Siemens SIMATIC S7 - Page 691

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