Old classic If-Then...

[Ioannis]

I got a little confussed on this nested If-Then:

if level<=high_level then
	if thermiko1=0 then
		if thermistor1=0 then
			if auto1=0 then
				if onboard_an2<=pres_limit then
					if pump=0 then
						module_rel_out=1
					else
						module_rel_out=0
					endif
				endif
			endif
		endif
	endif
endif

does make module_rel_out=1 but does not makes it 0 if the conditions (one or more) are not met.

I am missing something but cannot figure what...

Any help appreciated.
Ioannis

[Tobias]

You need to insert the ELSE statement for each IF. For example, if the first IF is not true, the code never gets to the ELSE ...=0

[mister_e]

to execute this part...

if pump=0 then
						module_rel_out=1
					else
						module_rel_out=0
					endif

ALL previous conditions have to be met.

[Melanie]

Simply pre-load the ELSE condition into the variable before entering the IF loop...

module_rel_out=0
if level<=high_level then
	if thermiko1=0 then
		if thermistor1=0 then
			if auto1=0 then
				if onboard_an2<=pres_limit then
					if pump=0 then module_rel_out=1
					endif
				endif
			endif
		endif
	endif

[Acetronics2]

Hi, Ioannis

Why not use an AND combination of your conditions.

Karnaugh would LOVE your example.

Try this little soft ... and ENJOY.

Karnaugh Minimizer 2.0
Copyright (c) 2002-2007 ShurikSoft.
http://www.shuriksoft.com

Alain

[Ioannis]

Hi all and thanks for the replies.

Alain: I tried with AND but got an error of too many variables. Indeed was long line!

Melanie: That was what I did just before reading your post. Yes this works but was not appealing to me as an elegant solution.

Steve & Tobias: Yes,I see now, after the morning cup of coffee that it never reached the ELSE statement.

Thanks again to all.

Ioannis