Siemens Simatic S7 Series System Manual

Program instructions
7.18 Subroutine
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
351
Example: Subroutine call using string parameter
This example copies a different string literal to a unique address depending upon the given
input. The unique address of this string is saved. The string address is then passed to the
subroutine by using an indirect address. The data type of the subroutine input parameter is
string. The subroutine then moves the string to a different location.
A string literal can also be passed to the subroutine. The string reference inside the
subroutine is always the same.
LAD
STL
MAIN
Network 1
LD I0.0
SCPY "string1", VB100
AENO
MOVD &VB100, VD0
MAIN
Network2
LD I0.1
SCPY "string2", VB200
AENO
MOVD &VB200, VD0
MAIN
Network3
LD I0.2
CALL SBR_0, *VD0
MAIN
Network4
LD I0.3
CALL SBR_0, "string3"
SBR0
Network 1
LD SM0.0
SSCPY *LD0, VB300

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.