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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 

 

• 

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.