Technical specifications
A.4 Digital signal modules
Easy Book
108 Manual, 05/2009, A5E02486774-01
A.4 Digital signal modules
The following specifications provide a sample of the digital SM modules available for S7-
1200. Refer to the S7-1200 system manual for more information.
Sample SM 1221 digital input signal modules
General SM 1221 DI 8x24VDC SM 1221 DI 16x24VDC
Number of inputs
(Number of inputs on simultaneously)
8
(8)
16
(16)
Dimensions (W x H x D) 45 x 100 x 75 (mm) 45 x 100 x 75 (mm)
Weight 170 grams 210 grams
Power dissipation 1.5 W 2.5 W
Current consumption (SM Bus) 105 mA 130 mA
Current consumption (24 VDC) 4 mA / input used 4 mA / input used
Digital inputs Description
Input type Sink/Source (IEC Type 1 sink)
Rated voltage 24 VDC at 4 mA, nominal
Continuous permissible voltage 30 VDC, max.
Surge voltage 35 VDC for 0.5 sec.
Logic 1 signal (min.)
Logic 0 signal (max.)
15 VDC at 2.5 mA
5 VDC at 1 mA
Isolation (field side to logic)
Isolation groups
500 VAC for 1 minute
DI 8x24VDC: 2; DI 16x24VDC: 4
Filter times (ms) 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, and 12.8
(selectable in groups of 4)
Cable length (meters) 500 shielded, 300 unshielded
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