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4.1.13 Alarm Handler Function
The alarm handler is a time event handler that is started only once at a specified time.
Use of the alarm handler makes it possible to perform time-dependent processing. The time of day is specified by a relative
time. Figure 4.23 shows a typical operation of the alarm handler.
Alarm handler
created
Activation
time
Start
operating
Stop
operating
Handler does
not start
Handler starts
Start
operating
Activation
time
Figure 4.23 Typical operation of the alarm handler
• Start Alarm Handler Operation (sta_alm, ista_alm)
Causes the alarm handler with the specified ID to operational state.
• Stop alarm Handler Operation (stp_alm, istp_alm)
Causes the alarm handler with the specified ID to non-operational state.
• Reference Alarm Handler Status (ref_alm, iref_alm)
Refers to the status of the alarm handler. The operating status of the target alarm handler and the remaining time
before it starts are inspected.