描述
4.1I/O端子測(cè)試
用手動(dòng)開(kāi)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(xiàn)或者是I/O點(diǎn)壞。
我們可以編寫(xiě)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(xiàn)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(xiàn)、設(shè)備連接線(xiàn)、I/O連線(xiàn)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(kāi)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。
5結(jié)束語(yǔ)
PLC控制系統(tǒng)的設(shè)計(jì)是一個(gè)步驟有序的系統(tǒng)工程，要想做到熟練自如，需要反復(fù)設(shè)計(jì)和實(shí)踐。本文是PLC控制系統(tǒng)的設(shè)計(jì)和實(shí)踐經(jīng)驗(yàn)的總結(jié)，在實(shí)際應(yīng)用中具有良好的效果。
歐美品牌停產(chǎn)的，常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域：
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線(xiàn),變電站綜合自動(dòng)化控制系列
本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。
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