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Here are the functions i´ve made for outputs and inputs in a plc.
These functions are made for Siemens Step7^® plc's. But a translation to another plc is easy. The easiest way to write a time value is the IEC value T#, a Dword value in mSec.
So i´ve made tree versions of each function. One with the value´s in the old S5Time and two in the IEC Time. The first one uses a internal Timer(S5T), the other uses the timer discribed on the page using SFC64

What are the functions would you say. Well i´ve made one for an output with feedback and runtime function. The other function is for reading an input. This function is very easy, its an independent ON and OFF delay. It uses only one timer.

download awl source (incl. functions.)

Symbol table:

example IO program	FB 2	FB 2	Example of IO program functions
Output (S5T) T#	FC 2001	FC 2001	Output function using IEC T#
Input (S5T) T#	FC 2002	FC 2002	Input delay ON and OFF using IEC T#
Output (S5T#)	FC 2005	FC 2005	Output function using S5T#
Input (S5T#)	FC 2006	FC 2006	Input delay ON and OFF using S5T#

The function using S5T time function with IEC T# input:

The function using S5T time function with S5T# input:

Output: FC 2001/2005: Output function.

Input:	F_in	Funtion in. Marker that can be set or reset in a program. (See Step functions) This indicates that the actuator should perform the function in. (Can be on a cylinder: in, can be a motor: left turn, can be a spindle: backwards, can be single actuator: on, etc)
	F_out	Function out. The opposite of F_in. If you don´t have one you can use the inverted signal of F_in. F_in and F_out may not be high together! Both low is no problem.
	D_in	End sensor of the function in.
	D_out	End sensor of the function out. If you don´t have one you can use the inverted signal of F_in. D_in and D_out may not be high together! Both low is no problem.
	T_in	The time that the input has to be high before D_input becomes high.
	T_out	The time that the input has to be low before D_input becomes low.
	FreeTimer	A internal timer of the plc. This timer may be used only once!
Output:	Y_in	Output for the function in.
	Y_out	Output for the function out.
	Runtime_in	Becomes high if the end sensor of the in function does not comes high before T_in elapsed. The action has then taken to long. The output Y_in becomes low.
	Runtime_out	Output for the function out.
	ENO	Always high.

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Input: FC 2002/2006: Input delay ON and OFF.

Input:	Input	The input bit that has to be read.
	Time_on	The time that the input has to be high before D_input becomes high.
	Time_off	The time that the input has to be low before D_input becomes low.
	FreeTimer	A internal timer of the plc. This timer may be used only once!
In-/Output:	D_input	Delay_input. The marker that can be used in the program as delayed input as described above.
Output:	ENO	Same value as D_input.

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