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labviewopc-ua

Labview: error in accessing server addres space

I am trying to access the server address space and I am getting this Error.

LabVIEW: (Hex 0xFFFA8EBB) The node path refers to a node that does not exist in the server address space

The server is on a Plc and I am connected via Lan. the information i have is

Server-URL: opc.tcp://192.168.1.135:4840

enter image description here

Namespace-URI: urn:B&R/pv/

I have tried different things but i am not sure how to access the variables in address space. any suggestions would be helpful

Solution

  • B&R Publishes the Endpoints of your data in a fairly consistent manner. If you use a OPC UA browsing tool, you will find that the address space visible to Labview should start with

    PLC.Modules.<Default>

    B&R Automation Studio requires that you complete the default OPC UA configuration. Within that configuration you would need to enable the nodes/endpoints in question. You can then access these nodes in Labview.

    You should check the following:

    • Under your controller, confirm that you have enabled OPC UA in the configuration view.
    • Next, check that you have added a OPC UA Default View File to your configuration for the hardware you are running.
    • Finally, in that file, ensure that you have enabled the endpoint/variable and that it has at least the read permission. The quickest and most expedient way is to ensure that you have gone to the top level of the OPC UA Default View File and added the Everyone role and that Read is enabled. This will cascade down to all enabled endpoints.

    Save this and make sure it has been built and added to your controller. You should be able to access endpoints then.

    For example, if I have a program called "LampController" running in B&R with a variable called switchState it would be addressed by:

    PLC.Modules.<Default>.LampController.switchState