Siemens SIMATIC S7 Functional Safety Manual page 174

Technical specifications
A.3 Fail-Safe signal module (SM) technical specifications
Table A- 50 Digital inputs
Model
Number of inputs:
1oo1 evaluation
•
1oo2 evaluation
•
Type
Rated voltage
Surge voltage
Logic 1 signal
Logic 0 signal
Connection of 2-wire proximity switch (BERO):
Permissible quiescent current
•
Filter times
Number of inputs on simultaneously
Cable length (meters)
1
With an input delay of 0.8 ms, shielded cables must be used for the digital inputs and the sensor supply.
1
174
SM 1226 F-DI 16 x 24 VDC
16 maximum
8 maximum
Note: You can individually assign each pair of inputs "a.x"
and "b.x" as a single 1oo2 channel or as 2 separate 1oo1
channels.
Sink (IEC 61131-2 Type 1)
24 VDC at 5 mA, nominal
35 VDC for 0.5 s
15 VDC at 3 mA to 30 VDC at 6 mA
-30 VDC to 5 VDC
Not possible
0.5 mA maximum
0.8 ms
•
1.6 ms
•
3.2 ms
•
6.4 ms
•
12.8 ms
•
Note: Refer to "Fail-Safe signal module (SM) response times"
(Page 197) for further information.
16 inputs at 55 °C horizontal or 45 °C vertical
200 m unshielded with input filter time of 1.6 ms to 12.6
•
ms
200 m shielded with input filter time of 0.8 ms to 12.6 s
•
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
1