1203-GD2

1203-GD2

1203-GD2

PLC的規模和幾種常用名稱

    在實際運用中，當需要對PLC的規模作出評價時，較為普遍的作法是根據輸入／輸出點數的多少或者程序存儲器容量（字數）的大小作為評價的標準，將PLC分為小型、中型和大型（或小規模、中規模和大規模）三類，如表1所示。

表1 PLC的規模分類

存儲器容量的大小決定存儲用戶程序的步數或語句條數的多少。輸入／輸出點數與程序存儲器容量之間有內在的聯系。當輸入／輸出點數增加時，順序程序處理的信息量增大，程序加長，因而需加大程序存儲器的容量。

一般來說，數控車床、銑床、加工中心等單機數控設備所需輸入或輸出點數多在128點以下，少數復雜設備在128點以上。而大型數控機床，FMC、FMS、FA則需要采用中規模或大規模PLC。

為了突出可編程序控制器作為工業控制裝置的特點，或者為了與個人計算機“PC”或脈沖編碼器“PLC”等術語相區別，除通稱可編程控制器為“PLC”外，目前不少廠家，其中有些是的PLC廠家，還采用了與PLC不同的其他名稱。現將幾種常見名稱列舉如下：

    微機可編程控制器（Microprocessor Programmable Controller-MPC）；

    可編程接口控制器（Programmable Interface Controller-PIC）；

    可編程機器控制器（Programmable Machine Controller-PMC），

    可編程順序控制器（Programmable Seguence Controller-PSC）。

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