Python code is not able to write on PI Tag through PI Web API.

I am able to fetch data for Python from PI, but I am not able to write back to the PI tag using PI Web API.

I checked the configuration of PI Web and it is correct. but I have a warning in the windows event log.

I tried to add X-Requested-With to the CorsHeaders.

It seems there is an issue with the certificate, although I checked in the PI Web Utility and everything seems okay, I also added the certificate file to the Trusted Root Certificate Authorities on my own desktop.

I am not sure what is the issue.

0 Mike horrocks over 1 year ago

If you're able to read data but not write data it suggests that the problem is that the connection you have to PI doesn't have the appropriate permissions.
It would be worth checking to see what identity you are getting connected to the PI Data Archive as, and checking its permissions against the PI point you're attempted to write to.
There is also an option in the PI Web API to disable write, this could also be the reason. (see https://docs.aveva.com/bundle/pi-web-api/page/1023027.html)
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