ABB AC 800M

Section 5 Maintenance S100 I/O Interface – CI856
3BSE 027 941 R301 137
S100 I/O Interface – CI856
Table 29. S100 I/O CI856 – Fault Finding
Fault Possible Cause and Corrective Action
Neither R(un) nor F(ault)
LED’s are ON
The CI856 unit is in the process of being
configured. Allow time for this to finalize.
If the condition persists, and no other unit LED on
the CEX-bus is lit:
• Check the CEX-bus fuse inside the PM8xx
processor unit
• Initiate a reset signal (INIT) from the PM8xx
processor unit
• Replace the CI856 unit
F(ault) LED is ON The CI856 unit is in the process of being
restarted. Allow time for this to finalize.
Replace unit if the condition persists.