10/17/2023 12:25 PM | |
Joined: 9/27/2006 Last visit: 10/21/2024 Posts: 12290 Rating: (2688)
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Hello RiderA; I admit I am a little confused by your description. It appears that you are using a redundant (primary/backup) pair of CPUs. What model of CPU are you using, and what software package do you program them with? It would be easier to understand your Profibus topology with a sketch, showing slaves connected to the copper and fiber optic nodes. Just a a gut feeling, I would look at your termination switches on the first and last node on the network. If the last node does nor provide 24 V power to the terminator circuit (because it is disconnected, for example) the reflections are allowed to build in yhr network, causing the loss of certain nodes and possibly an increase in CPU processing time. Have s look at this article from PI International, discussing physical issues on Profibus networks: https://us.profinet.com/top-5-reasons-your-profibus-network-failed/ Hope this helps, Daniel Chartier |
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