Siemens SIMATIC S7-400 Reference Manual page 98

Digital modules
4.7 Digital input module SM 421; DI 32 x DC 24 V (6ES7421-1BL01-0AA0)
Connection and circuit diagram for SM 421; DI 32 x 24 V DC
L+
M
Figure 4-2
Technical specifications for SM 421; DI 32 x DC 24 V
Dimensions W x H x D (mm)
Weight
98
Process
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
Connection and circuit diagram for SM 421; DI 32 x 24 V DC
Module
0
1
2
3
4
5
6
7
M
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
M
Dimensions and weight
25 x 290 x 210
ca. 500 g
Module-specific data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
S7-400 Automation System Module Data