Siemens Simatic S7-1500 - Security Integrated

Wiring
Analog Input Module AI 8xU/R/RTD/TC HF (6ES7531-7PF00-0AB0)
20 Manual, 09/2016, A5E36647959-AB
Block diagram and pin assignment for voltage measurement
The example in the following figure shows the pin assignment for voltage measurement.
①
Analog-to-Digital Converter (ADC)
CHx
Channel or 9 x channel status (green/red)
②
Electrical isolation
RUN
Status display LED (green)
③
Backplane bus interface
ERROR
Error display LED (red)
④
Supply voltage via power supply element
PWR
LED for power supply (green)
⑤
Equipotential bonding cable (optional)
Figure 3-2 Block diagram and pin assignment for voltage measurement