function_block Time_On_Off_Delay.txt

// This FB will delay the 

FUNCTION_BLOCK 	Time_on_off_delay 

VAR_INPUT
start_Input:	Bool;
stop_Input:		Bool;
time_on_dly:	Time;
time_off_dly:	Time; 
END_VAR

VAR_OUTPUT
output: bool;
END_VAR

VAR
Time_on_delay_1:	TON_TIME;
Time_of_delay_1:	TOF_TIME;
timer_trigger_0:	Bool;
timer_trigger_1:	Bool;
timer_trigger_2:	Bool;
END_VAR



// this block creates a start and  stop delay for an output.
// 

IF #start_Input AND NOT #stop_Input THEN
    #timer_trigger_0:= true;
END_IF;

IF #stop_Input THEN
    #timer_trigger_0 := false;
END_IF;

#IEC_Timer_0_Instance(IN:=#timer_trigger_0,
                      PT:=#time_on_dly,
                      Q=>#timer_trigger_1);



#IEC_Timer_0_Instance_1(IN:=#timer_trigger_1,
                        PT:=#time_off_dly,
                        Q=>#timer_trigger_2);


IF #timer_trigger_2 THEN
    #output := true;
ELSE
    #output:= false;
END_IF;