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:
In the Monitoring Enabled? list, select Disabled.
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.