Displaying module states
(Original Document)
About us
General
This is carried out with 4 LEDs RUN, ERR, COM, I/O which are located on the module. Their state (LED off, flashing or on) provides information on the operating mode of the module.
LED state:
LEDs
On
Flashing
Off
RUN (green)
Module operating normally
Module self-testing (1)
Faulty module, or module switched off
ERR (red)
Serious internal fault, module broken down
Module self-testing (1) Fault: system OK but:
  • application fault or
  • AS-i bus error
No internal error
COM (green)
-
Module self-testing (1) Communication on AS-i bus
No communication on AS-i bus
I/O (red)
Input/output error
Module self-testing (1)
Module operating normally
(1) the 4 LEDs flash simultaneously during self-testing mode when the module is switched on.