Servo-amplifier for a multiaxis driving control system

• US 6,535,938 B1
• Filed: 11/09/1999
• Issued: 03/18/2003
• Est. Priority Date: 07/02/1999
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Teramura, Mamoru, Matsumoto, Kouki
• Primary Examiner(s): Auve, Glenn A.
• Assistant Examiner(s): King, Justin
• Application Number:
  US09/436,645
• Time in Patent Office: 1,225 Days
• Field of Search: 710/105, 710/315, 180/169, 180/272
• US Class Current: 710/105
• CPC Class Codes: G06F 13/4247 on a daisy chain bus

Abstract

A servo-amplifier has a RS232C-communication I/F circuit, a RS422 (RS485) communication I/F circuit, and a CPU 11. The CPU 11 of this servo-amplifier fetches data received by the RS232C-communication I/F circuit into a local station, converts the received data to communication data for RS422 (RS485) and transmits the converted data from the RS422 (RS485) communication I/F circuit to other stations, converts the data received by the RS422 (RS485) communication I/F circuit to communication data for RS232C and transmits the converted data from the RS232C-communication I/F circuit to other stations.

Claims

1. A servo-amplifier for a multiaxis driving control system that drives and controls an axis by transmitting and receiving to and from a RS232C communication medium in charge of communications and other servo-amplifiers, and communication data including an axis number indicating a communication destination, the servo-amplifier comprising:

a central processing unit;

a RS232C communication interface circuit;

a RS422 (RS485) communication interface circuit; and

a switch that selectively connects a transmission side of the RS232C communication interface circuit to one of a reception side of the RS422 (RS485) communication interface circuit and the central processing unit,

wherein the central processing unit;

fetches communication data received through the RS232C communication interface circuit,

converts the received communication data into communication data for RS422 (RS485) and transmits the converted communication data to another servo-amplifier through the RS422 (RS485) communication interface circuit,

controls the switch to connect the transmission side of the RS232C communication interface circuit with the central processing unit and transmits the communication data to the RS232C communication medium, when the axis number included in the communication data received through the RS232C communication interface circuit specifies a station the servo-amplifier belongs to, and

controls the switch to connect the transmission side of the RS232C communication interface circuit with the reception side of the RS422 (RS485) communication interface circuit and transmits communication data received from another servo-amplifier to the RS232C communication medium, when the axis number included in the communication data received through the RS232C communication interface circuit specifies a destination other than the station.

2. A servo-amplifier for a multiaxis driving control system that drives and controls an axis by transmitting and receiving to and from a RS232C communication medium in charge of communications and other servo-amplifiers, communication data including an axis number indicating a communication destination, the servo-amplifier comprising:

a central processing unit;

a RS232C communication interface circuit;

a RS422 (RS485) communication interface circuit;

a reception switch that selectively connects an input of the central processing unit to one of a reception side of the RS232C communication interface circuit and a reception side of the RS422 (RS485) communication interface circuit;

a first transmission switch that selectively connects a transmission side of the RS232C communication interface circuit to one of the reception side of the RS422 communication interface circuit and an output of the central processing unit; and

a second transmission switch that selectively connects a transmission side of the RS422 (RS485) communication interface circuit to one of the reception side of the RS232C communication interface circuit and the output of the central processing unit,

wherein the central processing unit controls;

the reception switch to connect the input of the central processing unit with the reception side of the RS232 communication interface circuit and the second transmission switch to connect the transmission side of the RS422 (RS485) communication interface circuit with the output of the CPU, while the central processing unit is waiting to receive communication data from the RS232C communication medium,

the first transmission switch to connect the transmission side of the RS232C communication interface circuit with the output of central processing unit and transmits the communication data to the RS232C communication medium, when the axis number included in the communication data received through the RS232C communication interface circuit specifies a station the servo-amplifier belongs to, and

the first transmission switch to connect the transmission side of the RS232C communication interface circuit with the reception side of the RS422 (RS485) communication interface circuit and transmits communication data received from another servo-amplifier to the RS232C communication medium, when the axis number included in the communication data received through the RS232C communication interface circuit specifies a destination other than the station.

3. The servo-amplifier for a multiaxis driving control system according to claim 2, wherein, when the central processing unit transmits and receives communication data to and from another servo-amplifier, the central processing unit controls:

the reception switch to connect the input of the central processing unit to the reception side of the RS422 (RS485) communication interface circuit, and

the second transmission switch to connect the transmission side of the RS422 (RS485) communication interface circuit with the output of the central processing unit.