Hello together,
within Node-RED I try to setup a subscription to an OPC-UA parameter. The datatype of the parameter is offered as "Extension Object".
Within UA-Expert testtool I am able to verify the object and the content of this object. There are 3 parameters defined within the object
- ID
- Name
- Description
During the test the values are filled with "ID=160" and "Name=Distanzhuelse" ... so they are not empty.
Example:
If I try to access this object using a NODE-RED flow I either choose the "Data Layer Request" of the "Data Layer Subscription".
Using the Subscription the operation fails with debug message "DL_FAILED"
Since the "ActiveTool" is the last node I can choose within the data structure I have exactly choosen this option.
If I work with READ / BROWSE Request instead, I receive an empty array as result.
But it's also not possible to access the parameters "Id", "Name" or "Description" as they are shown in UA Expert before.
Does anyone have an idea how I can access the parameters in this object or why the array is shown as "empty" even if there are currently parameters and values contained?
Thanks for your support!
Just to make things clear. You are connected with the ctrlX CORE - OPC UA client to a server on the network. Could you show us how the data looks like in the data layer viewer?
Which path did you enter in the subscription in Node-RED?
A Browse does show you an array of all registered sub nodes. If there is "only" a complex data object, there are no sub nodes registered eventually.
I did some tests subscribing to data objects in the data layer and it works fine see e.g. path framework/bundles:
There could be a problem with your data type.
After further investigation it seems that an "extension object" is currently not supported by the CtrlX. That's why the values (ID, name, description) are even not shown in the CtrlX Data Layer.
UAExpert:
Data Layer:
Hello @leonberger-m,
I just made a test with my version 1.20 system and it seem to work as you expected.
I connected my ctrlX UA client with a XM42 UA server (MTX system) and I see the structures inside the datalayer like I see them inside the UA-Expert. I tried it with some NC-Data (of the MTX)
and a PLC structure.
The link with the supported data types, Nick mentioned in his last post, refer to method calls. Method calls (right now) only support simple data types as input and output parameters. But this gap will be closed step by step with the next versions.
Best regards
Christian
As discussed, reading the extension object was not possible from already existing node-red features, and to solve this issue, one needs to install the "node-red-contrib-opcua" pallet manually by offline installation. Installation file could be requested from the respective customer representative.
configuration description could be found at below links:
Video: https://www.youtube.com/watch?v=S4GO63r_8Co&ab_channel=CLMechatronics
Links: https://github.com/mikakaraila/node-red-contrib-opcua
https://flows.nodered.org/node/node-red-contrib-opcua
https://github.com/mikakaraila/node-red-contrib-opcua/issues/298
Hello @leonberger-m,
I don't know what @kuldeepM is trying to say.
I just tested it together with @NoRisk4Project. We did a subscription to a structure from the OPC UA client in the Data Layer. This worked without an issue.
We used V1.20 of the ctrlX System Apps and also of all Application Apps (OPC UA Client and Node Red). Maybe this could be the issue for you, can you also try with the newest versions?
Best regards,
Nick
Hello @smueller ,
thanks for your answer. We are looking for the upcoming version 2.4 - that's great.
Regarding your question.
For the second issue it seems to be real "localized text" - so should be supported soon:
Forum: Supported data structures - Bosch Shared (boschrexroth.com)
As shown in the screenshot (UA expert output) the data type is "LocalizedText"
For the original question of this post the datatype is different.
It seems to be a kind of array and the data type is named "ActiveToolDataStructure" within UA expert.
When we discussed this issue earlier someone of your colleagues mentioned that this is a former version of the "extension object" what is currently not supported by the released CtrlX version.
But maybe supported soon? Could you also give me some information about this kind of data type?
In the next screen the same parameter is shown when accessing over the CtrlX opcuaclient.
Best regards
Markus
Hi @leonberger-m,
for me it looks like that the fields of "Name" and "Description" are also from DataType "LocalizedText". Therefore please read out the DataType-NodeId "ns=2;i=3009" on your server.
The Attribute "DataTypeDefinition" should be shown with corresponding fields then. There please look at [1] and [2] what the DataType it is? Here as a example how it looks like for the BuildInfo Struture in our Server:
Best regards,
smueller
Hello @smueller ,
today we were able to verify the settings for [1] and [2]. It really seems to be "localized Text" as well. So we are waiting for new app version 2.4.
Is there already an information when the new version 2.4 will be released?
BR Markus
Hello @CodeShepherd ,
we have tested the file access with the current release 2.4 / 2.6.
Now it seems to work fine!
Best regards
Markus