Siemens Simatic S7-1500 Manual page 39

Wiring diagram – connecting two single-channel sensors via two channels
Two single-channel sensors that capture the same process value are connected to two
inputs of the F-module for each process signal (1oo2 evaluation).
You can also supply the sensors 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 two-channel connection of two single-channel sensors.
①
Backplane bus interface
②
Microcontroller 1
Image 5-4 Two single-channel sensors connected via two channels, internal sensor supply (top) or external sensor
supply (bottom)
To achieve SIL3/Cat.3/PLe using this wiring, you must use a qualified sensor.
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA
WARNING
5.3 Application 2: Safety mode SIL3/Cat.3/PLe
③
Microcontroller 2
④
Reverse polarity protection
Applications of the F-I/O module
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