What is a 4–20 mA Signal? Working Principle, Wiring & Industrial Applications
The post describes two types of wiring in industrial applications: power wiring and control wiring. Power wiring carries heavy current at higher voltages, while control wiring involves low current, guiding power to the control systems. It discusses the 4-20mA signal standard as a means to transmit process variables with applications in temperature and pressure control systems. The 4-20mA range allows for precise control, distinguishing valid measurements from faults by starting at 4mA. The summary covers advantages, common uses, troubleshooting, and FAQs related to this signal standard, emphasizing its reliability and importance in industrial automation.