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Transmission frame structure for control communication network of distributed control system for nuclear power plant

  • US 20060007927A1
  • Filed: 04/12/2005
  • Published: 01/12/2006
  • Est. Priority Date: 04/12/2004
  • Status: Abandoned Application
First Claim
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1. A transmission frame structure of a control communication network for use in a nuclear-power-plant distributed control system which broadcasts data received from a node having transmission authority to all nodes via bypass line, and allows a ring accelerator to pass the data by a roundabout way and to isolate an erroneous station from normal stations, comprising:

  • a transmission frame including;

    a destination address for performing the broadcasting operation;

    a source address for recording a source node address (ID) therein;

    a type/length field for classifying frames into a control data frame and a network management even frame;

    a network management (NM_TYPE) field which is valid only when it is designated by type/length field, and performs different roles according to network management event frame types;

    a Seq&

    Ver field for including the number of transmissions of a data frame and frame upgrade version information;

    a NS_ID field for recording number information of a node equal to the next token reception node, and being used when one station transmits a token to the next station;

    a data field having predetermined maximum size 1 kbyte, for including not only general control information according to a value of the type/length field, but also 7 event frames (i.e., NM_TOKEN_FRAME, NM_DUAL_CH_CHECK_FRAME, NM_DUAL_CH_READY_FRAME, NM_NM_LINK_CHECK_FRAME, NM_NM_NODE_FAIL_FRAME, NM_NODE_CHECK_FRAME, and NM_TX_MODE_FRAME frames) such as a token frame; and

    a CRC (Cyclic Redundancy Code) field for inspecting the presence or absence of a CRC error, whereby the transmission frame operates the communication network, solves a malfunction of the communication network, and recovers the communication network.

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