基于PLC的模拟量和高速计数器的教学实验板设计

Development of the analog conversion and high-speed counter experimental board for the PLC teaching

由于实验器材昂贵而造成部分中、高职院校教学器材短缺。本文介绍了一种基于PLC的模拟量及高速计数器的PLC教学实验板的开发方法,即采用串联电阻的分压原理,用一固定值电阻和可调电阻串联,两电阻接点处的电压为模拟量信号;利用集成芯片555定时器的特性,使之作为高速脉冲信号发生器。实验表明,该实验板能达到基于PLC模拟量及高速计数器的教学实验要求。利用该方法开发的教学实验器材,使用灵活,性能稳定,直观性强,制作容易且价格便宜。

Nowadays, some vocational colleges are shortage of teaching equipment because the high cost of experimental equipments being. This article presents the development of an Analog conversion and High-speed counter experimental board applied to teach PLC. The partial pressure principle of series resistance was applied to generate the analog signal. The 555 timer worked in asynchronous mode combined with AD/DA conversion module to perform High-speed counter signal generator. The results indicate that the developed analog conversion and High-speed experimental board was flexible and stable performance. This experimental board enables the students conveniently and reliably to acquire the analog conversion and High-speed counter knowledge through PLC experiment. It provided a feasible alternative to teach analog conversion and High-speed counter on PLC teaching.