Put/Get using S7 Connection Status

boneless · Apr 10, 2018

Hi all!

Trying to figure out if it is possible to monitor connection status in my program (like device status). We generally use our own watchdog, but was wondering if there is a standard.

Thanks!

Lare · Apr 10, 2018

You can look NDR, done and error outputs and make communication counters.
one of these bits are true for one PLC scan after message is maded.

boneless · Apr 10, 2018

Hi, yes we could do that, but was hoping for a system function(block).

baref00t25 · Apr 10, 2018

I like to pass a clock value, then if it hasn't changed then you know your communications have gone down.

boneless · Apr 10, 2018

Yeah we do something similar, it is pretty simple. But my co-worker was sure he had seen a standard block at a seminar.

cardosocea · Apr 10, 2018

PUT and GET should always carry a heartbeat or rolling counter as the instruction functions even when the partner PLC is in stop. It's not the end of the world not having one, but it's good practice.

Put/Get using S7 Connection Status

boneless

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Lare

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boneless

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baref00t25

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boneless

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cardosocea

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