Networked Safety Motor Control Center Without Relay Cabinets
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Solution Overview
Problem
Conventional industrial control systems in the oil and gas industry rely on interposing relay cabinets for signal interfacing between motor control centers and safety instrumented systems, leading to increased complexity, cost, and potential hardware failure risks, which can compromise fault tolerance and redundancy.
Innovation Solution
The implementation of an intelligent safety motor control center (ISMCC) that eliminates the need for interposing relay cabinets by directly interfacing with the safety instrumented system through network interfaces, utilizing redundant communication paths and machine learning algorithms to predict device performance and ensure real-time monitoring and control, while meeting Safety Integrity Level (SIL) 3 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interposing relay cabinets are used for signal interfacing between motor control centers and safety instrumented systems, then signal transmission and control functions are achieved, but system complexity increases, cost increases, and hardware failure risks increase
Solution Approach 1:
The patent removes the interposing relay cabinet from the system architecture, allowing motor control centers to communicate directly with the safety instrumented system through network interfaces. This extraction of the intermediary component eliminates the associated complexity and potential failure points while maintaining the essential signal transmission function through digital communication protocols.
Solution Approach 2:
The patent replaces the mechanical/electrical relay-based signal interfacing system with a digital network communication system. Instead of using physical relay cabinets with electrical connections, the system uses network interfaces and digital communication protocols to achieve the same control and monitoring functions, thereby reducing hardware complexity and failure risks.
2Reliability
If interposing relay cabinets are used for signal interfacing, then signal transmission is achieved, but system cost increases
Solution Approach 1:
The patent eliminates the need for separate relay cabinet hardware, reducing material costs, installation costs, and maintenance costs. The extraction of this intermediary component simplifies the overall system architecture while maintaining safety control functionality through direct network communication between motor control centers and the safety instrumented system.
3Device complexity
If relay cabinets are eliminated and direct network interfacing is used, then system complexity is reduced and cost is reduced, but communication reliability must be maintained
Solution Approach 1:
The patent changes the communication parameters and protocols used in the network interface to ensure reliable data transmission. By implementing appropriate communication protocols, error checking mechanisms, and data validation procedures, the system maintains high communication reliability despite the elimination of physical relay cabinets, thereby resolving the contradiction between reduced complexity and maintained reliability.
Data Source
AI summary
Some implementations provides a system to implement a safety control at an oil and gas facility, the system comprising: one or more motor control centers, each comprising a network interface, and a programmable logic controller (PLC), wherein each motor control center is configured to monitor and control one or more field devices coupled thereto, and wherein a plurality of field devices are dispersed at the oil and gas facility; and a safety instrumented system (SIS) in communication with the one or more motor control centers through the network interface thereof, wherein each motor control center is configured to communicate with the SIS without an interposing relay, and wherein the SIS comprises control elements configured to implement the safety control at the oil and gas facility based on communication with each motor control center through the network interface thereof.