描述
PLC的推广应用在我国得到了迅猛的发展，它已经大量地应用在各种机械设备和生产过程的电气控制装置中，各行各业也涌现出了大批应用PLC改造设备的成果。了解PLC的工作原理，具备设计、调试和维护PLC控制系统的能力，已经成为现代工业对电气技术人员和工科学生的基本要求。
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