With a direct acting controller, an increasing input will cause a _____________ output.

In control systems, a direct acting controller is designed to respond to changes in input by adjusting the output in the same direction. Therefore, when the input to a direct acting controller increases, the output also increases. This relationship is fundamental to the operation of direct acting controllers, as they are typically used in processes where an increase in the process variable should lead to an increase in the control action to maintain the desired setpoint.

For instance, if the controller is regulating temperature and the input (temperature measurement) increases, the controller would increase the heating output to bring the temperature back down to the setpoint. This direct relationship ensures that the controller acts to stabilize the process effectively.

Understanding this principle is crucial for control system technicians, as it informs how they should set up and troubleshoot controllers in various applications.