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Sgilk · ‎09-19-2023

OPC UA is definitely a valid solution. You just can't expect real-time behavior. Generally, this should be sufficient for an HMI application like you are describing. REST API would have similar performance here. You could also implement datalayer communication via the SDK for the ctrlX hardware and some other solution for Siemens PLC.

Sgilk · ‎09-14-2023

What kind of response time are you looking for? There are some configurable paramaters on the OPC UA Server side but I don't think they will help you here. As a non-real time communication method you shouldn't expect <50ms latency. My suggestion would be to go direct to the datalayer if possible. That will remove the OPC UA server-client latency. See: Python Datalayer Client If you would like true real-time, you will need to implement this in C++ See: Datalayer Realtime

Sgilk · ‎09-13-2023

If you have SSH access, I'd suggest restarting your snap and watching the logs on startup. Ex: sudo snap restart ctrlx-node-red; sudo snap logs -f ctrlx-node-red

Sgilk · ‎09-12-2023

In the logs I see the first error to come through is actually on a datalayer request node. How is this configured? info;2023-09-12T13:07:15.487048+02:00;;;;12 Sep 13:07:15 - [error] [ctrlx-datalayer-request:ReadStatus] Error: socket hang up;;;snap.ctrlx-node-red.node-red.service;

Sgilk · ‎09-12-2023

Are the variables defined in a CODESYS symbol configuration file in the PLC? Can you view these variables in the datalayer browser of the ctrlX WebUI? Can you give me an example of the subscription path to your PLC variables? Another possibility is https session expiration, although it seems your errors are only ~20 mins apart and I'm not seeing that exact message in the logs. Subscription node emits an Server closed connection error every x hours This happens, when the authorization token of the https session expires. A new connection with a new token will be established within a few seconds. If you do not want this to happen, then change the session timeout in the session policies. You can find this in the ctrlX CORE settings under "Settings" -> "Users & Permissions" -> "Session policies".

About Sgilk

Re: OPC UA Communication response time

Re: OPC UA Communication response time

Re: The AMD64 snap is working on virtual core but ARM64 snap not on the core

Re: Node-RED sporadic DL_INVALID_ADDRESS

Re: Node-RED sporadic DL_INVALID_ADDRESS