The type of the input modules or points used by a PLC depends upon the types of the input devices used. The basic elements of a PLC include input modules or points, a central processing unit (CPU), output modules or points, and a programming device. While the specific applications vary widely, all PLCs monitor inputs and other variable values, make decisions based on a stored program, and control outputs to automate a process or machine. PLCs differ from office computers in the types of tasks that they perform, and the hardware and software they require to perform these tasks. A programmable logic controller (PLC), also referred to as a programmable controller, is the name given to a type of computer commonly used in commercial and industrial control applications.
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