Use Case 3.2 (Sil3/Cat.4/Ple) - Siemens Simatic S7-1500 Manual

Applications of the F-I/O module
5.4 Application 3: Safety mode SIL3/Cat.4/PLe
5.4.2

Use case 3.2 (SIL3/Cat.4/PLe)

Wiring diagram – connecting a non-equivalent sensor
A non-equivalent sensor is connected to two inputs of the F-module for each process signal
(1oo2 evaluation, non-equivalent).
You can also supply the sensor by means of an external sensor supply.
The figure below shows an example of the pin assignment of the fail-safe digital input
module F-DI 16x24VDC with connection of a non-equivalent sensor.
①
Backplane bus interface
②
Microcontroller 1
Image 5-6 One non-equivalent sensor connected, internal sensor supply (top) or external sensor supply (bottom)
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified sensor.
44
WARNING
③
Microcontroller 2
④
Reverse polarity protection
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA