Sinumerik Alarm 120008 Control unit switchover, PLC timeout: 001 control unit switchover, PLC timeout: 002 control unit switchover, PLC timeout: 003
Definitions:
• 001: MMC would like to go offline from this NCU. MMC has made the offline request in the online PLC and is waiting for the positive / negative acknowledgement from the PLC.
• 002: MMC would like to go online to this NCU. MMC has called the target PLC and is waiting for the release to go online.
• 003: MMC has requested the active operating mode and is waiting for acknowledgement from the PLC.
Reactions:
– –
Remedy:
Check whether the switchover blocks are loaded and started in the online PLC.
Program Continuation:
Internal
References
- Siemens Diagnostics Guide by Siemens