S7 300/400 的一些功能和技巧1
数据块拷贝
FUNCTION FC 100 : VOID
TITLE =
//DB BLOCK COPY
AUTHOR : AXG
NAME : DBBTODBB
VERSION : 0.1


VAR_INPUT
  SOU_DB : INT ; //SOURCE DB NUMBER
  LENG : INT ; //HOW MANY TO COPY
  DES_DB : INT ; //DESTINATION DB NUMBER
END_VAR
VAR_TEMP
  SOURCE : ANY ; 
  DEST : ANY ; 
END_VAR
BEGIN
NETWORK
TITLE =

      LAR1  P##SOURCE; // Load the start address of the ANY pointers in AR1.
      L     B#16#10; // Load the syntax ID and
      T     LB [AR1,P#0.0]; // transfer it to the ANY pointer. 
      L     B#16#4; // Load data type WORD and
      T     LB [AR1,P#1.0]; // transfer it to the ANY pointer.
      L     #LENG; // Load HOW MANY WORDS and
      T     LW [AR1,P#2.0]; // transfer them to the ANY pointer
      L     #SOU_DB; // Source is DB[?], DBB0.0
      T     LW [AR1,P#4.0]; // 
      L     P#DBX 0.0; // 
      T     LD [AR1,P#6.0]; // 
      LAR1  P##DEST; //Load the DESTINATION address of the ANY pointer in AR1. 
      L     B#16#10; //Load the syntax ID and 
      T     LB [AR1,P#0.0]; //transfer it to the ANY pointer. 
      L     B#16#4; //Load data type WORD and 
      T     LB [AR1,P#1.0]; //transfer it to the ANY pointer. 
      L     #LENG; //Load HOW MANY WORDS and 
      T     LW [AR1,P#2.0]; //transfer them to the ANY pointer.
L     #DES_DB; //Destination is DB{?}, DBB0.0 
      T     LW [AR1,P#4.0]; 
      L     P#DBX 0.0; // 
      T     LD [AR1,P#6.0]; // 
      CALL "BLKMOV" (//Call the block move system function 
           SRCBLK                   := #SOURCE,// 
           RET_VAL                  := MW   210,//Evaluate the BR bit and MW 210
           DSTBLK                   := #DEST);// 


END_FUNCTION


使用说明：可直接调用，#SOURCE---源数据块号
                      #DEST------目标数据块号
                       #LENG----要拷贝数据的长度