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The OPC-UA subscription publishing has stopped.
14 Jun 2016 12:20 #4138
by Erik
Replied by Erik on topic The OPC-UA subscription publishing has stopped.
Hello,
Thank you for your response! I will contact Rexroth and forward the information.
I have some questions that may help in guiding the investigation:
A. What is the CPU usage on the client side?
B. What is your code doing in the event handler for data changes? Is it just manipulating in-memory data, or is it e.g. writing files, communicaing with the database, - or what it is doing? Is there a possibility that it requires relatively long time to complete? (compared with the rate of incoming changes?)
Attached is an image of the windows task manager performance tab. Outside of the task manager start up spike the PC is pretty much in idle state.
You can also see what we do with the information. We get the values and put them in simple user controls like TextBoxes and Labels. We have write actions behind the buttons and the ink train colors change depending on the integer value received. There is no writing to files and no direct database connection.
In fact, the subscription loss seems to occur at complete random. We have been unable to pinpoint a specific task (either on the PLC or our HMI) that would cause the problem.
If the above sounds/looks wrong in any way I would appreciate any feedback you can give me.
One of our next steps will include checking the network itself (cables/routers/etc). We will then also do another Wireshark capture and report back. Our hope is to do this together with Rexroth for direct feedback.
I thank you for your time and look forward to your reply,
Erik
Thank you for your response! I will contact Rexroth and forward the information.
I have some questions that may help in guiding the investigation:
A. What is the CPU usage on the client side?
B. What is your code doing in the event handler for data changes? Is it just manipulating in-memory data, or is it e.g. writing files, communicaing with the database, - or what it is doing? Is there a possibility that it requires relatively long time to complete? (compared with the rate of incoming changes?)
Attached is an image of the windows task manager performance tab. Outside of the task manager start up spike the PC is pretty much in idle state.
You can also see what we do with the information. We get the values and put them in simple user controls like TextBoxes and Labels. We have write actions behind the buttons and the ink train colors change depending on the integer value received. There is no writing to files and no direct database connection.
In fact, the subscription loss seems to occur at complete random. We have been unable to pinpoint a specific task (either on the PLC or our HMI) that would cause the problem.
If the above sounds/looks wrong in any way I would appreciate any feedback you can give me.
One of our next steps will include checking the network itself (cables/routers/etc). We will then also do another Wireshark capture and report back. Our hope is to do this together with Rexroth for direct feedback.
I thank you for your time and look forward to your reply,
Erik
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