OPC configuration error: cannot get server list. Operation returned"Null Pointer"

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lai 2014-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/126686-opc-configuration-error-cannot-get-server-list-operation-returned-null-pointer

评论： Luis Gualpa 2017-8-18

Matlab version 2012a. I opened a simulink model on my new windows 7 X64 computer. When I configurate the 'OPC configuration' block, the ERROR "IOPCCommon: class not registered" occurred. The OPC server was created by "CoDeSys OPC configurator"(CoDeSys is the programming software for ABB PLC). The OPC client test software "SOClient.exe" succed in connecting to the OPC server and so does one Chinese upper computer software "KingView". The Simulink model functions well on my old computer, with Windows 7 X32, Matlab 2012a. Then I try to creat a new model and add a new OPC server, an ERROR "can not get server list.Operation returned 'Null Pointer'" occurred.

Can someone tell me how to solve it? Thanks a lot.

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Answer 1

Muhammad 2014-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/126686-opc-configuration-error-cannot-get-server-list-operation-returned-null-pointer#answer_160191

I received the same error while trying to communicate MATLAB with WAGO PLC using KepServer. I have solved this problem by first initializing the OPC toolBox.

You have to write the following command in the workspace.

opcregister

After that, my problem is solved and server created on my laptop was picked up by OPC Configuration function block