產(chǎn)品詳情
PLC的對(duì)外功能,主要是通過(guò)各種I/O接口模塊與外界聯(lián)系的,按I/O點(diǎn)數(shù)確定模塊規(guī)格及數(shù)量,I/O模塊可多可少,但其大數(shù)受所能管理的基本配置的能力,即受大的底板或機(jī)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(hào)狀態(tài),輸出點(diǎn)反映輸出鎖存器狀態(tài)。
三、電源模塊:
有些PLC中的電源,是與模塊合二為一的,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(shí),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(jī)架:
大多數(shù)模塊式PLC使用底板或機(jī)架,其作用是:電氣上,實(shí)現(xiàn)各模塊間的聯(lián)系,使能訪問(wèn)底板上的所有模塊,機(jī)械上,實(shí)現(xiàn)各模塊間的連接,使各模塊構(gòu)成一個(gè)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(jiǎn)易編程器和智能圖形編程器,用于編程、對(duì)系統(tǒng)作一些設(shè)定、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(cè)運(yùn)行、檢查維護(hù)不可缺少的器件,但它不直接參與現(xiàn)場(chǎng)控制運(yùn)行。
2.設(shè)備:有數(shù)據(jù)和圖形。直接監(jiān)視數(shù)據(jù)或通過(guò)畫面監(jiān)視數(shù)據(jù)。
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