For the in-line blending system of Example 18.9, draw block diagrams for two multiloop control schemes: (a)

Question:

For the in-line blending system of Example 18.9, draw block diagrams for two multiloop control schemes:
(a) The standard scheme for x 0.4.
(b) The less interacting scheme where u1 WA + wB and U2 = WA.
You may assume that each transmitter and control valve can be represented by a first-order transfer function and that PI controllers are utilized.