Historizing Trends Basics
Posted: 17 Oct 2022, 12:26
Hi!
I'm researching the use of the OPC UA communication protocol between a client and a Universal Robot model. I want to keep the setup as straightforward as possible and I have currently very limited knowledge about OPC UA besides basic configuration. Keep this in mind, please!
I have already an OPC UA server up and running (the robot is the server) and with a local program on the robot I can interact with some OPC variables I have created. The variables can be seen in real time in my PC via UAExpert.
Creating the OPC variables is done in the robot (basically you can set a name, type and value). I want to make a trend with one of the OPC variables (Boolean, True/False). I'm trying to use the History Trend View but I'm encountering an error where the program says: "Added item does not support historizing"
What could be the problem and what would be the easiest way to solve it?
I've tried to change the Historizing attribute in UserWriteMask (which is set to False) but "AccesDenied" and WriteNotSupported" errors show up in the Message Log.
Finally, I want to add that I have been able to plot a trend using another program, OPC Expert. No permission errors showed up there.
Thanks so much in advance.
I'm researching the use of the OPC UA communication protocol between a client and a Universal Robot model. I want to keep the setup as straightforward as possible and I have currently very limited knowledge about OPC UA besides basic configuration. Keep this in mind, please!
I have already an OPC UA server up and running (the robot is the server) and with a local program on the robot I can interact with some OPC variables I have created. The variables can be seen in real time in my PC via UAExpert.
Creating the OPC variables is done in the robot (basically you can set a name, type and value). I want to make a trend with one of the OPC variables (Boolean, True/False). I'm trying to use the History Trend View but I'm encountering an error where the program says: "Added item does not support historizing"
What could be the problem and what would be the easiest way to solve it?
I've tried to change the Historizing attribute in UserWriteMask (which is set to False) but "AccesDenied" and WriteNotSupported" errors show up in the Message Log.
Finally, I want to add that I have been able to plot a trend using another program, OPC Expert. No permission errors showed up there.
Thanks so much in advance.