Program instructions
7.15 String
S7-200 SMART
324 System Manual, 09/2015, A5E03822230-AC
Example: Find string within string instruction
A string stored at VB0 is used as a command for turning a pump on or off. A string "On" is
stored at VB20 and a string "Off" is stored at VB30. The result of the find string within string
instruction is stored in AC0 (the OUT parameter). If the result is not 0, then the string 'On'
was found in the command string (VB12).
1. Set AC0 to 1. (AC0 is used as the
OUT parameter.)
2. Search the string at VB0 for the
string at VB20 ('On'), starting at
the first position (AC0=1).
LD I0.0
MOVB 1, AC0
SFND VB0, VB20, AC0
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