廈門仲鑫達(dá)自動化設(shè)備有限公司
S7-300 PLC的選型原則是據(jù)生產(chǎn)工藝所需的功能和容量進(jìn)行選型,并考慮維護(hù)的方便性、備件的通用性,以及是否易于擴(kuò)展和有無特殊功能等要求。選型時具體注意以下幾方面:
(1)有關(guān)參數(shù)確定。一是輸入/輸出點數(shù)(I/O點數(shù))確定。這是確定PLC規(guī)模的一個重要依據(jù),一定要根據(jù)實際情況留出適當(dāng)余量和擴(kuò)展余地。二是PLC存儲容量確定。注意當(dāng)系統(tǒng)有模擬量信號存在或要進(jìn)行大量數(shù)據(jù)處理時,其存儲容量應(yīng)選大一些。
(2)系統(tǒng)軟硬件選擇。一是擴(kuò)展方式選擇,S7-300 PLC有多種擴(kuò)展方式,實際選用時,可通過控制系統(tǒng)接口模塊擴(kuò)展機(jī)架、Profibus-DP現(xiàn)場總線、通信模塊、運(yùn)程I/O及PLC子站等多種方式來擴(kuò)展PLC或預(yù)留擴(kuò)展口;二是PLC的聯(lián)網(wǎng),包括PLC與計算機(jī)聯(lián)網(wǎng)和PLC之間相互聯(lián)網(wǎng)兩種方式。因S7-300 PLC的工業(yè)通信網(wǎng)絡(luò)淡化了PLC與DCS的界限,聯(lián)網(wǎng)的解決方案很多,用戶可根據(jù)企業(yè)的要求選用;三是CPU的選擇,CPU的選型是合理配置系統(tǒng)資源的關(guān)鍵,選擇時必須根據(jù)控制系統(tǒng)對CPU的要求(包括系統(tǒng)集成功能、程序塊數(shù)量限制、各種位資源、MPI接口能力、是否有
PROFIBUS-DP主從接口、RAM容量、溫度范圍等),并最好在西門子公司的技術(shù)支持下進(jìn)行,以獲得合理的選型;四是編程軟件的選擇,這主要考慮對CPU的支持狀況,我們的體會是:STEP7 V4.0對有些型號的CPU不支持,硬件組態(tài)時會發(fā)生故障出錯,而STEP7V5.0則不存在這種問題。 Applied Materials/AMAT 0200-09478 Plate gas distr. uppe
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Applied Materials / AMAT 0020-20558 Plate
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