Siemens SIMATIC S7-1500 Manual page 18

Wiring
3.1 Wiring and block diagrams
Connection: 2-wire transmitters 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 current measurement with 2-wire transmitter
18
CHx Channel or 4 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 4xU/I/RTD/TC ST (6ES7531-7QD00-0AB0)
Manual, 09/2016, A5E32366209-AC