OPC UA freezing problem

Hi Timo ,

Driver debugging is best handled by AVEVA Customer Support. I'd recommend reaching out to them.

There are debugging parameters to help understand what issues are occurring. See the opcua.chm file for details.

[OPCUA]

DebugLevel

DebugCategory

DebugUnits

It could be a physical connection problem or the OPCUA Server rejecting messages? It is hard to know.

Hi,

Support noticed this incident (or did you provide a hint?) and they made this as a support case.

The problem was solved with two additions to the OPC UA I/O-device configuration:

Background Poll --> TRUE

Min Update Rate --> 00:00:05

Finally, I updated the Citect TCP driver, and the last little problem was fixed.

Thanks.

Good to know your problem has been resolved. Just curious, are you using the encrypted communication in this OPC UA protocol?

No encryption. We try to keep things simple if it’s safe.

Thanks Timo. So, we can eliminate the encryption that caused the original problem. Enabling the backrgound poll means that once an OPC UA  variable tag is subscribed, it will be changed to the "Reporting" mode and always in that mode until the session ends. Without the background poll, those tags on a page will be changed to the "Disabled" mode when you are navigating away from this page. I suspect that the server may not handle well the frequent changes of monitoring modes, especially for those tags with "static" values.

Thanks Timo. So, we can eliminate the encryption that caused the original problem. Enabling the backrgound poll means that once an OPC UA  variable tag is subscribed, it will be changed to the "Reporting" mode and always in that mode until the session ends. Without the background poll, those tags on a page will be changed to the "Disabled" mode when you are navigating away from this page. I suspect that the server may not handle well the frequent changes of monitoring modes, especially for those tags with "static" values.