Proposal for new function under engineering/conversion

oscat.lib fuer TwinCAT/CoDeSys
1

Hi!

I have using this funcion in Arduinos software:
http://arduino.cc/en/Reference/map

I believe this would be valuable function in Oscat basic library under engineering/conversion category. :slight_smile:

Regards !

Mladen Bruck

2

Hi,

as they do give the mathematics, it isn`t too hard to do the coding. I attached the function for CoDeSys2.

you have to call the function like this:

millivolts := map(milliamps,4,20,0,10000); (* Converts 4..20mA into 0..10 Volt *)

Regards
Alex

[gelöscht durch Administrator]

3

nachteil von alex ist integer, ich wurde vorschlagen um es in real zu tun. dan gibts auch kein probleme mit negativ werte.

4

Hi Alex !

Thank you for code…

I meant it vould be valuable for including to library. However, I noticed code later, and I have writen function block since I don’t know how to use function in ladder yet. :frowning:

But, I declared all variables as REAL like so:


FUNCTION_BLOCK MAP
VAR_INPUT
	Start:BOOL;
	In:REAL;
	fromLow:REAL;
	fromHigh:REAL;
	toLow:REAL;
	toHigh:REAL;
END_VAR
VAR_OUTPUT
	End:BOOL;
	Out:REAL;
END_VAR
VAR
END_VAR

Funcion body>
	 Out := (In-fromLow) * (toHigh - toLow) / ((fromHigh - fromLow) + toLow) ;

Is this would be problem ?