Need help with small program

[Ayejay]

Hi all,
I’m new to programming and want to write a simple routine.
Push start button, turns on sensor.
2 second delay before anymore logic read.
When sensor is triggered alarm 1 sounds for 5 seconds then alarm 2
Sounds for 5 seconds.
Then reset and wait for start button.

This is what I have done but not quite right


IF _IO_EM_DI_00 THEN

_IO_EM_DO_00 := TRUE;

TIMER_DELAY(IN := TRUE);

END_IF;



IF TIMER_DELAY.Q THEN

IF _IO_EM_DI_01 THEN

_IO_EM_DO_01 := TRUE;

TIMER_ALARM1(IN := _IO_EM_DO_01);

END_IF;



IF TIMER_ALARM1.Q THEN

_IO_EM_DO_01 := FALSE;

_IO_EM_DO_02 := TRUE;

TIMER_ALARM2(IN := _IO_EM_DO_02);

END_IF;



IF TIMER_ALARM2.Q THEN

_IO_EM_DO_02 := FALSE;

RESETSYSTEM := TRUE;

END_IF;



IF RESETSYSTEM THEN

_IO_EM_DO_00 := FALSE;

_IO_EM_DO_01 := FALSE;

_IO_EM_DO_02 := FALSE;

END_IF;

END_IF;

 

[drbitboy]

Read the red statements in order: (1); (2); (3); (4); (5).

if _io_em_di_00 then

    _io_em_do_00 := true;

    timer_delay(in := true);

end_if;



if timer_delay.q then



    if _io_em_di_01 then

        _io_em_do_01 := true;

        timer_alarm1(in := _io_em_do_01);    <= (3) which will reset timer_alarm1, and timer_alarm1 value will be 0

    end_if;



     if timer_alarm1.q then          <= (1) when timer_alarm1.q becomes 1,

                                <= (4) so this IF will no longer evaluate to True



         _io_em_do_01 := false;      <= (2) _io_em_do_01 will be assigned a value of 0

        _io_em_do_02 := true;

        timer_alarm2(in := _io_em_do_02);    <= (5) and timer_alarm2 will no longer be evaluated and will never expire

    end_if;



    if timer_alarm2.q then

        _io_em_do_02 := false;

        resetsystem := true;

    end_if;



    if resetsystem then

        _io_em_do_00 := false;

        _io_em_do_01 := false;

        _io_em_do_02 := false;

    end_if;



end_if;