Fail-Safe Electronic Modules
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
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.
8/16 F-DI
4/8 F-DI/4 F-DO
1L+ M DI0 * DI1 * DI2 * DI3 * DI4 DI5 DI6 DI7 Vs1 Vs2
L+ M
S0
S1
S2
S3
1L+
Figure 8-14 Wiring Diagram for F-DI Modules - One Nonequivalent Sensor Connected
Nonequivalently Via Two Channels, Internal Sensor Supply
Alternatively, two one-channel sensors can be connected nonequivalently via two channels
(see Figure
"Wiring Diagram for F-DI Modules - Two One-Channel Sensors Connected
Nonequivalently Via Two Channels, Internal Sensor Supply"
). In this case, the same process
variable is measured with mechanically separated sensors.
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