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CONTROL SYSTEM, CONTROL METHOD, AND CONTROLLER

  • US 20150295944A1
  • Filed: 07/01/2013
  • Published: 10/15/2015
  • Est. Priority Date: 07/01/2013
  • Status: Abandoned Application
First Claim
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1. A control system, comprising:

  • field equipment that executes a controlled process; and

    a controller that controls execution of the controlled process by the field equipment,wherein the controller includes;

    a controlled process status storing unit that stores a status of a controlled process;

    a security countermeasures management table storing unit that stores a security countermeasures management table associating controlled process statuses and security countermeasures methods;

    a security abnormality detecting unit that detects a security abnormality in the control system;

    a security countermeasure determining unit that determines one of the security countermeasures methods stored in the security countermeasures management table when a security abnormality in the control system has been detected by the security abnormality detecting unit;

    a security countermeasure executing unit that executes the one of the security countermeasures methods determined by the security countermeasure determining unit;

    a normal signal driving unit that transmits a normal signal onto a bus when neither a security abnormality nor a hardware abnormality is detected and stops transmitting the normal signal when either a security abnormality or a hardware abnormality is detected;

    a hardware abnormality detecting unit that detects a hardware abnormality and notifies the normal signal driving unit of the hardware abnormality, when detected;

    a controlled process stopping unit that stops a controlled process in response to a detected security abnormality detected by the security countermeasure determining unit and notifies the normal signal driving unit of the detected security abnormality; and

    one or more hardware units connected to the bus that are configured to constantly detect a presence/absence of the normal signal on the bus and perform a preconfigured action upon having detected stop of the normal signal.

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