Siemens Simatic S7 Series System Manual

Program instructions
7.15 String
S7-200 SMART
320 System Manual, 09/2015, A5E03822230-AC
7.15
String
7.15.1
String (Get length, copy, and concatenate)
SLEN (String length)
LAD / FBD
STL
Description
SLEN IN, OUT
The string length instruction returns the length in bytes of the string specified by
IN.
Note: Because Chinese characters are not represented by a single byte, the
STR_LEN function does not return the number of characters in a string contain-
ing Chinese characters.
Error conditions with ENO = 0
SM bits affected
• 0006H Indirect address
• 0091H Operand out of range
None
Input / output
Data type
Operand
IN
STRING
VB, LB, *VD, *LD, *AC, Constant string
OUT
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC
SCPY and SCAT (String copy and string concatenate)
LAD / FBD
STL
Description
SCPY IN, OUT
The copy string instruction copies the string assigned by IN to the string as-
signed by OUT.
SCAT IN, OUT
The concatenate string instruction appends the string assigned by IN to the
end of the string assigned by OUT.
Note: The STR_CPY and STR_CAT instructions operate on bytes and not characters. Because Chinese characters are not
represented by a single byte, unexpected results can occur with the STR_CPY and STR_CAT instructions with strings
containing Chinese characters. If you know the number of bytes that a character string occupies, you can use the
STR_CPY and STR_CAT instructions with the correct number of bytes.

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.