String copy in Step7 SCL by SFC20 problems

Coralreef

Member
C
Join Date
May 2006
Location
Dk
Posts
23
Hi

Im trying to use SFC20 BLK Move in a piece of SCL code in Step7.

I need to copy/move one string[16] in a DB to another DB place !

If a block call is inserted with SFC20 in my SCL code it looks like this :

BLKMOV(SRCBLK := // IN: ANY
,DSTBLK := // OUT: ANY
); // INT

At SRCBLK i would write P#db2000.dbx220.0 BYTE 18 and at DSTBLK i would write P#db2000.dbx20.0 BYTE 18

But this dosnt work ?

I have also tryed doing the call like this :

BLK_Move_Dummy := BLKMOV(SRCBLK := P#db2000.dbx220.0 BYTE 18, DSTBLK := P#db2000.dbx20.0 BYTE 18);

Where BLK_Move_Dummy is defined as an INT for the RET_VAL !

If i do a blk mov with just INT values its all good but as soon as p# pointer for string values are added it all goes wrong. I can do the same pointer in ladder and it works
 
Here's an example copy using SFC20:

Code: 
FUNCTION FC111: void
VAR_TEMP
Source,Dest:ANY;
S AT Source:STRUCT
	ID:BYTE;
	TYP:BYTE;
	NUM:INT;
	DBN:INT;
	PTR:DWORD;
	END_STRUCT;
D AT Dest:STRUCT
	ID:BYTE;
	TYP:BYTE;
	NUM:INT;
	DBN:INT;
	PTR:DWORD;
	END_STRUCT;
  iSFC20Return:INT;
END_VAR
S.ID:=16#10;
S.TYP:=16#02;
S.NUM:=18;
S.DBN:=2000;
S.PTR:=16#840006e0; //DBX220.0
D.ID:=16#10;
D.TYP:=16#02;
D.NUM:=18;
D.DBN:=2000;
D.PTR:=16#840000A0; //DBX20.0
iSFC20Return:=sfc20(srcblk:= source, dstblk:= dest);
END_FUNCTION
 
quick and dirty - take the byte address and multiply by 8 and enter the value in hex. The 84 means DBX
 
Edit - embarrassed mode on

I truely am sleeping this morning.....

Thanks for the basics !

Edit - embarrassed mode off :D
 
Guys guys ...
Strings and SCL are like fish and water.
No need to program BLKMOV (if BLKMOV is needed, the SCL compiler automatically inserts it in the generated STL code).

Code: 
DATA_BLOCK Strings
    STRUCT
        line1 : STRING[20] ;
        line2 : STRING[20] ;
        manylines1 : ARRAY[1..10] OF STRING[20] ;
        manylines2 : ARRAY[1..10] OF STRING[20] ;
    END_STRUCT
BEGIN
    line1:='hello' ;
    line2:='goodbye' ;
    manylines1[1]:='1' ;
    manylines1[2]:='2' ;
    manylines1[3]:='3' ;
    manylines1[4]:='4' ;
    manylines1[5]:='5' ;
    manylines1[6]:='6' ;
    manylines1[7]:='7' ;
    manylines2[2]:='20' ;
END_DATA_BLOCK
 
FUNCTION String_manipluate : VOID
    "Strings".manylines1[2] := "Strings".line1 ;
    "Strings".line2 := "Strings".line1 ;
    "Strings".Manylines2 := "Strings".Manylines1 ;
END_FUNCTION
 

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