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本文针对通用型可编程序控制器（ＰＬＣ）模拟量处理能力弱的缺点，设计了能够满足中小型水电站微机监控系统要求的可编程序控制器模拟量扩展模块。文中针对具体项目，详尽介绍了ＰＬＣ模拟量扩展的基本原理和实现方法。给出了硬、软件框图和主要试验数据。
In this paper, aiming at the weakness of the universal analog programmable controller (PLC), this paper designed a programmable controller analog expansion module which can meet the requirements of the computer monitoring system of small and medium hydropower stations. The article for a specific project, a detailed introduction to the PLC analog expansion of the basic principles and methods of implementation. Given the hardware and software block diagram and the main test data.