Contact assignment and LEDs

+R1

1

Input +R1

RL1

2

Input RL1

+R2

3

Input +R2

RL2

4

Input RL2

+R3

5

Input +R3

RL3

6

Input RL3

+R4

7

Input +R4

RL4

8

Input RL4

-R1

9

Input –R1

n.c.

10

reserved

-R2

11

Input –R2

n.c.

12

reserved

-R3

13

Input -R3

n.c.

14

reserved

-R4

15

Input -R4

n.c.

16

reserved

Run

Green illuminated

Normal operation

Off

Watchdog-timer overflow has occurred.
If no process data is transmitted to the bus coupler for 100 ms, the green LEDs go out

Error

red illuminated

The respective channel is affected by a short circuit or broken wire.
The resistance is in the invalid range of the characteristic curve.

Off

The resistance is in the valid range of the characteristic curve.