Alarm 120201 (Communication interrupted) & 120202 (Waiting for connection to NC)

Fault:

Alarm 120201 (Communication interrupted) came randomly and frequently. Sometimes it turned to be 120202 (Waiting for connection to NC).

Remedy:

The information on the 840D diagnostic manual is as follows:
120201 Communication interrupted
Definition
The operator panel is connected with the NC and PLC via a serial bus. This alarm occurs if the communication to these components is faulty. Together with this alarm, all display values connected with NC/PLC become invalid. Such malfunctions are normal during startup of the controls (e.g. after reset).
Reaction
Alarm display.
Remedy
The alarm disappears automatically as soon as the error situation is terminated. If this alarm is pending permanently, this may have very different error causes (e.g. cable break, no startup of NC/PLC, incorrect address/baud rate configuring of one of the bus nodes etc.).
120202 Waiting for connection to NC
Definition
The operator panel is connected to the NC and PLC via a serial bus. This alarm occurs when the MMC is started up for the first time if the NC/PLC power-up is not yet complete, or if an error occurs during communication between these components. All display values associated with the NC/PLC are rendered invalid by this alarm. Such malfunctions are normal during startup of the controls (e.g. after reset).
Reaction
Alarm display.
Remedy
The alarm disappears automatically as soon as the error situation is terminated. If this alarm is pending permanently, this may have very different error causes (e.g. cable break, no startup of NC/PLC, incorrect address/baud rate configuring of one of the bus nodes etc.).

It can be seen that the failure of the machine is probably caused by the poor condition of the bus line between MMC and NC (purple) or connectors. After removing, re-inserting and fixing the plugs the alarm disappeared.
If it does not work later, can try cleaning the connectors or replacing the line.

44 comments on “Alarm 120201 (Communication interrupted) & 120202 (Waiting for connection to NC)

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  5. Hi,

    I have in this moment the error code 129202 “error connection”. My problem was started when the battery of my CNC was broken. At now I start my CNC and I have always the same error message.

    Could you please help me with this problem?

    Thanks a lot.

    • Hi there! I think your problem may be similar to this post. Will you try following it?
      But it’s better to tell me your machine model, CNC model and other more information.

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