Control information transmission system

Abstract

A control information transmission system (10), which is provided with at least two of a plurality of master controllers (1a to 1n) that may serve as transmission master stations, and controls cyclic and continuous transmission between the transmission stations. A transmission control circuit (12) for controlling the transmission of signals, wherein the transmission control circuit (12) has: a station number holding unit (20) that holds each unique station number of the main controller (1a-1n); other stations operate A judging section (21), which, in the transmission processing operation of the own station as the transmission master station, judges the transmission processing operation of other stations according to the station numbers of other stations; The operation judging unit (21) stops the operation of the own station as the transfer master station to prevent the occurrence of multiple transfer master stations when it judges that other stations are performing transfer processing operations as the transfer master station.

Description

technical field [0001] The present invention relates to a control information transmission system, in particular to a control information transmission system with a control device for controlling the transmission of control signals. Cyclic continuous (serial) transmission. Background technique [0002] A system with a transmission line (line) that cyclically and continuously transmits control information is applied to an elevator control system that controls elevators, as well as space monitoring of roads, rivers, spaces, etc., and conditions in buildings, factories, etc. Various fields such as monitoring systems in the field of surveillance, condition monitoring of various structures, machinery, and electrical equipment, etc. In this specification, from the control information transmission systems applicable to all systems that continuously transmit control information cyclically, the elevator control information transmission system is selected as an example for illustrati...

AI Technical Summary

Problems solved by technology

[0007] However, according to the technologies proposed in Patent Document 1 and Patent Document 2, there is a disadvantage that when the transmission master station has some kind of abnormality and cannot transmit address information, even if other transmission stations are normal, the data cannot be transmitted.

In the case where the transfer station functioning as the transfer master stops and the control process stops, there will be no problem with the transfer system that does not need to perform transfer processing, but when it is necessary to continue the control operation, it will appear as a transfer The disadvantage of the transmission station acting as the master station must be borne by other transmission stations as the transmission master station

[0008] In addition, in the invention described in Patent Document 3, when a power failure occurs and an abnormality occurs in the transmission station functioning as the transmission master station, the response is limited to the response to the abnormality caused by the power failure, and cannot Take countermeasures against abnormal occurrences of the transfer master station due to other causes

In addition, in the elevator group management control, the premise is to use a microcomputer to control the system, so the software (software) is used to control the switching of the transmission station. Depending on the implementation of other functions, there is a risk that the control operation will become unstable.

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