An alarm only [JSup tag|tag] can only be used for its [JSup tag alarms|alarm] by the [JSup Alarm system|alarm system].

An alarm only [JSup tag|tag]:

• Has to be [JSup Read only tags|read only] also.
• Must have a single read-only [IOHook|I/O hook].

No [JSup Code|code] or [JSup Animations|animation] can read or write the value of an alarm only [JSup tag|tag].

The advantage of using alarm only [JSup tag|tags] is their low cost for [JSup licence|licence] I/O tag count.
Indeed an alarm only [JSup tag|tag] count only an 1/8th of an I/O tag for [JSup licence|licence] limitation.
So an alarm collecting/recording [JSup application] would be very cheap, because every 8 alarm only [JSup tag|tags] only one I/O tag is counted for [JSup licence|licence] I/O limitation.