R7M-MS4

INSTRUCTION MANUALPOTENTIOMETER INPUT MODULE, 4 points MODEL(Modbus)

R7M-MS4

BEFORE USE ....

POINTS OF CAUTION

Thank you for choosing us. Before use, please check contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact our sales office or representatives.

■ CONFORMITY WITH EU DIRECTIVES• The equipment must be mounted inside the instrument
panel of a metal enclosure.
• The actual installation environments such as panel configurations, connected devices and connected wires may
affect the protection level of this unit when it is integrated in a panel system. The user may have to review the CE
requirements in regard to the whole system and employ
additional protective measures to ensure CE conformity.
• Install lightning surge protectors for those wires connected to remote locations. Choose a surge protector with its
maximum surge voltage 40V or less between lines. Recommended model: MDP-D24.

■ PACKAGE INCLUDES:
Potentiometer input module................................................(1)Terminating resistor (110Ω, 0.25W)....................................(1)■ MODEL NO.
Confirm that the model number described on the product isexactly what you ordered.
■ INSTRUCTION MANUALThis manual describes necessary points of caution when
you use this product, including installation, connection andbasic maintenance procedures.

■ POWER INPUT RATING & OPERATIONAL RANGE• Locate the power input rating marked on the product andconfirm its operational range as indicated below:		 24V DC rating: 24V ±10%, approx. 80mA
■ GENERAL PRECAUTIONS• Before you remove the unit or mount it, turn off the powersupply and input signal for safety.
■ ENVIRONMENT• Indoor use.
• When heavy dust or metal particles are present in theair, install the unit inside proper housing with sufficientventilation.
• Do not install the unit where it is subjected to continuous
vibration. Do not subject the unit to physical impact.
• Environmental temperature must be within -10 to +55°C(14 to 131°F) with relative humidity within 30 to 90% RH
in order to ensure adequate life span and operation.
■ WIRING• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).
• Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■ AND ....
• The unit is designed to function as soon as power is supplied, however, a warm up for 10 minutes is required forsatisfying complete performance described in the data
sheet.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-Q Rev.4

P. 1 / 7

R7M-MS4COMPONENT IDENTIFICATION

62456

23901

5
1

■ OPERATING MODE(*) Factory setting•  Extension (SW1-1, 1-2)

(E)7878456

78

X1456

NODE ADD.

4(D)1 2 3 4 5 6 7 8X1023RDSD23ERR
RUN(C)901

PWR(B)

901

(A)

CNFG.

B.RATE710 11 12 13 14 15 16 17 18

312(F)

3456789(G)(A) Status Indicator LED(B) Node Address Setting Rotary SW(C) Baud Rate Setting Rotary SW(D) Operating Mode Setting DIP SW (SW1)(E) PC Configurator Jack
(F) Modbus, Power Supply Terminals(G) Input Terminals

SW1-1
OFFONOFFSW1-2OFFOFFON

EXTENSION
No extension (*)
Discrete input, 8 or 16 points
Discrete output, 8 or 16 points•  Conversion Rate / Accuracy (SW1-3, 1-4)
SW1-3
OFFON
OFFON

SW1-4OFFOFFONON

CONVERSION RATE / ACCURACY
80 msec. / ±0.1% (*)
40 msec. / ±0.2%
20 msec. / ±0.4%
10 msec. / ±0.8%

Note : Be sure to set unused SW1-5 through 1-8 to OFF.

■ POWER SUPPLY, MODBUS TERMINAL ASSIGNMENT■ STATUS INDICATOR LED
ID

COLOR FUNCTION
Turns on when the internal 5V is supplied
Rednormally.
Turns on when the data is received norRedmally.
Turns on when the received data is abnorRedmal. Blinks when setting is abnormal.
RedTurns on when the module is transmitting.
RedTurns on when the module is receiving.

PWRRUNERR
SDRD■ NODE ADDRESS
Node Address is selected between 1 and 99 in decimal. Theleft switch determines the tenth place digit, while the rightswitch does the ones place digit of the address.
2378

78

23NO.
12
3
4
567DA
1567
DG +24V 0V
23DBSLDFGID
DBSLDFGDA
DG+24V0V

FUNCTION, NOTES---ShieldFG------Power input (24V DC)
Power input (0V)

■ INPUT TERMINAL ASSIGNMENT
101112131415161718H0S0H1S1NC
H2S2H3S3123456789NC
L0NC
L1NCNC
L2NC
L3456

901

456

4

Factory setting : 00901

Node Address Setting (x1)Node Address Setting (x10)■ BAUD RATEBaud Rate is selected with the rotary switch.
7823456

0 : 38.4 kbps (factory setting)1 : 19.2 kbps
2 : 9600 bps
3 : 4800 bps

NO.
123456789ID
NCL0NCL1NCNC
L2NCL3FUNCTION
No connection
Pot L0No connection
Pot L1
No connection
No connection
Pot L2
No connection
Pot L3NO.
101112131415161718ID
H0S0
H1S1
NCH2
S2H3
S3

FUNCTION
Pot H0Pot S0Pot H1
Pot S1
No connection
Pot H2
Pot S2
Pot H3
Pot S3901

Baud Rate Setting■ EXTENSION MODULE
Combinations with all extension modules are selectable.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-Q Rev.4

P. 2 / 7R7M-MS4EXTERNAL DIMENSIONS unit: mm (inch)
115 (4.53)

17 (.66)

18.5 (.73)

54 (2.13)

50 (1.97)

DIN RAIL
35mm wide45627310 11 12 13 14 15 16 17 181234567893 (.12)

15.5 (.22)

30 (1.18)

6 (.24)6 (.24)
7–M3 SCREWTERMINALS
for Modbus, POWER

18–M3 SCREWTERMINALS
for INPUT

WIRING INSTRUCTIONSConnect the unit as in the diagram below.

■ SCREW TERMINALTorque: 0.5 N·mDA

S0 111DB

L0 25DG

INPUT 1H1 122SLD

S1 133FG

L1 4624VDC

INPUT 2H2 15

70V

S2 16
L2 7INPUT 3H3 17S3 18L3 9■ SOLDERLESS TERMINAL mm (inch)
Refer to the drawing below for recommended ring tongue
terminal size. Spade tongue type is also applicable. Solderless terminals with insulation sleeve do not fit.
Communication cable: Applicable wire size 0.2 to 0.5 mm2(AWG26 - 22)
Recommended manufacturer: Japan Solderless Terminal
MFG.Co.Ltd
Others: 0.25 to 1.65 mm2 (AWG 22 to 16)
Recommended manufacturer: Japan Solderless Terminal
MFG.Co.Ltd, Nichifu Co.,ltd
3.3 (.13) max
6 (.24) max

4

EXTENSION CONNECTORCONNECTION DIAGRAMINPUT 0H0 10[5 (.20)]mm (inch)

In order to improve EMC performance, bond the FG
terminal to ground.
Caution: FG terminal is NOT a protective conductor terminal.

■ Input Connection Example
POTENTIOMETER
max.
+
3Hn

2Snmin.

1–Ln

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-Q Rev.4

P. 3 / 7

R7M-MS4

MASTERCONNECTION■ MASTER CONNECTIONTERMINATOR

Host PC

Remote Unit

Remote Unit

Tx+/Rx+Tx–/Rx–SGRx+Rx–DA
DB
DGSLDFG

DA
DB
DG
SLD
FG

TERMINATOR

Be sure to connect the terminating resistor included in the product package to the unit at both ends of transmission line.
The terminator must be connected across DA and DB.
The Host PC can be located other than at the extreme ends of transmission line.

CONFORMITY WITH CE MARKING■ CE MARKING
CE marking requires to integrate safety regulations existed in each country in EU territory and to secure smooth distributionof products of which safety is guaranteed. It is mandatory by law that products distributed and sold in EU territory to have
CE mark which shows that the product conforms with the requirements of EU Directive. Each EU Directive describes thescope of apparatuses to which that EU Directive is applied. The R7M must conform with EMC Directive.
Each Directive states only basic requirements. In order to mark the CE on an assembled machinery equipment, its manufacturer needs to check the overall conformity with Directives applicable to it.
■ WARNINGS AND CAUTIONS WHEN INSTALLING THE R7M
The R7M needs to be installed in a control panel. This is effective not only to ensure general safety but also to contain noise
emissions by the R7M inside the control panel. We conduct a series of testing to see that the product conforms to EMC Directive while it is installed in the control panel.
Warning and cautions when installing R7M are stated below.
• Use control panels with an internal panel plate, both made of metal, when installing the R7M.
• Make sure to adequately ground the control panel and the internal panel plate with a thick cable to maintain low impedance at high frequency.
• Use shielded cables for the signals taken out of the control panel.
• Choose a thick and short cable to ground the FG terminal of the R7M module to the internal panel plate of the control panel.
Note: If electromagnetic radiation disturbance increases by grounding the FG terminal, remove the grounding.
• When painting the internal plate of the control panel, apply masking to expose metal surface to secure conductivity at thesections where the following parts are attached:- Bolts attaching the internal panel to the control panel- Ground for the FG of the R7M module- Earth clamp on the shielded cable• Noise emissions inside the control panel might leak through its openings. Design them as small as possible. Recommended
diameter is 10 cm or less.
Supplement:
Additional measures may be taken depending upon actual installation sites. These points of cautions are illustrated in thenext page.
• Prevent noise leakage by wrapping cables using shield covers, shield tubes and flexible conduits etc. if noise leaks throughthe cable outlet.
• Use an electromagnetic shield gasket and block up the gap between the control panel cabinet and its cover, if noise leaks
through it.
• Connecting the internal panel plate and the cover of the control panel to the main cabinet using an earth strap may beeffective to strengthen the grounding.
• Electromagnetically shielded control panel cabinet is effective for shielding.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-Q Rev.4

P. 4 / 7

R7M-MS4• Points of cautions applicable when installing the R7M Series

Install the R7M Series inside
a control panel.
Attachment part of earth
clamp should be fixed withscrew in conduction with theinternal panel plate.

Keep the opening forventilation as small as
posible.

Attach an electromagnetically shieldedfilter when noise leaks
through the opening.

Keep the opening
for cabling as small as
possible.
To external apparatus
Use (e.g.) a shield coverwhen noise leaks throughthe opening.

By connecting theinternal panel plate
and the panel cover withan earth strap, grounding
may be strengthened and
EMC may be improved.
Install an electromagneticallyshielded gasket whennoise leaks throughShielding is strengthened
the opening.
by using an electromagnetically shielded
control panel.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANGround the control panel
at low impedance using(e.g.) braided wires.

EM-7803-Q Rev.4

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R7M-MS4■ WARNINGS AND CAUTIONS WHEN LAYING CABLES
Signal cables connected to the R7M contain high-frequency components. Since these cables has the same effect as an antenna, they emit these high-frequency components to the external space as noise or overlaps noise from the external spaceon themselves.
Cables with shielding should be used for the signal line due to the above reason.
EMC conformance test is conducted in the condition that shielded cables and earth clamps are used with the R7M.
Warning and cautions when laying cables are stated below. These points of cautions are illustrated in the next page.
• Use shielded cables for those signal cables installed out of the control panel and for thermocouple and RTD extension wires.
• All the network cables connected to R7M should be shielded.
• Use shielded cables for network communication.
• Expose the shield at a part of the cable cover, clip it with an earth clamp, and ground it to the internal panel of the controlpanel. A drain wire connected to the panel in a pig-tail form cannot maintain low impedance against high-frequency noise,thus grounding (noise shielding) in this form will not be effective.		
Supplement:
Additional measures may be taken depending upon actual installation sites. These points of cautions are illustrated in thenext page.
• Keep cables as short as possible. It prevents noise emissions from the cables and noise overlapping to the cables.
• Attach a ferrite core to reduce noise impact to the signal cables susceptible to the noise. Ferrite core can be attached close
to the cable outlet of the control panel or close to the I/O terminal or connector, whichever is more effective. Also, the impact
might be reduced by winding the cable around the ferrite core for extra turns or attaching multiple ferrite cores.
• Keep cables which are easily affected by noise away from those which can be a noise source.
Motor Drive
Cable

Power Supply
Cable

Often being a noise source

DC Signal Cable
Network Cable

Analog Signal
Cable

Often subject to noise interference.

In the following are examples of effective ways to lay cables separately:• Keeping physical distance (farther than 20 cm from motor drive cables, farther than 10 cm for other groups).
• Dividing off by a grounded metal plate• Grouping into separate grounded metal pipes or cable shields.
Wires on each side of a filter should not be too close to each other. Noise could ride onto the other side of cable.
Extra attention needs to be paid at the following parts.
• Noise filter that is enclosed in power cables.
• Ferrite core that is attached to signal cables.
• Noise limiting circuit (surge quenching circuit, transient absorber circuit, etc.) that is enclosed in signal cables.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-Q Rev.4

P. 6 / 7

R7M-MS4• Points of cautions applicable when wiring the R7M Series

Keep the wires away fromeach other at both ends ofthe filter.

NoiseFilter

To external apparatus

Keep the cable asshort as possible.

EarthClamp

Shielded
Cable

Remove a part of the shieldedcable cover and ground it
to the internal panel
plate using an earthclamp.

To connect withapparatuses outside
the control panel via
Modbus, ground thecable shield using
an earth clamp.

To external apparatus

MotorDrive Cable

Maintain distance between
cables and noise sources.

Grounding in pig tail form
is not effective.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-Q Rev.4

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