But now, PLC mostly still take on the most essential control, such as sequential control and PID feedback control.

然而，PLC还大都只是承担最基本的控制功能，如顺序控制和PID反馈控制。

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The use of sequential rely feedback tests for system try to obtain a more accuracy process model, to design PID controller method based on the internal model control principle is presented.

提出采用连续继电反馈实验辨识高精度的过程模型，基于内模原理设计PID控制器的方法。

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