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The core advantages of signal isolators are: "eliminating interference, ensuring safety, and flexible allocation".
It fundamentally solves the following problems by establishing electrical isolation barriers between input, output, and power supply (usually achieved through optocouplers, transformers, etc.):
Solving the grounding loop problem: When there are multiple grounding points in the system, a grounding loop current will be generated due to potential difference, which will be superimposed on the signal, causing difficult to troubleshoot signal fluctuations and measurement errors. The isolator cut off this loop.
Suppressing common mode interference: It can effectively suppress various electromagnetic interference and common mode noise transmitted on site, providing a "clean" signal for the control system.