Siemens SIMATIC S7 System Manual page 20

Product overview
1.1 S7-200 SMART CPU
Table 1- 3 Standard expandable CPUs
Features
Dimensions: W x H x D (mm)
User memory Program
User data
Retentive
On-board digital
Inputs
•
I/O
Outputs
•
Expansion modules
Signal board
High-speed Single phase
counters (6
total)
A/B phase
Pulse outputs
2
PID loops
Real-time clock with 7-day back-up
You can configure areas of V memory, M memory, C memory (current values), and portions of T memory (current val-
1
ues on retentive timers) to be retentive, up to the specified maximum amount.
The specified maximum pulse frequency is possible only for CPU models with transistor outputs. Pulse output operation
2
is not recommended for CPU models with relay outputs.
Refer to the technical specifications (Page 679) for the power requirements of the CPU and
the expansion modules. Use the worksheets in Appendix B, Calculating a power budget
(Page 790) to calculate your power budget.
20
CPU SR20, CPU SR30,
CPU ST20 CPU ST30
90 x 100 x 81 110 x 100 x 81
12 Kbytes 18 Kbytes
8 Kbytes 12 Kbytes
10 Kbytes max. 10 Kbytes max.
1
12 DI 18 DI
• •
8 DQ 12 DQ
• •
6 max. 6 max.
1 1
4 at 200 kHz 5 at 200 kHz
2 at 30 kHz 1 at 30 kHz
2 at 100 kHz 3 at 100 kHz
2 at 20 kHz 1 at 20 kHz
2 at 100 kHz 3 at 100 kHz
8 8
Yes Yes
CPU SR40,
CPU ST40
125 x 100 x 81
24 Kbytes
16 Kbytes
10 Kbytes max.
1 1
24 DI
•
16 DQ
•
6 max.
1
4 at 200 kHz
2 at 30 kHz
2 at 100 kHz
2 at 20 kHz
3 at 100 kHz
8
Yes
System Manual, V2.3, 07/2017, A5E03822230-AF
CPU SR60,
CPU ST60
175 x 100 x 81
30 Kbytes
20 Kbytes
10 Kbytes max.
1
36 DI
•
24 DQ
•
6 max.
1
4 at 200 kHz
2 at 30 kHz
2 at 100 kHz
2 at 20 kHz
3 at 100 kHz
8
Yes
S7-200 SMART