MDX61B0110-5A3-4-00

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MDX61B0110-5A3-4-00

?這是一個長久以來困擾我們所有工控人的問題。我們可以參考下IT界的變量命名規(guī)范，如：如何優(yōu)雅地為程序中的變量和函數(shù)命名？然后我們也可以從中了解到一些匈牙利命名法、google風(fēng)格等稱謂，但即便你把這些規(guī)則全讀懂了，也會發(fā)現(xiàn)，好像對于我們工控項(xiàng)目來說，能參考的地方不多，因?yàn)?，他們用到的變量跟我們相比，?shù)量根本不在一個數(shù)量級！工控項(xiàng)目，用到的硬件點(diǎn)數(shù)幾百點(diǎn)是很平常的，稍微規(guī)模大一點(diǎn)，就是幾千點(diǎn)甚至上萬點(diǎn)。而除了硬點(diǎn)之外，還要有一些通訊和上位控制的虛點(diǎn)，加起來數(shù)量就更多了。這些點(diǎn)，全都相當(dāng)于高級編程語言里的全局變量。任何一個高級語言編出來的程序，功能可能比我們做到的復(fù)雜，但全局變量，絕不可能用到這么多。除非那是個新手，不懂得要模塊化編程。所以，最終工控項(xiàng)目的變量的命名規(guī)范，我們能參考到的可借鑒的經(jīng)驗(yàn)只有，用英文！即便英語不夠好，也得堅(jiān)持用英文。因?yàn)?，中文?shí)在不方便作為變量名字，沒法簡略，太長，還不容易輸入。其次也不可以使用漢語拼音。完整的拼音也是太長，而且同音詞太多引發(fā)歧義多，不能精確描述。而簡化了使用拼音首字母的連拼，寫出來后簡直是天書，除了作者自己，別人根本不可能看懂說的是什么。而且即便作者自己，時間稍微一放，回過頭來就不明白啥意思了。其實(shí)一個規(guī)范的工程項(xiàng)目，所有設(shè)備，都應(yīng)該有位號，所以在變量命名的時候，最簡單的方式是使用位號來命名，而同一位號之下的各種輸入輸出，手動、自動、啟動、停止、打開、關(guān)閉、運(yùn)行反饋、故障、開度、頻率等等，就可以統(tǒng)一規(guī)范的使用英文了，畢竟這點(diǎn)英文單詞數(shù)量還不算多。而具體到位號的命名以及鏈接了后面的功能點(diǎn)的命名，就不可避免要出現(xiàn)鏈接符號，綜合S7的符號表的命名規(guī)則和WINCC的變量的命名規(guī)則，很多符號是禁止使用或者使用中有風(fēng)險(xiǎn)的。比如:/<>!+,;等基本都不能使用。作為分隔符來說，點(diǎn)（.）是最方便的。但可惜的是，WINCC已經(jīng)缺省當(dāng)作是結(jié)構(gòu)變量的分隔符了，如果如鏈接S7-200,S7-1200的變量，不能使用結(jié)構(gòu)變量，直接通過OPC傳輸?shù)淖兞浚瑒t無法再使用點(diǎn)(.)減號（-），現(xiàn)實(shí)的文檔中經(jīng)常用，但我說有風(fēng)險(xiǎn)的恰恰就是它。

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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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選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個大概，以便學(xué)習(xí)編程時查找）；
2、由位控邏輯入手，逐漸增加定時、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個物理回路驗(yàn)證，比如變頻器+電機(jī)+測速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。

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