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Kepware Knowledge Base: Solution


How Do I Get the Server Communications Status When I Cannot Locate the Status Tag?


Last Update: 2018/11/7

The Wonderware Status Tag is specific to Wonderware drivers. Kepware provides a similar tag called _NoError that is available for each device. It has a value of 1 when communications are good, and a value of 0 when there is an error. When a communications error occurs, additional information will be available in the server Event Log. The tag's address within the device topic is "_System._NoError". The fully-qualified OPC tag address is "ChannelName.DeviceName._System._NoError".


Note:
Server versions 4.180.338 and earlier do not have the _NoError Tag. To obtain this tag, download the free server upgrade from www.kepware.com. Otherwise, use the _Error Tag instead; this tag is available in all versions of KEPServerEX. The _Error Tag has a value of 0 when communications are good, and a value of 1 when there is an error. The tag's address within the device topic is "_System._Error".

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KEPServerEX