//获取上升沿

#PF_button1 := #button_1 AND NOT #M_button1;

#M_button1 := #button_1;

//楼层已选中时有按钮信号启动定时器

IF #selected AND #PF_button1

THEN

    #startTON := TRUE;

ELSIF "IEC_Timer_0_DB_2".Q 

THEN   

    #startTON := FALSE;  

END_IF;

//定时器时间内再次接收到按钮信号复位楼层选中

IF #PF_button1 AND NOT #selected   

THEN

    #selected := TRUE; 

ELSIF #startTON AND #PF_button1 AND "IEC_Timer_0_DB_2".ET > T#1ms  

THEN  

    #selected := FALSE;    

END_IF;

//定时器

"IEC_Timer_0_DB_2".TON(IN := #startTON,

                       PT := T#1s);