Diagnostic device, diagnostic method, and network system having diagnostic facility
First Claim
1. A network diagnostic device, comprising:
- a diagnostic communication line connected to all of a plurality of control units, each of the control units being connected to a common communication line via its corresponding branch line to enable a mutual communication with the other control unit;
a normal state determining section that operatively performs such a network diagnostic processing as to cause each one of the control units to transmit an interrogation signal to all of the other control units and as to determine whether an acknowledgement signal is transmitted from each of the all of the other control units to the each one of the control units in response to the interrogation signal within a predetermined period of time to determine a normal state of a communication between each one of the control units and the other thereof; and
a map display section that displays a correlation map in a matrix form having a plurality of matrix intersections, each matrix intersection being a one-to-one combination of any one of the control units and the other of the control units and being displayed in a pattern to discriminate between the normal state of the communication and an abnormal state thereof.
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Accused Products
Abstract
In a network system having a network diagnostic facility, a plurality of control units are provided, each one of the control units being connected to a common communication line via its corresponding branch line to enable a mutual communication with the other control unit; and a normal state checking facility responsive to a diagnostic command signal from a network diagnostic device to transmit an interrogation signal from any one of the control units to all of the other control units which are connected to the common communication line and to output respective results of receiving acknowledgement signals from the all of the other control units within respective constant periods of time in response to the interrogation signal transmitted from the one of the control units to the diagnostic device, the health state checking facility being installed on each of the control units. The network diagnostic device generates a correlation map for an engineer to intuitively recognize a location of the failure in the network system.
23 Citations
10 Claims
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1. A network diagnostic device, comprising:
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a diagnostic communication line connected to all of a plurality of control units, each of the control units being connected to a common communication line via its corresponding branch line to enable a mutual communication with the other control unit;
a normal state determining section that operatively performs such a network diagnostic processing as to cause each one of the control units to transmit an interrogation signal to all of the other control units and as to determine whether an acknowledgement signal is transmitted from each of the all of the other control units to the each one of the control units in response to the interrogation signal within a predetermined period of time to determine a normal state of a communication between each one of the control units and the other thereof; and
a map display section that displays a correlation map in a matrix form having a plurality of matrix intersections, each matrix intersection being a one-to-one combination of any one of the control units and the other of the control units and being displayed in a pattern to discriminate between the normal state of the communication and an abnormal state thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A network diagnostic method, comprising:
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connecting a diagnostic communication line to all of a plurality of control units, each of the control units being connected to a common communication line via its corresponding branch line to enable a mutual communication with the other control unit;
performing such a network diagnostic processing as to cause each one of the control units to transmit an interrogation signal to all of the other control units and as to determine whether an acknowledgement signal is transmitted from each of the all of the other control units to the each one of the control units in response to the interrogation signal within a predetermined period of time to determine a normal state of a communication between each one of the control units and the other thereof; and
displaying a correlation map in a matrix form having a plurality of matrix intersections, each matrix intersection being a one-to-one combination of any one of the control units and the other of the control units and being displayed in a pattern to discriminate between the normal state of the communication and an abnormal state thereof.
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10. A network system having a network diagnostic facility, comprising:
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a plurality of control units, each one of the control units being connected to a common communication line via its corresponding branch line to enable a mutual communication with the other control unit;
a normal state checking facility responsive to a diagnostic command signal from an external to the network system to transmit an interrogation signal from any one of the control units to all of the other control units which are connected to the common communication line and to output respective results of receiving acknowledgement signals from the all of the other control units within respective constant periods of time in response to the interrogation signal transmitted from the one of the control units to the external to the network system, the normal state checking facility being installed on each of the control units.
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Specification