Product specifications

PROFIBUS DP – CI854/CI854A Section 5 Maintenance
214 3BSE036351-510 A
PROFIBUS DP – CI854/CI854A
Table 34. PROFIBUS DP CI854/CI854A – Fault-Finding
Indication Possible Cause and Corrective Action
Neither R(un) nor F(ault)
LED’s are ON
The CI854/CI854A board is in the process of
being restarted or configured. Allow time for this to
finalize.
If the condition persists, and all other units on the
CEX-bus have non-illuminated LEDs:
• Check that a valid HW configuration including
the CI854 is downloaded to the controller.
• Check the CEX-bus fuse inside the PM8xx
processor unit.
• Initiate a reset signal (INIT) from the PM8xx
processor unit.
• Replace the CI854/CI854A unit.
F(ault) LED is ON Check that the CI854 board is in the process of
being restarted. Allow time for this to finalize.
Check that there is no configuration fault reported
from CI854/CI854A in CBM.
If the status remains initiate a reset signal (INIT)
from the PM8xx processor unit. If the status still
remains after the reset replace the CI854/CI854A
unit.
RxA LED is OFF No communication on Line A.
• Check that slaves are configured and
connected to this line.
• If redundant slaves are used check that the
redundancy is working properly. The backup
slave has to answer to the life list requests
sent by the master.
• Check all cables and connectors for damage
and loose or poor connections.