DI模块测量脉冲信号的理论研究及其应用实例  

Fundamental Research of DI Module Survey Pulse Signal and Its Application

作　　者：李璐[1] 张晓燕[2] 

机构地区：[1]深圳市水务集团有限公司盐田污水处理厂,深圳518088 [2]深圳市水务集团有限公司滨河污水处理厂,深圳518088

出　　处：《自动化仪表》2007年第10期65-67,共3页Process Automation Instrumentation

摘　　要：在某些只有低频脉冲信号的场合,能否使用普通数字量输入模块来替代昂贵的专用计数器模块进行频率测量,通过分析数字量输入模块和PLC系统的工作原理,对普通DI模块测量脉冲信号的各种制约条件进行了理论研究,并计算出可测量脉冲信号的最大范围。在此基础上,以液体流量计为例,介绍了用普通DI模块实现流量累计计量的步骤和方法。实际效果表明,DI模块能较好地实现测量低频脉冲信号的目的。Abstract： In some occasions that only low frequency pulse signals needed to be measured, can we use the conventional DI module to replace the expensive and exclusive counter module to survey the frequency7 Through analyzing the operational principle of ordinary DI module and PLC system, the theoretical research on each kind of restrictive conditions in DI module to survey pulse signal is conducted, and the widest range of pulse signal that can be surveyed is calculated. On this basis, with the fluid flow meter as example, the procedures and method for measuring the flow of ordinary DI module are presented. The actual effect indicates that the DI module could completely realize the goal of surveying pulse signal.

关 键 词：DI模 块脉冲信号 响应时间 扫描周期 累计流量 

分 类 号：TP273.1[自动化与计算机技术—检测技术与自动化装置]