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毕业设计资料 英译汉The PLCNew Technology,Greater Data Sharing
The PLC : New Technology,Greater Data Sharing Ⅰ Introduction to Programmable Controllers Its always good to get an overview of where designs have been and were they are going.? To do this its essential to get a birds eye view of the concepts and processes that make the PLC so valuable in industrial control.? Pitting PLCs against other control types will also serve to show the pros and cons for different applications. ⒈ Definition of a PLC 1.1 What is a PLC? A Programmable Logic Controller, or PLC for short, is simply a special computer device used for industrial control systems. They are used in many industries such as oil refineries, manufacturing lines, conveyor systems and so on. Where ever there is a need to control devices the PLC provides a flexible way to softwire the components together. Concretely speaking, Programmable Logic Controllers (PLC) continue to evolve as new technologies are added to their capabilities. The PLC started out as a replacement for banks of relays. Gradually, various math and logic manipulation functions were added. Today they are the brains of the vast majority of automation, processes and special machines. PLCs now incorporate smaller cases, faster CPUs, networking and various internet technologies. The basic units have a CPU (a computer processor) that is dedicated to run one program that monitors a series of different inputs and logically manipulates the outputs for the desired control.? They are meant to be very flexible in how they can be programmed while also providing the advantages of high reliability (no program crashes or mechanical failures), compact and economical over traditional control systems. You can think of PLC technology as a small industrialized computer that has been highly specialized for reliability in the factory environment. At its core, a PLC looks at digital and analog sensors and switches (inputs), reads its control program, makes mathematical calculations and as a result controls various hardware (output
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