Siemens Simatic S7 Series

Technical specifications
A.2 S7-200 SMART CPUs
S7-200 SMART
574 System Manual, 09/2015, A5E03822230-AC
Table A- 16 Digital outputs
Technical data
CPU ST20 DC/DC/DC
CPU SR20 AC/DC/Relay
Number of outputs
8
8
Type Solid state - MOSFET (sourcing) Relay, dry contact
Voltage range
20.4 to 28.8 V DC
5 to 30 V DC or 5 to 250 V AC
Logic 1 signal at max. current
20 V DC min.
--
Logic 0 signal with 10 KΩ load
0.1 V DC max.
--
Rated current per point (max.)
0.5 A
2.0 A
Rated current per common
(max.)
6 A 10.0 A
Lamp load
5 W
30 W DC/200 W AC
ON state resistance
0.6 Ω max.
0.2 Ω max. when new
Leakage current per point
10 μA max.
--
Surge current
8 A for 100 ms max.
7 A with contacts closed
Overload protection
No
No
Isolation (field side to logic) 500 V AC for 1 minute 1500 V AC for 1 minute (coil to contact)
None (coil to logic)
Isolation resistance
--
100 M Ω min. when new
Isolation between open contacts
--
750 V AC for 1 minute
Isolation groups
2
1
Inductive clamp voltage
L+ minus 48 V DC, 1 W dissipation
Not recommended
Switching delay (Qa.0 to Qa.3) 1.0 μs max., off to on
3.0 μs max., on to off
10 ms max.
Switching delay (Qa.4 to Qa.7) 50 μs max., off to on
200 μs max., on to off
10 ms max.
Lifetime mechanical (no load)
--
10,000,000 open/close cycles
Lifetime contacts at rated load -- 100,000 open/close cycles
Output state in STOP mode Last value or substitute value (default
value 0)
Last value or substitute value (default value
0)
Number of outputs on simulta-
neously
8 8
Cable length (max.), in meters Shielded: 500 m
Unshielded: 300 m
Shielded: 500 m
Unshielded: 300 m