描述

2711-K5A8

到了現(xiàn)場后，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，這一點可以參考各類產(chǎn)品的使用手冊。但無論什么PLC，不都能裝設(shè)在下列場所：含有腐蝕性氣體之場所，陽光直接照射到的地方，溫度上下值在短時間內(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，振動大且會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)集成商將會為客戶提供相應(yīng)的供應(yīng)和設(shè)計。

在使用控制箱時，在控制箱內(nèi)OpenPLC安裝的位置要注意如下事項：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，動力線與信號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。除了上述注意事項之外，還有其它注意事項要留意。

首先比較重要的是靜電的隔離。靜電是無形的殺手，但可能因為不會對人造成生命危險，所以許多人常常忽視它。在中國的北方、干燥的場所，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，請先碰觸接地的金屬，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，請用有隔離靜電的包裝物，將組件放置在里面。想象PLC里的元器件是一個嬌嫩的嬰兒，而那些靜電會導(dǎo)致這個嬰兒死亡，你就會更容易以正確的態(tài)度對待這個問題了。

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2711-K5A8

描述

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