Siemens Simatic S7 Series

Technical specifications
A.2 S7-200 SMART CPUs
S7-200 SMART
570 System Manual, 09/2015, A5E03822230-AC
A.2
S7-200 SMART CPUs
A.2.1
CPU ST20 and CPU SR20
A.2.1.1
General specifications and features
General specifications and features of the CPU ST20 and CPU SR20
Table A- 8 General specifications
Technical data
CPU ST20 DC/DC/DC
CPU SR20 AC/DC/Relay
Article number
6ES7 288-1ST20-0AA0
6ES7 288-1SR20-0AA0
Dimensions W x H x D (mm) 90 x 100 x 81 90 x 100 x 81
Weight
320 grams
367.3 grams
Power dissipation
20 W
14 W
Current available (EM bus)
1400 mA max. (5 V DC)
1400 mA max. (5 V DC)
Current available (24 V DC)
300 mA max. (sensor power)
300 mA max. (sensor power)
Digital input current consumption
(24 V DC)
4 mA/input used 4 mA/input used
Table A- 9 CPU features
Technical data
Description
CPU ST20 DC/DC/DC, CPU SR20 AC/DC/Relay
User memory
1
Program
12 Kbytes
User data (V)
8 Kbytes
Retentive
10 Kbytes max.
1
On-board digital I/O
12 inputs/8 outputs
Process image
256 bits of inputs (I) / 256 bits of outputs (Q)
Analog image
56 words of inputs (AI) / 56 words of outputs (AQ)
Bit memory (M)
256 bits
Temporary (local) memory (L)
64 bytes in the main program and 64 bytes in each subroutine and interrupt routine
Sequential control relays (S)
256 bits
Expansion modules expansion
6
Signal board expansion
1 max.
High-speed counters 4 total
• 4 at 200 K Hz for single phase
• 2 at 100 K Hz for A/B phase
Pulse outputs
2
2 at 100 KHz
2
Pulse catch inputs
12