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In the I/O Assignment window, select the control system tag that you want to delete.
You can select the required control system tag in the Tag coupling or in the Channel assignment pane. If, in the Channel assignment pane, you select a CS tag that is still coupled with an instrument, the software informs you that the I/O assignment for that channel will be canceled.
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Select Actions > Delete Control System Tag .
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Select Yes to confirm the deletion.