Digital Modules
3-40
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
3.13 Digital Input Module SM 321; DI 16 x AC 120/230 V
(6ES7321-1FH00-0AA0)
Order number
6ES7321-1FH00-0AA0
Characteristics
The SM 321; DI 16 x 120/230 VAC features the following characteristics:
• 16 inputs, electrically isolated in groups of 4
• 120/230 VAC rated input voltage
• Suitable for switches and two / three-wire proximity switches (alternating
voltage)
Terminal assignment and block diagram of the SM 321; DI 16 x 120/230 VAC
Channel number
Status display – green
M
N
N
N
M
M
M
Backplane bus
interface
N
Figure 3-13 Module View and Block Diagram of the SM 321; DI 16 x 120/230VAC
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