| 摘要 |
PCT No. PCT/JP90/00931 Sec. 371 Date Mar. 18, 1991 Sec. 102(e) Date Mar. 18, 1991 PCT Filed Jul. 19, 1990 PCT Pub. No. WO91/01197 PCT Pub. Date Feb. 7, 1991.A method of displaying an operation history of a machine, which permits quick and proper investigation of the causes of troubles and trouble-shooting therefor. A processor of a numerical control device mounted on the machine writes a block number in a corresponding address region of a memory every time one block of a machining program is read out, and executes the block after an index indicating the address region to be stored with the next block number is determined (S1 to S4, S6). If the determined index exceeds a value indicating the last address region, the index is reset to a value indicating the first address region (S5). During the execution of each block, the processor successively determines, with respect to all the circuit sections of an input/output circuit, the presence/absence of signal transfer through each circuit section (S12), and causes a memory address region corresponding to the block to successively store codes individually indicating those circuit sections concerned in the signal transfer (S13), so that block numbers indicating up-to-date blocks and codes indicating the circuit sections concerned in the signal transfer during the execution of the blocks are continually held in their associated memory address regions, whereby the operation history of the machine is recorded. In response to a display command, the block numbers and codes constituting the operation history are successively displayed on a display screen according to precedence (S21 to S26).
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