CONTROL SYSTEM, CONTROL METHOD, AND CONTROLLER
First Claim
Patent Images
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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Abstract
In case a security abnormality has been detected in a control system, ensuring the safety of the control system is accomplished. In a control system including field equipment that executes a controlled process and a controller that controls execution of a controlled process by the field equipment, the controller detects a security abnormality in the control system and determines and executes a security countermeasure method against the security abnormality based on a status of a controlled process when the security abnormality has been detected in the control system.
13 Citations
15 Claims
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1. A control system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. (canceled)
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7. A control method for use in a control system including field equipment that executes a controlled process and a controller that controls execution of a controlled process by the field equipment, the controller executing steps of:
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detecting a security abnormality in the control system; determining and executing a security countermeasure method against the security abnormality based on a status of a controlled process when the security abnormality has been detected in the control system; detecting a hardware abnormality and notifying the hardware abnormality, when detected; notifying a security abnormality when responding to a command to stop the controlled process based on the security countermeasure method; transmitting a normal signal onto a bus when neither a security abnormality nor a hardware abnormality is detected and stopping transmitting the normal signal onto the bus when either a security abnormality or a hardware abnormality is detected; and connecting one or more hardware units to a bus and continuously detecting a presence/absence of the normal signal on the bus and performing a preconfigured action upon detecting a stop of the transmitting of the normal signal. - View Dependent Claims (8, 9, 10)
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11. A controller that controls execution of a controlled process by field equipment, comprising:
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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 a 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 the 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. - View Dependent Claims (12, 13, 14, 15)
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Specification