Siemens SIMATIC S7-200, Системное руководство

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Program instructions
7.15 String
S7-200 SMART
364
System Manual, V2.3, 07/2017, A5E03822230-AF
7.15.2 Copy substring from string
LAD / FBD STL Description
SSCPY IN,
INDX, N, OUT
The copy substring from string instruction copies the assigned number of charac-
ters N from the string specified by IN, starting at the index INDX, to a new
string assigned by OUT.
Note: The SSTR_CPY instruction operates on bytes and not characters. Because
Chinese characters are not represented by a single byte, unexpected results can
occur with the SSTR_CPY instruction with strings containing Chinese characters.
If you know the number of bytes that a character string occupies, you can use the
SSTR_CPY instruction with the correct number of bytes.
Non-fatal errors with ENO=0 SM bits affected
• 0006H Indirect address
•
0091H Operand out of range
• 009BH Index = 0
None
Input / output Data type Operand
IN STRING VB, LB, *VD, *LD, *AC, Constant string
OUT STRING VB, LB, *VD, *LD, *AC
INDX, N BYTE IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant
Example: Copy substring instruction
AD STL
Starting at the seventh byte after the
byte count in the string at VB0, copy 5
bytes to a new string at VB20.
Network 1
LD I0.0
SSCPY VB0, 7, 5, VB20