Siemens Simatic S7 Series

Program instructions
7.15 String
S7-200 SMART
322 System Manual, 09/2015, A5E03822230-AC
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