US 2007/0185588 A1Published application

Redundant fieldbus system

AssigneeMoore Industries International, Inc.

InventorHassan El-Sayed

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Abstract

A redundant fieldbus redundant system includes two independent conditioned power modules which automatically detect cable faults, such as short or open circuits on both the host and field sides of the network. The power modules are interfaced directly on one side to the primary and backup H1 cards of the host system, and are directly interfaced on the other side to an automatically terminating network device coupler module which provides connections to field devices. The redundant fieldbus system provides power and communications in a parallel physical configuration between the host system and the field devices irrespective of any single point failure in the network. In case of a fault, the redundant fieldbus system automatically eliminates the faulty section of the network, switches power and communications to the healthy portion of the network and terminates the network for signal integrity.

Claims16

Dependent claims

A fieldbus network, comprising:

a first power supply providing independent host and field power supply paths to a host side terminal and to a field side terminal, respectively, the first power supply having a first fault detector circuit coupled to host and field switches adapted to selectively decouple the host and field power supply paths in response to detection of a fault on host and field sides, respectively;
a second power supply providing independent host and field power supply paths to a host side terminal and a field side terminal, respectively, the second power supply having a second fault detector circuit coupled to host and field switches adapted to selectively decouple the host and field power supply paths in response detection of a fault on host and field sides, respectively;
and
first and second fieldbus cables coupled in parallel to a field device, the first fieldbus cable coupled between the field side terminal of the first power supply and the field device and the second fieldbus cable coupled between the field side terminal of the second power supply and the field device.

1 more element

Dependencies are inferred from the claim text.