目录摘要··········································································································· 1 关键词········································································································ 1 Abstract ····································································································· 1 Key words ··································································································· 1 1绪论······································································································ 2 ·················································································· 2 ············································································ 2 ··············································································· 2 ··············································································· 3 2自动运料控制系统的分析··········································································· 3 ······································································ 3 ············································································ 3 ········································································ 3 ········································································ 3 、右行减速行程开关的意义······················································ 4 ············································································ 4 3 PLC 控制系统设计···················································································· 5 PLC 的概述························································································ 5 PLC 控制系统的特点········································································ 5 PLC 系统的构成·············································································· 5 PLC 的工作原理·····················································
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