How does plc work exactly?

How does plc work exactly?
Microprocessor is the heart of any computer,it is also called as processor, or CPU. After reading the input signal, the CPU follows the instructions, that a programmer or operator has stored in the PLC’s memory. When the PLC is running and following the programmer’s instructions, it is called as solving the program.

Is there a need for future growth?
A PLC can easily accept a new module in a slot or get an expansion base.

Example of plc wiring?
A diagram that shows the locations that inputs and outputs are physically connected to PLC terminals. The physical locations do not directly affect the circuit logic.

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