
Digital modules
4.10 Digital input module SM 421; DI 16 x UC 24/60 V (6ES7421-7DH00-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
125
Wiring and Block Diagram of the SM 421; DI 16 x UC 24/60 V
L
N
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
1 N
1
2
4 N
4
5
6
0
2 N
3 N
3
5 N
6 N
7 N
7
8 N
0
9 N
1
10 N
2
11 N
3
12 N
4
13 N
5
14 N
6
15 N
7
16 N
INTF
EXTF
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
N
L
Process
Module
Front connector jumper
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Adaptation
Data register and bus control
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Input
Diagnostics
Figure 4-6 Wiring and Block Diagram of the SM 421; DI 16 x UC 24/60 V
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