Using sfc83,84 in an s7 FB

I am trying to make a block that controls sfc83 and sfc84 for reading and writing to an unlinked db.

just for making everyting easier but i cant get it to work. i think it is the ret_val of the sfc's that is making problems.

The code looks like this today. i dont know how the code the "Int" in the
sfccalls, gets errors all the time.

can anyone tell me how to do it or tell me if it is possible.


FUNCTION_BLOCK RWUNLINKED

VAR_TEMP

ReadDone : BOOL;
WriteDone : BOOL;
RETVAL1 : INT;
retval2 : INT;

END_VAR

VAR_INPUT

ReadToDB : BOOL ;
WriteToDB : BOOL ;
END_VAR


VAR_IN_OUT

SourceDB : ANY ;
DestDB : ANY ;

END_VAR

VAR_OUTPUT
Busywrite : BOOL;
busyRead : BOOL;

statusread : INT ;
Statuswrite : INT ;
END_VAR

VAR
// Static Variables

END_VAR


READ_DBL(REQ := readtodb
,SRCBLK := sourcedb
,BUSY := busyread
,DSTBLK := destdb
); // INT
;

WRIT_DBL(REQ := Writetodb
,SRCBLK := sourcedb
,BUSY := busywrite
,DSTBLK := destdb
); // INT





// Statement Section
;
END_FUNCTION_BLOCK

Problem solved.

retval := write_dbl and then the right source and destination db's on the right place.
many hours for a simple problem.