Patent ID: 6477441
Filing Date: 2002-11-05
Classification: G05B,G06F

Abstract:
A numerical control system having a numerical control (NC) system section and a personal computer (PC) section, said numerical control system comprising:an interrupt generation circuit provided in the numerical control system section for generating an interrupt in the NC system section when a power off switch is pressed; PC termination acknowledgement means provided in the numerical control system section for sending a termination request to the personal computer section when the interrupt is generated by said interrupt generation circuit, acknowledging a PC termination notification from the personal computer section, and requesting a signal output circuit to turn on a signal previously assigned to power off a power unit; a PC power down handling section provided in the personal computer section for forcibly terminating an application program and an operating system in the personal computer section after receiving the termination request sent from said PC termination acknowledgement means in the numerical control system section; PC power down handling start wait means provided in the personal computer section for waiting for at least a power supply voltage holding time after the power of the power unit is turned off at the beginning of PC power down handling for preventing said operating system from advancing to the next process, and a BIOS section provided in the personal computer section for checking that the operating system is terminated and sending the PC termination notification to the numerical control system section, wherein the power unit turns off power as the signal assigned to power off is turned on by the signal output circuit.