Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1998-11-10
2000-11-14
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318 16, 318625, 318480, G05B 19414, H04B 1024
Patent
active
06147469&
DESCRIPTION:
BRIEF SUMMARY
This application is a National Stage of International Application PCT/JP98/00983 under 35 USC .sctn.371, filed Mar. 10, 1998.
TECHNICAL FIELD
The present invention relates to an improvement of a communication method in a controller of a machine.
BACKGROUND ART
A telecommunication cable or an optical cable has been used in communication between a numerical control device or the like as a main control unit and an interface device, and between a numerical control device or the like and a servo amplifier or the like as a drive control unit. In using either cable, a lead-around work of cables is troublesome and may cause disconnection thereof, and in particular the telecommunication cable may pick up an external electrical noise which may cause an abnormality in communication data.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a communication method for a controller of a machine which is not affected by disconnection of cables and electrical external noises nor requires any complicated lead-around work of cables.
According to an aspect of the present invention, a communication method in a controller of a machine includes steps of: providing infrared communication interfaces on a main control unit and a drive control unit; and performing infrared communication between the main control unit and the drive control unit through the infrared communication interfaces.
Further, an infrared communication interface may be provided on an interface device for connecting the main control unit and a peripheral device, to thereby perform infrared communication between the main control unit and the interface device.
According to another aspect the invention, a communication method in a controller of a machine includes the steps of: providing infrared communication interfaces on a main control unit and a plurality of drive control units; and performing infrared communication between the main control unit and the plurality of drive control units through the infrared communication interfaces. In this case, the plurality of drive control units are connected to each other in series so that the infrared communication can be performed in a daisy chain between the main control unit and the plurality of drive control units.
The machine controlled by the control device includes a machine tool, a robot, an injection molding machine and a press machine.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is an illustration showing an arrangement in which an communication method of the present invention is applied to communication between a numerical control device as a main control unit and servo amplifiers as drive control units for driving motors based on a command from the numerical control device;
FIG. 2 is a functional block diagram showing infrared communication between the numerical control device and the servo amplifiers for respective axes based on the arrangement shown in FIG. 1;
FIG. 3 is a timing chart showing a state of infrared communication between the numerical control device and the servo amplifiers for respective axes in time series based on the arrangement shown in FIG. 1;
FIG. 4 is a schematic block diagram showing an embodiment in which a communication method of present invention is applied to a machine tool such as a milling machine;
FIG. 5 is a schematic block diagram showing an embodiment in which a communication method of a present invention is applied to an articulated industrial robot;
FIG. 6 is a schematic block diagram showing an embodiment in which the communication method of the invention is applied to an injection molding machine;
FIG. 7 is a schematic block diagram showing an embodiment in which the communication method of the invention is applied to a press machine; and
FIG. 8 is a schematic block diagram showing an embodiment in which a communication method of the present invention is applied to a machine tool such as a milling machine.
BEST MODE OF CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of a communication method of the present invention being applied to comm
REFERENCES:
patent: 4792995 (1988-12-01), Harding
patent: 4819273 (1989-04-01), Gordon
patent: 5819008 (1998-10-01), Asama et al.
Matsubara Shunsuke
Uchida Hiroyuki
Yamada Yuuichi
Fanuc Ltd.
Ro Bentsu
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