Tag: 4-20 mA signal
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4–20 mA Is Not Just a Signal — It Is a Safety Decision
Industrial automation continues to evolve rapidly, incorporating digital networks, smart instrumentation, and industrial Ethernet protocols. Despite these advancements, analog current loops—specifically 4–20 mA—remain the most widely deployed communication method for transmitting process variables such as pressure, temperature, level, and flow from field instruments to control systems like PLCs, DCS, and SCADA. Textbooks and engineering training…