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輸入/輸出滯后時間又稱系統(tǒng)響應(yīng)時間,是指PLC部輸入信號發(fā)生變化的時刻至它控制的有關(guān)外部輸出信號發(fā)生變化的時刻之間的時間間隔,它由輸入電路濾波時間、輸出電路的滯后時間和因掃描工作方式產(chǎn)生的滯后時間這三部分組成。
輸入模塊的RC濾波電路用來濾除由輸入端引入的干擾噪聲,消除因外接輸入觸點動作時產(chǎn)生的抖動引起的不良影響,濾波電路的時間常數(shù)決定了輸入濾波時間的長短,其典型值為10ms左右。
輸出模塊的滯后時間與模塊的類型有關(guān),繼電器型輸出電路的滯后時間一般在10ms左右;雙向晶閘管型輸出電路在負(fù)載通電時的滯后時間約為1ms,負(fù)載由通電到斷電時的*大滯后時間為10ms;晶體管型輸出電路的滯后時間一般在1ms以下。
由掃描工作方式引起的滯后時間*長可達(dá)兩個多掃描周期。
PLC總的響應(yīng)延遲時間一般只有幾十ms,對于一般的系統(tǒng)是無關(guān)緊要的。要求輸入輸出信號之間的滯后時間盡量短的系統(tǒng),可以選用掃描速度快的PLC或采取其他措施。
整體式PLC又叫做單元式或箱體式PLC,CPU模塊、I/O模塊和電源裝在一個箱狀機殼內(nèi),結(jié)構(gòu)非常緊湊。它的體積小、價格低,小型PLC一般采用整體式結(jié)構(gòu)。圖1是三菱公司的FX1S系列PLC。
整體式PLC提供多種不同I/O點數(shù)的基本單元和擴展單元供用戶選用,基本單元內(nèi)有CPU模塊、I/O模塊和電源,擴展單元內(nèi)只有I/O模塊和電源,基本單元和擴展單元之間用扁平電纜連接。各單元的輸入點與輸出點的比例一般是固定的,有的PLC有全輸入型和全輸出型的擴展單元。選擇不同的基本單元和擴展單元,可以滿足用戶的不同要求。
圖1 整體式PLC
整體式PLC一般配備有許多專用的特殊功能單元,如模擬量I/O單元、位置控制單元和通信單元等,使PLC的功能得到擴展。
FX系列的基本單元、擴展單元和擴展模塊的高度和深度相同,但是寬度不同。它們不用基板,各模塊可用底部自帶的卡子卡在DIN導(dǎo)軌上,兩個相鄰的單元或模塊之間用扁平電纜連接,安裝好后組成一個整齊的長方體。
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