Abstract: A numerical machine tool control has several processors. A monitoring circuit is associated with each processor which, upon the appearance of a predetermined address, interrupts the address stepping action in all processors by an interrupt command with highest priority and switches to the servicing mode. The stored data assigned to the respective addresses and the states of the overall system can be interrogated successively from the operating panel and changed, if necessary.

Abstract: In numerical controls of machine tools, the downwards (lengthwise) sum of the programmed information of each system program memory (SP1) is stored in an additional memory. For later checking of the memory contents, the downwards sums of the respective memories on the control side are formed and are compared with the stored information. If a sum deviates, a trouble signal is given out as an indication of the defective memory.

Abstract: In path control apparatus for a numerically controlled machine tool, a computer determines the trajectory to be traversed in space, resolves the latter by way of interpolation into the axial increments of the individual feed axes and performs complete position control for each axis. The interpolation is accomplished by the method of direct function computation, using travel distance increments proportional to the trajectory velocity. The position control is designed as a discrete control and operates with the premise that the minimum total computing cycle time is shorter than the sampling time of the fastest position control loop required by the control system.