Siemens SIMATIC Operating Instructions Manual page 79

Assignable Parameters for Use Case 3.1
Set the "Evaluation of the sensors" parameter to "1oo2 evaluation" and the "Type of sensor
interconnection" parameter to "2-channel equivalent" for the relevant input. Enable the
"Short-circuit test" parameter.
Wiring Diagram for Use Case 3.2 – Connecting One Nonequivalent Sensor Via Two Channels
Nonequivalently
Eight process signals can be connected to an 8/16 F-DI DC24V PROFIsafe electronic
module, 4 process signals to a 4/8 F-DI/4 F-DO DC24V/2A PROFIsafe electronic module,
and 2 process signals to an F-Switch PROFIsafe. One sensor is connected nonequivalently
via two channels to two inputs of the F-module for each process signal (1oo2 evaluation).
The left channels on the F-module (DI 0 to DI 3 or DI 8 to DI 11) supply the wanted signals. If
no faults are detected, these signals will be available in the I/O area for inputs in the F-CPU.
Note
You must use internal sensor supply Vs1 (or Vs3) to supply voltage to the sensor.
Connection to Vs2 (or Vs4) is not possible.
The wiring is carried out at the appropriate connection module.
The figure below illustrates an example wiring diagram for channel groups 1 and 2.
1L+
1L+ M
L+
Figure 8-14
Alternatively, two one-channel sensors can be connected nonequivalently via two channels
(see Figure
Nonequivalently Via Two Channels, Internal Sensor Supply"
variable is measured with mechanically separated sensors.
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
Vs1 DI0 *
S0
M
Wiring Diagram for F-DI Modules - One Nonequivalent Sensor Connected
Nonequivalently Via Two Channels, Internal Sensor Supply
"Wiring Diagram for F-DI Modules - Two One-Channel Sensors Connected
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
8/16 F-DI
4/8 F-DI/4 F-DO
DI1 * DI2 * DI3 * Vs2
S1
S2
S3
Fail-Safe Electronic Modules
DI4 DI5 DI6
). In this case, the same process
DI7
79