ABB AC 800M

MasterBus 300 Interface – CI855 Section 5 Maintenance
136 3BSE 027 941 R301
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Neither R(un) nor F(ault) LEDs
are ON
The CI855 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
processor unit
• Initiate a reset signal (INIT) from the
processor unit
• Replace the CI855 unit
F(ault) LED is ON Check all cables and connectors for damage and
loose or poor connections.
• Repair as necessary
R(un) LED is flashing Check that the relevant units are sending data.
Check if the CI855 board is in the process of
being restarted or configured. If so, allow time for
this to finalize.
If the condition persists:
• Halt the application program and initiate a
restart.
• Replace the CI855 board.