1203-GD2

1203-GD2

1203-GD2

PLC的規(guī)模和幾種常用名稱

    在實(shí)際運(yùn)用中，當(dāng)需要對(duì)PLC的規(guī)模作出評(píng)價(jià)時(shí)，較為普遍的作法是根據(jù)輸入／輸出點(diǎn)數(shù)的多少或者程序存儲(chǔ)器容量（字?jǐn)?shù)）的大小作為評(píng)價(jià)的標(biāo)準(zhǔn)，將PLC分為小型、中型和大型（或小規(guī)模、中規(guī)模和大規(guī)模）三類，如表1所示。

表1 PLC的規(guī)模分類

存儲(chǔ)器容量的大小決定存儲(chǔ)用戶程序的步數(shù)或語(yǔ)句條數(shù)的多少。輸入／輸出點(diǎn)數(shù)與程序存儲(chǔ)器容量之間有內(nèi)在的聯(lián)系。當(dāng)輸入／輸出點(diǎn)數(shù)增加時(shí)，順序程序處理的信息量增大，程序加長(zhǎng)，因而需加大程序存儲(chǔ)器的容量。

一般來說，數(shù)控車床、銑床、加工中心等單機(jī)數(shù)控設(shè)備所需輸入或輸出點(diǎn)數(shù)多在128點(diǎn)以下，少數(shù)復(fù)雜設(shè)備在128點(diǎn)以上。而大型數(shù)控機(jī)床，FMC、FMS、FA則需要采用中規(guī)模或大規(guī)模PLC。

為了突出可編程序控制器作為工業(yè)控制裝置的特點(diǎn)，或者為了與個(gè)人計(jì)算機(jī)“PC”或脈沖編碼器“PLC”等術(shù)語(yǔ)相區(qū)別，除通稱可編程控制器為“PLC”外，目前不少?gòu)S家，其中有些是的PLC廠家，還采用了與PLC不同的其他名稱。現(xiàn)將幾種常見名稱列舉如下：

    微機(jī)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(jī)器控制器（Programmable Machine Controller-PMC），

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

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