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The variables are assigned to a PLC for the communication according to their bus-addresses. In the converter program you have to care, that this is defined correctly.

In the PDiag communication the S7 CPU is an active participant. The messages can be monitored with the menu entry CPU messages in the S7 Manager. Only the messages listed here are also available in the control system.

The PDiag messages are event-triggered and are generated by the S7 CPU. The messages get a time stamp from the PLC, i.e. the received and cleared time in the control system is the time from the PLC and not the time from zenon.


When converting the variable name is automatically generated. It consists of the following parts:


xx is the bus-address defined in the converter program


yyyyy is the message number of the PDiag message


this text is the monitoring defined in PDiag