Twincat 3 error then use string as variable name

[r142dm]

Hi!


i try to use string as variable name in a forloop my problem is tahat my if insturktion not allow strings as variable name.


my declaration is


var



aForSend : ARRAY [1..3,1..6] OF STRING;

bSmsNr1InUse : BOOL;
bSmsNr2InUse : BOOL;
bSmsNr3InUse : BOOL;
bSmsNr4InUse : BOOL;
bSmsNr5InUse : BOOL;
bSmsNr6InUse : BOOL;


k: INT;


end_var


program



FOR k:=1 TO 6 BY 1 DO

IF (concat('bSmsNr',concat(INT_TO_STRING(k),'InUse'))) THEN
aForSend[3,k]:='1';
ELSE
aForSend[3,k]:='0';
END_IF
END_FOR



i get error cannot convert type string (255) to type bool


//Dennis

 

[BachPhi]

try IF ('bSmsNr'+INT_TO_STRING(k)+'InUse') THEN

or add ; for END_IF and END_FOR

 

[L D[AR2P#0.0]]

Maybe the op could describe in words exactly he is trying do...

 

[BachPhi]

Maybe the op could describe in words exactly he is trying do...

The error is in the IF statement I believe, for one thing the IF and FOR loop both missing ';' , so I'd I'd try that first.

 

[Jkoso]

You cannot use concat in IF statement condition. It has to be boolean result. Thats why you got that build error.
Do the concat before IF statement and use comparison in the condition.
And in twincat you don't have to use ; in the end of statements.

 

[r142dm]

Hi Jkoso!


can you give me example i don't no whate you mean

 

[Jkoso]

What i mean IF (concat('bSmsNr',concat(INT_TO_STRING(k),'InUse')) ) THEN the result is STRING, it should be something like this IF (concat('bSmsNr',concat(INT_TO_STRING(k),'InUse')) ) = STRING_VARIABLE THEN then the result is boolean.

If you are trying to check if some of bSmsNr variables are true and then write it to string table as true, its way easier to declare bSmsNrInUse as an boolean array.

VAR
     aForSend : ARRAY [1..3,1..6] OF STRING;
     aSmsNrInUse : ARRAY [1..6] OF BOOL;
     k : INT;
END_VAR

FOR k:=1 TO 6 BY 1 DO

IF aSmsNrInUse[k] THEN
    aForSend[3,k]:='1';
ELSE
    aForSend[3,k]:='0';
END_IF
END_FOR

 

[L D[AR2P#0.0]]

..uncanny similarity to my thoughts....