Siemens SIMATIC S7-1500 Manual page 19

Analog input module ai 4xu/i/rtd/tc st (6es7531-7qd00-0ab0)
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Connection: 2-wire connection of resistance-based sensors or thermal resistors (RTD)
The example in the figure below shows the pin assignment for 2-wire connection of
resistance sensors or thermal resistors.
2-wire connection
Analog-to-digital converter (ADC)
Backplane bus interface
Supply voltage via power supply element
Equipotential bonding cable (optional)
Figure 3-5
Block diagram and pin assignment for 2-wire connection
Analog Input Module AI 4xU/I/RTD/TC ST (6ES7531-7QD00-0AB0)
Manual, 09/2016, A5E32366209-AC
3.1 Wiring and block diagrams
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)
Wiring
19

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