公开(公告)号：US20160277288A1

公开(公告)日：2016-09-22

申请号：US15033670

申请日：2014-09-05

Applicant: HITACHI, LTD.

Inventor： Tatsuya MARUYAMA ,  Tsutomu YAMADA ,  Chikashi KOMATSU ,  Mitsuyasu KIDO ,  Shouji YOSHIDA

IPC: H04L12/721 ,  H04L12/42

CPC classification number: H04L45/34 ,  H04L12/422 ,  H04L12/437 ,  H04L45/28 ,  H04L47/31

Abstract: An object of the present invention is to provide a network system or the like in which the construction cost of a network for a plurality of control systems is suppressed which is excellent in resistance to a network failure. In order to solve the problems, according to the present invention, there is provided a network system including a plurality of communication devices that are disposed in a plurality of bases, and are grouped into predetermined control systems for each of the devices which transmit and receive packets to and from each other so as to monitor or control target equipment, and a plurality of relay devices each of which includes a plurality of communication ports and transmits a packet transmitted by the communication device to another communication device, in which a plurality of communication devices disposed in each base are connected in parallel between the two relay devices, the relay devices disposed in different bases are connected to each other in a ring shape via a network, and a plurality of communication devices disposed in at least one base include communication devices belonging to different control systems.

Abstract translation: 本发明的目的是提供一种网络系统等，其中抑制了多个控制系统的网络的建设成本，其对网络故障的抵抗性优异。 为了解决这些问题，根据本发明，提供了一种网络系统，包括设置在多个基站中的多个通信设备，并且被分组为用于发送和接收的每个设备的预定控制系统 分组到彼此并且用于监视或控制目标设备，以及多个中继设备，每个中继设备包括多个通信端口，并将由通信设备发送的分组发送到另一个通信设备，其中多个通信 设置在每个基座中的装置并联连接在两个中继装置之间，设置在不同基座中的中继装置经由网络以环形方式彼此连接，并且设置在至少一个基座中的多个通信装置包括通信装置 属于不同的控制系统。

公开(公告)号：US20220329564A1

公开(公告)日：2022-10-13

申请号：US17639860

申请日：2020-06-23

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Noritaka MATSUMOTO ,  Hiroshi IWASAWA ,  Hiromichi ENDOH ,  Junya FUJITA

IPC: H04L9/40

Abstract: Conventional security measures are generally intended for an IT system, and it has been difficult to satisfy a real-time property and availability requested to a control system. Furthermore, since a time-division type time slot communication method is not taken into consideration, such time slot communication has problems in efficient utilization of computer resources and decrease in availability. In order to solve the above-described problems, the present invention specifies a time slot from characteristics of a communication packet received by a reception unit 133 by using a time slot characteristic storage unit 130, and selects, in accordance with the specified time slot, an inspection pattern stored in an inspection pattern storage unit 136 by using an inspection pattern selection unit 131.

公开(公告)号：US20210373065A1

公开(公告)日：2021-12-02

申请号：US17290284

申请日：2019-08-22

Applicant: HITACHI, LTD.

Inventor： Kazuhisa TAKAMI ,  Shoji YOSHIDA ,  Mitsuyasu KIDO ,  Tatsuya MARUYAMA

IPC: G01R31/12 ,  G01R31/14 ,  G01R31/52

Abstract: A partial discharge detection apparatus includes low-speed and high-speed AD converters. The low-speed AD converter converts an analog signal of an AC waveform flowing through a power cable into a digital signal. The high-speed AD converter converts an analog signal of a partial discharge current into a digital signal. The analog signal is in a plurality of Nyquist frequency domains defined for each of two different types of sampling frequencies. The partial discharge is detected by a partial-discharge-detection digital signal processing unit based on the maximum value or the sum of a current value obtained from the digital signal of the partial discharge current obtained by the conversion of the high-speed AD converter, for each phase of the AC waveform, which is obtained from the digital signal of the AC waveform flowing in the power cable. The digital signal is obtained by the conversion of the low-speed AD converter.

公开(公告)号：US20230098444A1

公开(公告)日：2023-03-30

申请号：US17794248

申请日：2020-10-09

Applicant: HITACHI, LTD.

Inventor： Kazutaka ONISHI ,  Yusaku OTSUKA ,  Tatsuya MARUYAMA

IPC: G06F13/10

Abstract: In a control system including one or more control nodes and one or more I/O nodes connected to one or more devices and communicable with the control nodes, the control nodes execute at least one control program on a first OS, and the I/O nodes execute at least one I/O program on a second OS with higher punctuality. The control program generates a control command based on state control set in advance for the device and transmits the control command to the I/O node. The I/O program stores the control command received from the control node in a storage unit, and executes processing related to the device according to the control command stored in the storage unit.

公开(公告)号：US20220128614A1

公开(公告)日：2022-04-28

申请号：US17600151

申请日：2020-04-23

Applicant: HITACHI, LTD.

Inventor： Hiromichi YAMADA ,  Tatsuya MARUYAMA ,  Mitsuyasu KIDO

IPC: G01R31/12

Abstract: A distribution pattern of a combination of a charge quantity and an occurrence phase angle of each of the partial discharges occurring in one or a plurality of cycle periods of an applied voltage of the power transmission cable is generated, differential data including a difference between the numbers of occurrences of the partial discharge for each combination of the charge quantity and the occurrence phase angle in two or more latest distribution patterns is generated, and the degree of progress of the partial discharge is determined based on data of the latest distribution patterns and the differential data.

公开(公告)号：US20240098660A1

公开(公告)日：2024-03-21

申请号：US17945948

申请日：2022-09-15

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA

IPC: H04W56/00 ,  H04W4/02 ,  H04W72/04

CPC classification number: H04W56/001 ,  H04W4/027 ,  H04W72/0446 ,  H04W72/0453

Abstract: In example implementations described herein, there are an apparatus, systems, and methods for identifying a state of a plurality of synchronized devices at a particular time. The method may further include allocating, based on the identified state of each of the plurality of synchronized devices, a set of time-synchronization resources for transmitting time-synchronization information from at least one device in the plurality of devices. The method may also include transmitting a control message to the at least one device in the plurality of devices indicating the allocated set of time-synchronization resources determined for transmitting the time-synchronization information from the at least one device.

公开(公告)号：US20200267094A1

公开(公告)日：2020-08-20

申请号：US16747775

申请日：2020-01-21

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Noritaka MATSUMOTO ,  Hidenori OOMIYA ,  Yuusaku OOTSUKA ,  Iori KOBAYASHI ,  Toshiki SHIMIZU

IPC: H04L12/911 ,  H04L12/24 ,  H04L12/917 ,  H04L29/08 ,  G05B13/02

Abstract: A communication control device of a communication system collects information of a first control device in a second control device via a relay device on a network. Allocation of network resources of the network is controlled based on a procedure of processing the collected information.

公开(公告)号：US20170094375A1

公开(公告)日：2017-03-30

申请号：US15182692

申请日：2016-06-15

Applicant: Hitachi, Ltd.

Inventor： Hiromichi YAMADA ,  Tsutomu YAMADA ,  Tatsuya MARUYAMA

IPC: H04Q3/56 ,  H04L12/815 ,  H04L12/741 ,  H04L29/06 ,  H04L12/931

CPC classification number: H04Q3/56 ,  H04L45/745 ,  H04L47/23 ,  H04L49/351 ,  H04L69/22 ,  H04Q2213/13322

Abstract: Provided are a communication processing device and a communication system, capable of securely updating a communication protocol process with a simple configuration and technique, while continuing communication. A communication processing device, which is connected to a communication network, includes a programmable logic device in which partial rewriting of a logic circuit is possible, during an operation of a host device in the communication network, in which the programmable logic device includes at least two communication processing circuits of which each performs a communication protocol process, and in which one communication processing circuit is operable due to switching, a first communication processing circuit performs communication, and a second communication processing circuit is on standby, updating means for downloading logic circuit data of an updated communication protocol process, from the communication network, and performing a circuit configuration for the second communication processing circuit, a flag that indicates whether or not the circuit configuration for the second communication processing circuit is finished, and by which a circuit configuration state is able to be read to the host device side through communication, and a register that is intended for switching to any one communication processing circuit to be used, and is writable from the host device side through communication.

公开(公告)号：US20140098706A1

公开(公告)日：2014-04-10

申请号：US14044895

申请日：2013-10-03

Applicant: Hitachi, Ltd.

Inventor： Tatsuya MARUYAMA ,  Tsutomu YAMADA ,  Mitsuyasu KIDO ,  Shoji YOSHIDA

IPC: H04J3/06

CPC classification number: H04J3/0638 ,  H04J3/0667 ,  H04L47/30

Abstract: Communication control equipment is connected to a plurality of communication control equipment via a network and is configured to be time-synchronized with the plurality of communication control equipment by using a time synchronization procedure using a communication including at least request packets and acknowledgement packets. The communication control equipment includes a receiving-interval measurement section configured to measure a receiving interval of request packets from the plurality of communication control equipment; and a queuing-occurrence determination section configured to detect conflict of the request packets from any of the plurality of communication control equipment on a basis of the receiving interval of the request packets measured by the receiving-interval measurement section. The communication control equipment is configured to determine whether to transmit an acknowledgement packet to the communication control equipment that has transmitted the request packets based on a detection result of the queuing-occurrence determination section.

Abstract translation: 通信控制设备经由网络连接到多个通信控制设备，并且被配置为通过使用至少包括请求分组和确认分组的通信的时间同步过程与多个通信控制设备进行时间同步。 通信控制设备包括接收间隔测量部分，被配置为测量来自多个通信控制设备的请求分组的接收间隔; 以及排队发生判定部，其基于由所述接收间隔测量部测量出的所述请求分组的接收间隔来检测来自所述多个通信控制设备中的任一个的所述请求分组的冲突。 通信控制设备被配置为基于排队发生确定部分的检测结果来确定是否向已发送请求分组的通信控制设备发送确认分组。

公开(公告)号：US20230009780A1

公开(公告)日：2023-01-12

申请号：US17911976

申请日：2020-09-01

Applicant: Hitachi, Ltd.

Inventor： Hiromichi ENDOH ,  Tatsuya MARUYAMA

IPC: H04L47/24 ,  H04L47/20 ,  H04L9/40

Abstract: Even when a priority frame and a non-priority frame are provided as communication frames, real-time performance and security of communications are both provided.
A rule verification portion 7 tests a communication frame in accordance with a test rule and determines whether the communication frame is an invalid frame. Verification status hold portions 4 and 5 hold status information that indicates a status of the test by the rule verification portion 7. An interception control portion 8 controls interception of the communication frame based on a determination result of the rule verification portion 7. When an I/F portion 1 receives a fragment of a non-priority frame, the rule verification portion 7 tests the fragment to test the non-priority frame, when ending the test on the fragment, interrupts the test on the non-priority frame, and when the I/F portion 1 receives a next fragment, resumes the test on the non-priority frame based on status information.