求翻译：论文以机床的数控化改造为背景，概述了机床数控改造的设计方案与应用技术进行探讨，并对PLC的发展与应用作了简要介绍。论文介绍了PLC编程特点和方式，介绍了PLC编程环境。介绍PLC的安装维要求及环境是什么意思？

Paper with machine tool numerical control transformation in the background, outlined the design of machine tool numerical control reconstruction programmes and to explore technology and brief on the development and application of PLC. Paper describes the characteristics and PLC programming, describes the PLC programming environment. Describes installation dimension requirement of PLC and environment