| 摘要 |
PCT No. PCT/JP81/00157 Sec. 371 Date Mar. 5, 1982 Sec. 102(e) Date Mar. 5, 1982 PCT Filed Jul. 7, 1981 PCT Pub. No. WO82/00210 PCT Pub. Date Jan. 21, 1982.The present invention relates to a novel numerical control device which enables failures to be diagnosed even when a failure develops in a main processor for executing numerical control as well as failure diagnosis in hardware and the like. The invention includes a bus switching circuit provided in a main bus of an NC device. The NC device also includes a main processor for carrying out numerical control, a main memory, a tape reader, a numerical control panel and position control circuits. Further provided are a service processor for carrying out failure diagnosis and a service memory. When a failure develops in the main processor, the service processor immediately halts the execution of instructions by the main processor, the service processor is then connected to the main bus by the switching action of the bus switching circuit, and the service processor executes failure diagnosis by means of a diagnostic program for diagnosing failures, which program has been previously written into the service memory. |
