All PLC's must be enabled in automatic mode.
The PLC must be in manual mode, the neighbouring PLCs can also be in manual mode, or they are in operational stop.
In the event of an emergency stop in a PLC, the PLC is switched to emergency stop. All neighbouring PLCs are switched to operational stop, i.e. there is no active operating mode, the system is switched to de-energised, i.e. all movement-relevant output modules are de-energised.
After unlocking the emergency stop, the system must be restarted in automatic mode. The neighbouring units are automatically started in automatic mode if they were in automatic mode.
Change of operating mode or interruption
This state is caused by switching an operating mode selector switch. For the neighbouring PLCs (here PLC1 and PLC3), this means in automatic mode that PLC1 and PLC3 are switched to operating stop. This has no influence on manual operation in PLC1 or PLC3.