Siemens SIMATIC S7 - Page 154

Technical specifications
A.2 Fail-Safe CPU technical specifications
S7-1200 Functional Safety Manual
154 Manual, 02/2015, A5E03470344-AA
Technical data
CPU 1214FC
DC/DC/Relay
CPU 1214FC
DC/DC/DC
Isolation groups
2
1
Isolation (group-to-group) 1500 VAC
1
--
Inductive clamp voltage -- L+ minus 48 VDC,
1 W dissipation
Switching delay (Qa.0 to Qa.3) 10 ms max. 1.0 μs max., off to on
3.0 μs max., on to off
Switching delay (Qa.4 to Qb.1) 10 ms max. 50 μs max., off to on
200 μs max., on to off
Maximum relay switching frequency
1 Hz
--
Pulse Train Output rate Not recommended
2
100 kHz (Qa.0 to Qa.3)
3
, 2 Hz min.
20 kHz (Qa.4 to Qb.1)
3
Lifetime mechanical (no load)
10,000,000 open/close cycles
--
Lifetime contacts at rated load
100,000 open/close cycles
--
Behavior on RUN to STOP
Last value or substitute value (default value 0)
Number of outputs on simultaneously
10 outputs at 55 °C horizontal or 45 °C vertical
Cable length (meters)
500 m shielded, 150 m unshielded
1
Relay group-to-group isolation separates line voltage from SELV/PELV and separates different phases up to 250 VAC
line to ground.
2
For CPU models with relay outputs, you must install a digital signal board (SB) to use the pulse outputs.
3
Depending on your pulse receiver and cable, an additional load resistor (at least 10% of rated current) may improve
pulse signal quality and noise immunity.
4
External overload protection is to limit fire hazard. Overload can damage relay or transistor output.