PLC控制系統(tǒng)程序的調(diào)試 PLC控制系統(tǒng)程序的調(diào)試一般包括I/O端子測(cè)試和系統(tǒng)調(diào)試兩部分內(nèi)容，良好的調(diào)試步驟有利于加速總裝調(diào)試的過(guò)程。 4.1 I/O端子測(cè)試 用手動(dòng)開關(guān)暫時(shí)代替現(xiàn)場(chǎng)輸入信號(hào)，以手動(dòng)方式逐一對(duì)PLC輸入端子進(jìn)行檢查、驗(yàn)證，PLC輸入端子的指示燈點(diǎn)亮，表示正常;反之，應(yīng)檢查接線或者是I/O點(diǎn)壞。 我們可以編寫一個(gè)小程序，在輸出電源良好的情況下，檢查所有PLC輸出端子指示燈是否全亮。PLC輸入端子的指示燈點(diǎn)亮，表示正常。反之，應(yīng)檢查接線或者是I/O點(diǎn)壞。 4.2 系統(tǒng)調(diào)試 系統(tǒng)調(diào)試應(yīng)首先按控制要求將電源、外部電路與輸入輸出端子連接好，然后裝載程序于PLC中，運(yùn)行PLC進(jìn)行調(diào)試。將PLC與現(xiàn)場(chǎng)設(shè)備連接。在正式調(diào)試前全面檢查整個(gè)PLC控制系統(tǒng)，包括電源、接地線、設(shè)備連接線、I/O連線等。在保證整個(gè)硬件連接正確無(wú)誤的情況下即可送電。 把PLC控制單元的工作方式設(shè)置為“RUN”開始運(yùn)行。反復(fù)調(diào)試消除可能出現(xiàn)的各種問(wèn)題。在調(diào)試過(guò)程中也可以根據(jù)實(shí)際需求對(duì)硬件作適當(dāng)修改以配合軟件的調(diào)試。應(yīng)保持足夠長(zhǎng)的運(yùn)行時(shí)間使問(wèn)題充分暴露并加以糾正。調(diào)試中多數(shù)是控制程序問(wèn)題。一般分以下幾步進(jìn)行: （1） 對(duì)每一個(gè)現(xiàn)場(chǎng)信號(hào)和控制量做單獨(dú)測(cè)試; （2） 檢查硬件/修改程序; （3） 對(duì)現(xiàn)場(chǎng)信號(hào)和控制量做綜合測(cè)試; （4） 帶設(shè)備調(diào)試; （5） 調(diào)試結(jié)束。
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