AB 1746-IB16
1 .通用性強(qiáng),控制程序可變,使用方便
PLC品種齊全的各種硬件裝置,可以組成能滿足各種要求的控制系統(tǒng),用戶不必自己再設(shè)計(jì)和制作硬件裝置。用戶在硬件確定以后,在生產(chǎn)工藝流程改變或生產(chǎn)設(shè)備更新的情況下,不必改變PLC的硬設(shè)備,只需改編程序就可以滿足要求。因此,PLC除應(yīng)用于單機(jī)控制外,在工廠自動(dòng)化中也被大量采用。
廈門莫格電氣自動(dòng)化有限公司
:張 美 霞
**
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http://www.mogget。。cn/
2.功能強(qiáng),適應(yīng)面廣
現(xiàn)代PLC不僅有邏輯運(yùn)算、計(jì)時(shí)、計(jì)數(shù)、順序控制等功能,還具有數(shù)字和模擬量的輸入輸出、功率驅(qū)動(dòng)、通信、人機(jī)對(duì)話、自檢、記錄顯示等功能。既可控制一臺(tái)生產(chǎn)機(jī)械、一條生產(chǎn)線,又可控制一個(gè)生產(chǎn)過程。
3.編程簡(jiǎn)單,容易掌握
目前,大多數(shù)PLC仍采用繼電控制形式的“梯形圖編程方式”。既繼承了傳統(tǒng)控制線路的清晰直觀,又考慮到大多數(shù)工廠企業(yè)電氣技術(shù)人員的讀圖習(xí)慣及編程水平,所以非常容易接受和掌握。梯形圖語(yǔ)言的編程元件的符號(hào)和表達(dá)方式與繼電器控制電路原理圖相當(dāng)接近。通過閱讀PLC的用戶手冊(cè)或短期培訓(xùn),電氣技術(shù)人員和技術(shù)工很快就能學(xué)會(huì)用梯形圖編制控制程序。同時(shí)還提供了功能圖、語(yǔ)句表等編程語(yǔ)言。
PLC在執(zhí)行梯形圖程序時(shí),用解釋程序?qū)⑺g成匯編語(yǔ)言然后執(zhí)行(PLC內(nèi)部增加了解釋程序)。與直接執(zhí)行匯編語(yǔ)言編寫的用戶程序相比,執(zhí)行梯形圖程序的時(shí)間要長(zhǎng)一些,但對(duì)于大多數(shù)機(jī)電控制設(shè)備來(lái)說(shuō),是微不足道的,*可以滿足控制要求。
4.減少了控制系統(tǒng)的設(shè)計(jì)及施工的工作量
由于PLC采用了軟件來(lái)取代繼電器控制系統(tǒng)中大量的中間繼電器、時(shí)間繼電器、計(jì)數(shù)器等器件,控制柜的設(shè)計(jì)安裝接線工作量大為減少。同時(shí),PLC的用戶程序可以在實(shí)驗(yàn)室模擬調(diào)試,更減少了現(xiàn)場(chǎng)的調(diào)試工作量。并且,由于PLC的低故障率及很強(qiáng)的監(jiān)視功能,模塊化等等,使維修也極為方便。
5.體積小、重量輕、功耗低、維護(hù)方便
PLC是將微電子技術(shù)應(yīng)用于工業(yè)設(shè)備的產(chǎn)品,其結(jié)構(gòu)緊湊,堅(jiān)固,體積小,重量輕,功耗低。并且由于PLC的強(qiáng)抗*力,易于裝入設(shè)備內(nèi)部,是實(shí)現(xiàn)機(jī)電一體化的理想控制設(shè)備。以三菱公司的F1-40M型PLC為例:其外型尺寸僅為305×110×110mm,重量2.3kg,功耗小于25VA;而且具有很好的抗振、適應(yīng)環(huán)境溫、濕度變化的能力?,F(xiàn)在三菱公司又有FX系列PLC,與其超小型品種F1系列相比:面積為47%,體積為36%,在系統(tǒng)的配置上既固定又靈活,輸入輸出可達(dá)24~128點(diǎn)。
廈門莫格電氣自動(dòng)化有限公司
:張 美 霞
**
歡迎您的來(lái)電
電 話:
傳 真:
地 址: 廈門市思明區(qū)檳榔西里197號(hào)第四層B19單元
http://www.mogget。。cn/
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