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基于台达DVP-EH系列可编程逻辑控制器(PLC)中PWD输入脉宽检测指令和DCNT高速计数指令开发出PLC测频系统。PLC测频系统提供了3路测频通道,3路频率信号同时输入的情况下,采用不同处理方法输出正确的频率信号,再经过区间比较、计数延迟的方法判断出频率信号的状态,给出了综合判断后的机组频率。
Based on Delta DVP-EH series programmable logic controller (PLC) input pulse width detection instructions and DCNT high-speed counter instructions developed PLC frequency measurement system. PLC frequency measurement system provides three channels, three frequency signals simultaneously input case, the use of different methods of output the correct frequency signal, and then through the interval comparison, counting delay method to determine the frequency of the signal state, given After a comprehensive judge unit frequency.