The processor CPU perform all tasks by PLC functions

The processor CPU is the heart of the computer in the form of part of a microprocessor / microcontroller chip CPU. It oversees all operations required to perform all tasks performed by programmable logic control plc functions in the system.
It reads that information and input module connected to an external input device status.
It is stored in memory for later use the information.
Mathematical and logical operations it performs the specified application.
Solve the user's program, and writes the resulting value in memory.
It sends data to the external device as the output module plc, thus actuating the field hardware.
It completed peripherals and external device communication.
It performs self-diagnosis.