Patent ID: 7505819
Filing Date: 2009-03-17
Classification: G05B

Abstract:
1. A fieldbus network, comprising: a first power supply module comprising a first power supply and host and field power supply paths coupling the first power supply to a host side terminal and to a field side terminal of the first power supply module, respectively, the first power supply module having a first fault detector circuit coupled to a host switch coupled along the host power supply path between the first power supply and the host side terminal and to a field switch coupled along the field power supply path between the first power supply and the field side terminal, the host switch adapted to decouple the first power supply from the host terminal in response to detection of a fault on the host side and the field switch adapted to decouple the first power supply from the field side terminal in response to detection of a fault on the field side; a second power supply module comprising a second power supply and host and field power supply paths coupling the second power supply to a host side terminal and to a field side terminal of the second power supply module, respectively, the second power supply module having a second fault detector circuit coupled to a host switch coupled along the host power supply path between the second power supply and the host side terminal and to a field switch coupled along the field power supply path between the second power supply and the field side terminal, the host switch adapted to decouple the second power supply from the host terminal in response to detection of a fault on the host side and the field switch adapted to decouple the second power supply from the field side terminal in response to detection of a fault on the field side; 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.