Siemens Simatic S7-400 - Manual (Page 188)

Digital Modules
4-66
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Terminal Assignment Diagram of the SM 422; DO 16 20-125 VDC/1.5 A
1
2
3
4
0
Byte 0
5
6
1
7
8
2
9
10 3
11
13 L1+
12
14
15
4
16
17
5
18
19
6
20
21
7
22
24
23
26
27
28
29
30
31
32
33
34
36
35
38
39
40
41
42
43
44
45
46
48
47
25
37
0
1
2
3
4
5
6
7
M1
–+
L1+
Byte 1
L2+
M2
–+
L2+
M2
Process Module
Data register and bus control
LED control
Figure 4-16 Terminal Assignment Diagram of the SM 422; DO 16 20-125 VDC/1.5 A