Siemens S7-300 - Page 3

3
Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Terminal connection diagram and block diagram of the
SM 321; DI 16 DC 24 V
Status display – green
Channel number
Backplane bus
interface
L+
M
24 V
SF
V
s
V
s
Sensor supplies Vs - green
M
M
L+
V
s
V
s
L +
Fault indicator – red
Wire break
detection
Wire break
detection
Figure 1 Module view and block diagram of the SM 321; DI 16 DC 24 V