可编程控制器（PLC）作为一种以微处理器及其存储器为控制中心的自动化装置，在工业自动化控制领域发挥着越来越重要的作用。
Programmable logic controller(PLC) is a kind of automation device with microprocessor and memorizer as its control center, which plays a more and more important role in the field of industry.
软件也是这样，为用户提供个性化装饰能力， 既有趣，又可以作为有用的导航助手。
The same is true of software, and giving users the ability to decorate their personal applications is both fun and useful as a navigational aide.
以PLC为核心的催化剂自动加料控制系统，可以提高催化裂化装置的自动控制水平。
The PLC is the core of the catalyst automatic feed control system. It can improve the FCCU automation control level.
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