| 摘要 |
PROBLEM TO BE SOLVED: To facilitate reliably transmitting a message frame, and also reduce load on a reception node side. SOLUTION: Each node in a ring type network system includes: an identifying part which adds, to a message frame to be transmitted from the node, identification information for identifying the message frame as a new message frame; a delivery confirmation part 221 which adds reception failure information to a message frame when failing in reception of the message frame; a retransmission part which retransmits a message frame when reception failure information is added to a message frame transmitted from the node and returned to the node; an information holder which holds the transmission source node information and identification information of a new received message frame; and a deleting part which deletes a received message frame, when comparing the transmission source node information and identification information of a received message frame with the transmission source node information and identification information held in the information holder and when the comparison result is matched. COPYRIGHT: (C)2011,JPO&INPIT |
