基于PLC的冷库控制系统设计.docx

文档介绍：目录1绪论......................................................................................................................1...........................................................................................1......................................................................................3...............................................................................4.....................................................................................6...2冷库系统概述......................................................................................................7......................................................................................................7............................................................................................................7.............................................................................8...................................................................................................9..................................................................................9..................................................................................................1..........................................................................................1...................................................................................1......................................................................................1..........................................................................................1..、D/A转换器的选取.....................................................................1..........................................................................................1...........................................................................................1..-485总线................