Siemens Simatic S7-300 - Module View and Block Diagram of Digital Input Module SM 321; DI 16 X 24 VDC

Digital Modules
3-23
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Terminal assignment and block diagram of the SM 321; DI 16 x 24 VDC
Status display – green
Channel number
Backplane bus
interface
L+
M
24 V
SF
V
s
V
s
Encoder supplies Vs
–
green
M
M
L+
V
s
V
s
L +
Fault indicator – red
Broken–wire
detection
Broken–wire
detection
Figure 3-6 Module View and Block Diagram of Digital Input Module SM 321; DI 16 x 24 VDC