Method of detecting disconnection and power discontinuity of I/O unit connected to numerical controller
AssigneeFanuc Corporation
InventorsKouji Hada, Yuji Sone
Life of this patent
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Abstract
A power discontinuity occurring in any one of a plurality of I/O units connected to a numerical controller is detected. When the power discontinuity occurs in any one of the I/O units, the I/O unit detects the power discontinuity, and transmits the detection of the power discontinuity to an I/O unit in front of the I/O unit, at a timing different from a timing of an ordinary communication, in the form of a communication packet having a data pattern different from an ordinary data pattern. When the front I/O unit receives the communication packet, the communication packet is stored in a memory as power discontinuity detection information.
Claims6
A power discontinuity detection method for detecting a power discontinuity occurring in any one of a plurality of I/O units connected serially to one another via communication lines in a master-slave fashion, respectively, to a numerical controller, so as to communicate data between I/O units and the numerical controller the method comprising steps of:
- detecting the power discontinuity when the power discontinuity occurs in any one of the I/O units;
- transmitting the detection of the power discontinuity to a front I/O unit situated immediately before a rear I/O unit which is said I/O unit where the power discontinuity occurs, at a timing different from a timing of normal data communication, in the form of a communication packet having a data pattern different from a data pattern utilized during said normal data communication;
- and
- storing the communication packet, when the front I/O unit receives that communication packet, as a power discontinuity detection information.
A numerical control system for detecting a power discontinuity occurring in one of a plurality of I/O units connected serially to one another via communication lines in a master-slave fashion, respectively, to a numerical controller, so as to communicate data between I/O units and the numerical controller, wherein each of the I/O units includes:
- a detection unit detecting the power discontinuity when the power discontinuity occurs in the I/O unit;
- a transmission unit transmitting information on detection of power discontinuity to a front I/O unit situated immediately before a rear I/O unit which is said I/O unit where the power discontinuity occurs, at a timing different from a timing of normal data communication, in the form of a communication packet having a data pattern different from a data pattern utilized during said normal data communication;
- and
- a power discontinuity detection information storage unit receiving the communication packet when the communication packet is transmitted from the rear I/O unit and storing the received communication packet as the power discontinuity detection information.
Dependencies are inferred from the claim text.