Siemens SIMATIC FM 351 Manual page 194

Data Blocks/Error Lists
No. Meaning
Encoder wire breakage
144
Cause
Effect
Remedy
Absolute encoder errors
145
Cause
Effect
Remedy
C-24
•
Encoder cable cut or not plugged in.
•
Encoder has no quadrature signals.
•
Incorrect pin assignment.
•
Cable length too long.
•
Encoder signals short circuited.
•
Encoder signal edge error
•
Maximum input frequency of the encoder input
exceeded
•
Failure of the encoder supply.
•
Positioning is aborted.
•
Switching off the outputs
•
With incremental encoders, synchronization is
deleted.
•
Start enable is deleted.
•
Check encoder cable.
•
Keep within encoder specification.
•
Monitoring can be temporarily suppressed at the
operator's risk by setting parameters in the
parameter dialog.
•
Keep to the module technical data.
Problems in frame exchange between the FM 351
and the absolute encoder (SSI) or exchange is
interrupted:
•
Encoder cable cut or not plugged in.
•
Incorrect encoder type
•
Encoder incorrectly set (programmable
encoders)
•
Frame length incorrectly specified
•
Encoder supplies incorrect values (encoder
defective)
•
Interference on measuring system cable
•
Baud rate selected too high
•
Monoflop time of the encoder greater than 64 µs
•
Positioning is aborted.
•
Switching off the outputs
•
Start enable is deleted.
•
Check encoder cable.
•
Check the encoder.
•
Check the frame traffic between encoder and FM
351.
Diagnostic
Interrupt
Yes
Yes
FM 351 Positioning Module
C79000-G7076-C351-02