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plc comms issue

1529 Views 3 Replies 2 Participants Last post by  Noble 32
I am currently having an issue with 2 cmore screens coming from a slc 504. The comms is feed from dh+ to ethernet by a net eni card nd from there to a startix 8000. The issue is i will randomly lose comms to the screens due to plc time out. I can connect remotely to the screens so i know they are still on the network. Also i can see they are comunicating to the stratix.
It appears they drop out going to the plc from the NetEni.
This is a random thing and the fixes for it are random as well. Sometimes i can remove the power from the cmore and it starts working again sometimes i can remove the ethernet and same thing, it works. Most of the time though we have to leave it alone and it works itself out.
I am fairly good with program debugging and troubleshooting with the plc but networking was never my strongest suit. It seems to me that i am getting packet loss/data traffic jams when communicating between the stratix/plc.
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I fight the same problem you are describing, I described my problem to a Rockwell instructor a couple weeks ago, He didn't have any good advice for me other than to say that he thought was probably being caused by our SLC 5/05's and the way they handle data.
Sometimes it will communicate trouble free for months at a time, then we will have a bad week where it locks up daily. It's So Random.
We changed the way our messages were being done, it helped minimally.
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