HM-GN00C接線臂
可編程控制器（programmable logical controller，簡(jiǎn)稱PLC）已經(jīng)越來越多地應(yīng)用于工業(yè)控制系統(tǒng)中，并且在自動(dòng)控制系統(tǒng)中起著重要的作用。所以，對(duì)PLC的正確選擇是重要的。
面對(duì)眾多生產(chǎn)廠家的各種類型PLC，它們各有優(yōu)缺點(diǎn)，能夠滿足用戶的各種需求，但在形態(tài)、組成、功能、網(wǎng)絡(luò)、編程等方面各不相容，沒有一個(gè)統(tǒng)一的標(biāo)準(zhǔn)，無法進(jìn)行橫向比較。下面提出在自動(dòng)控制系統(tǒng)設(shè)計(jì)中對(duì)PLC選型的一些看法，可以在挑選PLC時(shí)作為參考。


可以通過以下幾方面的比較，挑選到適合的產(chǎn)品。
這一點(diǎn)尤為重要。在自動(dòng)控制系統(tǒng)設(shè)計(jì)之初，就應(yīng)該對(duì)控制點(diǎn)數(shù)（數(shù)字量及模擬量）有一個(gè)準(zhǔn)確的統(tǒng)計(jì)，這往往是選擇PLC的條件，一般選擇比控制點(diǎn)數(shù)多10%~30%的PLC。這有幾方面的考慮：


1、可以彌補(bǔ)設(shè)計(jì)過程中遺漏的點(diǎn)；


2、能夠保證在運(yùn)行過程中個(gè)別點(diǎn)有故障時(shí)，可以有替代點(diǎn)；


3、將來增加點(diǎn)數(shù)的需要。


工作環(huán)境是PLC工作的硬性指標(biāo)。自控系統(tǒng)將人們從繁忙的工作和惡劣的環(huán)境中解脫出來，就要求自控系統(tǒng)能夠適應(yīng)復(fù)雜的環(huán)境，諸如溫度、濕度、噪音、信號(hào)、工作電壓等，各款PLC不盡相同。要選擇適應(yīng)實(shí)際工作環(huán)境的產(chǎn)品。

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