A20B-2902-0250

A20B-2902-0250

生產(chǎn)過(guò)程中的物理或化學(xué)變化，總是需要時(shí)間的，即無(wú)論變化過(guò)程有多快，從開(kāi)始到結(jié)束總有延遲。在常規(guī)觀測(cè)條件下的真實(shí)時(shí)間是均勻流逝且不能被操控的。工業(yè)自動(dòng)化系統(tǒng)為實(shí)現(xiàn)自動(dòng)化而執(zhí)行的各種功能任務(wù)，如測(cè)量輸入、控制輸出和控制計(jì)算等，也需要在預(yù)定的某個(gè)時(shí)刻開(kāi)始，并在預(yù)期的某段時(shí)間內(nèi)完成。控制器的各類操作，即使計(jì)算數(shù)值正確，若不能及時(shí)響應(yīng)被控對(duì)象或被控過(guò)程的需要，那么也會(huì)導(dǎo)致錯(cuò)誤而無(wú)法完成任務(wù)。

作為系統(tǒng)核心的工業(yè)控制器，一般都采用基于計(jì)算機(jī)的架構(gòu)，即以執(zhí)行存儲(chǔ)程序的方式來(lái)實(shí)現(xiàn)控制算法邏輯。當(dāng)一個(gè)計(jì)算任務(wù)，不但要求計(jì)算結(jié)果正確，而且也要求滿足時(shí)間上確定的指標(biāo)時(shí)，則可稱其具備了“實(shí)時(shí)性”的特征；所以，工業(yè)控制器具備實(shí)時(shí)計(jì)算的能力，才可對(duì)生產(chǎn)過(guò)程實(shí)施自動(dòng)化控制。

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