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Author Topic: Using $LastScan to see if a DM is in run mode.  (Read 5777 times)

Henryp

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Using $LastScan to see if a DM is in run mode.
« on: October 03, 2018, 07:29:25 PM »
Hi,
I'm using $LastScan to reset a Modbus coil so I can read if my PLC is in run mode. The PLC had an I/O error and the coil didn't reset. Does $LastScan not go true on an I/O fault? Attached is a screen print.
Thank you
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BobO

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Re: Using $LastScan to see if a DM is in run mode.
« Reply #1 on: October 04, 2018, 12:23:47 AM »
I/O faults are fatal errors, and currently all fatal errors shut down hard. I guess there really is no reason we can't treat I/O errors a little more gently though, and do the $LastScan.
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