The 4-20 mA current loop interface is a widely used standard for transmitting analog signals, particularly in industrial process control and automation systems. This signaling method is favored for its simplicity and reliability in conveying sensor data over long distances.
One of the main advantages of the 4-20 mA interface is its immunity to electrical noise, making it suitable for harsh industrial environments. The use of current rather than voltage also means that signal degradation over long distances is minimized. This makes the 4-20 mA standard a reliable choice for connecting sensors and transmitters to controllers, PLCs, and other monitoring equipment, ensuring accurate and efficient data transmission in various applications.