US 5,850,338 AGranted

Numerical control system using a personal computer and a method of controlling the same

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorMitsushiro Fujishima

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Abstract

A PLL circuit 31 of a pulse convert/output circuit 12 in an NC board A 1 receives a fundamental clock signal CLK through a PC extension bus 207 from a fundamental clock generating circuit 201, and generates a sync pulse signal PLS on the basis of the received fundamental clock signal CLK. The sync pulse signal PLS is inputted to a gate 34. A signal select circuit 33 receives an address signal AD, or a RESET signal or an IRQ signal through the PC extension bus 207, and generates a pulse-outputting permission signal N3 on the basis of the received signal. The pulse-outputting permission signal N3 controls a gate 34 which determines the timing of starting the outputting of the sync pulse signal PLS. Consequently, a sync signal PLSOUT that is synchronized with those in the remaining NC boards is generated.

Claims18

Dependent claims

A numerical control system, comprising:

a personal computer including a clock signal generating means and a personal computer (PC) extension bus for input/output extension, and a plural number of NC boards connected to the PC extension bus, each NC board controlling one of a servo amplifier system and a remote I/O unit system, wherein the personal computer or one of the plural number of NC boards is used as a master device and the remaining NC boards are used as slave devices;
each of the slave devices comprises:
sync signal generating means for receiving a clock pulse signal from the clock signal generating means through the PC extension bus;
sync signal gate means for controlling the timing of the starting of an outputting operation of a sync signal received from the sync signal generating means;
pulse-outputting permission signal generating means for receiving a first control signal from the personal computer through the PC extension bus, the pulse-outputting permission signal generating means generating a pulse output permission signal to permit the output of said sync signal on the basis of a second control signal which is received from the master device through the PC extension bus, and the sync signal gate means starts the outputting of the sync signal received from the sync signal generating means, in response to the second control signal from the master device being received simultaneously with the first control signal from the personal computer, whereby the plurality of slave devices are synchronized with one another in their operation.

2 more elements

A method of controlling a numerical control system using a personal computer including a clock signal generating means and a personal computer (PC) extension bus for input/output extension, and a plural number of NC boards connected to the PC extension bus, each NC board controlling one of a servo amplifier system or a remote I/O unit system, wherein the method comprises:

setting one of the plural number of NC boards or the personal computer to be used as a master device;
setting the remaining of the plural number of NC boards to be used as slave devices;
generating a sync signal within each of said slave devices based upon a clock signal received from the clock signal generating means through the PC extension bus;
and
synchronizing the sync signals of the slave devices on the basis of control signals simultaneously received through the PC extension bus from the master device, whereby the plurality of slave devices are synchronized with one another in their operation.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/739,749Filed 29 Oct 1996
Priority: JP 7-2897478 Nov 1995
Granted: 15 Dec 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G05B 19/4145
Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller:…
G06F 1/04
Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00: generating or distributing clock signals or signals derived directly therefrom
G06F 11/327
Display of status information: alarm or error message display
G05B 2219/33094
Director till display: send clock from pc board, via extension bus to PLL circuit on nc boards, to servo