FANUC I/O Link axis function was used to control the flying saucer type magazine of the drill tapping center. PMC window was used to read the position of Z axis, and it was compared with the relevant reference point to determine whether tools could be changed on current position, in order to achieve safe and accurate tool change. It is indicated that using the I/O Link axis control servo motors can greatly improve the efficiency and ATC reliability. At the same time the accuracy of the tool change magazine is improved.