ABB AC 800M

Section 5 Maintenance PROFIBUS DP-V1 – CI854
3BSE 027 941 R301 135
PROFIBUS DP-V1 – CI854
Table 27. PROFIBUS DP-V1 CI854 – Fault-Finding
Indication Possible Cause and Corrective Action
Neither R(un) nor F(ault)
LED’s are ON
The CI854 board is in the process of being
restarted or 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 CI854 unit.
F(ault) LED is ON The CI854 board is in the process of being
restarted, or a fatal error occurred. Allow time for
this to finalize. If the status remains replace the
CI854 unit.
RxA LED is OFF No communication on Line A.
• Check that slaves are connected to this line
and configured.
• Check all cables and connectors for damage
and loose or poor connections.
RxB LED is OFF No communication on Line B.
• Check that slaves are connected to this line
and configured.
• Check all cables and connectors for damage
and loose or poor connections.