Current signals are less affected by electromagnetic interference (EMI) than voltage signals.
Two wires for power (+ and -) and one shared wire for the signal.
Two wires for power and two separate wires for the 4-20 mA signal. shema tokovaja petlja 4 20 ma
Converts the sensor signal into the 4-20 mA current.
The 4 mA floor allows the system to distinguish between a "zero" reading and a broken wire (0 mA). 🛠️ Main Components A functional circuit consists of four essential parts: Sensor/Transducer: Measures the physical variable. Converts the sensor signal into the 4-20 mA current
A is the gold standard for analog signaling in industrial automation. It uses a constant current to transmit data from sensors to controllers (PLCs), offering high reliability over long distances. 💡 How It Works
Can run hundreds of meters without signal loss (unlike voltage, which drops over distance). A is the gold standard for analog signaling
Typically 24V DC to drive the current through the loop.