Patents by Inventor Katsumi YAMAGIWA

Katsumi YAMAGIWA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Programmable logic controller, slave device, and duplex system
    Patent number: 10234841
    Abstract: A programmable logic controller includes a state monitoring unit to monitor a state of another programmable logic controller that is a counterpart in the duplication, and a system switching control unit to transmit, to a slave device, status information including information indicating whether the programmable logic controller is a control system or a standby system, to receive the control data that is addressed to the programmable logic controller that is the control system and is transmitted from the slave device in a case where the programmable logic controller is the control system, and to switch the programmable logic controller to the control system when hindrance in the another programmable logic controller is detected in a case where the programmable logic controller is the standby system.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: March 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Katsuhiro Annen, Katsumi Yamagiwa
  • PROGRAMMABLE LOGIC CONTROLLER, SLAVE DEVICE, AND DUPLEX SYSTEM
    Publication number: 20180039248
    Abstract: A programmable logic controller includes a state monitoring unit to monitor a state of another programmable logic controller that is a counterpart in the duplication, and a system switching control unit to transmit, to a slave device, status information including information indicating whether the programmable logic controller is a control system or a standby system, to receive the control data that is addressed to the programmable logic controller that is the control system and is transmitted from the slave device in a case where the programmable logic controller is the control system, and to switch the programmable logic controller to the control system when hindrance in the another programmable logic controller is detected in a case where the programmable logic controller is the standby system.
    Type: Application
    Filed: April 22, 2015
    Publication date: February 8, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Katsuhiro ANNEN, Katsumi YAMAGIWA