Siemens SIMATIC S7-400 Reference Manual page 123
Automation system module
data
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Connection and circuit diagram for SM 421; DI 16 x UC 120/230 V
Process
Figure 4-9
Technical specifications for SM 421; DI 16 x UC 120/230 V
Dimensions W x H x D (mm)
Weight
Number of inputs
Cable length
● unshielded
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
4.12 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7421-1FH20-0AA0)
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
3N
37
38
39
4
40
41
5
42
43
6
44
45
7
46
47
48
4N
Connection and circuit diagram for SM 421; DI 16 x UC 120/230 V
Module
Dimensions and weight
25 x 290 x 210
ca. 650 g
Module-specific data
16
600 m
Digital modules
123
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