Duplex field bus system

Details Duplex field bus system Duplex field bus system

1992-03-30

1995-05-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, 370 16, 340827, 371 81, H04B 156

Patent

active

054126436

ABSTRACT:
A duplex field bus system in which a transmission is provided by first and second transmission lines. At least one of field device, an upper-rank apparatus and an external power supply is connected to both of the first and second transmission lines so that power supply and communication can be performed by using either one of or both of the transmission lines selectively. When failure is detected in the currently used one of the first and second transmission lines, not only is the failed transmission line switched over into the other one transmission line, but also information related to the occurrence of failure is transmitted to other devices before the communication is restarted. Accordingly, even in the case where fatal failure related to the transmission line occurs in the field bus system, communication can be continued by automatically switching the transmission line used by the devices.

REFERENCES:
patent: 5027347 (1991-06-01), Malkki
patent: 5153874 (1992-10-01), Kohno
patent: 5163041 (1992-11-01), Moriyama
patent: 5200949 (1993-04-01), Kobayashi

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