Control unit switchover, PLC timeout: %1
%1 = -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.
Check whether the switchover blocks are loaded and started in the online PLC.
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