Siemens SIMATIC S7-1500 Manual page 18

Wiring
Block diagram and pin assignment for 2-wire transmitter for current measurement
The example in the following figure shows the pin assignment for current measurement with
2-wire transmitters.
①
Wiring 2-wire transmitter
②
Analog-to-Digital Converter (ADC)
③
Backplane bus interface
④
Supply voltage via power supply element
⑤
Equipotential bonding cable (optional)
Figure 3-4 Block diagram and pin assignment for 2-wire transmitter for current measurement
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CHx Channel or 8 x channel status (green/red)
RUN Status display LED (green)
ERROR Error display LED (red)
PWR LED for power supply (green)
Analog Input Module AI 8xU/I HS (6ES7531-7NF10-0AB0)
Manual, 12/2016, A5E03484886-AE