Based on the background of a newly-built small-scale aluminium smelting enterprise, the thesis designs a purification control system of exhausted gas with S7-300 PLC.
本文以新建的某小型铝冶炼企业为研究背景，设计了以S7- 300系列PLC为控制器的烟气净化控制系统。
For the library in small scale, the PLC based intelligent lightening can be applied to automatically control light, and relatively speaking, it saves the investment in short term.
对于一般小规模的图书馆，可以简单的应用PLC实现照明自动控制，但是该技术相对来说节省短期投资。
While most of the SOE system is established in large-scale DCS or the monitor system composed by PLC. As for small-scale heat-engine plant, low-cost SOE system is lacking.
而SOE系统大都建立在大型DCS分布式测控系统或由PLC组成的测控系统中，对于小型电厂而言，缺少低成本的SOE系统。
While most of the SOE system is established in large-scale DCS or the monitor system composed by PLC. As for small-scale heat-engine plant, low-cost SOE system is lacking.
而SOE系统大都建立在大型DCS分布式测控系统或由PLC组成的测控系统中，对于小型电厂而言，缺少低成本的SOE系统。
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