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本人最近開始做西門子300的項目了，大家誰有300的間接尋址的例子啊   看手冊看得有點迷糊了   望大家指點         本人做過200的間接尋址和for循環(huán)

OPN   DB     1
      L     DBB [MD 0]
      T     MB     4
      A     I      0.0   //字節(jié)指針
      FP    M     10.0
      JNB   a001
      L     MD     0
      L     P#1.0
      +D    
      T     MD     0
a001: NOP   0
===================================================

    OPN   DB     1
      L     DBW [MD 0]
      T     MW     4
      A     I      0.0  //字尋址指針
      FP    M     10.0
      JNB   a001
      L     MD     0

      +     16
      T     MD     0
a001: NOP   0
=======================================
OPN   DB     1
      L     DBB [MD 0]
      T     MB     4
      A     I      0.0                  //字節(jié)指針
      FP    M     10.0
      JNB   a001
      L     MD     0
      L     P#1.0
      +D    
      T     MD     0
a001: NOP   0
      L     MD     6                    //字節(jié)編號
      SLD   3
      T     MD     0
=====================================================================
     OPN   DB     1
      AN    I      0.0
      FP    M     10.0
      JNB   A001
      L     100
NEXT: T     MB    20                    //循環(huán)開始
      L     DBB    0
      +     1
      T     DBB    0
      T     DBB [MD 0]
      L     MD     0
      +     8
      T     MD     0
      L     MB    20                    // 循環(huán)結(jié)束
      LOOP  NEXT
A001: NOP   0

======================================================

   OPN   #iDrive_IntfcDB
      L     DBNO
      T     #tDriveIntfcDBNum
      LAR1  P##tOutputsPointer

      L     B#16#10                     // 10 hex = S7 Data Type
      T     LB [AR1,P#0.0]              // Transfer to Source pointer byte 0

      L     B#16#2                      // 2 hex = byte data type
      T     LB [AR1,P#1.0]              // Transfer to Source pointer byte 1

      L     24                          // How many bytes to move
      T     LW [AR1,P#2.0]              // Transfer to Source pointer bytes 2-3

      L     #tDriveIntfcDBNum           // Load DB Number
      T     LW [AR1,P#4.0]              // Transfer to Source pointer bytes 4-5

      L     172                         // Load start address of data
      SLD   3                           // Shift data in AR1 3 bits to the left    
      T     LD [AR1,P#6.0]              // Trasfer to Source Pointer bytes 6-9

      L     B#16#84                     // 84 hex = DB memory area
      T     LB [AR1,P#6.0]              // Transfer to Source pointer byte 6

//Copy Outputs From Drive Interface DB To Local Copy
      CALL  SFC   20
       SRCBLK :=#tOutputsPointer
       RET_VAL:=#tRetVal
       DSTBLK :=#tDriveIntfc.Output

    TAR2  #tTempAR2

// Create Pointer To HMI Data

      L     P##iHMIData
      AD    DW#16#FFFFFF
      LAR1  


      LAR2  P##tHMIDataPointer

      L     DIB [AR1,P#0.0]             // 10 hex = S7 Data Type
      T     LB [AR2,P#0.0]              // Transfer to Source pointer byte 0

      L     DIB [AR1,P#1.0]             // 2 hex = byte data type
      T     LB [AR2,P#1.0]              // Transfer to Source pointer byte 1

      L     DIW [AR1,P#2.0]             // How many bytes to move
      T     LW [AR2,P#2.0]              // Transfer to Source pointer bytes 2-3

      L     DIW [AR1,P#4.0]             // Load DB Number
      T     LW [AR2,P#4.0]              // Transfer to Source pointer bytes 4-5

      L     DID [AR1,P#6.0]             // Load start address of data
      T     LD [AR2,P#6.0]              // Trasfer to Source Pointer bytes 6-9


      LAR2  #tTempAR2                   // Restore AR2

      L     0
      T     #tPrevOpOffset

//////Get 1st Op Status Byte Number
      L     P##iFirstRFReadOpStatusByte
      AD    DW#16#FFFFFF
      LAR1  

      L     DID [AR1,P#6.0]             // Load start address of data
      AD    DW#16#FFFFFF
      SRD   3
      T     #t1stOpByteNum
      L     #sOMS_OPHeader.OPstatusAddress
      ==I  
      JCN   _200
      S     #qAllPrevOpsOkToBuild
      JU    NoCk

_200: L     #sOMS_OPHeader.OPstatusAddress
      L     #t1stOpByteNum
      -I    
PrOp: T     #tPrevOpLoop

      LAR1  P##tPrevOpStatusPointer

      L     B#16#10                     // 10 hex = S7 Data Type
      T     LB [AR1,P#0.0]              // Transfer to Source pointer byte 0

      L     B#16#2                      // 2 hex = byte data type
      T     LB [AR1,P#1.0]              // Transfer to Source pointer byte 1

      L     2                           // How many bytes to move
      T     LW [AR1,P#2.0]              // Transfer to Source pointer bytes 2-3

      L     #sRFReadDBNum
      T     LW [AR1,P#4.0]

      L     #t1stOpByteNum              // Transfer to Source pointer bytes 4-5
      L     #tPrevOpOffset              // Load start address of data
      +I    
      SLD   3
      T     LD [AR1,P#6.0]              // Shift data in AR1 3 bits to the left    

      L     B#16#84                     // Trasfer to source pointer bytes 6-9
      T     LB [AR1,P#6.0]              // 84 hex = DB memory area

      CALL  SFC   20                    // Transfer to source pointer byte 6
       SRCBLK :=#tPrevOpStatusPointer
       RET_VAL:=#tRetVal
       DSTBLK :=#tCurrPrevOp

      SET  
      O     #tCurrPrevOp.Accept
      O     #tCurrPrevOp.NoOperation
      JCN   PrRj

      L     1
      L     #tPrevOpOffset
      +I    
      T     #tPrevOpOffset

      L     #tPrevOpLoop
      LOOP  PrOp

      S     #qAllPrevOpsOkToBuild
      L     0
      T     #qPrevOperRejRFByte
      T     #sPrevOperRejRFByte


      JU    NoCk

PrRj: S     #qPreviousOperReject

      L     #t1stOpByteNum              // Transfer to Source pointer bytes 4-5
      L     #tPrevOpOffset              // Load start address of data
      +I    
      T     #qPrevOperRejRFByte
      T     #sPrevOperRejRFByte
NoCk: NOP   0

上述程序?qū)懗商菪螆D，看著不是更清楚

學習了 ！