Check the PLC State through OPC UA Server | OPC UA Implementation: Stacks, Tools, and Samples | Forum

Check the PLC State through OPC UA Server

Yiming Sun

Germany

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10/04/2021

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02/21/2022 - 08:27

Hello, I'm using OPC UA Client in a WPF UI to get all necessary datas from Beckoff PLC (TwinCAT 3) through OPC UA Server.

Is there any method in the library that I could use to check the PLC State (online, offline, Run Mode/ Config Mode) at a certain frequence?

I know there are Variables that can be monitored, their value being checked every certain milliseconds.

Can I checking the PLC State by monitoring a variable in the PLC?

Namely, if the StatusCode of a variable is bad, then it means PLC is not online / not running, if the StatusCode is good, it means PLC is online.

Or is there a better way? Thanks in advance. Smile

Randy Armstrong

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02/22/2022 - 11:24

The open source code base includes code that monitors the connection and reports events if there is a problem:

public event KeepAliveEventHandler KeepAlive

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