M-system R7M-DC8C Instruction Manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-7803-U Rev.4 P. 1 / 7

INSTRUCTION MANUAL

RELAY CONTACT OUTPUT MODULE, 8 points

(Modbus)

MODEL

R7M-DC8C

BEFORE USE ....

Thank you for choosing M-System. 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 M-System’s Sales Office or representatives.

■ PACKAGE INCLUDES:

Discrete output module.......................................................(1)

Terminating resistor (110Ω, 0.25W) ...................................(1)

■ MODEL NO.

Confirm Model No. marking on the product to be exactly
what you ordered.

■ INSTRUCTION MANUAL

This manual describes necessary points of caution when
you use this product, including installation, connection and
basic maintenance procedures.

POINTS OF CAUTION

■ CONFORMITY WITH EU DIRECTIVES

•This equipment is suitable for Pollution Degree 2 and
Measurement Category II (output, transition voltage
1500V) with the maximum operating voltage 125V.

*1

Ba-

sic insulation (output to power: 150V)

*2

is maintained.
Prior to installation, check that the insulation class of
this unit satisfies the system requirements.

*1. For use in Measurement Category I (output, transition

voltage 1500V) with the maximum operating voltage
250V.

*2.

For use in Measurement Category I, 300V.

•The equipment must be mounted inside the instrument
panel of a metal enclosure.

•Altitude up to 2000 meters.

•The equipment must be installed such that appropriate

clearance and creepage distances are maintained to con­form to CE requirements. Failure to observe these re­quirements may invalidate the CE conformance.

•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.

■ POWER INPUT RATING & OPERATIONAL RANGE

•Locate the power input rating marked on the product and
confirm its operational range as indicated below:

24V DC rating: 24V ±10%, approx. 60mA

■ GENERAL PRECAUTIONS

•Before you remove the unit or mount it, turn off the power
supply and output signal for safety.

■ ENVIRONMENT

•Indoor use.

•When heavy dust or metal particles are present in the

air, install the unit inside proper housing with sufficient
ventilation.

•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 for
satisfying complete performance described in the data
sheet.

R7M-DC8C

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-7803-U Rev.4 P. 2 / 7

COMPONENT IDENTIFICATION

5

4

3

2

1

0

9

8

7

6

5

4

3

2

1

0

9

8

7

6

5

4

3

2

1

0

9

8

7

6

ERR

RD

RUN SD

PWR

X10 X1

NODE ADD. B.RATE

1 2 3 4 5 6 7 8

0 1 2 3 4 5 6 7 8 9 A B C D E F

4567

123

10 11 12 13

2341

15 16 17 18

7896145

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

(F) (G)

(B)(A) (C) (D) (E)

■ STATUS INDICATOR LED

ID COLOR FUNCTION

PWR Red

Turns on when the internal 5V is supplied
normally.

RUN Red

Turns on when the data is received nor­mally.

ERR Red

Turns on when the received data is

abnor-

mal. Blinks when setting is abnormal.
SD Red Turns on when the module is transmitting.
RD Red Turns on when the module is receiving.

■ NODE ADDRESS

Node Address is selected between 1 and 99 in decimal. The
left switch determines the tenth place digit, while the right
switch does the ones place digit of the address.

5

4

3

2

1

0

9

8

7

6

5

4

3

2

1

0

9

8

7

6

Node Address Setting (x1)

Factory setting : 00

Node Address Setting (x10)

■ BAUD RATE

Baud Rate is selected with the rotary switch.

5

4

3

2

1

0

9

8

7

6

Baud Rate Setting

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

■ OPERATING MODE

(*) Factory setting

•   Output at the Loss of Communication (SW1-4)

SW1-4 OUTPUT AT THE LOSS OF COMMUNICATION

OFF Reset the output (turned off)

ON

Hold the output (*)(maintains the last data received
normally)

Note : Be sure to set unused SW1-1 through 1-3 and 1-5 through

1-8 to OFF.

■ DISCRETE OUTPUT STATUS INDICATOR LED

LED indicators show the signal status.
ON : LED ON
OFF : LED OFF

■ POWER SUPPLY, MODBUS TERMINAL ASSIGNMENT

4DA5DG6

+24V

1DB2

SLD3FG

7

0V

NO. ID FUNCTION, NOTES

1 DB ---­2 SLD Shield
3 FG FG
4 DA ---­5 DG ---­6 +24V Power input (24V DC)
7 0V Power input (0V)

■ OUTPUT TERMINAL ASSIGNMENT

10

+24V11Y012Y1

10V2

COM03COM0

13

Y2

4

COM0

14

Y3

5

COM0

15

Y4

6

COM1

16

Y5

7

COM1

17

Y6

8

COM19COM1

18

Y7

NO.

ID FUNCTION

NO.

ID FUNCTION

1 0V 0V 10 +24V 24V DC
2 COM0 Common 0 11 Y0 Output 0
3 COM0 Common 0 12 Y1 Output 1
4 COM0 Common 0 13 Y2 Output 2
5 COM0 Common 0 14 Y3 Output 3
6 COM1 Common 1 15 Y4 Output 4
7 COM1 Common 1 16 Y5 Output 5
8 COM1 Common 1 17 Y6 Output 6
9 COM1 Common 1 18 Y7 Output 7

R7M-DC8C

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-7803-U Rev.4 P. 3 / 7

WIRING INSTRUCTIONS

■ SCREW TERMINAL

Torque: 0.5 N·m

■ SOLDERLESS TERMINAL

Refer to the drawing below for recommended ring tongue
terminal size. Spade tongue type is also applicable. Solder­less terminal:
Applicable wire size: 0.25 to 1.65 mm

2

(AWG 22 to 16)
Recommended manufacturer: Japan Solderless Terminal
MFG. Co., Ltd, Nichifu Co., Ltd

6 (.24) max

3.3 (.13) max

mm (inch)

CONNECTION DIAGRAM

Connect the unit as in the diagram below.

4 Points / common

10

14

1

2

5

11

+

24V

Y0

0V

Y3

COM0

COM0

+

–

+

–

18

6

9

15

Y4

Y7

COM1

COM1

+

–

+

–

8 Points / common

10

14

1

2

5

11

+

24V

24V DC

Y0

0V

+

–

Y3

15

Y4

18

Y7

COM0

COM0

6

9

COM1

COM1

+

–

+

–

24V DC

+

–

5

2

6

4

7

13

8

9

14

12

15

11

16

17

18

COM0

COM0

COM0

Y0

Y1

Y2

Y3

COM0

COM1

COM1

COM1

Y4

Y5

Y6

Y7

COM1

3

4

1

2

5

3

FG

6

7

24 V DC

0 V

SLD

DG

DB

DA

10

1

0 V

+

24 V

■ Output Connection Example

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

MASTER CONNECTION

■ MASTER CONNECTION

Tx+/Rx+
Tx–/Rx–

SG
Rx+
Rx–

Host PC

DA
DB
DG

SLD

FG

Remote Unit

DA
DB
DG

SLD

FG

Remote Unit

TERMINATOR 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.