ABB DDI01
連接或者未連接遠(yuǎn)程模塊的基本單元的重要時(shí)間如下:
反應(yīng)時(shí)間是從輸入端子到輸出端子信號(hào)的傳輸時(shí)間。對(duì)于數(shù)字信號(hào),反應(yīng)時(shí)間是由時(shí)間延遲組成的,程序執(zhí)行周期時(shí)間和當(dāng)由遠(yuǎn)程模塊的情況下, 還要考慮總線傳輸時(shí)間。
周期時(shí)間決定了時(shí)間間隔，間隔后,處理器重新執(zhí)行用戶程序。周期時(shí)間必須由用戶定義。它應(yīng)該比用戶程序執(zhí)行實(shí)際時(shí)間加上時(shí)間傳輸時(shí)間和相應(yīng)的等待時(shí)間要長(zhǎng)。對(duì)于某些時(shí)間控制的函數(shù)如INTK來說，周期時(shí)間也是基于時(shí)間的。
程序處理時(shí)間是處理用戶程序的凈時(shí)間
設(shè)定周期時(shí)間
假設(shè),在最壞的情況下,處理器仍可以得到訪問。
周期時(shí)間存儲(chǔ)在任務(wù)組態(tài)且可以選擇的間隔步為1ms.如果選擇的周期時(shí)間過短,處理器將無法將賦予它的任務(wù)處理完成。這樣的結(jié)果時(shí)時(shí)間延遲。
如果經(jīng)過某些周期后,缺時(shí)過大的化,處理器將中斷程序執(zhí)行輸出錯(cuò)誤(FK2)對(duì)于一些功能塊,如PID控制器,無錯(cuò)誤執(zhí)行依賴與精確的時(shí)間順序。一定要確認(rèn)為PID保留了許多時(shí)間。
采用下列的步驟，可以檢查正確的周期時(shí)間:
●將用戶程序裝入基本單元。
●用"Online/PLC Browser/cpuload"，查詢系統(tǒng)應(yīng)用的能力。
●改變運(yùn)行周期時(shí)間直到負(fù)載能力小于80%。
當(dāng)設(shè)定周期時(shí)間時(shí)，考慮下列值:
從I/O驅(qū)動(dòng)到I/O映象讀取和拷貝信號(hào)的時(shí)間。
●從I/O映象到I/O映象存儲(chǔ)區(qū)讀取和拷貝用戶任務(wù)輸入信號(hào)的時(shí)間。
●程序處理時(shí)間
●從I/O映象存儲(chǔ)區(qū)到I/O映象拷貝用戶任務(wù)輸出信號(hào)的時(shí)間。
●從I/O映象到I/O驅(qū)動(dòng)及設(shè)定I/O到I/O模塊拷貝輸入信號(hào)的時(shí)間。
●在周期時(shí)間內(nèi)從通訊卡報(bào)文接收/發(fā)送中斷
●在周期時(shí)間內(nèi)從串口接收/發(fā)送中斷
●改變?nèi)蝿?wù)
●看門狗運(yùn)行時(shí)間
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