KepServerEx _Error tag not showing error when network cable unplugged


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I'm using KepServerEx V5 with Allen-Bradley ControlLogix Ethernet driver. I am trying to use the _System._Error and _System._NoError tags to indicate that the connection is OK.

If I disconnect the network cable at the PLC all the data point tag values show Quality = 'bad' but the _System variables don't change and, in particular, the _Error / _NoError bits don't change.

Any ideas?