| 摘要 |
PROBLEM TO BE SOLVED: To enable axis control required when a communication abnormality occurs in servo motor control that is driven by a plurality of servo amplifiers connected to a plurality of serial buses. SOLUTION: A numerical control device has the plurality of serial buses where the numerical control device and the plurality of servo amplifiers are connected by a daisy chain, and controls servo motors connected to the servo amplifiers. The numerical control device comprises: a plurality of communication control circuits 5 for detecting each communication abnormality of a plurality of serial buses; and a selection means 6 for selecting whether the communication abnormality is notified to other communication control circuits, when having detected the communication abnormality at any one of a plurality of communication control circuits. In the control of the servo motors driven by the servo amplifiers connected to the plurality of serial buses, the output to the servo amplifier connected to the serial bus where the communication abnormality occurs is made zero, and the output to the servo amplifier connected to the serial bus where the communication abnormality does not occur is maintained, thereby enabling the control of the servo motors. COPYRIGHT: (C)2006,JPO&NCIPI
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