Connect matlab to OPC UA server

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Giorgos Stefos
Giorgos Stefos 2017-2-2
回答： Thomas Pursche 2022-7-18
Hello, I have a problem connecting matlab with Codesys OPC UA server. I am running codesys opc ua server to a Beaglebon platfrom , and I have connected with my modem via ethernet. The server is running ok because i can connect to it with other OPC UA clients , but when it comes to matlab i am seeing the following error:
ua=opcua('192.168.1.6',51210);
connect(ua);
Error using opc.ua.Client/fetchEndpoints (line 625)
A low level communication error occurred.
Error in opc.ua.Client/connect (line 409)
errorCode = clnt.fetchEndpoints;
Also when i' m gonna request server info with h=opcuaserverinfo('192.168.1.6') , i am getting the error:
Error using opcuadiscoverymex
Requested 1x18446744073709551615 (17179869184.0GB) array exceeds maximum array size preference. Creation of arrays greater
than this limit may take a long time and cause MATLAB to become unresponsive. See array size limit or preference panel for
more information.
Error in opc.ua.getServerInfo (line 49)
[serverEndpoints, errorCode] = opc.internal.opcuadiscoverymex('getEndpointConfig', listOfServers(k).DiscoveryUrl);
Error in opcuaserverinfo (line 29)
s = opc.ua.getServerInfo(hostName);
Please help me, any ideas?
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Anwesh Reddy Gottu Mukkula
Anwesh Reddy Gottu Mukkula 2017-5-2
I have the same problem. I am able connect to the OPC server if its located on the same machine. However, I am not able to connect to the OPC server if it is located on a different machine withing the network. Thanks. Any help would be appreciated !!
Reyhane Mokhtarname
Reyhane Mokhtarname 2020-9-24
I have exactly the same problem.
Did you find any solution guys?

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回答（4 个）

Felix Bertelsmeier
Felix Bertelsmeier 2017-3-29
Hello Giorgos,
I have the same Problem, did you find a solution?
Best regards
Felix
Rodney Busquim e Silva
Hello, I am having the same problem - did you guys find a solution ? Thanks.
Ali Fotouhi
Ali Fotouhi 2019-11-25
Hello,
I face the same probelm.
connect(UaClient)
Error using opc.ua.Client/fetchEndpoints (line 627)
A low level communication error occurred. Ensure that server host is reachable.
Error in opc.ua.Client/connect (line 417)
errorCode = clnt.fetchEndpoints;
I would like to know if anyone has a found a solution for this problem.
Thanks.
Thomas Pursche
Thomas Pursche 2022-7-18
Hello together,
I had a similar problem. It seems that maybe at the moment Matlab is only able to connect to OPC servers running on the same system. This means 'localhost' is running but an OPC server from another machine is not able to be contacted. The problem is maybe not only Matlab solitary but also some security settings.
I have tried to start Matlab under Admin user which helped in my case when using a connection to a database.
Best regards,
Thomas

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