详细说明了基于P LC控制的自动翻转夹具的原理、结构和使用方法，并结合实例给出了PLC的梯形图和液压原理图。
The article particularizes the theory, configuration and use ways of turnover drill press clamp under the control of PLC. And finally shows the trapezoid drawing of PLC and hydraulic pressure chart.
结合AOV图与因果图提出了一种新的梯形图与语句表双向转换算法。
Transformation algorithm between the ladder diagram and the statement list based on the AOV diagraph and the cause and effect diagraph for programmable logic controller(PLC) systems is proposed.
采用理论推导，结合数值模拟的方法，分析了梯形成形算法的基本结构、幅频特性以及弹道亏损。
The basic structure, amplitude frequency response characteristics and ballistic deficit effect of the algorithm were studied with both theoretical analysis and computer simulation methods.
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