Siemens SIMATIC ET 200S Installation And Operating Manual page 130

Fail-Safe Modules
7.5 4/8 F-DI VDC24V PROFIsafe Digital Electronic Module
Wiring Diagram for Application 3.1 - Connecting a Two-channel Sensor to Two Channels
Two channels of a 2-channel sensor are connected to two inputs of the F-module for each
process signal (1oo2 evaluation).
The wiring is carried out on the appropriate terminal module.
Figure 7-30
Alternatively two channels of two single-channel sensors can be connected (see figure
EM 4/8 F-DI DC24V wiring diagram - two channels of two single-channel sensors connected,
internal power supply
mechanically separate sensors.
Warning
To achieve AK6/SIL3/Category 4 using this wiring, you must use a sensor qualified for this
class.
Assignable Parameters for Use Case 3.1
Set the parameter "evaluation of sensors" to "1oo2 evaluation" and the parameter "type of
sensor interconnection" to "2-channel equivalent" for the relevant input. Activate the "short
circuit test" parameter.
7-70
Wiring Diagram EM 4/8 F-DI DC24V PROFIsafe - Two Channels of a 2-Channel Sensor
Connected, Internal Sensor Power Supply
In this case, the same process variable is acquired with two
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
ET 200S Distributed I/O System - Fail-Safe Modules