Simatic S7 SFC20(BLKMOV) Question

[arocon]

In one network SFC20(BLkMOV) is used to transfer 8 byte data from P#DB500.DBX8.0(SRC BLK) to P#DB20.DBX4.0(DST BLK).

I would like to change P#DB500.DBX8.0 to P#DB1000.DBX8.0. But it does not accept. Though both are same data type.

Could anyone please as soon as possible tell me what is the problem ?

Thank you

 

[PeterMalt]

There are 2 methodes

1 Use any parameters

      CALL  "BLKMOV"
       SRCBLK :=P#DB500.DBX8.0 BYTE 8
       RET_VAL:=MW20
       DSTBLK :=P#DB1000.DBX8.0 BYTE 8

2 use symbolik adressing and siemens knows the any parameter
the byte's to move must be in a structure

    CALL  "BLKMOV"
       SRCBLK :="datablock500".ByteStruct
       RET_VAL:=MW20
       DSTBLK :="datablock1000".ByteStruct

 

[Manglemender]

You don't say what CPU you are using. DB1000 may be outside the addressable range of the CPU but probably not as you are already using DB500. The other thing to check is that DB1000 is at least 16 bytes long or there will not be room for the data.

Nick