Siemens Simatic S7 Series

Technical specifications
A.2 S7-200 SMART CPUs
S7-200 SMART
578 System Manual, 09/2015, A5E03822230-AC
Technical data
Description
CPU ST30 DC/DC/DC
CPU SR30 AC/DC/Relay
Edge interrupts 4 rising and 4 falling (6 and 6 with op-
tional signal board)
4 rising and 4 falling (6 and 6 with optional
signal board)
Memory card
microSDHC Card (optional)
microSDHC Card (optional)
Real time clock accuracy
+/- 120 seconds/month
+/- 120 seconds/month
Real time clock retention time 7 days typ./6 days min. at 25°C (mainte-
nance-free Super Capacitor)
7 days typ./6 days min. at 25°C (mainte-
nance-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- 23 Performance
Type of instruction
Execution speed
Boolean
150 ns instruction
Move Word
1.2 μs/instruction
Real math
3.6 μs/instruction
Table A- 24 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