Siemens SIMATIC S7 Functional Safety Manual page 154

Technical specifications
A.2 Fail-Safe CPU technical specifications
Technical data
Isolation groups
Isolation (group-to-group)
Inductive clamp voltage
Switching delay (Qa.0 to Qa.3)
Switching delay (Qa.4 to Qb.1)
Maximum relay switching frequency
Pulse Train Output rate
Lifetime mechanical (no load)
Lifetime contacts at rated load
Behavior on RUN to STOP
Number of outputs on simultaneously
Cable length (meters)
Relay group-to-group isolation separates line voltage from SELV/PELV and separates different phases up to 250 VAC
1
line to ground.
For CPU models with relay outputs, you must install a digital signal board (SB) to use the pulse outputs.
2
Depending on your pulse receiver and cable, an additional load resistor (at least 10% of rated current) may improve
3
pulse signal quality and noise immunity.
External overload protection is to limit fire hazard. Overload can damage relay or transistor output.
4
154
CPU 1214FC
DC/DC/Relay
2
1500 VAC
1
--
10 ms max.
10 ms max.
1 Hz
Not recommended
2
10,000,000 open/close cycles
100,000 open/close cycles
Last value or substitute value (default value 0)
10 outputs at 55 °C horizontal or 45 °C vertical
500 m shielded, 150 m unshielded
CPU 1214FC
DC/DC/DC
1
--
L+ minus 48 VDC,
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
--
100 kHz (Qa.0 to Qa.3) , 2 Hz min.
3
20 kHz (Qa.4 to Qb.1)
3
--
--
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA