描述
6SN1118-0DM13-0AA1
所編的程序要符合所使用的PLC的有關(guān)的規(guī)定
主要是對(duì)指令要準(zhǔn)確地理解,正確地使用。各種PLC指令多有類似之處,但還有些差異。對(duì)于有PLC使用經(jīng)驗(yàn)的人,當(dāng)選用另一種不太熟悉的型號(hào)進(jìn)行編程設(shè)計(jì)時(shí),一定要對(duì)新型號(hào)PLC的指令重新理解一遍,否則容易出錯(cuò)。
要使所編的程序盡可能簡潔
簡短的程序可以節(jié)省內(nèi)存,簡化調(diào)試,而且還可節(jié)省執(zhí)行指令的時(shí)間,提高對(duì)輸入的響應(yīng)速度。要使所編的程序簡短,就要注意編程方法,用好指令,用巧指令,還要能優(yōu)化結(jié)構(gòu)。要實(shí)現(xiàn)某種功能,一般而言,在達(dá)到的目的相同時(shí),用功能強(qiáng)的指令比用功能單一的指令,程序步數(shù)可能會(huì)少些。
要使所編的程序盡可能清晰
這樣既便于程序的調(diào)試、修改或補(bǔ)充,也便于別人了解和讀懂程序。要想使程序清晰,就要注意程序的層次,講究模塊化、標(biāo)準(zhǔn)化。特別是在編制復(fù)雜的程序時(shí),更要注意程序的層次,可積累自己的與吸收別人的經(jīng)驗(yàn),整理出一些標(biāo)準(zhǔn)的具有典型功能的程序,并盡可能使程序單元化,像計(jì)算機(jī)中的常用的一些子程序一樣,移來移去都能用,這樣,設(shè)計(jì)起來簡單,別人也易了解。
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)測時(shí)間。PLC的掃描時(shí)間不僅包括運(yùn)行用戶程序所需的時(shí)間,而且還包括運(yùn)行系統(tǒng)程序,(如I/O處理、自監(jiān)測)所需的時(shí)間。
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。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價(jià)格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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