Siemens Simatic S7-1500 Manual page 35

The figure below shows an example of the pin assignment of the fail-safe digital input
module F-DI 16x24VDC with one-channel connection of a sensor.
①
Backplane bus interface
②
Microcontroller 1
Image 5-2 One sensor connected via one channel, internal sensor supply (left) or external sensor supply (right)
To achieve SIL3/Cat.3/PLd using this wiring, you must use a qualified sensor.
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA
WARNING
5.2 Application 1: Safety mode SIL3/Cat.3/PLd
③
Microcontroller 2
④
Reverse polarity protection
Applications of the F-I/O module
35