操控規(guī)劃還與PLC指令體系有關(guān)。規(guī)劃大的PLC指令條數(shù)多，指令的功用也強(qiáng)，才干敷衍對點數(shù)多的體系進(jìn)行操控的需求。
操控規(guī)劃是對PLC其它功用方針起著制約效果的方針；也是PLC區(qū)分為微、小、中、大和特大型
5.3構(gòu)成模塊
PLC的構(gòu)造雖有箱體及模塊式之分，但從質(zhì)上看，箱體也是模塊，僅僅它集成了更多的功用。在此，無妨把PLC的模塊構(gòu)成當(dāng)作一切PLC的構(gòu)造功用。
這個功用意義是指某類型PLC具有多少種模塊，各種模塊都有啥標(biāo)準(zhǔn)，并各具啥特色。
通常講，規(guī)劃大的PLC，層次高的PLC模塊的品種也多，標(biāo)準(zhǔn)也多，反映它的特色的功用方針也高。但模塊的功用則單一些。相反，小型PLC、層次低的PLC模塊品種也少，標(biāo)準(zhǔn)也少，方針也低。但功用則多樣些，以致于集變成箱體。
構(gòu)成PLC的模塊是PLC的硬件根底，只要澄清所選用的PLC都具有那些模塊及其特色，才干準(zhǔn)確選用模塊，去構(gòu)成一臺完好的PLC，以滿意操控體系對PLC的請求。

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MOTOROLA MVME300    11月23日