ABB  NDBU-85  
``` `

1、要使所編的程序合乎PLC的性能指標(biāo)及工作要求

所編程序的指令條數(shù)要少于所選用的PLC內(nèi)存的容量，即程序在PLC中能放得下，所用的輸入、輸出點(diǎn)數(shù)要在所選用PLC的I/O點(diǎn)數(shù)范圍之內(nèi)，PLC的掃描時(shí)間要少于所選用PLC的程序運(yùn)行監(jiān)測(cè)時(shí)間。PLC的掃描時(shí)間不僅包括運(yùn)行用戶(hù)程序所需的時(shí)間，而且還包括運(yùn)行系統(tǒng)程序，（如I/O處理、自監(jiān)測(cè)）所需的時(shí)間。

2、所編程序能夠循環(huán)運(yùn)行

PLC的工作特點(diǎn)是循環(huán)反復(fù)、不間斷地運(yùn)行同一程序。運(yùn)行從初始化后的狀態(tài)開(kāi)始，待控制對(duì)象完成了工作循環(huán)，則又返回初始化狀態(tài)。只有這樣才能使控制對(duì)象在新的工作周期中也得到相同的控制。

①廈門(mén)莫格電氣自動(dòng)化有限公司 
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