How does override (selector) control work and when is it used?

Override control uses high or low selectors to choose between multiple controller outputs, allowing one control objective to take priority over another under certain conditions. Example: compressor control where normal flow control is overridden by low suction pressure protection - selector chooses minimum output. Override configurations: high selector for protective limits on maximum, low selector for protective limits on minimum. Anti-windup (external reset) must be configured for the controller not selected to prevent windup.