Multiplex communication system for sequence controllers

Details Multiplex communication system for sequence controllers Multiplex communication system for sequence controllers

H - Electricity

04

J

340/94

H04J 3/02 (2006.01) G05B 19/04 (2006.01) H04J 3/14 (2006.01) H04L 12/437 (2006.01)

Patent

CA 1331647

ABSTRACT OF THE DISCLOSURE Among systems configured by connecting a plurality of sequence controllers to one communication line to intercommunicate, many systems have been disclosed which implement fault location and recovery from the faults. In one of these systems, each sub- station is connected to a circulating communication line via a branch line and switches are respectively disposed in the branch line and in the communication line at both sides of a connecting point of the branch line and the communication line. Further, the communication line can be formed in a loop by a spare line. In another of these systems, an integrated portion of the communic- ation line is formed near the master station, and the communication line is connected to the master station and is configured of one continuous line which goes back and forth in sequence between the integrated portion and the vicinity of each substation. In that integrated portion, a switch is disposed in each one of two lines, which connect the integrated portion and each substation. Further, a switch is provided in a line which bypasses these two switches. Other systems are a composite of the above systems. Still other systems have automated portions of fault location and fault recovery.

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