Siemens SIMATIC S7-1500R/H Getting Started page 17

Introduction to the example
1.5 Wiring diagram for a tunnel section
Connecting sensors for light intensity and air pollution level
The following figure shows the wiring of the sensors for measuring the light intensity and air
pollution level on the AI 4xU/I 2-wire ST analog input module
Figure 1-6
16
Wiring of sensors for light intensity and air pollution level
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S7-1500R/H redundant system
Getting Started, 10/2018, A5E44910930-AA