基于DDS技术的PLC可变频脉冲输出控制器设计  

Design of PLC Variable Frequency Pulse Output Controller Based on DDS

作　　者：李广勇 LI Guang-yong(Nanda Auto Technology Co.,Ltd.,Nanjing 210012 China)

机构地区：[1]南大傲拓科技股份有限公司,江苏南京210012

出　　处：《自动化技术与应用》2021年第7期70-71,120,共3页Techniques of Automation and Applications

摘　　要：利用DDS技术设计一种基于CPLD器件,满足PLC可变频率脉冲输出要求的控制器。介绍了该控制器的工作原理、设计思路及实现方法。在CPLD器件上通过设置DDS频率合成的频率控制字,从而改变脉冲输出的频率变化。实验结果表明该设计脉冲输出频率准确性优于直接采用MCU定时器分频所得。A controller based on CPLD is designed by DDS technology,which can meet the requirement of PLC variable frequency pulse output.The working principle design idea and realization method of the controller are introduced.The frequency control word of DDS frequency synthesis is set on CPLD device to change the frequency change of pulse output.The experimental results show that the accuracy of the designed pulse output frequency is better than that of the MCU timer.

关 键 词：CPLD DDS PLC 频率控制字 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]