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What happens to the internal profinet switch when a PLC stops?

4/8/2014 5:24 PM	Rate (0)
VictorClaessen Member Joined: 2/5/2014 Last visit: 12/3/2024 Posts: 1 Rating: (0)	Hi, Our setup has two PLCs (ET200S - 6ES7151-8AB00-0AB0) - I will call them A and B - that communicate via profinet. Both those PLCs are connected to the internal profinet switch of PLC C (ET200S - 6ES7151-3BA23-0AB0). A is also connected to the rest of the network. We are experiencing communication errors between A and B from time to time. When such an event happens, we walk down into the basement to our PLCs and we find that: 1) All the LEDS on the CPU of PLC C are blinking so I assume it is in stop mode, and has to be reset 2) The diagnostic buffer of PLC A reports that it could not communicate with PLC B. I am now wondering if the first (PLC C stops) is causing the second (PLC A can't communicate to PLC B). My questions are: what happens to the internal profinet switch of PLC C when C stops? Will that keep working? Should A and B still be able to communicate - in theory? Thanks for your time, Victor

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4/9/2014 4:10 PM	Rate (0)
Owei Gold Member Joined: 10/1/2013 Last visit: 3/21/2025 Posts: 605 Rating: (71)	Yes.
	Last edited by: Owei at: 09.04.2014 16:25 Last edited by: Owei at: 09.04.2014 16:23
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4/9/2014 6:23 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 3/4/2025 Posts: 728 Rating: (43)	Hi, I think when all lights are blinking you have an error, not just a stopped CPU.. As long as you have power the switch should be working, but unsure what happens if the CPU goes into error mode..

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