DEIF RMC-111D数字电子设备

如其过程不是特别快,通常不必要求使用0采样周期来处理每次PID扫描的PID运算。如果很多PID回路都使用大于扫描时间的采样周期的话,则若许多回路可在同时结束处理运算时,可以设置较宽的PLC扫描时间变化范围。最简单的解决办法是通过一一个设置为0的位数组进行排列一个或多个位，使电流传至各单个PID模块。

确定过程特征

PID回路增益、kp.ki和kd可由所控制的过程特征确定。其中两个关键问题为:

1当我们通过固定敏改变CV时,PV改变有多大?开跻增益是什么?

2系统响应有多快,或者说CV输人跃迁(Stepped)后PV改变有多快?

许多过程可由过程增益.初级或次级顺序延迟及一个纯时间延迟而模拟。在频率范围内,含

一纯时间延迟的初级顺序延迟系统的转换功能如下:

PV(s)/CV(s)= G(s)=K#e# *(- Tps)/(1+ Tcs)

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