S7-300 link variables......

baselch0 · May 7, 2011

Hi all,

I'd like to kmow if in step7 there is an istruction or a function to give the possibility to link (not add) two variables? I no idea how to realize the code

Example:

Two variables MW100=12(INT FORMAT) and MW102=678(INT FORMAT) so I need to get in the new varaibles the follow result MW104=12678.

Pratically the "union" of the data 12 and 678

Thankd in advance

L D[AR2P#0.0] · May 7, 2011

You have shown MW104 = (MW100*1000) + MW102

Is this what you want to implement ?

baselch0 · May 7, 2011

Thanks, correct LD, but I need realize an additional control, because in my example the data are 12 and 678 , but in other case the data could be 12 and 23 etc etc

L D[AR2P#0.0] · May 7, 2011

So what would the result of your "union" of 12 and 23 be, 1223 ?

baselch0 · May 7, 2011

L D[AR2 said:
So what would the result of your "union" of 12 and 23 be, 1223 ?

correct 1223

345 and 6789 = 3456789

4523 and 1 = 45231

L D[AR2P#0.0] · May 7, 2011

Hang on, your first post suggested the result would be stored as an integer in MW104, do you want the result to be a double integer ?

What about 4523 and 0 ?

baselch0 · May 7, 2011

L D[AR2 said:
Hang on, your first post suggested the result would be stored as an integer in MW104, do you want the result to be a double integer ?

What about 4523 and 0 ?

4523 and 0 = 4523.

yeah... I consider to use the data format DINT type
to avoid overflow

Other things I forget to write in the post:
the data will be always positive (never negative eg -345)

L D[AR2P#0.0] · May 7, 2011

Result of simulation:

L D[AR2P#0.0] · May 7, 2011

Code:

FUNCTION FC 1 : DINT
TITLE =
VERSION : 0.1


VAR_INPUT
  iLowDigits : INT ;    
  iHighDigits : INT ;    
END_VAR
BEGIN
NETWORK
TITLE =

      L     #iLowDigits; 
      L     0; 
      ==I   ; 
      JC    d0; 
      TAK   ; 
      L     9; 
      <=D   ; 
      JC    d1; 
      TAK   ; 
      L     99; 
      <=D   ; 
      JC    d2; 
      TAK   ; 
      L     999; 
      <=D   ; 
      JC    d3; 
      TAK   ; 
      L     9999; 
      <=D   ; 
      JC    d4; 
      TAK   ; 
      L     L#99999; 
      <=D   ; 
      JC    d5; 
      JU    err; 

d0:   L     #iHighDigits; 
      JU    add; 
d1:   L     10; 
      L     #iHighDigits; 
      *D    ; 
      JU    add; 
d2:   L     100; 
      L     #iHighDigits; 
      *D    ; 
      JU    add; 
d3:   L     #iHighDigits; 
      L     1000; 
      *D    ; 
      JU    add; 
d4:   L     #iHighDigits; 
      L     10000; 
      *D    ; 
      JU    add; 
d5:   L     #iHighDigits; 
      L     10000; 
      *D    ; 
      JU    add; 

add:  L     #iLowDigits; 
      +D    ; 
      T     #RET_VAL; 
      SET   ; 
      SAVE  ; 
      BEU   ; 



err:  L     0; 
      T     #RET_VAL; 
      CLR   ; 
      SAVE  ; 
      BEU   ; 


END_FUNCTION

baselch0 · May 7, 2011

Thanks a lot.....great LD

S7-300 link variables......

baselch0

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L D[AR2P#0.0]

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baselch0

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L D[AR2P#0.0]

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L D[AR2P#0.0]

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L D[AR2P#0.0]

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L D[AR2P#0.0]

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baselch0

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