Siemens Simatic S7-1500 Manual page 38

Applications of the F-I/O module
5.3 Application 2: Safety mode SIL3/Cat.3/PLe
Wiring diagram – connecting a two-channel sensor equivalent
A two-channel sensor is connected equivalent to two inputs of the F-module for each
process signal (1oo2 evaluation).
You can also supply one or both sensor switches 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 equivalent connection of a two-channel sensor.
①
②
Image 5-3
38
Backplane bus interface
Microcontroller 1
One two-channel sensor connected equivalently, internal sensor supply (top) or external
sensor supply (bottom)
③
Microcontroller 2
④
Reverse polarity protection
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA