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Is there any application or standard code through siemens that can monitor the ethernet comms on each side (or each individual PLC) to check that ehternet signal is functioning correctly. I was thinking of putting in a "Heartbeat" and checking for the returning siganl (i.e. to verify that the ethernet line is okay)with a timer hence if the signal does not change after approx. 3 seconds have each PLC go to a safe mode (close valves, stop pumps, etc) But was wondering if anyone has an alternative idea or something exists currently from siemens that could be "plug and run"-pharmaceutical application, and I am just trying to avoid the mountain of validation paperwork.