When on, the tag can be monitored. When off, it is left out of monitoring.
The Save button stays red until the form is complete and correct, and turns green when it is ready. Tap Save to add the tag. If anything is missing, the message Please fill in the required fields, you may need to scroll down appears.
Give every tag on a controller its own name. Two tags with the same name are both saved, but only one of them is read.
