Runaway detection/restoration device
First Claim
1. A runaway detection and restoration device comprising:
- a processor for controlling an apparatus,runaway detecting means for monitoring an abnormal state of a sequential control program of an operation of the apparatus to detect a runaway of the processor;
memory means for storing an operation mode of the apparatus when the runaway is detected by the runaway detecting means; and
restoration control means for regulating an operation in the operation mode when, by referring to the memory means at the time of the detection of the runaway, it is judged that the number of times the runaway is detected by the detecting means in the same operation mode exceeds a predetermined value.
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Accused Products
Abstract
The invention provides a runaway detection/restoration device which enables an automatic restoration of a high degree of safety and carries out the control of devices when the runaway of a CPU has been generated. The runaway detection/restoration device is provided with runaway detecting means such as a watchdog timer 89 or the like which monitors troubles in a sequential control program for the device operations, and a memory 87 which stores information related to the runaway detected by the runaway detecting means, for the CPU 82 which controls the devices. The runaway detection/restoration device judges whether or not the CPU 82 is automatically restored according to the information related to the runaway stored at the time of the detection of a new runaway, such as the number of times runaway was detected, operation mode at the time of the detection of the runaway and the generation frequency of the runaway.
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Citations
8 Claims
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1. A runaway detection and restoration device comprising:
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a processor for controlling an apparatus, runaway detecting means for monitoring an abnormal state of a sequential control program of an operation of the apparatus to detect a runaway of the processor; memory means for storing an operation mode of the apparatus when the runaway is detected by the runaway detecting means; and restoration control means for regulating an operation in the operation mode when, by referring to the memory means at the time of the detection of the runaway, it is judged that the number of times the runaway is detected by the detecting means in the same operation mode exceeds a predetermined value. - View Dependent Claims (2, 3, 4)
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5. A runaway detection and restoration device comprising:
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a processor for controlling an apparatus; runaway detecting means for monitoring an abnormal state of a sequential control program of an operation of the apparatus to detect the runaway of the processor; runaway generation frequency calculating means for calculating a runaway generation frequency on the basis of the use time from the detection of the previous runaway to the detection of the current runaway, in response to an output of the runaway detecting means; memory means for storing the runaway generation frequency in response to an output from the runaway generation frequency calculating means; and restoration control means for judging whether or not the processor is to be automatically restored, depending on the runaway generation frequency in the memory means when the runaway is detected. - View Dependent Claims (6)
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7. A runaway detection and restoration device comprising:
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a processor for controlling an apparatus, runaway detecting means for monitoring an abnormal state of a sequential control program of an operation of the apparatus, the runaway detecting means comprising a plurally of detecting sections which detect the runaway of the processor, and for each of which a predetermined runaway evaluation value is predetermined; memory means for storing a runaway evaluation value determined for each detecting section, the value being given from the detecting section of the runaway detecting means which has detected the runaway; and restoration control means for allowing the processor to be automatically restored when the runaway evaluation value of the memory means is smaller than a predetermined value and for suspending the control of the apparatus when the evaluation value is larger than the predetermined value at the time of the detection of the runaway.
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8. A runaway detection and restoration device comprising:
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a processor for controlling an apparatus, runaway detecting means for monitoring an abnormal state of a sequential control program of an operation of the apparatus to detect a runaway of the processor; first memory means for storing information related to the runaway detected by the runaway detecting means; second memory means for storing information related to an operation of the apparatus when the runaway is detected by the runaway detecting means; verifying means for confirming the information stored in the second memory means; and restoration control means for judging whether or not the processor is to be automatically restored depending on the content of the information related to the runaway stored in the first memory when the information stored in the second memory means is abnormal.
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Specification