描述
AB 1785-L60B
PLC的對外功能,主要是通過各種I/O接口模塊與外界聯(lián)系的,按I/O點數(shù)確定模塊規(guī)格及數(shù)量,I/O模塊可多可少,但其最大數(shù)受CPU所能管理的基本配置的能力,即受最大的底板或機架槽數(shù)限制。I/O模塊集成了PLC的I/O電路,其輸入暫存器反映輸入信號狀態(tài),輸出點反映輸出鎖存器狀態(tài)。
三、電源模塊:
有些PLC中的電源,是與CPU模塊合二為一的,有些是分開的,其主要用途是為PLC各模塊的集成電路提供工作電源。同時,有的還為輸入電路提供24V的工作電源。電源以其輸入類型有:交流電源,加的為交流220VAC或110VAC,直流電源,加的為直流電壓,常用的為24V。
四、底板或機架:
大多數(shù)模塊式PLC使用底板或機架,其作用是:電氣上,實現(xiàn)各模塊間的聯(lián)系,使CPU能訪問底板上的所有模塊,機械上,實現(xiàn)各模塊間的連接,使各模塊構(gòu)成一個整體。
五、PLC 的外部設(shè)備
外部設(shè)備是PLC系統(tǒng)不可分割的一部分,它有四大類
1. 編程設(shè)備:有簡易編程器和智能圖形編程器,用于編程、對系統(tǒng)作一些設(shè)定、監(jiān)控PLC及PLC所控制的系統(tǒng)的工作狀況。編程器是PLC開發(fā)應(yīng)用、監(jiān)測運行、檢查維護不可缺少的器件,但它不直接參與現(xiàn)場控制運行。
2. 監(jiān)控設(shè)備:有數(shù)據(jù)監(jiān)視器和圖形監(jiān)視器。直接監(jiān)視數(shù)據(jù)或通過畫面監(jiān)視數(shù)據(jù)。
3. 存儲設(shè)備:有存儲卡、存儲磁帶、軟磁盤或只讀存儲器,用于永久性地存儲用戶數(shù)據(jù),使用戶程序不丟失,如EPROM、EEPROM寫入器等。
4. 輸入輸出設(shè)備:用于接收信號或輸出信號,一般有條碼讀人器,輸入模擬量的電位器,打印機等。
六、PLC的通信聯(lián)網(wǎng)
PLC具有通信聯(lián)網(wǎng)的功能,它使PLC與PLC 之間、PLC與上位計算機以及其他智能設(shè)備之間能夠交換信息,形成一個統(tǒng)一的整體,實現(xiàn)分散集中控制。現(xiàn)在幾乎所有的PLC新產(chǎn)品都有通信聯(lián)網(wǎng)功能,它和計算機一樣具有RS-232接口,通過雙絞線、同軸電纜或光纜,可以在幾公里甚至幾十公里的范圍內(nèi)交換信息。
當(dāng)然,PLC之間的通訊網(wǎng)絡(luò)是各廠家專用的,PLC與計算機之間的通訊,一些生產(chǎn)廠家采用工業(yè)標(biāo)準(zhǔn)總線,并向標(biāo)準(zhǔn)通訊協(xié)議靠攏,這將使不同機型的PLC之間、PLC與計算機之間可以方便地進行通訊與聯(lián)網(wǎng)。
了解了PLC的基本結(jié)構(gòu),我們在購買程控器時就有了一個基本配置的概念,做到既經(jīng)濟又合理,盡可能發(fā)揮PLC所提供的最佳功能。
產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準(zhǔn)時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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