Introduction
In industrial automation, many DC sensors are either PNP or NPN.
This is one of the most important wiring concepts for PLC technicians to understand because it determines how current flows …
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In industrial PLC systems, sensors are commonly wired as either 2-wire or 3-wire devices.
At first, this sounds simple:
2-wire sensor = two wires3-wire sensor = three wires
But the real difference is …
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