OPC UA - can't read Tag values

[aziliotto]

Hi,

I'm trying to connect to an OPC Server simulator with OPC UA protocol. I've downloaded from the marketplace the extension, followed the guide but from thingworx composer i can't read my property "Counter" but i can see it trought the menu manage bindings. from the log of microserver seems to be all ok, i have remote thing connected but i have the property "ConnectedToOPCUAEndpoint" set to false. I'm using the Kepware OPC Server simulator and with another OPC Ua client it works, so the server is ok, i set up no security for connection.

Maybe is fault of namespaceIndex (Channel1 has index 1)? i think it is 1 right ?

[Aanjan]

Alberto, when you said you can see it through 'Manage Bindings', have you bound that to an existing (or a new) property? Do they not change/ update there?

[aginal]

Hi guys!

We have similar problems with the Thingworx OPC UA Client. For some reason this client constantly reconnects to the KEPServer. In the KEPServer EX Runtime I can see the number of connected clients increase every couple of seconds. I have a feeling that this is not the normal behaviour so maybe this is what causes the problem with reading the Tag values.

@Alberto: Did you try changing the baseType to INTEGER? In ThingWorx the NUMBER baseType is used for floating point numbers. Based on the name "Counter" I guess this Tag1 is an integer type.

[aziliotto]

Thanks Alberto for reply,

Yes i've tried to change the base type to integer but nothng changed.

@Aanjan yes i've tried but seems using "remote things" template properties not update itselve. anyone is at liveworx next days ?

[aginal]

Hi Alberto, I finally figured out why I could not read the Tag values, maybe the problem is the same for you too.

The main problem was that the namespaceIndex was not correct, I used the following configuration for the opcua_subscription:

"opcua_subscription": {

    "dataItems" : [

    {

         "name" : "Counter1",

         "baseType" : "INTEGER",

         "identifier" : "Channel1.Device1.Tag1",

         "namespaceIndex" : 2,

         "isReadOnly" : false

    } ]

}

The identifier needs to be the complete path of the tag for example: "Channel1.Device1.Tag1" and the namespace index in my case was 2 (it is probably the same for you as well)

You can check for the correct namespaceIndex using the UAExpert tool. It can be downloaded from the following link: OPC UA Clients - Unified Automation

I hope this will be helpful.

[aziliotto]

Hi, thanks,

with this simulator all worx but with old Kepware simulator didn't work. Now they are partner so i think things are changed ! i will try soon to connect with kepserver !