s7 scl adding 2 butes

[ssantiago]

Hi, can anyone explain me why s7 scl compiler doesn't allows me to add two bytes. I wrote this simple code and got error "E: L 00028 C 00024: Invalid types of addresses" in each row with adding bytes:

VAR_TEMP
    b1:BYTE;
    b2:BYTE;
    b3:BYTE;
    b4:BYTE;
END_VAR
    b1:=b#16#0 + b#16#1;
    b2:=b1 + b#16#1;
    b3:=b1 + b2;
    b4:=b1 + 1;

 

[L D[AR2P#0.0]]

Addition can only be performed on integeres, double integers and reals. You have to convert the bytes to ints to perform addition.

 

[ssantiago]

Thanks for quick reply. How can I perform conversion from INT to BYTE after addition?

 

[bara_hence]

byYourResult := INT_TO_BYTE(iYourResult);

Should work..

 

[ssantiago]

Yes... I should try before posting such questions. Thanks for help.