Read/Write OPC I/O Type

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Greetings, I'm doing a project based on OPC server. I´ve created the channels for obtaining variables by opc server but when I select the type of i / o, I can only choose between reading or writing.

Is it not possible to select a type of I / O read / write at the same time?

I need the same tag to be able to read and write on the same variable of the opc server.

I´ll wait for your answer, thank you and happy day.

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