plc控制系統的可靠性分析及其關鍵技術研究畢業論文(已修改)

　

【正文】 ┊┊┊┊┊┊┊┊┊┊┊┊┊裝┊┊┊┊┊訂┊┊┊┊┊線┊┊┊┊┊┊┊┊┊┊┊┊┊PLC控制系統的可靠性分析及其關鍵技術研究畢業論文目 錄1 緒 論 .....................................................................................................................................................1 研究課題的來源 .......................................................................................................................1 國內外先進水平 .........................................................................................................................1 本課題所做工作 .........................................................................................................................2 本課的應達目的 .................................................2 本課題的內容和要求 .............................................22 可編程控制器 .................................................................................................................................3 概述 ..................................................................................................................................................3 可編程控制器的產生和功能特點 ..................................................................................3 可編程控制器的應用 ..........................................................................................................4 可編程控制器的基本結構 ................................................................................................4 可編程控制器的工作原理 ................................................................................................5 PLC 控制的特點 ......................................................................................................................5 PLC 與繼電器控制系統比較 .............................................................................................5 PLC 與微型計算機的比較 ....................................................................................................63 PLC控制系統可靠性分析 .................................................................................................8 干擾來源的分析 ......................................................................................................................8 增強 PLC 可靠性的方案 ......................................................................................................9 1 電源的抗干擾措施 ..................................................................................................................9 安裝與布線的方案 .................................................................................................................9 輸入、輸出端的抗干擾措施 ....................................................................10 電源和感性負載的處理 .....................................................................................................10 接地和接線的抗干擾措施 ................................................................................................10 軟件抗干擾措施 ...................................................................................................................11 電磁干擾的抗干擾措施 ....................................................................................................124 PLC 系統冗余技術 ..............................................................................................................13 冗余技術的配置 ....................................................................................................................14┊┊┊┊┊┊┊┊┊┊┊┊┊裝┊┊┊┊┊訂┊┊┊┊┊線┊┊┊┊┊┊┊┊┊┊┊┊┊ 冗余技術的具體分類 .........................................................................................................13 冗余設計在 PLC 控制系統中的應用 .......................................................................14 處理器冗余 ............................................................................................................................14 通信冗余 .................................................................................................................................14 I/O 冗余 ..................................................................................................................................15 電源冗余 .................................................................................................................................15 改進的冗余設計方案 .........................................................................................................15致謝 .........................................................................................................................................................17