Network system using management frames for supervising control units
First Claim
1. A network system comprising:
- control units disposed for respective controlled devices to be controlled as nodes of a network, the nodes being connected to be capable of communicating data with one another, wherein each control unit has a function of transmitting a management frame for notifying its communication state to any other control units, and the control unit affixes information of a control cause determining its communication state to the management frame.
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Accused Products
Abstract
In a network system, each ECU transmits a start control frame when to start, and is started when it receives the start control frame from any other ECU during the stop of its operation. Besides, each ECU transmits a stop control frame cyclically during its operation, and continues its operation in spite of being capable of stopping its operation, while it is receiving the stop control frame from any other ECU. In transmitting each of the frames, each ECU affixes cause information expressive of a start cause or an operation stop incapability cause to the frame. In stopping a network, a supervisory device specifies the start ECU and the start cause thereof from the start control frame and stores them in a nonvolatile memory.
18 Citations
21 Claims
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1. A network system comprising:
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control units disposed for respective controlled devices to be controlled as nodes of a network, the nodes being connected to be capable of communicating data with one another, wherein each control unit has a function of transmitting a management frame for notifying its communication state to any other control units, and the control unit affixes information of a control cause determining its communication state to the management frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification