Siemens SIMATIC S7 System Manual page 691

Technical data
Inductive clamp voltage
Switching delay (Qa.0 to
Qa.3)
Switching delay (Qa.4 to
Qa.7)
Lifetime mechanical (no
load)
Lifetime contacts at rated
load
Output state in STOP
mode
Number of outputs on
simultaneously
Cable length (max.),
in meters
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
CPU ST20 DC/DC/DC
L+ minus 48 V DC,
1 W dissipation
1.0 μs max., off to on
3.0 μs max., on to off
50 μs max., off to on
200 μs max., on to off
--
--
Last value or substitute value
(default value 0)
8
Shielded: 500 m
Unshielded: 300 m
CPU SR20 AC/DC/Relay
Not recommended
10 ms max.
10 ms max.
10,000,000 open/close cycles 10,000,000 open/close cycles
100,000 open/close cycles
Last value or substitute value
(default value 0)
8
Shielded: 500 m
Unshielded: 300 m
Technical specifications
A.2 S7-200 SMART CPUs
CPU CR20s AC/DC/Relay
Not recommended
10 ms max.
10 ms max.
100,000 open/close cycles
Last value or substitute value
(default value 0)
8
Shielded: 500 m
Unshielded: 300 m
691