OPC UA subscription event is triggered without data change|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

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OPC UA subscription event is triggered without data change
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David Steiner
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07/12/2022 - 22:13
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I have a basic app (for testing purposes) in which are about 150 subscription monitored items. Sometimes when i start my app I keep getting monitored item events for data change, but the data is always the same. Does anyone have a clue why this is happening ?

Subscription PublishingInterval is set to 1000, monitored item mode is set to reporting, SamplingInterval is set to 1000 and QueueSize is 0.

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Randy Armstrong
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07/13/2022 - 10:04
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does that status code change? or the timestamp?

is it only with one server?

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David Steiner
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07/13/2022 - 21:44
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Randy Armstrong said
does that status code change? or the timestamp?

is it only with one server?

  

Status changes from Good to GoodOverload, timestamp stays the same 

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Randy Armstrong
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07/14/2022 - 04:56
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Update on StatusCode change is mandatory behaviour:

https://reference.opcfoundatio…..art4/7.10/

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David Steiner
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07/14/2022 - 22:26
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Randy Armstrong said
Update on StatusCode change is mandatory behaviour:

https://reference.opcfoundatio…..art4/7.10/

  

Is it possible to receive just the actual value change ? 

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Randy Armstrong
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07/15/2022 - 05:28
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No. StatusCode changes are critically important. Applications that ignore them are setting themselves up for serious problems in the field.

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