VS-5F
VS-5F
VS-5F
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(lái)說(shuō),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?,F(xiàn)將幾種常見(jiàn)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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