Program Continuation:

Waiting for a connection to the NC/PLC

The operator panel is connected with the NC and PLC via a serial bus.

This alarm occurs if the MMC is started for the first time and the NC/PLC ramp-up is not yet finished or the communication to these components is faulty.

In connection with this alarm, all display values connected with the NC/PLC become invalid.

Such faults are normal while the controls are ramping up (e.g. after resetting).

- Alarm display.

The alarm disappears automatically as soon as the fault situation has ended.

If this alarm is continuously present, a wide variety of faults may be the cause. (e.g. wire breakage, NC/PLC not ramped up, faulty address/data transfer rate configuration of one of the bus nodes, etc.).


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