Data Blocks/Error Lists
C-23
FM 351 Positioning Module
C79000-G7076-C351-02
Class 128: Diagnostic Errors
No. Meaning Diagnostic
Interrupt
4
External auxiliary voltage missing Yes
Cause
• External 24 V auxiliary supply is not connected or
failed.
• Fuse on module defective
• Undervoltage
• Ground wire break
Effect
• Positioning is aborted on all channels
• Switching off the outputs
• Deletion of the synchronization for Incremental
encoders if the auxiliary supply fails
• The FM 351 has not been assigned parameters.
• Start enable is deleted.
Remedy
Make sure that the 24 V connection is correct. (If 24
V connection is correct, then the module is
defective.)
50
Front connector missing (FM 451) Yes
Cause
Front connector of the positioning module not
inserted.
Effect
• No external 24 V auxiliary supply
• Module not ready for operation
Remedy
Insert the front connector of the positioning module.
51
Watchdog tripped Yes
Cause
• Strong interference on the FM 351.
• Error in the FM 351.
Effect
• Module is reset.
• All outputs deactivated
• Provided that after resetting the module, no
module defect is detected, the module is ready
for operation again.
• The module signals the expired WATCHDOG
with “entering state” and “leaving state”.
Remedy
• Eliminate the interference.
• Contact the relevant sales department who will
require details of the circumstances leading to
the error.
• Replace the FM 351.
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