When a tag is enabled, the limits, deadbands, and other values can be edited. However, in order to make any changes to a Tag Name, Data source, and Data source tag, the monitoring must be disabled.
To disable the monitoring:
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Click Edit
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In the Monitoring Enabled? list, select Disabled.
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Click Save
After making the necessary changes, enable the monitoring again.
The Variable Type and Data Type can't be edited after a tag is saved, even when the monitoring is disabled.