CIB_SR 1.2V Power Supply Not Present

What does PWR/1.2V Off (CIB_SR) mean?

The PWR/1.2V Green LED for the CIB_SR module is OFF, indicating a lack of 1.2V supply voltage to the module. This absence of critical operating voltage prevents the CIB_SR module from functioning correctly and could result in the non-operation of interconnected I/O nodes.

• The 1.2V power supply to the CIB_SR module is not present.
• The CIB_SR module requires 1.2V power, which is currently absent.
• Failure or absence of the 1.2V power rail for the CIB_SR communication board.

Click steps to track your progress.

1. 1

   Check fuse F17.3 on the CCU_SR for continuity and proper rating.

2. 2

   Verify the presence and correct seating of jumper plug X308.

3. 3

   Check fuse F308 on the CCU_SR for continuity and proper rating.

4. 4

   If an external supply is used via X308, check the external power supply to ensure it provides the rated voltage of 24 V.