Reply To: PLC going offline at similar intervals

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I had a similar issue on a Control Logix PLC a few years back.  In my case it was talking to a Wonderware system.  Long story short I had to install a firmware upgrade to the Ethernet module and had to install a DAS server patch in order to clear this problem up.

I recommend looking at the firmware that you are using on the Compact Logix and then the revision of whatever it is that you are interfacing to and digging in to see if there are any issues with the particular combination.  You may need to upgrade both the firmware of the PLC and the comm link software of whatever you are interfacing to.