Troubleshooting PROFINET

Using the Event Log

The Event Log is the primary troubleshooting tool in the RMC for PROFINET I/O. It will report each time a PROFINET I/O connection is opened or closed and report errors with the connection as well. It can also record every change in the incoming (consumed) PROFINET I/O data (the Output Data from the PLC). It does not record the outgoing data sent by the RMC (the Input Data in the PLC).

The Event Log can report the following events based on Incoming I/O Data:

Initial Data
This entry is logged only if the Sync Register is used and the Ethernet I/O Logging filter option for the Event Log is set to All. It is reported when the first incoming I/O data is received after a new controlling I/O connection is established, showing both the data and the value of the Sync In register. Notice that the data is not yet applied to the RMC.
Data Changed
This entry is logged only if the Sync Register is used and the Ethernet I/O Logging filter option for the Event Log is set to All. It is reported when any Incoming I/O Data register has changed, but the Sync In register has not. This entry shows both the data and the value of the Sync In register. Notice that the data is not yet applied to the RMC.
Request Made
This entry is logged each time the incoming I/O data is applied to the RMC. If the Sync Register is used, then this is each time the Sync In register changes. If the Sync Register is not used, then this occurs when the I/O data is first received, and each time after that when any register in the Incoming Data changes. This log entry will be shown by default, but can be disabled by setting the Ethernet I/O Logging filter option for the Event Log is set to None.

Using the Communications Statistics

To open the Communication Statistics window, in the Project Pane, select the desired controller. On the Controller menu, choose View Communication Statistics.

The Communications Statistics window provides information on open PROFINET I/O connections, including producing and consuming registers and the update time. The statistics also provide advanced information on the Ethernet traffic.