Siemens SIMATIC Manual page 65

3.6 Digital input module SM 321; DI 64 x DC 24 V, sinking/sourcing; (6ES7321-1BP00-0AA0)
The table below shows how channel terminals are assigned to the terminal block for module
SM321; DI 64 X DC 24 V Sinking/Sourcing.
Note
The COM x terminals must be connected on the terminal block.
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
Terminal Function
1
3
5
7
9
11
13
15
17 COM 0
19 I x+1.0
21 I x+1.1
23 I x+1.2
25 I x+1.3
27 I x+1.4
29 I x+1.5
31 I x+1.6
33 I x+1.7
35 COM 0
37 Not connected
39 Not connected
I x.0
I x.1
I x.2
I x.3
I x.4
I x.5
I x.6
I x.7
Digital modules
Terminal Function
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38 Not connected
40 Not connected
I x+2.0
I x+2.1
I x+2.2
I x+2.3
I x+2.4
I x+2.5
I x+2.6
I x+2.7
COM 1
I x+3.0
I x+3.1
I x+3.2
I x+3.3
I x+3.4
I x+3.5
I x+3.6
I x+3.7
COM 1
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