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Hello,
I want to increment or decrement a variable type INT by one,
this instruction works for me in Tia Portal, in TwinCAT how would it be?..
PROGRAM MAIN
VAR
var : INT;
END_VAR
var +=1;
Hi,
To increase by 1:
var := var + 1;
To decrease by 1:
var := var - 1;
I wouldn't recommend using 'var' as your variable name since it's a keyword in TwinCAT 3.
Isn't there a more compact instruction?
Variable Name "var" was an example without taking anything into account...
Thanks.
If you'd like you can create a function to do that as well.
FUNCTION F_IncreaseBy:
FUNCTION F_IncreaseBy : BOOL VAR_INPUT nNumber :REFERENCE TO INT ; nIncreaseBy : INT; END_VAR VAR END_VAR nNumber := nNumber + nIncreaseBy; F_IncreaseBy := TRUE;
MAIN:
PROGRAM MAIN VAR nNumber : INT; END_VAR F_IncreaseBy(nNumber,2); // number, increase amount
I'd love to have a full set of assignment operators in ST, plus pre- and post- increment/decrement. But alas, 'tis not to be. I sometimes find myself typing them in by mistake then gritting my teeth as the compile errors stack up.