Title:
TIME SYNCHRONIZATION SYSTEM, MASTER DEVICE, SLAVE DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2020/217286
Kind Code:
A1
Abstract:
A time synchronization system (100) is provided with a master device (1) and slave devices (2A, 2B, 2C) that are connected to one another through a data bus (4) and a dedicated signal line (3) that transmits a fixed-cycle signal. The master device (1) transmits the fixed-cycle signal in a fixed transmission cycle via the signal line (3). The master device (1) transmits, via the data bus (4), start time information that indicates a transmission start time of the fixed-cycle signal and transmission cycle information that indicates a transmission cycle of the fixed-cycle signal. The slave devices (2A, 2B, 2C) each count the number of times of reception of the fixed-cycle signal, and calculate a transmission time of the fixed-cycle signal in the master device (1) as the present time of the master device (1) on the basis of the number of times of reception of the fixed-cycle signal, the transmission start time indicated by the start time information, and the transmission cycle indicated by the transmission cycle information. The slave devices (2A, 2B, 2C) make correction from the respective times to the present time of the master device (1).
Inventors:
HIOKI EITARO (JP)
UCHIYAMA NAOYA (JP)
UCHIYAMA NAOYA (JP)
Application Number:
PCT/JP2019/017084
Publication Date:
October 29, 2020
Filing Date:
April 22, 2019
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G06F1/14; H04L7/00; H04L12/70
Foreign References:
| JPH11203250A | 1999-07-30 | |||
| JPH04294413A | 1992-10-19 | |||
| JPH05134062A | 1993-05-28 |
Attorney, Agent or Firm:
KIMURA Mitsuru (JP)
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