Siemens SIMATIC S7-1200

Technical specifications
A.4 Specifications for the digital inputs and outputs
Easy Book
Manual, 03/2014, A5E02486774-AF
305
Technical data
Relay
(CPU and SM)
24 VDC
(CPU, SM, and SB)
200 KHZ 24 VDC
(SB)
Isolation groups
• CPU 1211C: 1
• CPU 1212C: 2
• CPU 1214C: 2
• CPU 1215C: 2
• SM DQ 8: 2
• SM DQ 8 Changeover:8
• SM DQ 16: 4
• CPU: 1
• SB: 1
• SM (DQ 8): 1
• SM (DQ 16): 1
1
5
Isolation resistance
100 MΩ min. when new
N/A
N/A
Isolation between open
contacts
750 VAC for 1 minute N/A N/A
Current per common CPU:
SM Relay:
• SM 1222: 10 A (DQ 8
and DQ 16)
• SM 1223 DI 8 / DQ 8
Relay: 10 A
• SM 1223 DI 16 / DQ 16
Relay: 8 A
CPU:
• SB: 1 A
• SM DQ 8: 4 A
• SM DQ 16: 8 A
0.4 A
Inductive clamp voltage N/A L+ minus 48 V,
1 W dissipation
None
Maximum relay switching
frequency
1 Hz N/A N/A
Switching delay 10 ms max. CPU:
• Qa.0 to Qa.3: 1.0 μs
max., off-to-on 3.0 μs
max., on-to-off
• Qa.4 to Qb.1: 50 μs
max., off-to-on
200 μs max., on-to-off
SB: 2 μs max. off-to-on;
10 μs max. on-to-off
SM: 50 μs max. off-to-on
200 μs max. on-to-off
1.5 μs + 300 s rise
1
1.5 μs + 300 ns fall
1
200 ns + 300 ns rise
2
200 ns + 300 ns fall
2
Lifetime mechanical (no load) Relay: 10,000,000
open/close cycles
N/A N/A
Lifetime contacts at rated load Relay: 100,000 open/close
cycles
N/A N/A