Programmable controller ( PLC) Has the characteristics and classification

Programmable controller ( PLC) Has the following characteristics ( 1) PLC is a kind of special order to the industrial control microcomputer system. ( 2) PLC is designed for use in harsh industrial environments, so has a strong anti-interference ability. ( 3) Compact structure, small volume, easy to load the machine within or electrical box, easy to realize the complex control logic, and mechanical and electrical integration of the nc machine tools. ( 4) The ladder diagram programming way. ( 5) PLC can be connected to the programmer, personal computer, etc, can be easily implemented procedure of display, edit, diagnosis, storage and delivery etc. A lot of PLC products, specifications are not unified, can be classified from the aspects of structure, principle, size, etc. Points, from the perspective of numerical control machine tool application programmable controller can be divided into two kinds: one kind is in the manufacturer of the CNC numerical control device ( CNC) Designed and PLC combination 'built-in' ( 构建- - - - - - inType) PLC controller； Another type of PLC is a professional manufacturer of products, their input/output signal interface specification, input/output points, storage capacity and computing program and control functions can satisfy the control requirement of the nc machine tool, called 'independent model' ( Sand— 单独类型) PLC。
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