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到了現(xiàn)場(chǎng)后，進(jìn)行系統(tǒng)安裝前，需要考慮安裝環(huán)境是否滿足PLC的使用環(huán)境要求，這一點(diǎn)可以參考各類產(chǎn)品的使用手冊(cè)。但無論什么PLC，不都能裝設(shè)在下列場(chǎng)所：含有腐蝕性氣體之場(chǎng)所，陽(yáng)光直接照射到的地方，溫度上下值在短時(shí)間內(nèi)變化急遽的地方，油、水、化學(xué)物質(zhì)容易侵入的地方，有大量灰塵的地方，振動(dòng)大且會(huì)造成安裝件移位的地方。

         如果必須要在上面的環(huán)境使用，則要為PLC制作合適的控制箱，采用規(guī)范和必要的防護(hù)措施。如果需要在野外極低溫度下使用，可以使用有加熱功能的控制箱。如何做這些防護(hù)箱或控制箱，各制造商和和資格的系統(tǒng)集成商將會(huì)為客戶提供相應(yīng)的供應(yīng)和設(shè)計(jì)。

         在使用控制箱時(shí)，在控制箱內(nèi)OpenPLC安裝的位置要注意如下事項(xiàng)：控制箱內(nèi)空氣流通是否順暢（各裝置間須保持適當(dāng)?shù)木嚯x），變壓器、馬達(dá)控制器、變頻器等是否與PLC保持適當(dāng)距離，動(dòng)力線與信號(hào)控制線是否分離配置，組件裝設(shè)之位置是否利于日后之檢修，是否需預(yù)留空間，供日后系統(tǒng)擴(kuò)充使用。

除了上述注意事項(xiàng)之外，還有其它注意事項(xiàng)要留意。

          首先比較重要的是靜電的隔離。靜電是無形的殺手，但可能因?yàn)椴粫?huì)對(duì)人造成生命危險(xiǎn)，所以許多人常常忽視它。在中國(guó)的北方、干燥的場(chǎng)所，人體身上的靜電都是造成靜電損壞電子組件的因素。雖然你被靜電打到的話，只不過是輕微的酥麻，但這對(duì)PLC和其它任何電子器件就足以致命了。

         要避免靜電的沖擊有下列三種方式：在進(jìn)行維修或更換組件時(shí)，請(qǐng)先碰觸接地的金屬，以去除身上的靜電；不要碰觸電路板上的接頭或是IC接腳；電子組件不使用時(shí)，請(qǐng)用有隔離靜電的包裝物，將組件放置在里面。想象PLC里的元器件是一個(gè)嬌嫩的*，而那些靜電會(huì)導(dǎo)致這個(gè)*死亡，你就會(huì)更容易以正確的態(tài)度對(duì)待這個(gè)問題了。

         基座安裝（RACK）時(shí)，在決定控制箱內(nèi)各種控制組件及線槽位置后，要依照?qǐng)D紙所示尺寸，標(biāo)定孔位，鉆孔后將固定螺絲旋緊到基座牢固為止。在裝上電源供應(yīng)模塊前，必須同時(shí)注意電源線上的接地端有無與金屬機(jī)殼連結(jié)，若無則須接上。接地不好的話，會(huì)導(dǎo)致一系列的問題，靜電、浪涌、外干擾，等等。由于不接地，往往PLC也能夠工作，因此，不少經(jīng)驗(yàn)不足的工程師就誤以為接地不那么重要了。這就像登山的時(shí)候，沒有系上保護(hù)纜繩一樣，雖然你正常前進(jìn)的時(shí)候，保護(hù)纜繩沒有任何作用，但一旦你失足的時(shí)候，沒有那根繩子，你的生命就完結(jié)了。PLC的接地，就相當(dāng)于給PLC系上保護(hù)纜繩。

          在I/O模塊安裝時(shí)，須注意如下事項(xiàng)：I/O模塊插入機(jī)架上的槽位前，要先確認(rèn)模塊是否為自己所預(yù)先設(shè)計(jì)的模塊；I/O模塊在插入機(jī)架上的導(dǎo)槽時(shí)，務(wù)必插到底，以確保各接觸點(diǎn)是緊密結(jié)合的；模塊固定螺絲務(wù)必鎖緊；接線端子排插入后，其上下螺絲必須旋緊。由于現(xiàn)場(chǎng)的變壓器、電機(jī)等影響，多少會(huì)有振動(dòng)，如果這些螺絲釘松動(dòng)了，會(huì)導(dǎo)致模塊從機(jī)架中松開。

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