METHOD FOR RECORDING WORKING INFORMATION OF AUTOMATIC WORKING MACHINE

PURPOSE:To record the working state of an automatic working machine such as a numerical controller by connecting the preceding working information to one end of a list structure storing invalid data at the updating of the working information. CONSTITUTION:The numerical controller 1 controls a robot 5 based on signal inputs from an operation key 2 or a signal line 4. A computer in the numerical controller 1 consists of a processor 8, a main storage device 6 and an auxiliary storage device 7 and necessary programs or data are loaded from the device 7 to the device 6 and then used. If necessary, data can be written from the device 6 to the device 7 and the data in the device 7 are processed as the unit of a file. To update a working information file, a data block including old working information is added to the last line of a blank data block list. On other hand, the blank data block list is used to record new working information from the leading line of the blank data block list.