1SAR330020R0000 可控硅觸發(fā)板
1SAR330020R0000 可控硅觸發(fā)板
直流輸入接口電路
濾波電路用以消除輸入觸頭的抖動,光電耦合電路可防止現(xiàn)場的強(qiáng)電干擾進(jìn)入PLC。由于輸入電信號與PLC內(nèi)部電路之間采用光信號耦合,所以兩者在電氣上完全隔離,使輸入接口具有抗干擾能力。現(xiàn)場的輸入信號通過光電耦合后轉(zhuǎn)換為5V的TTL送入輸入數(shù)據(jù)寄存器,再經(jīng)數(shù)據(jù)總線傳送給CPU。
2)輸出接口
輸出接口電路向被控對象的各種執(zhí)行元件輸出控制信號。常用執(zhí)行元件有接觸器、電磁閥、調(diào)節(jié)閥(模擬量)、調(diào)速裝置(模擬量)、指示燈、數(shù)字顯示裝置和報(bào)警裝置等。輸出接口電路一般由微電腦輸出接口電路和功率放大電路組成,與輸入接口電路類似,內(nèi)部電路與輸出接口電路之間采用光電耦合器進(jìn)行抗干擾電隔離。
微電腦輸出接口電路一般由輸出數(shù)據(jù)寄存器、選通電路和中斷請求邏輯電路集成在芯片上,CPU通過數(shù)據(jù)總線將輸出信號送到輸出數(shù)據(jù)寄存器中,功率放大電路是為了適應(yīng)工業(yè)控制要求,將微電腦的輸出信號放大。
3)其它接口
若主機(jī)單元的I/O數(shù)量不夠用,可通過I/O擴(kuò)展接口電纜與I/O擴(kuò)展單元(不帶CPU)相接進(jìn)行擴(kuò)充。 PLC還常配置連接各種外圍設(shè)備的接口,可通過電纜實(shí)現(xiàn)串行通信、EPROM寫入等功能。
4. 編程器
編程器作用是將用戶編寫的程序下載至PLC的用戶程序存儲器,并利用編程器檢查、修改和調(diào)試用戶程序,監(jiān)視用戶程序的執(zhí)行過程,顯示PLC狀態(tài)、內(nèi)部器件及系統(tǒng)的參數(shù)等。
編程器有簡易編程器和圖形編程器兩種。簡易編程器體積小,攜帶方便,但只能用語句形式進(jìn)行聯(lián)機(jī)編程,適合小型PLC的編程及現(xiàn)場調(diào)試。圖形編程器既可用語句形式編程,又可用梯形圖編程,同時(shí)還能進(jìn)行脫機(jī)編程。
目前PLC制造廠家大都開發(fā)了計(jì)算機(jī)輔助PLC編程支持軟件,當(dāng)個(gè)人計(jì)算機(jī)安裝了PLC編程支持軟件后,可用作圖形編程器,進(jìn)行用戶程序的編輯、修改,并通過個(gè)人計(jì)算機(jī)和PLC之間的通信接口實(shí)現(xiàn)用戶程序的雙向傳送、監(jiān)控PLC運(yùn)行狀態(tài)等。
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