October 2006

Process Control/Information Systems

Fieldbus enables single-loop integrity with control-in-the-field

Benefits include device and process health monitoring that enable establishing asset management and predictive maintenance practices

Bu Yu, H., SINOPEC Engineering Inc.; Peluso, M., Emerson Process Management

Single-loop integrity is the "good engineering practice" of designing process control loops (or control strategies) in such a way that if any element (e.g., transmitter, wire, power supply, controller, control valve, etc.) fails, there is minimal impact on production. Prior to the introduction of DCSs and PLCs single-loop integrity was a widely used good engineering practice in process plants around the globe and some end-users on the ISA SP50 digital fieldbus committee felt strongly about it. The vision of those forward-thinking committee members is now achievable using Foundation fieldbus (FF) function blocks to implement control-in-the-field (CIF). What makes CIF far better than its

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