Siemens Simatic S7-300 - Page 181

Digital Modules
3-97
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Terminal assignment and block diagram of the SM 322; DO 8 x Rel. 230 VAC
Status display – green
Channel number
U
M
Backplane bus
interface
M
U
24 V
M
Figure 3-31 Module View and Block Diagram of the SM 322; DO 8 x REL. 230 VAC