KL4494 - Analog terminal with two input and two output channels, -10 V...+10V

Diagnostic LEDs

The four green RUN LEDs indicated the operating state of the terminal channels.

KL4494 - LEDs

Meaning of the LED displays

 
LED
Color
Channel
State
On
off
Run IN 1
green
Input 1
normal operation
A watchdog-timer overflow has occurred. The green LEDs go out if no process data are transferred between the controller and the Bus Coupler for more than 100 ms.
Run IN 2
Input 2
Run OUT 1
Output 1
Run OUT 2
Output 2