Siemens SIMATIC S7 System Manual page 764

Technical specifications
A.6 Digital signal boards
Table A- 134 Digital inputs
Technical data
Number of inputs
Type
Rated voltage
Continuous permissible voltage
Surge voltage
Logic 1 signal (min.)
Logic 0 signal (max.)
Isolation (field side to logic)
Isolation groups
Filter times
Number of inputs on simultane-
ously
Cable length (max.), in meters
764
SB Digital 2 x Inputs / 2 x Digital Outputs (DT04)
2
Sink (IEC Type 1 sink)
24 V DC at 4 mA, nominal
30 V DC max.
35 V DC for 0.5 sec.
15 V DC at 2.5 mA
5 V DC at 1 mA
500 V AC for 1 minute
1
Individually selectable on each channel:
μs: 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 12.8
ms: 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 12.8
2
Shielded: 500 m normal inputs
Unshielded: 300 m normal inputs
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART