Unable to connect to python OPC UA server

sasasaxax · February 27, 2023, 3:58pm

I have set up a OPC server using the python minimal server for the OPC UA on github. This is the message show when the correct address is entered.
“object reference not set to an instance”.
Please assist me on resolving this issue

github.com

FreeOpcUa/python-opcua/blob/master/examples/server-minimal.py

import sys
sys.path.insert(0, "..")
import time


from opcua import ua, Server


if __name__ == "__main__":

    # setup our server
    server = Server()
    server.set_endpoint("opc.tcp://0.0.0.0:4840/freeopcua/server/")

    # setup our own namespace, not really necessary but should as spec
    uri = "http://examples.freeopcua.github.io"
    idx = server.register_namespace(uri)

    # get Objects node, this is where we should put our nodes
    objects = server.get_objects_node()

This file has been truncated. show original

brunovgr · February 27, 2023, 5:18pm

Hi,

Try to set an IP address rather than 0.0.0.0 as the server endpoint, such as 127.0.0.1. Next, copy and paste (or type) the server endpoint into the OPC Server field in Factory I/O. Press Return to connect. Please let me know if this works for you.

Topic		Replies	Views
OPC Client DA/UA can't connect to server Drivers	3	3351	October 26, 2020
Opc client da/ua error establishing a connection: 11001 Drivers	4	1918	October 30, 2021
OPC Client DA/UA can’t connect to node-red-contrib-opcua server Drivers	10	4357	December 18, 2020
Not able to connect to Prosys OPC UA running on Azure VM Drivers	2	855	March 12, 2021
Node-opcua server	8	1993	July 7, 2020

Unable to connect to python OPC UA server

Related Topics