MODEL: R3-US4

R3-US4 SPECIFICATIONS

ES-8449 Rev.7 Page 7/7

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

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

RTD

POTENTIOMETER

THERMOCOUPLE

• Upscale/no burnout

• Downscale burnout

–

–

+

+

DC VOLTAGE

+

-

B

A

B

INPUT CONNECTION

C

B

C

B

A

TERMINAL NETWORK

C

B

A

2

1

11

4

3

13

6

5

15

8

7

17

A

B

C

A

B

C

A

CJC

Sensor

–

+

-

C

B

A

CJC

Sensor

Control

Circuit

9

11

10

14

12

16

18

20

19

+

–

3

2

1

max.

min.

+

1

2

Photo

MOSFET

Multiplexer

Floating

A/D Converter

INPUT 1

4

6

Communication

Circuit

INTERNAL POWER

RUN

LED

ERR

LED

INTERNAL BUS A

*1. For dual redundant communication.

*2. DO NOT connect the terminals 9, 10, 12, 14, 16, 18, 19 and 20.

INPUT 4

INPUT 1

INPUT 2

INPUT 3

comp.wire

comp.wire

Note 1: Remove CJC sensor for RTD or potentiometer input. The CJC sensor does not affect to DC voltage input.

Note 2: Be sure to eliminate noise as much as possible by e.g. using shielded cables. Ground the signal shield to

a most stable earth point in the environment.

Note 3: The temperature imbalance around the terminal affects greatly the cold junction compensation accuracy.

In order to minimize such imbalance, do not expose the input terminals directly to the wind from a cooling fan.

*2

■

■

■

■

■

■

Input Circuit

13

3

INPUT 2

Input Circuit

15

5

INPUT 3

Input Circuit

17

7

8

INPUT 4

Input Circuit

Specifications are subject to change without notice.