Indirect addressing problem

so, where is the problem?

If I don't remember bad, you should declare x, y and z as word instead of Integer. It seams the same but siemens have this type of things...

It will result like:

DB[variableX].DBX[variableY].[variableZ]

Guimmie said:

so, where is the problem?

If I don't remember bad, you should declare x, y and z as word instead of Integer. It seams the same but siemens have this type of things...

It will result like:

DB[variableX].DBX[variableY].[variableZ]

Click to expand...

Don't believe that would work.

Maybe something like

I would do limit checking on all data too, like variableZ must be within the range of 0 to 7.

Source code for a function as follows:

Indirect adressing

Please find here a tested function that fulfill your requirements :

FUNCTION FC 1 : VOID
TITLE =
VERSION : 0.1


VAR_INPUT
DB_Nr : INT ;
Bit_Posit : INT ;
Word_Posit : INT ;
END_VAR
VAR_TEMP
TMP_DATA_PNT : DWORD ; //Circular Buffer Data Pointer (PTR format)
TMP_DB_Nr : INT ;
END_VAR
BEGIN
NETWORK
TITLE =

L #DB_Nr;
T #TMP_DB_Nr;
OPN DB [#TMP_DB_Nr];
L #Word_Posit;
SLD 3;
T #TMP_DATA_PNT;
L #Bit_Posit;
OD ;
T #TMP_DATA_PNT;
OPN DB [#TMP_DB_Nr];
SET ;
S DBX [#TMP_DATA_PNT];




END_FUNCTION