Digital Modules
3-101
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Protection of contacts against overvoltages
You protect the contacts against overvoltages by inserting jumpers (SJ) on the
module between terminals 3 and 4, 7 and 8, 12 and 13 etc. (refer to Figure 3-32).
Terminal assignment and block diagram of the SM 322; DO 8 x Rel. 230 VAC/5A
Channel
number
Status display – green
24V
1L+
1L+
1M
Backplane bus interface
2L+
2M
SF
SF
11
12
13
14
15
16
17
18
19
20
Fault indicator – red
1M
SJ
1L+
1M
SJ
1L+
1M
SJ
1L+
1M
SJ
SJ
SJ
1L+
1M
1L+
1M
1L+
1M
1L+
1M
SJ
SJ
24V
31
32
33
34
35
36
37
38
39
40
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
Figure 3-32 Module View and Block Diagram of the SM 322; DO 8 x Rel. 230 VAC/5A
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