I want to know the region of PID tuner

I designed a system like picture. In the picture, I set 2 PID tuner. The question is "what is control region of the first PID controller". Does the PID controller control whole block before the feedback point?

Answer 1

[Image Analyst]

Why would it? I don't see any signals going from the first PID controller block back to the "whole block before the feedback point" so how could it control it?

Answer 2

[Arkadiy Turevskiy]

The PID Tuner considers as the plant all blocks in the loop between the PID Controller block output and input.

See here for more details.