Siemens SIMATIC ET 200S Installation And Operating Manual page 132

Fail-Safe Modules
7.5 4/8 F-DI VDC24V PROFIsafe Digital Electronic Module
Wiring Diagram for Application 3.2 - Connecting Two One-Channel Sensors Nonequivalently via Two
Channels
Two channels of two 1-channel sensors are connected nonequivalently to two inputs of the
F-I/O module for each process signal (1oo2 evaluation).
The left-hand channels on the F-module (DI0 through DI3) supply the wanted signals. If no
faults are detected, these signals will be available in the I/O area for inputs on the F-CPU.
Figure 7-32
Warning
To achieve AK6/SIL3/Category 4 using this wiring, you must use a sensor qualified for this
class.
Assignable Parameters for Use Case 3.2
Set the parameter "evaluation of sensors" to "1oo2 evaluation" for the corresponding input
and the parameter "type of sensor interconnection" to "2-channel nonequivalent". Activate
the "short circuit test" parameter.
7-72
Wiring Diagram for EM 4/8 F-DI DC24V - Two One-Channel Sensors Connected
Nonequivalently via Two Channels, Internal Sensor Supply
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
ET 200S Distributed I/O System - Fail-Safe Modules