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

Abstract

Abstract Description of the Proposed Paper: Deepwater BOP Control Systems are typically a Multiplexed Electro-Hydraulic (MUX) System for water depths greater than 5,000 ft. There are currently two dominate hardware philosophies in the industry; Embedded Computers (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/PC Hybrid Systems. Application: There are several different EC based and Hybrid PC/PLC based OEM systems in the market today, each somewhat different. Each must be evaluated individually, based on its unique hardware and software design and implementation. Information in this paper will explain the system architecture and philosophy of the EC based system and gives a comparison with Hybrid PC/PLC based systems. This system information can be used by interested parties to perform a more detailed comparison of other OEM systems. Results, Observations, and Conclusions: It has been found beneficial to use components that comply with MIL Specifications whenever possible. The electronics which are not purchased are designed in-house and built to IPC Class 3 requirements (Electronics for Life Support and Safety Critical Systems). This strategy gives maximum reliability and allows flexibility in form factor to develop optimal subsea electronic packaging. The EC system allows programming in an object oriented language which allows creating software objects once and 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 solenoid control, status readback, and diagnostic capabilities when using Fiber Optic Communication. The EC type system also allows for more robust and flexible communications options than other types of system architecture. Significance of Subject Matter What makes a system reliable is the complete understanding and control of the hardware/firmware/software design, manufacturing process, and testing procedures.