Siemens simatic ET 200MP - Connection: 2-Wire and 3-Wire Connection of Resistance Sensors or Resistance Thermometers (RTD)

Wiring
Analog Input Module AI 8xU/I/R/RTD BA (6ES7531-7QF00-0AB0)
Manual, 03/2019, A5E44792324-AA
17
Connection: 2-wire and 3-wire connection of resistance sensors or resistance thermometers (RTD)
The example in the following figure shows the pin assignment for 2-wire and 3-wire
connections of resistance sensors or resistance thermometers.
①
3-wire connection
CHx
Channel or 8 x channel status (green/red)
②
2-wire connection
RUN
Status display LED (green)
③
Analog-to-digital converter (ADC)
ERROR
Error display LED (red)
④
Backplane bus interface
⑤
Infeed element (for shielding only)
Figure 3-5 Block diagram and pin assignment for 2-wire, 3-wire connection