Abstract: A numerical controller and a servomotor control system, capable of axis control required in case of a communication failure in the control of servomotors driven by servo amplifiers connected to a plurality of serial buses. The numerical controller has a plurality of serial buses to which the numerical controller and a plurality of servo amplifiers are daisy-chain-connected and controls servomotors connected individually to the servo amplifiers. The device comprises a plurality of communication control circuits for detecting respective communication failures of the serial buses and selecting means for selecting whether or not to notify the other communication control circuits of a communication failure, if any, of any one of the communication control circuits detected thereby.

Abstract: An analog amplifier performs control of a motor at the speed in proportion to a speed instruction (analog voltage) outputted from a numerical control device. The speed instruction (analog value) is converted into a digital value by an A/D converter and is then sent to a CPU. When the CPU judges that the received digital value corresponding to the speed instruction deviates from a predetermined range, the CPU stops sending out an enable signal, and sends out an emergency stop signal. As a result, the CPU stops electric power supply to the analog amplifier, and also invalidates the speed instruction sent to the analog amplifier 20, thereby performing control to make the speed of the motor become “0”.

Abstract: In a servo control system, a numerical control device and at least one servo amplifier are connected to each other with a serial bus to control a servo motor connected to the servo amplifier. In this system, data transfer systems of at least two types for the serial bus are set, and a data transfer system is selected by a parameter set in the numerical control device.

Abstract: A transmission path delay is set in a shift setting register. A slave unit generates a PRE_ITP signal in response to a timing signal (ITP signal) issued by a master unit. The phase difference between this PRE_ITP signal and the ITP signal unique to the slave unit is loaded into a period modification counter. A timer corrects a reference value, outputs position/speed control period signals (SYN signals) and counts down the period modification counter with these SYN signals until the period modification counter reaches zero. Furthermore, the ITP signal unique to the slave unit is outputted every time a predetermined number of the SYN signals are outputted.

Abstract: A data table stored in a numerical controller associates motors controlled by the numerical controller with information from sensors used by the motors. When the numerical controller is turned on, the contents of the data table are sent from the numerical control section to the motor control section. The motor control section controls each motor by using information from the sensors associated with the motor in the data table.

Abstract: An analog amplifier performs control of a motor at the speed in proportion to a speed instruction (analog voltage) outputted from a numerical control device. The speed instruction (analog value) is converted into a digital value by an A/D converter and is then sent to a CPU. When the CPU judges that the received digital value corresponding to the speed instruction deviates from a predetermined range, the CPU stops sending out an enable signal, and sends out an emergency stop signal. As a result, the CPU stops electric power supply to the analog amplifier, and also invalidates the speed instruction sent to the analog amplifier 20, thereby performing control to make the speed of the motor become “0”.

Abstract: A numerical controller and a servomotor control system, capable of axis control required in case of a communication failure in the control of servomotors driven by servo amplifiers connected to a plurality of serial buses. The numerical controller has a plurality of serial buses to which the numerical controller and a plurality of servo amplifiers are daisy-chain-connected and controls servomotors connected individually to the servo amplifiers. The device comprises a plurality of communication control circuits for detecting respective communication failures of the serial buses and selecting means for selecting whether or not to notify the other communication control circuits of a communication failure, if any, of any one of the communication control circuits detected thereby.

Abstract: An error decoding circuit comprises a syndrome computing circuit for computing a syndrome on a receive data, an error detecting circuit for detecting an error based on the syndrome, an error pattern computing circuit for computing an error pattern based on the syndrome, and an inverting circuit for performing an error correction of a receive data based on the computed error pattern. Only when there is an error in the receive data, based on the detection result of the error detecting circuit, a request signal for extension of a bus cycle is outputted to a bus master. On the other hand, if there is no error in the receive data, an inputted data is outputted to a data bus without correction. By so doing, the high speed operation of the data bus is executed.

Abstract: A data table stored in a numerical controller associates motors controlled by the numerical controller with information from sensors used by the motors. When the numerical controller is turned on, the contents of the data table are sent from the numerical control section to the motor control section. The motor control section controls each motor by using information from the sensors associated with the motor in the data table.

Abstract: In a servo control system, a numerical control device and at least one servo amplifier are connected to each other with a serial bus to control a servo motor connected to the servo amplifier. In this system, data transfer systems of at least two types for the serial bus are set, and a data transfer system is selected by a parameter set in the numerical control device.