On a direct acting positioner, if the output from the controller decreases, the positioner's output will:

In a direct acting positioner, the logic of operation is such that it directly correlates the controller's output with the actuator's position. When the output signal from the controller decreases, the positioner responds by decreasing its own output. This is because the direct acting positioner functions to control the actuator in a manner that maintains the desired position of the valve or other element being controlled.

As the controller's signal diminishes, the positioner's role is to adjust accordingly, resulting in a reduced output that leads to the actuator moving toward a position that reflects this lower signal. This relationship is essential for maintaining accurate control in various industrial processes, allowing the system to react to changes effectively and maintain desired operational parameters.

In this context, some options do not align with the fundamental working principle of a direct acting positioner, where a decrease in input yield a corresponding decrease in output, ensuring the control system adapts in response to the changes in demand from the controller.