Working with Self-powered and Loop-powered Sensors

Quick, suppose you need to monitor sensors with a milliamp current signal. Should you get a SNAP-AIMA, a SNAP-AIMA-i, or a SNAP-AIMA-iSRC analog input module? Or what about a SNAP-AIMA-4 or a SNAP-AIMA-32?

All of these modules provide -20 mA to +20 mA analog current input connections. So which one do you need?

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