Data Blocks/Error Lists
C-24
FM 351 Positioning Module
C79000-G7076-C351-02
No. Diagnostic
Interrupt
Meaning
144
Encoder wire breakage Yes
Cause
• 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.
Effect
• Positioning is aborted.
• Switching off the outputs
• With incremental encoders, synchronization is
deleted.
• Start enable is deleted.
Remedy
• 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.
145
Absolute encoder errors Yes
Cause
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
Effect
• Positioning is aborted.
• Switching off the outputs
• Start enable is deleted.
Remedy
• Check encoder cable.
• Check the encoder.
• Check the frame traffic between encoder and FM
351.
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