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Chris Elston

Disconnecting Remote Flex I/O while system hot

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Has anyone ever powered down a rack of Flex I/O module while the scanner card is still running? I have a SLC 5/04 with an SN card. I have three racks of Flex I/O Rack 1 Rack 2 Rack 3 Rack 2 let's say is in a panel with it's own 24 VDC power. If rack 2 gets powered down (disconnect off), while the scanner is still scanning, and rack 1 and rack 3 are still alive....what does that do to my network? Will rack 1 and rack 3 still scan I/O and the SLC still run logic even though rack 2 is powered down? How does the scanner react to this? Does it fault? Can I write logic in my PLC to ignore the dead rack until the power is restored to the rack 2?

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Rack 1 and 3 should still get scanned as long as there are no breakage to the rio cable. You can get fault status of all the configured racks in the M1 file.

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You'll get a rack fault, but your logic will still continue to execute unless you put in something to check the status bits. We typically would drop out reset on a rack fault.

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