Process control system with improved fault isolation

Details Process control system with improved fault isolation Process control system with improved fault isolation

G - Physics

06

F

354/230.3

G06F 11/22 (2006.01) G05B 23/02 (2006.01) H05K 7/14 (2006.01)

Patent

CA 1188005

Abstract A process control system includes redundant digital controllers and a plurality of input/output (I/O) modules for interfacing with remote field sensors and actuators. Bi-directional communication between con- trollers and I/O modules is achieved by a parallel- wired, process I/O bus. Failures within the system, including the bus structure itself, that continually keep the bus active (i.e., in a low state) are isolated by a combination of software diagnostic routines for performing bus checkout and a unique quick disconnect feature that readily isolates the fault condition first between the I/O module nest area and the controllers, then, if necessary, to individual I/O modules. During fault isolation procedures, individual I/O modules may be disconnected from the bus while the values of field signals are simultaneously maintained to provide mini- mum process upset.

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