the [MODE/BACK] key for two seconds.

! ! ! Caution ! ! !
Do not turn off the power of the radio unit in the Parameter Setting Mode.
Otherwise, all the changed parameters will be invalid and the setting willchange back to the parameter values before changing.

● Parameter Value Change (1) (Single Parameter)
Single parameters (without sub-parameters) can be changed with the operation below.

* Master station
operation example▼*1: The seven segment display blinks and the Parameter Setting
Mode is activated.
*2: Press for a short time in the Parameter Setting Mode (sevensegment blinking).

▲

SET *1

Change the value.
SET SET SET

▼

▲
SET
Press for Blink Blink Blink Blink
two sec.
*2

Change the value of the blinking digit with.

Blink Blink Blink

▼

▲

SET

Cancel
BACK
MODE

BACK
MODE

*3

▼

▲

▼
SET

*4

▲

SET

Press fortwo sec.

BACK
MODE

BACK
MODE

BACK
MODE

*3: The seven segment display blinks and the Parameter
Setting Mode is activated.
*4: The parameter value can be changed with the↑↓ buttons in the Parameter Setting Mode (sevensegment blinking).

BACK
MODE

Pressing the [MODE/BACK] key for two sec. determines the parameter value and the Normal Mode is restored. (*1, *3, *4)

24/43

● Parameter Value Change (2) (With Sub-parameter)
Parameters (with sub-parameters) values can be changed with the operation below.
* Master station
operation example*1: The seven segment display blinks and theParameter Setting Mode is activated.
*2: Press for a short time in the Parameter Setting
Mode (seven segment blinking).
SET*1

Change the value.

▲

▼

SET

Press fortwo sec.
*2

SET

BACK
MODE

Blink Blink Blink Blink
Change the valueof the blinking digit
with.
Blink Blink Blink▲▼SET SET SET

Cancel
BACK
MODE

▲

▼

BACK
MODE

BACK
MODE

BACK
MODE

▲

▼
SET

*3
BACK
MODE

▲

▼

▲

▼

▲

▼

*4

SET

SET

Press fortwo sec.

BACK
MODE

*3: The seven segment display blinks and theParameter Setting Mode is activated.
*4: The parameter value can be changed with the↑↓ buttons in the Parameter Setting Mode(seven segment blinking).
Pressing the [MODE/BACK] key for two sec. determines the parameter value and the Normal Mode is restored. (*1, *3, *4)● Error History Display
The error history of the past ten cases can be checked with the operation below.
SET

Old

When no error history exists the display will be
as shown on the left

History

BACK
MODE

▼

▲

▼

▲
SET

Error CodeDisplay

When the time has not beenobtained (common forMonth/Day and Hour/Min)

BACK
MODE

▼

▲
SET

Time Display(Month/Day)*1

Error CodeDisplay

SET

SET

New
BACK
MODE

The latest error is displayed after "PE01".

Time Display(Hour/Min)
*1

BACK
MODE

BACK
MODE

*1: The time setting with the PLC is required for thetime display.

25/43

● Pulse Count Value Display
The pulse count value can be checked with the operation below.
(The value is displayed for [P131] = 1 or 2)● Pulse Count Default Setting
When a value other than 0 is to be set (when the value is adjusted to the meter value or other cases),
the following procedure shall be
used.

Example: For Count Value when setting Six Digits
SET

SET

Determined
SETCount Value
Upper Four
Digits Display

Press for two
sec.

Determined
SET

SET

Count Value
Lower Four
Digits Display

Blink Blink

Press fortwo sec.

SET

SET

SET

Blink Blink Blink Blink

Change the value of theblinking digit with

Change the value of the.

blinking digit with

Blink

Blink Blink Blink

CancelCancel
BACK
MODE

BACK
MODE

BACK
MODE

SET

26/43

BACK
MODE

BACK
MODE

BACK
MODE

.

12. ERROR CODE LIST
● Error Code of Master Station
Display[EL ]Error name
EthernetCommunication
Error

[EG ]

[E1.**]

Radio
Communication"**" is the Timeout Error
stationno. of thetargetslave
station.

Error detail
Communication
with an Ethernet
partner isunavailable evenafter a certain time
passes.

Communication
with a slave stationis unavailable evenafter a certain time
passes.

Handling method
Check the items below.
• Is the power of the partner unit on?
• Is an Ethernet cable connected?
Check the items below.
• Is the Ethernet setting of the partner unit
consistent with the Ethernet setting of the masterstation?
• Is an Ethernet cable connected from "HUB to thepartner unit" when the HUB relays between thepartner unit and master station?
Check the items below.
• Is the frequency consistent with the slave station?
• Is the group no. consistent with the slave station?
• Is the unit ID setting correct?
⇒ Write the setting to the master station and slave
station using the same setting data in the Setting
Utility (SWL31-UT1).
• Is the power of the slave station on?
• Are other Wireless units using the same
frequency within the same area?

27/43

● Error Code of Slave Station
Display[E1 ]Error nameRadio
Communication
Timeout Error

Error detail
Communication
with a masterstation isunavailable evenafter a certain time
passes.

[E5 ]Inconsistent
Points Error

The points of theslave station andmaster station areinconsistent.

[EL.**]

Extension Unit
Communication
Error

Communication
with an extension
unit is unavailable
even after a certain
time passes.

"**" is thestationno. of thetargetextension
unit.

Handling method
Check the items below.
• Is the frequency consistent with the masterstation?
• Is the group no. consistent with the masterstation?
• Is the unit ID setting of the master station correct?
⇒ Write the setting to the master station and slave
station using the same setting data in the Setting
Utility (SWL31-UT1).
• Is the power of the master station on?
• Are other Wireless units using the same
frequency within the same area?
Check the items below.
• Is the points setting consistent with the masterstation?
⇒ Write the setting to the master station and slave
station using the same setting data in the Setting
Utility (SWL31-UT1).
Check the items below.
• Is the extension unit registered to the slave
station?
• Is the extension unit type correct?
⇒ Check the extension unit setting of the slave
station using the Setting Utility (SWL31-UT1).
• Is the power supplied to the extension unit?
• Is the extension link wiring correct?
• Is the setting of the extension unit station no.
(rotary switch) correct?

28/43

13. SPECIFICATIONS
13-1. General Specifications
Item
Target Unit
Operating Ambient
Temperature
Operating Ambient
Humidity
Storage Ambient
Temperature
Storage Ambient
Humidity
Rated operational
Voltage
Current Consumption
Rated Power
Noise ResistanceVibration Resistance
Shock ResistanceOperating Atmosphere
WeightSpecifications
SWL31-ETMC (Master Station)
SWL31-R4ML (Slave Station)
0 to +55 degrees C
5 to 95%RH (No condensation)-10 to +65 degrees C
5 to 95%RH (No condensation)
12/24 V DC (10.2 to 26.4 V DC)
60 mA or lower (For 24 V DC)
55 mA or lower (For 24 V DC)
1.5 W
1.4 W
Noise voltage: 500 Vp-p, Noise width: 1 μs
by a noise simulator with noise frequency of 45 Hz
Frequency: 10 to 150 Hz
Acceleration: 9.8 m/s2
No. of sweeps: Ten times each in X, Y and Z direction
Acceleration: 147 m/s2
No. of shocks: Three times each in X, Y and Z direction
No dust or corrosive gas *1
Approx. 130 g (with a pencil type antenna equipped)*1: The special corrosion proof coating cannot be supported since the radio characteristics
change.

29/43

13-2. Communication Specifications(1) Radio Communication
Item
Target Unit
Communication Method
Communication Topology
Maximum No. of Relay
Units
Operation Usage
Frequency Band
No. of Frequency
Channels
Antenna Power
Communication Speed
Communication distance*1
Response Time *1

Specifications
SWL31-ETMC (Master Station) and SWL31-R4ML (Slave Station)
Polling system
Mesh *2
3 units *3
ISM 2.4 GHz frequency band
2.405 GHz to 2.475 GHz (5.0 MHz interval)
15 ch

6.3 mW or lower
250 kbps
Indoors: Maximum. 60 m(197 ft)(prospect),
Outdoors: Maximum. 300 m(984 ft) (prospect)• For one slave station: Approx. 50 ms + 150 ms• For n units of slave station: Approx. 50 ms x n units + 150 ms*1: The values are ones obtained when no relay unit exists. Also, they depend on
surrounding environments such as obstacles.
*2: For the overview of Mesh, refer to "13-3. About Mesh Communication."*3: For the overview of the Maximum No. of Relay Units, refer to "13-4. About
Maximum No. of Relay Units."(2) Ethernet Communication
Item
Target Unit
Interface
Maximum Bit Number
Maximum Word Number
Max No. of Slave Stations
Connected

Specifications
SWL31-ETMC (Master Station)
Ethernet (100BASE-TX, TCP/IP, and others, Connector: RJ-45)
MC Protocol (3E frame client)
MC Protocol (1E frame client)
Input 2048 points, Output 2048 points (system area included)
Input 256 points, Output 256 points
40 units (depends on the no. of extension units connected)(3) RS485 Communication
Item
Target Unit
Max No. of Extension Units
Connected
InterfaceCommunication
Extension Speed
Link
Maximum
Communication
Distance

Specifications
SWL31-R4ML (Slave Station)
8 units
RS-48576.8 kbps
1000 m(3280 ft)

30/43

13-3. Mesh Communication
The optimum route between the master station and each slave station is automatically detected onstarting-up. The setting is easy since the relay setting is not required.
Even if a part of a route is disconnected, an alternative route is automatically searched for; therefore a
network with high reliability can be established.
Radio environment changes
Obstacles which block
off radio waves

PLC

SWL90-ETMC

MasterStation

SWL90-R4ML

SWL90-R4ML

Slave
Station 1

Slave
Station 3

SWL90-R4ML

Slave
Station 4

SWL90-R4ML

Slave
Station 2

Automatically searches for an alternative route
Obstacles whichblock off radio waves

PLC

SWL90-ETMC

MasterStation

SWL90-R4ML

SWL90-R4ML

Slave
Station 1

Slave
Station 3

SWL90-R4ML

Slave
Station 4

SWL90-R4ML

Slave
Station 2• Notes on Mesh Communication
If the radio communication environment is unstable and the radio communication fails
continuously, the input/output signal communication may be unavailable for a certain time (oneminute or longer) due to a route search. The system shall be established so that even when
the communication is unavailable, the units operate on the safe side.
31/43

13-4. The Maximum Number of Relay Units
The maximum number of units which can relay communications between the master station and theterminal slave station is defined as the maximum number of relay units.
"Configuration Example"
PLC

SWL90-R4ML

SWL90-R4ML

Slave
Station 1

SWL90-R4ML

Slave
Station 2

Slave
Station 3

SWL90-R4ML

Slave
Station 4

SWL90-ETMC

MasterStation

SWL90-R4ML

SWL90-R4ML

SWL90-R4ML

Slave
Station 5

Slave
Station 6

Slave
Station 7

Relay 1

Relay 2

Relay 3

SWL90-R4ML

Slave
Station 8

Maximum No. of Relay Units: 3

13-5. Slave Station Interface Specifications
Item
Target Unit
Number of Bits Occupied(Only Slave Station)
Number of Words Occupied(Only Slave Station)
Max No. of Bits Occupied(Extension Units Included)
Max No. of Words
Occupied (Extension Units
Included)Specifications
SWL31-R4ML (Slave Station)
Input: 16 bits/per unit
Output: 16 bits/per unit
Input: Max four words/per unit *1
Output: Max four words/per unit *1
Input: 144 points (system area included)
Output: 144 points (system area included)
Input: 36 points
Output: 36 points

Input 2 points/Output 2 points + Error output 1 point(Input 2 points can be switched to the pulse count 2ch/1ch.)
Maximum two channels available
0 to 99999999
Pulse Count Function
8 digits(Memory retention available at power failure)( A ring counter)*1: Words are occupied when the pulse count function is used. (Two word occupation per
channel)I/O Interface

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13-6. Input Specifications
Item

Specifications

Target Unit

SWL31-R4ML (Slave Station)

Input Type
Input Points

DC input (a plus common/minus common shared type)2 points

Insulation Method
Rated Input Voltage

Photocoupler insulation
12/24 V DC (+10/-15%, Ripple rate 5% or less)

Rated Input Current
ON Voltage/ON Current

Approx. 3 mA for 12 V DC, Approx. 7 mA for 24 V DC
8 V or higher/2 mA or higher

OFF Voltage/OFF Current

4 V or lower/1 mA or lower

Input Resistance
OFF→ON
Response Time
ON→OFF
Common TypeOperation Display

Approx. 3.3 kΩ
200 ms or less (One master and One slave station
communication: no relay)
200 ms or less (One master and One slave station
communication: no relay)
2 points per common
ON display (LED)

External Connection Diagram
R
R
X1

+

-

-

+

COM

12/24 V DC

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Internal
circuitX0

13-7. Output Specifications
Item
Target Unit
Output Type
Output Points
Insulation Method

Specifications
SWL31-R4ML (Slave Station)
Transistor output (sync type)
3 points (error output signal 1 point included)
Photocoupler insulation

Rated Load Voltage

12/24 V DC (+10/-15%)
0.1 A/1 point, 0.3 A/1 common(error output signal 1 point included)

Maximum Load Current
OFF→ON

Response Time
ON→OFF

Surge Killer
Fuse
External Power Voltage
SupplyCurrent
Common Type

200 ms or less (One master and One slave station
communication: no relay)
200 ms or less (One master and One slave station
communication: no relay)
Zener diodeNone
12/24 V DC (+10/-15%) (Ripple rate 5% or less)
10 mA (for 24 V DC)
3 points per common (error output signal 1 point included)Internal
circuit

External Connection Diagram

Y0

L

R
Y1
ERR

L
L

+
COM12/24 V DC

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13-8. Pulse Count Specifications(1) Pulse Count Input Basic Specifications
Item
Specifications
Number of Channels
2ch/1ch * Selectable with the parameter
Input Voltage Specifications 12/24 V DC
Minimum Input Pulse Width 30 Hz (ON: 16.7 ms, OFF: 16.7 ms)* When the machine contact output is used, the chattering timeshall be considered.
Counter Type
Ring counter type
Number of Digits
1 to 8 digits
Default Setting
The count value can be set with other than 0 with the operation
buttons of the slave station.
Reset
External
Turning on the input terminal (X1) of the slave station resets the count.
MethodReset* When 2ch is used, the external reset is unavailable.
Commanding internal reset from the sequence program to theInternal Resetmaster station resets the count.
Note: If the pulse count is used the master station parameter for the word data of the PLC shall be
set to Hold not to be cleared (to zero) at radio error.
(2) Terminal Layout Specifications of Pulse Count Input
List of Functions and Corresponding Addresses Based on Terminal Names
1) When one channel is used
Terminal name
Function
Corresponding address *1
X0
Pulse input ch1
RWr+0 to 1
X1
Pulse count value ch1 external reset *2
RWr+0 to 1
2) When two channels are used
Terminal name
Function
X0
Pulse input ch1
X1
Pulse input ch2 *2

Corresponding address *1
RWr+0 to 1
RWr+2 to 3

*1: For the case where the leading address of the remote register (input) assigned to the slave
station is RWr*2: If a signal is input to X1, the external reset control will operate to set 0 to the counter value.
(3) Address Assignment Specifications of Pulse Count Input
List of Functions and Corresponding Terminal Names Based on Addresses
1) When one channel is used
Address *3
Function
Corresponding terminal name
X0 (pulse input)
RWr+0 to 1
Pulse count value ch1 monitoring
X1 (external reset)
Pulse count value ch1 internal reset control *4―
RWw+0 to 1
Vacant―2) When two channels are used
Address *3
Function
RWr+0 to 1
Pulse count value ch1 monitoring
RWr+2 to 3
Pulse count value ch2 monitoring
RWw+0
Pulse count value ch1 internal reset control *4
RWw+1
Vacant
RWw+2
Pulse count value ch2 internal reset control *4
RWw+3
VacantCorresponding terminal nameX0 (ch1 pulse input)
X1 (ch2 pulse input)――――*3: For the case where the leading address of the remote register (input) assigned to the slave
station is RWr. For the case where the leading address of the remote register (output) assigned
to the slave station is RWw.
*4: If values other than 0 are set, the internal reset control will operate to set 0 to the counter value.
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13-9. Terminal Block Specifications● Master Station (SWL31-ETMC)[Terminal Block Diagram][Terminal Layout]
Item
Unit Power Supply +Unit Power Supply FG Terminal

123

Terminal no. Silk notation
Specifications
1+
Unit power supply (12 to 24 V DC)
2
3
FG
FG connection terminal[Terminal Specifications]
Item
Conforming Electric Wire
Size
Standard Peeling Length
Recommended
Conforming Tool

Specifications
Single wire: φ0.8 mm(0.03 in) (AWG20),
twisted wire 0.5 mm2 (AWG20),
strand diameter φ0.18 mm(0.007 in) or more
8 mm(0.31 in)Flathead screwdriver
Shaft diameter φ3 mm(0.11 in),cutting edge width 2.6 mm(0.1 in)● Slave Station (SWL31-R4ML)[Terminal Block Diagram]

1 2 3 4 5 6 7 8 9 10 11 12 13[Terminal Layout]
Item
Terminal no. Silk notation
Unit Power Supply +1+
Unit Power Supply 2
Extension Unit Link DG
3
DG
Extension Unit Link DB
4
DB
Extension Unit Link DA
5DA
Input Signal X0
6
X0
Input Signal X1
7
X1
Input Signal Common COM
8COM
Output Signal Y0
9Y0
Output Signal Y1
10
Y1
Error Output Signal
11
ERR
Gate Power Supply +12+
Output Signal Common COM
13
COM-

Specifications
Unit power supply (12 to 24 V DC)
Extension link communication(RS485)
Refer to 13-6. Input Specifications.

Refer to 13-7. Output Specifications.

[Terminal Specifications]
Item
Conforming Electric Wire
Size
Standard Peeling Length
Recommended
Conforming Tool

Specifications
Single wire: φ0.8 mm(0.03 in) (AWG20),
twisted wire 0.5 mm2 (AWG20),
strand diameter φ0.18 mm(0.007 in) or more
8 mm(0.31 in)Flathead screwdriver
Shaft diameter φ3 mm(0.11 in),cutting edge width 2.6 mm(0.1 in)
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13-10.

Appearance Specifications● Master Station (SWL31-ETMC)52

SWL31-ETMC

81
89

85

4

57
35

65

35
Unit [mm]● Slave Station (SWL31-R4ML)

52

SWL31-R4ML

81
89

85

4

57
35

29

65

Unit [mm]37/43

14. AUTHENTICATION STANDARDS
Available countries
Japan
China
TaiwanThailand
Vietnam
USA

CanadaAustralia
new ZealandWireless certification standard
ARIB STD-33/T66
― *
NCC
NBTC
MIC
FCC part 15B
FCC Part 15C
FCC IDICES 003
RSS 210IC ID
AS/NZS 4268
AS/NZS 4268

* Not subject to CCC certification, SRRC certification not required

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15. FUNCTIONS REALIZED WITH SYSTEM AREA
● Functions which to be enabled using the system area
1. The PLC can detect radio communication timeout errors of each slave station.
2. The PLC can detect communication errors of each extension unit.
They are explained based on the following configuration example, address assignment andsituation example.
● Configuration Example

PLC

I/O 2 points
Input/output

Address
RXm0 to F
RYm0 to F

SWL31-R4ML

Extension Unit Link (RS485)[Slave Station 1]
16-bit occupation
I/O 16 points
Input/output

Address
RX(m+1)0 to F
RY(m+1)0 to F

I/O 16 points
Input/output

Address
RX(m+2)0 to F
RY(m+2)0 to F

[SWLEX-XY16 Station No. 1]
16-bit occupation

SWL31-[SWLEX-XY16 Station No. 2]
16-bit occupation[Master Station]
RXm, RYm: Values that depend on the parametersof the master station

SWL31-R4ML

I/O 2 points
Input/output[Slave Station 2]
16-bit occupation

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Address
RX(m+3)0 to F
RY(m+3)0 to F

● Address Assignment

Extension 6
Communication Error
Flag

Extension 7
Communication Error
Flag

Extension 8
Communication Error
Flag

5

Extension 5
Communication Error
Flag

4

Extension 4
Communication Error
Flag

3

Extension 3
Communication Error
Flag

2

Extension 2
Communication Error
Flag

1

Extension 1
Communication Error
Flag *30

System Area

Slave Station 1
Communication Error
Flag *2

Slave
Station 1
Input Data

Slave Station 1 Onetime Communication
Failure *1

RXm0 to F

6

7

8

9

A

B

C

D

E

F

*2

RYm0 to F
Slave
Station 1
Output
Data
3

4

5

6

7

8

9

A

B

C

D

E

F

Extension 1
Communication Error
Flag

2

Slave Station 2
Communication Error
Flag

1

Slave Station 2 Onetime Communication
Failure0

System Area

6

7

8

5

Extension 8
Communication Error
Flag

4

Extension 7
Communication Error
Flag

3

Extension 6
Communication Error
Flag

2

Extension 5
Communication Error
Flag

1

Extension 4
Communication Error
Flag

0

System Area

Extension 3
Communication Error
Flag

Slave
Station 2
Input Data

Extension 2
Communication Error
Flag

RX(m+3)0 to F

9

A

B

C

D

E

F

A

B

C

D

E

F

RY(m+3)0 to F
Slave
Station 2
OutputData
01

System Area

2

3

4

5

6

7

8

9

● Error Flag Specifications*1: When the slave station 1 communication fails once⇒

RXm6 will be turned on. If the radio communication succeeds in the next cycle, it will be set
back to off.

*2: When the slave station 1 radio wave environment is not good and transmission/reception does not
succeed even after the radio timeout time or longer time elapses⇒

RXm7 to F will be turned on. If the radio communication succeeds in the next cycle, they will
be set back to off.
(If a communication abnormality occurs in the slave station, correct transmission of
information of the extension unit will be unavailable; therefore, the extension
communication error flag will be turned on simultaneously.)*3: When a communication error occurs in the extension unit station no. 1 connected to the slave
station 1⇒

RXm8 will be turned on.
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16. ADDRESS ASSIGNMENT CHANGE WHEN EXTENSIONUNIT ADDED TO RADIO SLAVE STATION
When the extension unit is added to the slave station or when the unit is deleted without using thereserve setting, address assignment change may cause operation of unexpected units. Be sure tocheck the address assignment before operation.
* Refer to the following configuration diagram. When the extension unit is added to the slave* station 1, displacement occurs in the address assignment for the slave station 2.

System before change(Example: Two slave stations and no
extension unit)

One extension unit added to Slave
Station 1

I/O 2 points
Input/output

I/O 2 points
Input/output

SWL31-R4ML

SWL31-R4ML

Address
RXm0 to F
RYm0 to F

16-bit occupation

16-bit occupation[Slave Station 1]

Address
RXm0 to F
RYm0 to F[Slave Station 1]
I/O 16 points
Input/output[SELEX-XY16]

SWL31-R4ML

16-bit occupation[Slave Station 2]

I/O 2 points
Input/output

SWL31-R4ML

Address
RX(m+1)0 to F
RY(m+1)0 to F

16-bit occupation[Slave Station 2]

Address
RX(m+1)0 to F
RY(m+1)0 to F

I/O 2 points
Input/output

Address
RX(m+2)0 to F
RY(m+2)0 to F

RXm, RYm: Values that depend on the parameters of the master station

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WARRANTY
Please confirm the following product warranty details before starting to use the product.
Gratis Warranty Term and Gratis Warranty Range
If any faults or defects (hereinafter "failures") found to be the responsibility of Mitsubishi Electric
System & Service Co., Ltd. occur during use of the product within the gratis warranty term, the productwill be replaced with an alternative one at no cost via the dealer of your purchase.
However, if domestic and overseas business trips are required, expenses to dispatch an engineer shallbe charged for.
In addition, on-site adjustment/trial operation will not be included in our responsibility.
■ Gratis Warranty Term
The gratis warranty term of the product shall be for one year after the date of purchase or delivery
to a designated place.
Note that after manufacture and shipment from Mitsubishi, the maximum distribution period shallbe six months, and the longest gratis warranty term after manufacturing shall be eighteen months.
The gratis warranty term of repair parts shall not exceed the gratis warranty term before repairingthem.
■ Gratis Warranty Range(1) The range shall be limited to normal use within the usage state, usage methods, usage
environment, etc. which follow the conditions and precautions. given in the instruction manual,
caution labels on the product, etc.
(2) Even within the gratis warranty term, the cases below will be excluded from the warranty
range.
1) Failure occurring from inappropriate storage, handling, carelessness, negligence, etc. by thecustomer.
2) Failure caused by unapproved modifications, repairs, etc. to the product by the customer.
3) Failure caused by usage methods other than the original usage method of the product or by ausage method which exceeds the industry standards.
4) Failure that could have been avoided if cables, accessories and equipment specified in the
instruction manual and others. had been normally maintained or replaced.
5) Failure caused by reasons unpredictable by scientific technology standards at time of
shipment by us.
6) Failure caused by external irresistible forces such as fires etc. and failure caused by force
majeure such as earthquakes, lightning, storm, flood damage, etc. which are not within our
responsibility.
7) Any other failure found not to be our responsibility or recognized by the customer as outsideof our responsibility
Onerous Warranty Term after Discontinuation of Production
Mitsubishi shall accept onerous product repairs for seven years after production of the product is
discontinued.
Product or alternative product supply is not possible after production is discontinued.
Exclusion of Chance Loss and Secondary Loss from Warranty Liability
Regardless of the gratis warranty term, Mitsubishi shall not be liable for compensation fordamages arising from any cause found not to be the responsibility of Mitsubishi, chance losses
and lost profits incurred by the customer due to the failure of Mitsubishi products, damage andsecondary damage caused by special reasons regardless of Mitsubishi's expectations,compensation for accidents, and compensation for damage to products other than Mitsubishi
products and other duties.

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Changes in Product Specifications
The specifications given in the catalogs, specifications, technical documents and others are subject tochange without prior notice.
Product Application■ Use Condition
In using Mitsubishi products, the usage conditions shall be that the application will not lead to amajor accident even if any problem or fault should occur in our products and that backup and othermeasures are taken.
■ Application Exceptions(1) Our products have been designed and manufactured for applications in general industries
and other industries. Applications in which the public could be affected significantly such as innuclear power plants and other power plants, public transportation such as railroad andaviation, and applications in which a special quality assurance system is required such as forvehicle equipment, medical machinery, equipment for recreation and amusement, safety
equipment, incineration systems, and facilities which comply with the regulations ofgovernment agencies and individual industries will be excluded from the applications.
(2) Applications in which human life or assets could be greatly affected and for which aparticularly high reliability is required in terms of safety and control systems will be excluded
from the applications.
(3) However, even with the applications above, if the user approves that the application is to belimited and a special quality is not required, application shall be possible.

Ethernet is a trademark of FUJIFILM Business Innovation Corp.
MC Protocol is an abbreviation of MELSEC Communication Protocol.
MELSEC is a trademark of Mitsubishi Electric Corporation.

C&C CENTER OVERSEAS SUPPORT GROUP（JAPAN）
Mail ： osb.webmaster@melsc.jp･The contents of this manual are subject to change without prior notice.
･Unauthorized reproduction prohibited

X903150801F

Issue Date: March, 2024
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