Siemens Simatic S7 Series System Manual

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).
LAD
STL
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).
Network 1
LD I0.0
MOVB 1, AC0
SFND VB0, VB20, AC0

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.