一阶低通滤波器更多内容请参考信号处理专栏相关文章，常用链接如下：

1、SMART PLC 低通滤波器和模拟量采集应用

https://rxxw-control.blog.csdn.net/article/details/136595982https://rxxw-control.blog.csdn.net/article/details/1365959822、SMART PLC双线性变换和后向差分对比测试

https://rxxw-control.blog.csdn.net/article/details/136551330<