Redundant Fieldbus Network with Automatic Fault Segmentation
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Solution Overview
Problem
Fieldbus networks lack inherent redundancy, leading to potential downtime and increased costs due to reliance on a single power cable, which can cause loss of control and communication with field devices in case of a fault.
Innovation Solution
Implementing a redundant fieldbus network with independent power supply paths and fault detection circuits that automatically switch to backup systems, ensuring continuous operation by decoupling faulty power paths and maintaining signal integrity through automatic termination and hot swapping of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power cable is used to connect field devices to the host system, then the device complexity is reduced and installation is simplified, but the reliability of the fieldbus network deteriorates because any cable fault causes complete network failure
Solution Approach 1:
The network cable is segmented into multiple independent sections with individual terminators at each segment. When a fault occurs in one segment, only that segment is affected and can be isolated, while other segments continue to operate. This segmentation transforms a single point of failure into multiple independent operational units, resolving the contradiction between simplified installation and network reliability.
Solution Approach 2:
Redundant terminator circuits are pre-installed at both ends of each cable segment before faults occur. These terminators are designed to automatically activate when a fault is detected, providing immediate protection and maintaining network integrity without requiring manual intervention. This beforehand preparation ensures that the network can withstand cable faults while maintaining relatively simple installation procedures.
2Reliability
If redundant power supply paths with independent cables are implemented, then the reliability and fault tolerance of the fieldbus network are improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The redundant cable system is divided into modular segments with standardized terminators at each end. Each segment can be independently installed, tested, and replaced. This modular segmentation reduces the overall complexity of managing redundant cables by breaking down the complex routing into manageable, standardized units that can be handled individually.
Solution Approach 2:
The patent creates identical copies of terminator circuits at both ends of each cable segment. These duplicate terminators ensure that regardless of which cable or segment is faulty, the network maintains its termination integrity through the copied components. This copying approach provides reliability without requiring complex custom-designed redundant systems.
3Loss of time
If automatic fault detection and switching systems are implemented, then the duration of network interruption is reduced and continuous operation is maintained, but the device complexity and cost increase
Solution Approach 1:
The terminator circuits are designed with automatic fault detection and switching capabilities that operate without external control or manual intervention. When a cable fault is detected, the terminator automatically activates the backup termination path, maintaining network operation. This self-service mechanism reduces downtime without requiring complex centralized control systems or additional switching hardware.
Solution Approach 2:
The terminator circuits incorporate feedback mechanisms that continuously monitor cable integrity and automatically adjust their state based on detected faults. This feedback loop enables rapid response to failures, minimizing network interruption time while using relatively simple circuitry rather than complex control systems.
4Reliability
If terminators are placed at both ends of each cable segment, then signal integrity and network reliability are improved, but the quantity of components and installation complexity increase
Solution Approach 1:
The terminator circuits are designed to perform multiple functions: normal signal termination, fault detection, automatic switching, and network segmentation. By making each terminator multi-functional, the patent reduces the need for separate components for each function, thereby improving signal integrity and reliability without proportionally increasing the quantity of components or installation complexity.
Solution Approach 2:
Placing terminators at both ends of each segment creates independently functional network sections. This segmentation allows the network to be divided into manageable units where each terminator serves its local segment effectively. The modular nature of segmented terminators reduces overall system complexity compared to attempting to manage a single large network without segmentation.
Data Source
AI summary
A redundant fieldbus redundant system includes two independent conditioned power modules which automatically detect cable faults, such as short or open circuits on both the host and field sides of the network. The power modules are interfaced directly on one side to the primary and backup H1 cards of the host system, and are directly interfaced on the other side to an automatically terminating network device coupler module which provides connections to field devices. The redundant fieldbus system provides power and communications in a parallel physical configuration between the host system and the field devices irrespective of any single point failure in the network. In case of a fault, the redundant fieldbus system automatically eliminates the faulty section of the network, switches power and communications to the healthy portion of the network and terminates the network for signal integrity.