CODESYS - the IEC 61131-3 automation software

OPC-UA Client connection, Linux SL /Raspberry Pi
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Author:  Liquidea [ Wed Sep 12, 2018 11:22 am ]
Post subject:  OPC-UA Client connection, Linux SL /Raspberry Pi


I'm testing a Linux SL runtime with OPC-UA server enabled (v3.5.13.0) in a virtual machine (Debian 9, x64).
When I try to connect to it with a OPC client (UAExpert v1.4.4) , I get the next error 'BadCommunicationError'.

I noticed that the configuration looks a lot like the configuration used with the RaspberryPi.
So I took a Pi to test the same application.
I edited the file /etc/CODESYSControl.cfg on both machines where I added the following;
NetworkAdapter=[systemname of network adapter, like eth0 or ensXX]

After editing and several attempts of rebooting and stopping and starting Codesys on both machines with the following commands;
/etc/init.d/codesyscontrol stop
/etc/init.d/codesyscontrol start
no noticeable effect has been seen in my case.

I also tried running the application on Win SL runtime, no problems there.
Besides that I'v scanned the network interfaces using nmap, the ports 4840 are open.
At the moment I'm running out of ideas to do further analysis and find a solution for communicating with the OPCUA servers.
Can anyone help me with this / Is there anyone out there experiencing the same problem?

Author:  Edwin Schwellinger [ Wed Sep 12, 2018 1:26 pm ]
Post subject:  Re: OPC-UA Client connection, Linux SL /Raspberry Pi


This effect can occur if the hostnames of the Linux systems cannot be resolved by Windows via DNS. The GetEndpoints returns the URL with hostnames. If it cannot be resolved, then no connection is possible.
Workaround(see screenshot):
The network adapter is no longer configured under [CmpOPCUA], but under [CmpOPCUAServer].


Author:  Liquidea [ Mon Oct 08, 2018 11:04 am ]
Post subject:  Re: OPC-UA Client connection, Linux SL /Raspberry Pi

Hello Edwin,

It works perfectly!! :D :D
Thanks for your reply.


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