4 to 20 mA signal

Here you will learn all about 4 to 20 ma signal transmission.

What is source and sink ?

Source and sink refer to the direction of current flow between an I/O point on an I/O module and the connected device. It is only relevant for DC circuits with positive and negative polarities because current flows both directions in an AC circuit. It is important to select a sink or source I/O module based on …

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Why 4 to 20 mA used?

Following are the reasons Why 4 to 20 mA used?​:- Current signals are often used in sensors because the current response is usually more linear than the voltage response. Current signals also typically provide a low impedance for sensors, with the benefit of better immunity to noise. Current signals can extend much further than voltage …

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