Device for preventing reversing of self-tuning stroke of intelligent positioner and use method

The invention relates to the technical field of automatic instrument measurement, in particular to a device for preventing the reverse direction of the self-tuning stroke of an intelligent positioner and a using method of the device. A valve positioner, a limiting switch I and a limiting switch II are connected to a valve body of an air cylinder type or pneumatic thin film adjusting valve, and the limiting switch I is electrically connected with a limiting switch node signal I; the limiting switch II is electrically connected with a limiting switch node signal II; the positioner is electrically connected to the DO template in a given mode, the positioner is electrically connected to the AI template in a feedback mode, and a limiting switch node signal I and a limiting switch node signal II are electrically connected to the DO template. According to the invention, full-opening and full-closing positions are identified and positioned by a digital quantity input template, the full-opening and full-closing positi