Digital Modules
3-38
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
3.12 Digital Input Module SM 321; DI 16 x VDC 48-125;
(6ES7321-1CH20-0AA0)
Order number: “Standard module”
6ES7321-1CH20-0AA0
Order number: “SIPLUS S7-300-Module”
6AG1321-1CH20-2AA0
Characteristics
The SM 321; DI 16 x 48-125 VDC features the following characteristics:
• 16 inputs, isolated in groups of 8
• Rated input voltage 48 to 125 VDC
• Suitable for switches and two / three / four-wire BEROs (proximity switches).
Terminal assignment and block diagram of the SM 321; DI 16 x 48-125 VDC
Status display – green
Channel number
Backplane bus
interface
M
2M
48 to 125 V
M
1M
48 to 125 V
12
13
14
15
16
17
18
19
20
2
3
4
5
6
7
8
9
10
Figure 3-12 Module View and Block Diagram of SM 321; DI 16 x 48-125 VDC
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