CONNECTION ABNORMALITY DETECTION METHOD, NETWORK SYSTEM, AND MASTER DEVICE
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Accused Products
Abstract
A technique is provided for detecting a connection abnormality of a slave device, in a network system including a master device and slave devices. The technique includes a connection abnormality detection method in a network system including a master device and a plurality of slave devices. In the network system, data is transmitted from the master device and then returned to the master device through respective slave devices. Each slave device has an upstream-side port and a downstream-side port. The connection abnormality detection method includes acquiring topology information of the network system, closing or opening the port of each slave device such that a serial topology is formed to include a target slave device located on the downmost stream side, transmitting inspection data after the control of the port, and detecting a connection abnormality of the device on the basis of a status of return of the inspection data.
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Citations
15 Claims
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1-8. -8. (canceled)
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9. A connection abnormality detection method in a network system comprising a master device and a plurality of slave devices and having configurations that data is transmitted from the master device, is sequentially passed from the upmost stream-side slave device to the downmost stream-side slave device, and then is returned to the master device, and each slave device has a plurality of ports including an upstream-side port for connection to the upstream-side device and at least one downstream-side port for connection to the downstream-side device,
the connection abnormality detection method comprising: -
an acquisition step of acquiring topology information indicating a topology of the network system, in the master device; a port control step of switching between closing and opening of the port of each slave device such that the downmost stream-side slave device is defined as a target slave device to be inspected and a serial topology is formed from the master device to the target slave device, on the basis of the topology information, in the master device; a transmission step of transmitting inspection data after the port control step, in the master device; and a detection step of detecting a connection abnormality of the target slave device on the basis of a status of return of the inspection data, in the master device, wherein; when the topology of the network system includes branched portions, the master device selects one of the branched portions to form the serial topology in the port control step.
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10. A connection abnormality detection method in a network system comprising a master device and a plurality of slave devices and having configurations that data is transmitted from the master device, is sequentially passed from the upmost stream-side slave device to the downmost stream-side slave device, and then is returned to the master device, and each slave device has a plurality of ports including an upstream-side port for connection to the upstream-side device and at least one downstream-side port for connection to the downstream-side device,
the connection abnormality detection method comprising: -
an acquisition step of acquiring topology information indicating a topology of the network system, in the master device; a port control step of switching between closing and opening of the port of each slave device such that the downmost stream-side slave device is defined as a target slave device to be inspected and a serial topology is formed from the master device to the target slave device, on the basis of the topology information, in the master device; a transmission step of transmitting inspection data after the port control step, in the master device; and a detection step of detecting a connection abnormality of the target slave device on the basis of a status of return of the inspection data, in the master device, wherein; the topology information acquired by the master device in the acquisition step contains a position address defined on the basis of an order of connection of each slave device and a type of the port used for connection between the slave devices; the inspection data transmitted from the master device in the transmission step is data for confirming the number of slave devices in the serial topology formed in the port control step; and in the detection step, the master device determines that a connection abnormality corresponding to erroneous selection of one of the upstream-side port and the downstream-side port of the target slave device occurs, when there is a difference between an expected value of the number of devices including the target slave device, the expected value being obtained from the topology information and the position address, and the number of devices, the number being confirmed on the basis of the returned inspection data. - View Dependent Claims (11)
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12. A network system comprising:
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a master device; and a plurality of slave devices, wherein; data is transmitted from the master device, is sequentially passed from the upmost stream-side slave device to the downmost stream-side slave device, and then is returned to the master device; each slave device has a plurality of ports including an upstream-side port for connection to the upstream-side device and at least one downstream-side port for connection to the downstream-side device; the master device comprises a topology acquisition part for acquiring topology information indicating a topology of the network system, a port control part for switching between closing and opening of the port of each slave device such that the downmost stream-side slave device is defined as a target slave device to be inspected and a serial topology is formed from the master device to the target slave device, on the basis of the topology information, a transmission and reception part for transmitting inspection data after the control by the port control part, and receiving the returned inspection data, and a determination part for detecting a connection abnormality of the target slave device on the basis of a status of return of the inspection data; and when the topology of the network system includes branched portions, the port control part of the master device selects one of the branched portions to form the serial topology.
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13. A master device in a network system comprising the master device and a plurality of slave devices and having configurations that data is transmitted from the master device, is sequentially passed from the upmost stream-side slave device to the downmost stream-side slave device, and then is returned to the master device, and each slave device has a plurality of ports including an upstream-side port for connection to the upstream-side device and at least one downstream-side port for connection to the downstream-side device,
the master device comprising: -
a topology acquisition part for acquiring topology information indicating a topology of the network system; a port control part for switching between closing and opening of the port of each slave device such that the downmost stream-side slave device is defined as a target slave device to be inspected and a serial topology is formed from the master device to the target slave device, on the basis of the topology information; a transmission and reception part for transmitting inspection data after the control by the port control part, and receiving the returned inspection data; and a determination part for detecting a connection abnormality of the target slave device on the basis of a status of return of the inspection data, wherein; when the topology of the network system includes branched portions, the port control part selects one of the branched portions to form the serial topology.
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14. A network system comprising:
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a master device; and a plurality of slave devices, wherein; data is transmitted from the master device, is sequentially passed from the upmost stream-side slave device to the downmost stream-side slave device, and then is returned to the master device; each slave device has a plurality of ports including an upstream-side port for connection to the upstream-side device and at least one downstream-side port for connection to the downstream-side device; the master device comprises a topology acquisition part for acquiring topology information indicating a topology of the network system, a port control part for switching between closing and opening of the port of each slave device such that the downmost stream-side slave device is defined as a target slave device to be inspected and a serial topology is formed from the master device to the target slave device, on the basis of the topology information, a transmission and reception part for transmitting inspection data after the control by the port control part, and receiving the returned inspection data, and a determination part for detecting a connection abnormality of the target slave device on the basis of a status of return of the inspection data; the topology information acquired by the topology acquisition part of the master device contains a position address defined on the basis of an order of connection of each slave device and a type of the port used for connection between the slave devices; the inspection data transmitted from the transmission and reception part of the master device is data for confirming the number of slave devices in the serial topology formed by the port control part; and the determination part of the master device determines that a connection abnormality corresponding to erroneous selection of one of the upstream-side port and the downstream-side port of the target slave device occurs, when there is a difference between an expected value of the number of devices including the target slave device, the expected value being obtained from the topology information and the position address, and the number of devices, the number being confirmed on the basis of the returned inspection data.
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15. A master device in a network system comprising the master device and a plurality of slave devices and having configurations that data is transmitted from the master device, is sequentially passed from the upmost stream-side slave device to the downmost stream-side slave device, and then is returned to the master device, and each slave device has a plurality of ports including an upstream-side port for connection to the upstream-side device and at least one downstream-side port for connection to the downstream-side device,
the master device comprising: -
a topology acquisition part for acquiring topology information indicating a topology of the network system; a port control part for switching between closing and opening of the port of each slave device such that the downmost stream-side slave device is defined as a target slave device to be inspected and a serial topology is formed from the master device to the target slave device, on the basis of the topology information; a transmission and reception part for transmitting inspection data after the control by the port control part, and receiving the returned inspection data; and a determination part for detecting a connection abnormality of the target slave device on the basis of a status of return of the inspection data, wherein; the topology information acquired by the topology acquisition part contains a position address defined on the basis of an order of connection of each slave device and a type of the port used for connection between the slave devices; the inspection data transmitted from the transmission and reception part is data for confirming the number of slave devices in the serial topology formed by the port control part; and the determination part determines that a connection abnormality corresponding to erroneous selection of one of the upstream-side port and the downstream-side port of the target slave device occurs, when there is a difference between an expected value of the number of devices including the target slave device, the expected value being obtained from the topology information and the position address, and the number of devices, the number being confirmed on the basis of the returned inspection data.
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Specification