Siemens SIMATIC Operating Instructions Manual page 78

Fail-Safe Electronic Modules
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
Sensor supply
The sensor must be supplied internally.
Table 8-12
Input channels DI 0 to DI 3: Sensor supply Vs1
Input channels DI 4 to DI 7: Sensor supply Vs2
Input channels DI 8 to DI 11: Sensor supply Vs3
Input channels DI 12 to DI 15: Sensor
supply Vs4
Wiring Diagram for Use Case 3.1 – Connecting One Two-Channel Sensor Via Two Channels
One two-channel sensor is connected via two channels to two inputs of the F-module for
each process signal (1oo2 evaluation).
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 8-13
Alternatively, two one-channel sensors can be connected via two channels (see Figure
"Wiring Diagram for F-DI Modules - Two One-Channel Sensors Connected Via Two
Channels, Internal Sensor Supply"
with mechanically separated sensors.
In order to achieve SIL3/Category 4 with this wiring, you must install a suitably qualified
sensor, for example, in accordance with IEC 60947.
78
Use Case 2: Assignment of Sensor Supply to Inputs
8/16 F-DI DC24V PROFIsafe
Vs1 DI0
S0
M
Wiring Diagram for F-DI Modules - One Two-Channel Sensor Connected Via Two
Channels, Internal Sensor Supply
WARNING
4/8 F-DI/4 F-DO DC24V/2A PROFIsafe
Input channels DI 0 to DI 3: Sensor supply Vs1
Input channels DI 4 to DI 7: Sensor supply Vs2
8/16 F-DI
4/8 F-DI/4 F-DO
DI1 DI2 DI3
S1
S2
S3
). In this case, the same process variable is measured
ET 200pro Distributed I/O System - Fail-Safe Modules
Vs2 DI4 DI5
Sensor contacts are mechanically coupled.
Operating Instructions, 05/2007, A5E00394073-02
DI6 DI7