In Example 11-2.2 the constraint control scheme shown in Fig. 11-2.4 was presented and discussed….

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In Example 11-2.2 the constraint control scheme shown in Fig. 11-2.4 was presented and discussed. In the discussion of the scheme, it was mentioned that “if at any time the operating personnel were to set the flow controller FClOl in the automatic or the manual mode (off cascade mode), then the safety provided by TClOl and PC103 would not be in effect. This would result in an unsafe and unacceptable operating condition.” Modify the control scheme shown such that even when FClOl is off cascade, controllers TClOl and PC103 still provide the necessary safety override.