At the same time, signal isolator has the function of voltage limiting, choke flow to the subordinate equipment, which is the faithful protection of transmitter, instrument, transducer, electron magnetic valve PLC/DCS input and output and communication interface. Signal isolator suppresses the interference of public grounding, convertor, electron magnetic valve and unknown pulse to the equipment. Signal isolator can reduce the influence of ambient noise on the test circuit. Signal isolator can protect subordinate control loop. To ensure the stability of the signal, the use of a signal isolator is particularly important. The signal will encounter various interferences during transmission. At the same time, isolate the power supply of the isolated signal to ensure absolute independence between the transformed signal, power supply, and ground. The signal isolator first modulates and transforms the signal received by the PLC through a semiconductor device, and then isolates and transforms it through a light-sensitive or magnetic-sensitive device, and then demodulates and transforms it back to the original signal or a different signal before isolation. Signal isolator is a kind of signal isolation device, which transforms input single, double current or voltage signals to isolated single, double linear current or voltage signals, and improves the electrical isolation performance between input, output and power supply. Signal isolator generally refers to the signal isolato in light-current system, to protect the subordinate signal system from the influence and interference of the superior system. Working principles of the signal isolator
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