Siemens SIMATIC S7-400 Reference Manual page 120

Digital modules
4.11 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7 421-1FH00-0AA0)
Wiring and block diagram of the SM 421; DI 16 x UC 120/230 V
Process
Figure 4-8
Specifications of the SM 421; DI 16 x UC 120/230 V
Dimensions W x H x D (mm)
Weight
Number of inputs
120
1
2
3
4
0
5
6
1
7
8
2
9
10
3
11
12
13
1N
14
15
4
16
17
5
18
19
6
20
21
7
22
23
24
2N
25
26
27
0
28
29
1
30
31
2
32
33
3
34
35
36
3 N
37
38
39
4
40
41
5
42
43
6
44
45
7
46
47
48
4 N
Wiring and block diagram of the SM 421; DI 16 x UC 120/230 V
Module
Dimensions and weight
25 x 290 x 210
Approx. 650 g
Module-specific data
16
Reference Manual, Ausgabe 11/2016, A5E00850736-08
S7-400 Automation System Module Data