Siemens Simatic S7 Series System Manual

Technical specifications
A.2 S7-200 SMART CPUs
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
571
Technical data
Description
CPU ST20 DC/DC/DC, CPU SR20 AC/DC/Relay
Cyclic interrupts
2 at 1 ms resolution
Edge interrupts
4 rising and 4 falling (6 and 6 with optional signal board)
Memory card microSDHC Card (optional)
Real time clock accuracy
+/- 120 seconds/month
Real time clock retention time
7 days typ./6 days min. at 25°C (maintenance-free Super Capacitor)
1
You can configure areas of V memory, M memory, C memory (current values), and portions of T memory (current val-
ues on retentive times) to be retentive, up to the specified maximum amount.
2
The specified maximum pulse frequency is possible only for CPU models with transistor outputs. Pulse output operation
is not recommended for CPU models with relay outputs.
Table A- 10 Performance
Type of instruction
Execution speed
Boolean
150 ns instruction
Move Word
1.2 μs/instruction
Real math
3.6 μs/instruction
Table A- 11 User program elements supported
Element
Description
POUs Type/ quan-
tity
Main program: 1
Subroutines: 128 (0 to 127)
Interrupt routines: 128 (0 to 127)
Nesting
depth
From main program: 8 subroutine levels
From interrupt routine: 4 subroutine levels
Accumulators
Quantity
4
Timers Type/ quan-
tity
Non-retentive (TON, TOF): 192
Retentive (TONR): 64
Counters
Quantity
256

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.