SFC51, Error

Hello,

I want to call SFC51 in Function(language SCL) when I compile the block it shows me error DR line

FUNCTION FC2895: VOID

VAR_INPUT
   REQ:BOOL;
    SZL_ID:WORD;
    INDEX:WORD;
    END_VAR
VAR_OUTPUT
      BUSY:BOOL;
      SZL_HEADER:STRUCT
      A:WORD;
      B:WORD;
    END_STRUCT;
    DR:ANY;
   
     Ret_Value : INT ;
           
END_VAR

BEGIN
    RDSYSST(REQ := REQ, // IN: BOOL
            SZL_ID := SZL_ID, // IN: WORD
            INDEX := INDEX, // IN: WORD
            BUSY :=BUSY,  // OUT: BOOL
            SZL_HEADER := SZL_HEADER, // OUT: STRUCT
            DR :=  DR// OUT: ANY
            );
           
        END_FUNCTION
can you please tell me what is the problem

----------------------------------------------------------------------------------------------------
Split from SFC 51 "RDSYSST" for Rack/station status information SZLID 292.

Hello,
When calling an FC/SFC in another , all parameters can not be transferred to outputs of calling FC.For more information check the STEP 7 Online manual.Process them first in temp area and then send to output area in for of elementary data types.

FUNCTION FC2895: VOID

VAR_INPUT
   REQ:BOOL;
    SZL_ID:WORD;
    INDEX:WORD;
    END_VAR
VAR_OUTPUT
      BUSY:BOOL;
      
    DR:ANY;
  
     Ret_Value : INT ;
          
END_VAR
VAR_temp
     // BUSY:BOOL;
     SZL_HEADER:STRUCT
LENTHDR:WORD;
N_DR:WORD;
END_STRUCT;
  //  DR:ANY;
  
    // Ret_Value : INT ;
          
END_VAR

BEGIN
   ret_value:= RDSYSST(REQ := REQ, // IN: BOOL
            SZL_ID := SZL_ID, // IN: WORD
            INDEX := INDEX, // IN: WORD
            BUSY :=BUSY,  // OUT: BOOL
            SZL_HEADER := SZL_HEADER, // OUT: STRUCT
            DR :=  DR// OUT: ANY
            );
          
        END_FUNCTION

I hope this helps,

hdhosseini

Thanks