Time synchronization system and method of numerical control system bus device

A technology of time synchronization system and bus equipment, which is applied in the direction of bus network, time division multiplexing system, data exchange through path configuration, etc. It can solve the problems of bus time synchronization and achieve the effect of eliminating poor real-time performance

Active Publication Date: 2017-12-12
SHANGHAI LYNAC NUMERICAL CONTROL TECH CO LTD
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a time synchronization system and method for the bus equipment of the numeri...

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  • Time synchronization system and method of numerical control system bus device
  • Time synchronization system and method of numerical control system bus device
  • Time synchronization system and method of numerical control system bus device

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Embodiment

[0046] A time synchronization system for bus equipment of a numerical control system, such as Figure 4 As shown, the bus device includes an EtherCAT master station, several EtherCAT slave stations, a master station of the first bus, and several slave stations of the first bus. The lines without arrows in the figure indicate the connection relationship of each module, and the lines with arrows indicate the direction of time distribution.

[0047] Wherein, the function of the EtherCAT master station is to send and receive EtherCAT data frames to realize data exchange with slave station devices. Since the data frame structure of EtherCAT is compatible with standard Ethernet, the transmission and reception of EtherCAT data frames can be realized by using a standard Ethernet controller. In this embodiment, the EtherCAT master station includes a control computer 31 and an Ethernet controller 32, the control computer 31 is used for controlling EtherCAT communication and data proces...

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Abstract

The invention discloses a time synchronization system and method of a numerical control system bus device. The time synchronization system comprises an EtherCAT master station, a first EtherCAT salve station and a master station of a first bus; the EtherCAT master station sends a current time and a bus communication period to the first salve station during the initialization; the first salve station generates a synchronizing signal according to a reference clock during the communication within the bus communication period and sends the synchronizing signal to the master station of the first bus; the master station of the first bus sends a data frame to the salve station of the first bus and sends synchronizing information to the EtherCAT master station after receiving the synchronizing signal; and the EtherCAT master station allocates time information to the rest EtherCAT salve station after receiving the synchronizing information. By adoption of the time synchronization system and method, the defects that when the EtherCAT bus and other buses are mixed for use, the time on the bus cannot be synchronized in the prior art is compensated, the time jitter is completely eliminated, and time synchronization is realized.

Description

technical field [0001] The invention relates to a time synchronization system and method for bus equipment of a numerical control system. Background technique [0002] At present, the commonly used buses in the field of numerical control include EtherCAT, RTEX, Mechatrolink-II / III, etc. EtherCAT is an Ethernet-based bus protocol that can be implemented using standard Ethernet hardware devices and driver software. In the numerical control system, in order to synchronize the time of the EtherCAT master station and all EtherCAT slave stations, the "distributed clock" technology in the EtherCAT protocol is usually used, that is, an EtherCAT slave station with the "distributed clock" function closest to the EtherCAT master station 11 Distribute the local clock to the EtherCAT master station 10 and other slave stations 12, 13, so that the clocks of each slave station are kept synchronized, specifically as figure 1 shown. RTEX, Mechatrolink-II / III and other bus technologies usua...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04L12/40
CPCH04J3/0658H04L12/40
Inventor 黄云龙袁再松刘声发
Owner SHANGHAI LYNAC NUMERICAL CONTROL TECH CO LTD
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