PLC控制系統(tǒng)一般設(shè)計(jì)方法:
1、分析控制系統(tǒng)的控制要求
熟悉被控對(duì)象的工藝要求,確定必須完成的動(dòng)作及動(dòng)作完成的順序,歸納出順序功能圖。
2、選擇適當(dāng)類型的PLC
根據(jù)生產(chǎn)工藝要求,確定I/O點(diǎn)數(shù)和I/O點(diǎn)的類型(數(shù)字量、模擬量等),并列出I/O點(diǎn)清單。
進(jìn)行內(nèi)存容量的估計(jì),適當(dāng)留有余量。根據(jù)經(jīng)驗(yàn),對(duì)于一般開(kāi)關(guān)量控制系統(tǒng),用戶程序所需
存儲(chǔ)器的容量等于I/O總數(shù)乘以8;對(duì)于只有模擬量輸入的控制系統(tǒng),每路模擬量需要100個(gè)存
儲(chǔ)器字;對(duì)于既有模擬量輸入又有模擬量輸出的控制系統(tǒng),每路模擬量需要200個(gè)存儲(chǔ)器字。
確定機(jī)型時(shí),還要結(jié)合市場(chǎng)情況,考察PLC生產(chǎn)廠家的產(chǎn)品及其售后服務(wù)、技術(shù)支持、網(wǎng)絡(luò)通信
等綜合情況,選定性能價(jià)格比好一些的PLC機(jī)型。
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