Drive control system

• US 6,792,330 B1
• Filed: 12/10/2001
• Issued: 09/14/2004
• Est. Priority Date: 07/06/1999
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Matsumoto, Kouki, Kawai, Daisuke, Kumekawa, Shizuo
• Primary Examiner(s): Picard, Leo
• Assistant Examiner(s): Masinick, Michael D.
• Application Number:
  US10/009,334
• Time in Patent Office: 1,009 Days
• Field of Search: 700/193, 700/18, 700/24, 700/63, 700/114
• US Class Current: 700/193
• CPC Class Codes: G05B 19/4141 characterised by a controller or microprocessor per axis
• CPC Class Codes: G05B 19/4144 characterised by using multiplexing for control system
• CPC Class Codes: G05B 2219/33154 Data exchange between processors of different axis of same or different cnc
• CPC Class Codes: G05B 2219/33187 Serial transmission rs232c, rs422, rs485 communication link
• CPC Class Codes: G05B 2219/33244 Packet information exchange
• CPC Class Codes: G05B 2219/34069 Shared memory

Abstract

A drive control system having constituent devices such as control unit for drive control, servo amplifier for driving motor by receiving a command from the control unit, spindle amplifier, and input and output unit, with these constituent devices connected so as to communicate with each other, in which a memory is provided in each constituent device, the constituent devices are synchronized with each other, a communication unit is provided for transferring memory data between arbitrary constituent devices, and the memory is shared between arbitrary constituent devices.

Claims

1. A drive control system having constituent devices connected so as to communicate with each other,

wherein a memory is provided in each of the constituent devices, the constituent devices of the drive control system are synchronized with each other, a communication unit is provided for transferring memory data between selected constituent devices of the drive control system, and at least one of said memory that is provided in each of the constituent devices of the drive control system, is shared simultaneously between said selected constituent devices of the drive control system.

11. The drive control system of claim 1, wherein said constituent devices comprise at least one of a control unit, a servo amplifier, a spindle amplifier, and an input/output unit.

2. A drive control system having constituent devices connected so as to communicate with each other,

wherein a memory is provided in each of the constituent devices, the constituent devices are synchronized with each other, a communication unit is provided for transferring memory data between selected constitutent devices, and at least one of said memory that is provided in each of the constituent devices, is shared simultaneously between said selected constituent devices,

wherein communication data comprises a synchronous packet used for generating a clock transmitted in a specific method period so that all constituent devices are synchronized therewith, an in-channel communication packet used for sharing said at least one of said memory within a same group, an allout communication packet used for sharing said at least one of said memory between all constituent devices, and a designated destination communication packet for communicating by designating the destination of transmission of a parameter.

3. The drive control system of claim 2, comprising a control unit and a servo amplifier, wherein each of the control unit and servo amplifier has a communication memory in each channel, a transmitter transmits the in-channel communication packet including a channel designated value, an address, a transmission data length and data to all constituent devices, and a receiver judges approval or rejection of reception by collating the channel designated value included in the communication packet and a channel set value set in a parameter in each servo amplifier, and writes the data of the communication packet of the collated channel in the communication memory.

5. The drive control system of claim 2, wherein a transmitter adds a redundancy code to the communication packet in every quantity of data that is based on the size of a buffer, and a receiver detects communication failure according to the redundancy code in every quantity of data that is based on the size of the buffer, and writing into said at least one of said memory is stopped, if abnormal.

6. The drive control system of claim 2, wherein a waiting time of each communication following the synchronous packet is shortened depending on a priority order, and when a constituent device high in priority order starts transmission within the waiting time, reception is started, and after completion of reception, if another constituent device does not start transmission after lapse of a specified waiting time, transmission is started.

10. The drive control system of claim 3, wherein the servo amplifier has a regenerative resistor selectively set in conductive state by a regenerative transistor, said at least one of said memory storing regenerative load factor data of each axis, regenerative transistor state data, and bus voltage data that is shared by the servo amplifier, and the bus voltage data is controlled to turn on the regenerative transistor of the servo amplifier smallest in the regenerative load factor data known from these data.

4. A drive control system having constituent devices connected so as to communicate with each other,

wherein a memory is provided in each of the constituent devices, the constituent devices are synchronized with each other, a communication unit is provided for transferring memory data between selected constituent devices, and at least one of said memory that is provided in each of the constituent devices, is shared simultaneously between said selected constituent devices,

said drive control system comprising a control unit, a servo amplifier, and an input and output unit, each having allout communication memories, wherein a transmitter transmits an allout communication packet including a sender number, an address, a transmission data length, a variable data length, previous data, and rewrite data to all constituent devices, a receiver compares the received previous data and the data in the present allout communication memory, the data in the allout communication memory is rewritten, if matched, and writing into the allout communication memory is stopped, if not matched.

7. A drive control system having constituent devices connected so as to communicate with each other,

wherein a memory is provided in each of the constituent devices, the constituent devices are synchronized with each other, a communication unit is provided for transferring memory data between selected constituent devices, and at least one of said memory that is provided in each of the constituent devices, is shared simultaneously between said selected constituent devices,

wherein said at least one of said memory stores input data, output data, position command, and speed command, is shared by the constituent devices.

8. The drive control system of claim 7, wherein present position data of each axis is shared by a synchronous axis, and the synchronous axis is controlled to prevent deviation of synchronism by referring to the position data.

9. The drive control system of claim 7, wherein present speed data of each axis is shared by a synchronous axis, and the synchronous axis is controlled to prevent deviation of synchronism by referring to the speed data.

12. A drive control system having a plurality of constituent devices connected so as to communicate with each other,

wherein a memory and a communication unit are provided in each of the constituent devices of the drive control system, the constituent devices of the drive control system are synchronized with each other, the communication unit transfers memory data between at least two of the constituent devices of the drive control system so that identical memory data are simultaneously stored in the memory in said at least two of the constituent devices of the drive control system, thereby enabling the memory provided in said at least two of the constituent devices of the drive control system to be used as shared memories.