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6DD1607-0EA0

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品牌: 西門子
西門子: 6DD1607-0EA0
單價: 999.00元/件
起訂: 1 件
供貨總量: 99 件
發貨期限: 自買家付款之日起 3 天內發貨
所在地: 福建 廈門市
有效期至: 長期有效
最后更新: 2017-09-29 16:32
瀏覽次數: 202
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6DD1607-0EA0



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廈門莫格電氣自動化有限公司

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P經濟合算 


高新技術的使用必將帶來巨大的社會效益與經濟效益,這是科技是第一生產力的體現,也是高新技術生命力之所在。PLC也是如此。

盡管使用PLC首次投資要大些,但從全面及長遠看,使用PLC還是經濟的。這是由于:

使用PLC的投資雖大,但它的體積小、所占空間小,輔助設施的投進少;使用時省電,運行費少;工作可靠,停工損失少;維修簡單,維修費少;還可再次使用以及能帶來附加價值等等,從中可得更大的回報。所以,在多數情況下,它的效益是可觀的。

可編程控制器基本應用

最初,PLC主要用于開關量的邏輯控制。隨著PLC技術的進步,它的應用領域不斷擴大。

如今,PLC不僅用于開關量控制,還用于模擬量及數字量的控制,可采集與存儲數據,還可對控制系統進行監控;還可聯網、通訊,實現大范圍、跨地域的控制與治理。PLC已日益成為產業控制裝置家族中一個重要的角色。

1 用于開關量控制

PLC控制開關量的能力是很強的。所控制的進出點數,少的十幾點、幾十點,多的可到幾百、幾千,甚至幾萬點。由于它能聯網,點數幾乎不受限制,不管多少點都能控制。

所控制的邏輯題目可以是多種多樣的:組合的、時序的;即時的、延時的;不需計數的,需要計數的;固定順序的,隨機工作的;等等,都可進行。

PLC的硬件結構是可變的,軟件程序是可編的,用于控制時,非常靈活。必要時,可編寫多套,或多組程序,依需要調用。它很適應于產業現場多工況、多狀態變換的需要。

用PLC進行開關量控制實例是很多的,冶金、機械、輕工、化工、紡織等等,幾乎所有產業行業都需要用到它。目前,PLC首用的目標,也是別的控制器無法與其相比的,就是它能方便并可靠地用于開關量的控制。

2 用于模擬量控制

模擬量,如電流、電壓、溫度、壓力等等,它的大小是連續變化的。產業生產,特別是連續型生產過程,常要對這些物理量進行控制。

作為一種產業控制電子裝置,PLC若不能對這些量進行控制,那是一大不足。為此,各PLC廠家都在這方面進行大量的開發。目前,不僅大型、中型機可以進行模擬量控制,就是小型機,也能進行這樣的控制。

PLC進行模擬量控制,要配置有模擬量與數字量相互轉換的A/D、D/A單元。它也是I/O單元,不過是特殊的I/O單元。

A/D單元是把外電路的模擬量,轉換成數字量,然后送進PLC。D/A單元,是把PLC的數字量轉換成模擬量,再送給外電路。

作為一種特殊的I/O單元,它仍具有I/O電路抗干擾、內外電路隔離,與輸進輸出繼電器(或內部繼電器,它也是PLC工作內存的一個區。可讀寫)交換信息等等特點。

這里的A/D中的A,多為電流,或電壓,也有為溫度。D/A中的A,多為電壓,或電流。電壓、電流變化范圍多為0~5V,0~10V,4~20mA。有的還可處理正負值的。

這里的D,小型機多為8位二進制數,中、大型多為12位二進制數。

A/D、D/A有單路,也有多路。多路占的輸進輸出繼電器多。

有了A/D、D/A單元,余下的處理都是數字量,這對有信息處理能力的PLC并不難。中、大型PLC處理能力更強,不僅可進行數字的加、減、乘、除,還可開方,插值,還可進行浮點運算。有的還有PID指令,可對偏差制量進行比例、微分、積分運算,進而產生相應的輸出。計算性能算的它幾乎都能算。

這樣,用PLC實現模擬量控制是完全可能的??刂频膯挝恢悼尚〉?12分之一的丈量程值,多數也是足夠的。

PLC進行模擬量控制,還有A/D、D/A組合在一起的單元,并可用PID或模糊控制算法實現控制,可得到很高的控制質量。

用PLC進行模擬量控制的好處是,在進行模擬量控制的同時,開關量也可控制。這個優點是別的控制器所不具備的,或控制的實現不如PLC方便。

當然,若純為模擬量的系統,用PLC可能在性能價格比上不如用調節器。這也是應當看到的。
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