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Patent Searching and Data


Title:
DECENTRALIZED CONTROLLER
Document Type and Number:
Japanese Patent JPH06253373
Kind Code:
A
Abstract:

PURPOSE: To reduce communication burdens, to easily confirm the omission of messages and to surely inform an opposing reception station side of the messages.

CONSTITUTION: Controllers FC1 and FC2 are provided with a message transmission means 2 for receiving the message outputted by a process control means 1, adding a sequence number and broadcasting the message on a communication bus and a message retransmitting means 3 for receiving a retransmission request to which the sequence number to be received is added through the communication bus VN and transmitting the message corresponding to the sequence number to a retransmission request source. An operator station OP1 is provided with a message reception means 6 provided with functions for receiving the message broadcasted on the communication bus, extracting and preserving the sequence number added to the message, comparing it with the sequence number added to the message received in a previous time and judging whether or not message omission is present and a retransmission requesting means 7 for transmitting retransmission request signals through the communication bus to a message transmission source when the message omissmon is judged.


Inventors:
TO TETSUYA
Application Number:
JP3182793A
Publication Date:
September 09, 1994
Filing Date:
February 22, 1993
Export Citation:
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Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
H04Q9/00; H04L12/40; (IPC1-7): H04Q9/00; H04L12/40
Attorney, Agent or Firm:
小沢 信助