公开(公告)号：US20210111924A1

公开(公告)日：2021-04-15

申请号：US16970585

申请日：2019-01-15

Applicant: Hitachi High-Tech Corporation

Inventor： Kazushi YAMASHINA ,  Terunobu FUNATSU ,  Takashi SAEGUSA ,  Masahiro OHASHI ,  Yoshiro GUNJI ,  Yuuichi HAGINO ,  Yutaka KASAI ,  Tsukasa SUGAWARA ,  Junichi KITAMURA

IPC: H04L12/44

Abstract: In the present invention, device information is collected while real-time performance and high-speed performance of control-related normal communication are maintained. The distributed control system has: a central processing device; a central communication device; multiple terminal communication devices each having at least one controlled device connected thereto; an information storage device; and a network having a tree structure comprising multiple communication paths between the central communication device and the terminal communication devices, between the terminal communication devices, and between the terminal communication devices and the information storage device. The network is provided with a first communication path for connecting the upstream-side communication port of a terminal communication device with the downstream-side communication port of a terminal communication device and for connecting the upstream-side communication port of a terminal communication device with the normal communication port of the central communication device; and a second communication path for connecting between the downstream-side communication ports of terminal communication devices positioned at edges of the network and for connecting the downstream-side communication ports of the terminal communication devices with the device information communication port of the information storage device.