In the context of control circuits, what does 'manual control' require?

Manual control in control circuits specifically requires manual operation by an operator. This means that the process or system is governed by a person who directly interacts with the control devices to initiate and adjust operations as needed. In manual control systems, the operator takes an active role in decision-making and executing commands, often through physical manipulations of switches, buttons, or levers.

In contrast, a fully automated system implies that no manual input is necessary, allowing tasks to be completed without human intervention. The absence of pilot devices would indicate a lack of elements that facilitate operator input, which is contrary to the idea of manual control. Extended feedback loops pertain to more complex systems requiring monitoring and adjustments based on performance data, typically found in automated or semi-automated environments rather than purely manual systems.