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Can you use 24VDC transmitters to send 4...20mA signal to the M171 PLC?

Yes, you can use external 24VDC to power supply the transducer and connect signal to AIx.
In this case, you need to connect G and 0 VDC to create a common low voltage.With these connections you cannot damage the device and you will read correctly the transducer values.
 
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