R7M-SV4

INSTRUCTION MANUALDC VOLTAGE/CURRENT INPUT MODULE, 4 points MODEL(Modbus)

BEFORE USE ....
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.
■ PACKAGE INCLUDES:
DC voltage/current 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.

POINTS OF CAUTION■ NONINCENDIVE APPROVAL OPTION• This equipment is suitable for use in Class I, Division 2,Groups A, B, C, D or Non-Hazardous Locations only.
• WARNING! – Explosion Hazard –Substitution of any component may impair suitability forClass I, Division 2.
• WARNING! – Explosion Hazard –• DO NOT disconnect while the circuit is live or unless thearea is known to be free of ignitable concentrations.
• Temperature Code of this equipment is T5 and the Maximum Ambient Temperature is 55°C (Surrounding Temperature inside the fire enclosure).

R7M-SV4■ 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. 90mA
■ GENERAL PRECAUTIONS• Before you remove the unit or mount it, turn off the power
supply 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 continuousvibration. 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 datasheet.

■ CONFORMITY WITH UL APPROVAL• This equipment is suitable for use in Installation Category II and in a Pollution Degree 2 environment.
• Altitude up to 2000 meters.
• This equipment must be mounted inside a suitable fire
enclosure.
• This equipment is to be supplied by a Class 2 power supply.
■ 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.

MG CO., LTD. www.mgco.jp5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-A Rev.7P. 1 / 7

R7M-SV4COMPONENT IDENTIFICATION

5162

SW1-3OFFONOFFON

456

23901

NODE ADD.

4• Conversion Rate / Accuracy (SW1-3, 1-4)

(E)

78456

78456

78

X123RDSD(D)
1 2 3 4 5 6 7 8X1023ERR
RUN

(C)

901

PWR

(B)

901

(A)

CNFG.

B.RATE710 11 12 13 14 15 16 17 18312(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■ STATUS INDICATOR LEDID

COLOR FUNCTION
Turns on when the internal 5V is suppliedRed
normally.
Turns on when the data is received norRed
mally.
Turns on when the received data is abnorRed
mal. Blinks when setting is abnormal.
Red
Turns on when the module is transmitting.
Red
Turns on when the module is receiving.

PWR
RUNERRSDRD■ 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.
456

23237878901

456

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

901

Baud Rate Setting■ EXTENSION MODULE
Combinations with all extension modules are selectable.
■ OPERATING MODE(*) Factory setting• Extension (SW1-1, 1-2)
SW1-1
OFFON
OFF

SW1-2
OFFOFFON

EXTENSION
No extension (*)
Discrete input, 8 or 16 points
Discrete output, 8 or 16 points

SW1-4
OFF
OFF
ON
ON

CONVERSION RATE / ACCURACY
80 msec. / ±0.1% (*)
40 msec. / ±0.2%
20 msec. / ±0.4%
10 msec. / ±0.8%• Input Range (SW1-5, 1-6, 1-7, 1-8)
SW1-5
OFF
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
ON
ON

SW1-6
OFFOFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON

SW1-7
OFFOFF
OFF
OFF
ON
ONONONOFFOFFOFFON

SW1-8OFFOFFOFFOFFOFFOFFOFFOFFON
ONONONINPUT RANGE-10 – +10V DC (*)-5 – +5V DC-1 – +1V DC
0 – 10V DC
0 – 5V DC
1 – 5V DC
0 – 1V DC-0.5 – +0.5V DC-20 – +20mA DC
4 – 20mA DC
0 – 20mA DC
PC Configurator setting■ POWER SUPPLY, MODBUS TERMINAL ASSIGNMENT
4NO.
1234567ID
DB
SLD
FG
DA
DG
+24V
0V

DA
1567
DG +24V
0V
23DB
SLD
FG

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

■ INPUT TERMINAL ASSIGNMENT101112131415161718
VL0I0
VL1I1NC
VL2I2VL3I3123456789VH0 COM0 VH1 COM1 NC
VH2 COM2 VH3 COM3NO.
ID
FUNCTION
NO.
1
VH0 Wide span volt. 0 102 COM0 Common 0113
VH1 Wide span volt. 1 124 COM1 Common 1135NC No connection
146VH2 Wide span volt. 2 15
7 COM2 Common 2168
VH3 Wide span volt. 3 179 COM3 Common 318ID
VL0I0VL1I1NCVL2I2VL3I3

FUNCTIONNarrow span volt. 0
Current range 0
Narrow span volt. 1
Current range 1No connection
Narrow span volt. 2
Current range 2
Narrow span volt. 3
Current range 3■ INPUT RANGE• Wide span : –10 to +10V DC, –5 to +5V DC, 0 to 10V DC,
0 to 5V DC, 1 to 5V DC• Narrow span: –1 to +1V DC, 0 to 1V, –0.5 to +0.5V DC• Current input: –20 to +20mA DC, 0 to 20mA DC,
4 to 20mA DC

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-A Rev.7P. 2 / 7R7M-SV4CONNECTION DIAGRAMWIRING INSTRUCTIONSConnect the unit as in the diagram below.

■ SCREW TERMINALTorque: 0.5 N·m

INPUT 0VH0 14DA

VL0 101DB

I0 115DG

COM0 22SLDINPUT 1VH1 33FG

VL1 12624VDC

I1 1370V■ 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.LtdOthers: 0.25 to 1.65 mm2 (AWG 22 to 16)
Recommended manufacturer: Japan Solderless Terminal
MFG.Co.Ltd, Nichifu Co.,ltd

COM1 4INPUT 2
VH2 6

3.3 (.13) max

I2 16
COM2 7INPUT 3
VH3 8
VL3 176 (.24) max

EXTENSION CONNECTOR

VL2 15mm (inch)

I3 18
COM3 9In order to improve EMC performance, bond the FG
terminal to ground.
Caution: FG terminal is NOT a protective conductor terminal.

■ Input Connection Examples+ VHn

VHn+ VLnVLn

WIDE SPAN
VOLTAGEInNARROW SPAN
VOLTAGE– COMn

In– COMn

VHn+ VLn
CURRENTRANGE

In– COMn

Be sure to close across VLn and In terminals for a current input.

MASTER CONNECTION■ MASTER CONNECTIONTERMINATOR

Host PC

Remote Unit

Remote Unit

Tx+/Rx+Tx–/Rx–
SGRx+
Rx–

DA
DB
DG
SLD
FG

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.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-7803-A Rev.7

P. 3 / 7

R7M-SV4EXTERNAL DIMENSIONS unit: mm (inch)
115 (4.53)

54 (2.13)

18.5 (.73)

17 (.66)

50 (1.97)

DIN RAIL
35mm wide

45627310 11 12 13 14 15 16 17 181234567895.5 (.22)

3 (.12)130 (1.18)

6 (.24)
7–M3 SCREWTERMINALS
for Modbus, POWER[5 (.20)]

6 (.24)
18–M3 SCREWTERMINALSfor INPUTCONFORMITY 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-A Rev.7P. 4 / 7

R7M-SV4• 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 asposible.

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 shieldedcontrol 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-A Rev.7

P. 5 / 7

R7M-SV4■ 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 control
panel. 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 DriveCable

Power Supply
Cable

Often being a noise source

DC Signal Cable
Network Cable

Analog SignalCable

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-A Rev.7

P. 6 / 7

R7M-SV4• 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

ShieldedCable

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

Motor
Drive 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-A Rev.7

P. 7 / 7