Red LED
If the LED is blinking con ti nuously at a 2-second rat e, it is indicating proper op eration. If it is
lit continuously it indi cates a problem requiri ng replacement of the mo dul e. Off continuously
indicates that the pow er s hou ld be checked. If the red LE D bli nks 3 times per second, a
software error has bee n dis c o vered and the module mu s t be replaced. If there is no inpu t
power, check fuses and the circuit breaker. If fuse is good, check for shorted secondary of
transformer, or if powe r is present to the module, r epl ace the module.
Green LEDs
There are 1 o r 2 green LEDs on each type of module. The se LEDs indicate communication
status between differ en t parts of the controller an d the network modules as fo llows:
LID Modul e

Upper LED

— Communication with CC N network, if present; bl inks when communicati on
occurs.

Lower LED

— Communication with PSIO module; must blink every 5 to 8 seco nds when the
LID default screen is displayed.