Article - CS294815
The expected behavior of Device level system tag "_Error" in PTC Kepware Products
Modified: 12-Aug-2025
Applies To
- ThingWorx Kepware Server (legacy) 8.0 N/A to 6.17
- Kepware Server (formerly KEPServerEX) 5.21.236.0 to 6.17
Description
- How can I use the Device level system tag ._System._Error for monitoring device connectivity?
- What tag should I monitor for device alarms in Kepware?
- Is there a way to determine device connectivity?
- Customer use Channel.Device._System._Error tag to monitor connection to target OPC DA server and see inconsistent behavior with the tag
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