Siemens S7-300 - Page 96

Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
96 Installation and Operating Manual, 01/2010, A5E00085586-10
Wiring scheme for application 6 with two-channel connection of one two-channel sensor
One two-channel sensor is connected via two channels to the two digital modules for each
process signal (1oo2 evaluation). The sensors must be connected to an external sensor
supply.

/
0
',
',
/
0
',
',
0
/
0
/
60
',['&9
60
',['&9
/HIW&KDQQHOWR
5LJKW&KDQQHOWR
6HQVRUFRQWDFWVDUHPHFKDQLFDOO\FRXSOHGDOWHUQDWLYHO\\RXFDQFRQQHFWWZR
VLQJOHFKDQQHOVHQVRUV
/HIW&KDQQHOWR
5LJKW&KDQQHOWR
Figure 8-20 Wiring scheme of the SM 326; DI 24 x DC 24V for application 6 – one two-channel
sensor two-channel connection
WARNING
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified sensor.