Siemens Simatic S7 Series System Manual

Programming concepts
5.2 Elements of the user program
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
89
The following example shows a program that includes a subroutine and an interrupt routine.
This sample program uses a timed interrupt for reading the value of an analog input every
100 ms.
Table 5- 1 Sample program with a subroutine and an interrupt routine
Main
Network 1
LD SM0.1
CALL SBR_0
On first scan, call subrou-
tine 0.
SBR 0
Network 1
LD SM0.0
MOVB 100, SMB34
ATCH INT_0, 10
ENI
Set the interval to 100 ms
for the timed interrupt.
Enable interrupt 0.
INT 0
Network 1
LD SM0.0
MOVW AIW4,VW100
Sample the value of analog
input AI4.

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.