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plc is rugged and designed to withstand vibrations, temperature, humidity, and noise.2. Have interfacing for inputs and outputs already inside the controller.3. PLCs are easily programmed and have an easily understood programming
language
Mainly because they're more rugged than the microcontrollers and have large number of I/Os.
A PLC is a programmable controller like an Arduino that is mainly used for industrial automation. However, the main difference between a PLC and an Arduino is their price, as the PLC usually has 100 times the price of a Αrduino. The PLC has a better processor power & memory, can handle more current in the I/O ports, the ports are optocoupled, it is more robust, it is closed architecture, it comes with industrial certificates, safety features etc.If you are dealing with an industrial application, PLC is the way to go. If you are looking for a hobby project or small research project you can use an Arduino controller that costs as low as 15$
