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OPC client cannot get value

There is a remote Matrikon OPC server.  Labview and DSC was installed on another PC(win7). 


In the LV project, a OPC client can be created and link to the remote OPC server. Items can be binded to shared variables. When run the vi with shared variables on the front panel. The tiny green triangle for each shared variable appear.


But the value of each shared variable is always 0. While the MatrikonOPCexplorer can link to remote server and refresh value automatically.


Any suggestion, thanks.

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