Siemens SIMATIC FM 452 Manual page 199

No. Meaning
145 Frame error absolute encoder
Cause
Effect
Rectification
146 Missing pulses frame incremental encoder
Cause
Effect
Rectification
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
The frame traffic between FM 452 and the absolute
encoder (SSI) is erroneous or 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
Cam processing switched off
Track outputs are switched off
The last correct actual value remains unchanged till
the end of the next correct SSI transfer
Check encoder cable.
Check the encoder.
Check the frame traffic between encoder and FM
452.
Encoder monitoring has detected missing pulses.
Number of increments per encoder revolution is
incorrectly entered.
Encoder defective: Does not supply the specified
number of pulses.
Bad or missing zero marker.
Interference affecting the encoder cable.
Cam processing stopped
Track outputs are turned off
The synchronization is deleted.
Enter the number of increments/encoder revolution
correctly.
Check the encoder and encoder cable.
Keep to shielding and grounding regulations.
Monitoring can be temporarily suppressed at the
responsibility of the operator by setting appropriate
parameters in the parameter assignment user
interface.
Data Blocks/Error Lists
Diagnostic
Interrupt
Yes
Yes
C-25