1. NAM1.3-15安全貫穿于整個(gè)過(guò)程
安全問(wèn)題,最重要的是思想上的重視;然后,還要輔之以技術(shù)手段的保證。這里,雖言之以“輔”,卻不可輕視,須知“保證”二字的份量;如此而說(shuō),是為了突出“思想上重視”的重要性。
NAM1.3-15在對(duì)控制對(duì)象及控制工藝進(jìn)行深入全面了解的基礎(chǔ)上,考慮操作安全,盡最大努力解決操作或動(dòng)作過(guò)程中的偶然因素和不安全因素,編制出符合工藝,安全可靠,利于操作,方便維修的控制程序。當(dāng)然,安全問(wèn)題,制度上的完善也是一個(gè)方面。
2.先期準(zhǔn)備工作是前提
NAM1.3-15先期準(zhǔn)備工作的重要性,相信有多位朋友都知道,包括對(duì)控制要求的了解和整體設(shè)計(jì)思路、甚至于相關(guān)知識(shí)和基礎(chǔ)知識(shí)的掌握,可參見(jiàn)前面的兩個(gè)小結(jié)。同樣地,許多朋友都會(huì)曉得,首先要先期準(zhǔn)備工作,其次是掌握PLC硬件接線和軟件的操作使用。而廣義地說(shuō),學(xué)習(xí)PLC也是一個(gè)日積月累的過(guò)程,也可以歸結(jié)到“先期準(zhǔn)備工作”中。這叫未雨綢繆,機(jī)遇偏愛(ài)有所準(zhǔn)備的人。
3.程序結(jié)構(gòu)須合理安排
好的程序,結(jié)構(gòu)應(yīng)清晰合理,能夠便于程序的閱讀和調(diào)試;當(dāng)程序量較大,或控制較為復(fù)雜時(shí),須注意設(shè)計(jì)方法和編程技巧的應(yīng)用?!俺绦蚣軜?gòu)很重要”,這就是說(shuō)子程序的應(yīng)用,不僅減少了程序容量,還增加了可讀性,方便了程序的調(diào)試修改。平常在練習(xí)編程或編制小的程序時(shí),如果有時(shí)間,就可以做這方面的訓(xùn)練,比如采用不同的方案、不同的思路進(jìn)行比對(duì),以開(kāi)闊思路和取得經(jīng)驗(yàn)。
4.程序調(diào)試是組成部分
NAM1.3-15編制的程序,必須經(jīng)過(guò)調(diào)試,以發(fā)現(xiàn)錯(cuò)誤、完善功能。調(diào)試分為模擬調(diào)試(模仿實(shí)際情況)和現(xiàn)場(chǎng)調(diào)試;只有經(jīng)過(guò)現(xiàn)場(chǎng)調(diào)試運(yùn)行認(rèn)可的程序,才是可用的程序。另外,調(diào)試時(shí)的考慮必須全面,盡可能列出足夠多的情況,包括誤操作、元器件不良、以及突然斷電等,并注意PLC與外圍電路的配合。PLC是控制系統(tǒng)的一個(gè)組成部分,所以必須置于整個(gè)系統(tǒng)中考慮。
5.在平時(shí)的學(xué)習(xí)和積累
一些知識(shí)和經(jīng)驗(yàn),需依靠平時(shí)的積累,這是許多朋友的實(shí)際體驗(yàn)。而PLC編程本身,特別是小型PLC的基本應(yīng)用,一般均感覺(jué)不難。像一些人用過(guò)三菱FX2N、西門(mén)子200和松下FP0,感覺(jué)基本指令上手很容易;對(duì)功能指令,通過(guò)查手冊(cè)和進(jìn)行簡(jiǎn)單的試驗(yàn),也能夠應(yīng)對(duì)大多數(shù)的編程需要。但中型PLC,用到的知識(shí)要多一些。
還有一些經(jīng)驗(yàn)的人強(qiáng)調(diào)了動(dòng)手的必要性,“在干中學(xué),在學(xué)中干,如此反復(fù)收效頗豐”;“感覺(jué)還是要實(shí)際操作學(xué)習(xí)快,不干就忘了”。還要利用已有條件進(jìn)行學(xué)習(xí)。其實(shí)在維修中,也可以取得許多經(jīng)驗(yàn),比如他人好的方法和不足之處,包括程序的功能和電路的設(shè)計(jì),這些都可以用于今后的設(shè)計(jì)中。
6.結(jié)語(yǔ)
NAM1.3-15本文所談是一個(gè)大方向,把握了這個(gè)大方向,對(duì)于入門(mén)者來(lái)說(shuō),就可開(kāi)始熟悉指令和進(jìn)行編程試驗(yàn)了。有必要再重復(fù)前面的一段話:這些是一種概括和提煉,對(duì)于初學(xué)者來(lái)說(shuō),還需要在實(shí)際工作中去體會(huì)和驗(yàn)證,所以主要是起一種指導(dǎo)作用。但是,學(xué)一門(mén)技術(shù),開(kāi)始時(shí)就要養(yǎng)成良好的習(xí)慣、掌握好的方法,所以說(shuō)一些原則很有用。
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NAM1.3-15
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