
erice
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/getLiveData timestamps
I am reading live data of tags that are in the same group and have a sample time of 1 sec in the OPC collector. When I read the live data I get some .5 second intervals (which seems odd since the OPC…
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Duplicate the chart export functionality with Web Read API
Trying to duplicate the chart 'Export' data functionality with the read api. I am using python with the requests library. I have tried both raw data and processed data,…
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Write API issue
I am able to write data to the Canary Historian, but as soon as the session token is revoked (either by timeout or by revokeSessionToken) a 'No Value' value is written with 'No Data' quality.…
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Calcs and Events - Latch value
I have a complex event trigger that I am having difficulty programming. I have a trigger that when the length has been reset (Previous length > current length - which we'll call A) and then the…
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Quality of PreviousValue
Is there a way to get the quality of the PreviousValue of a tag in Calc and Events. I try to use Quality('PreviousValue('[tag]')'), but I get an error for this.
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OPC Collector receives Bad when OPC Server shows Good
I have an issue where the OPC Collector is showing No Data even though the OPC server shows Good data. The value in the Historian maintains, but the View will show Empty.…