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Productivity3000 controller CPUs contain the processing power, memory, and I/O interface needed for large, complex control systems, with an integrated status display, multiple communication ports, 25 or 50MB user memory, and USB data logging.
The PLC CPU is the brain of the control system and contains a microprocessor, memory storage, and other integrated circuits that are used to execute the control program, store logic data, and communicate to external devices. PLC CPUs follow a repeated sequence of operations that perform those functions and other internal processes. Below is an example of a typical PLC scan.