BOP MUX Control System: Comparing Embedded Computer Based Versus PLC Hybrid System for Maximum Reliability

摘要

Description of the Proposed PaperDeepwater BOP Control Systems are typically a Multiplexed Electro-Hydraulic (MUX) System for water depthsgreater than 5,000 ft. There are currently two dominate hardware philosophies in the industry; EmbeddedComputers (EC) and Hybrid Personal Computer (PC) and Programmed Logic Controllers (PLC) based systems.This paper presents Oceaneering International’s Embedded Computer technology, and compares it to PLC/PCHybrid Systems.ApplicationThere are several different EC based and Hybrid PC/PLC based OEM systems in the market today, eachsomewhat different. Each must be evaluated individually, based on its unique hardware and software design andimplementation. Information in this paper will explain the system architecture and philosophy of the EC basedsystem and gives a comparison with Hybrid PC/PLC based systems. This system information can be used byinterested parties to perform a more detailed comparison of other OEM systems.Results, Observations, and ConclusionsIt has been found beneficial to use components that comply with MIL Specifications whenever possible. Theelectronics which are not purchased are designed in-house and built to IPC Class 3 requirements (Electronics forLife Support and Safety Critical Systems).This strategy gives maximum reliability and allows flexibility in form factor to develop optimal subsea electronicpackaging.The EC system allows programming in an object oriented language which allows creating software objects onceand reuse them in many places without copying the code.An EC based system has high data rates between surface and subsea for very high bandwidth for solenoidcontrol, status readback, and diagnostic capabilities when using Fiber Optic Communication. The EC type systemalso allows for more robust and flexible communications options than other types of system architecture.Significance of Subject MatterWhat makes a system reliable is the complete understanding and control of the hardware/firmware/softwaredesign, manufacturing process, and testing procedures.