https://support.industry.siemens.com/cs/document/103526819/single-and-multi-loop-controller-structures-(cascade-control)-with-pid_temp?dti=0&lc=en-US    (P29)

原文：

The following procedure is generally suitable for commissioning:

1. Optimizing the controller “from inside out”.

2. Using the substitute setpoints for commissioning.

3. Tuning in two steps:

请问为什么要用替代的设定值进行调试？