MODEL: 73VR21

73VR21 SPECIFICATIONS

ES-7395 Rev.29 Page 10/18

https://www.m-system.co.jp/

CONNECTION DIAGRAM

Note: In order to improve EMC performance, bond the FG terminal to ground.

Caution: FG terminal is NOT a protective conductor terminal.

FG

JACK

USB

V(–)

U(+)

RJ-45 MODULAR JACK

INPUT 8

7A

7B

7C

INPUT 7

8A

8B

8C

Analog

Input

Circuit 7

Analog

Input

Circuit 8

INPUT 10

9A

9B

9C

INPUT 9

10A

10B

10C

Analog

Input

Circuit 9

Analog

Input

Circuit 10

INPUT 12

11A

11B

11C

INPUT 11

12A

12B

12C

Analog

Input

Circuit 11

Analog

Input

Circuit 12

TRIGGER

INPUT

ALM+

ALM–

ALARM

OUTPUT

TRG+

TRG–

Isolated

Alarm Output

Isolated

Trigger Input

C

B

A

ext. wire

+

–

+

–

C

B

A

C

B

A

ext. wire

–

+

–

+

C

B

A

+

–

A

B

B

■ DC INPUT

■ T/C INPUT

• Upscale / No Burnout

■ T/C INPUT

• Downscale Burnout

■ RTD INPUT

Input Connection Examples

Note 1:

Note 2:

Note 3:

Note 4:

In order to prevent instability in measured values caused by noise entering through the I/O terminals,

grounding the signal shield to a most stable earth point in the environment is recommended.

The smaller is common mode voltage (DC and AC) between C terminals and between C and FG, the better is

measuring accuracy. Connecting between C terminals and if possible to FG will yield the best accuracy.

Resistor modules (model: REM3-250) can be connected to 1A through 12C terminals to convert current inputs

into voltage. However, it is not recommended when TC inputs are mixed because the heat developed on and

around the REM3 affects the cold junction compensation performance. We recommend that REM3 be connected

on a separate terminal board.

When the internal temperature sensors are used for CJC, temperature imbalance around the terminal block affects

greatly the CJC accuracy. In order to minimize such imbalance, do not use wires of large diameter which has large

heat dissipation. Be sure to close the terminal cover. Do not expose the module directly in the line of wind from a

cooling fan.

CJC

SENSOR

POWER

Ethernet

10BASE-T / 100BASE-TX

Micro

Computer

Control

Module

*1. Usable terminals depend upon the number of inputs.

metal leg

INPUT 2

1A

1B

1C

INPUT 1

2A

2B

2C

Analog

Input

Circuit 1

Analog

Input

Circuit 2

INPUT 4

3A

3B

3C

INPUT 3

4A

4B

4C

Analog

Input

Circuit 3

Analog

Input

Circuit 4

INPUT 6

5A

5B

5C

INPUT 5

6A

6B

6C

Analog

Input

Circuit 5

Analog

Input

Circuit 6

*1

CJC

SENSOR

metal leg