Sinumerik Alarm 109003 No switchover: Switchover disable set in target PLC
MMC would like to go online to this NCU. The MMC switchover is disabled in the MMC PLC online interface in DB19. (MMCx_SHIFT_LOCK = TRUE, x = 1,2)
The MMC switchover is disabled/enabled in the machine manufacturer’s PLC program. Reference to the machine manufacturer’s documentation.
- Siemens Diagnostics Guide by Siemens