Modular I/O Backplane With Dual Ethernet Redundancy
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Solution Overview
Problem
Existing distributed modular I/O systems in industrial automation lack true fault tolerance due to single-point failures in their backplane data paths, which can disrupt operations in critical applications requiring continuous process control.
Innovation Solution
The implementation of a redundant dual Ethernet backplane network with independent data circuits and switches, allowing each adapter and I/O module to connect to multiple networks and maintain operation even if one backplane fails, ensuring continuous data flow and power through parallel connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single backplane data path is used to connect network adapter and I/O modules, then the system structure is simple and cost-effective, but the system lacks fault tolerance and operational continuity when a single-point failure occurs
Solution Approach 1:
The backplane data path is segmented into two independent parallel paths (first backplane data path and second backplane data path), each capable of carrying data traffic separately. This segmentation allows the system to isolate failures to one path while maintaining operational capability through the other path, thereby improving fault tolerance without requiring complete system redundancy.
Solution Approach 2:
The system transitions from a single-dimensional data path to a two-dimensional redundant architecture by implementing parallel backplane paths. This dimensional expansion creates redundancy in the data transmission medium, allowing traffic to be routed through alternative paths when one path fails, thus enhancing system reliability.
2Reliability
If redundant dual Ethernet backplane networks are implemented with independent data circuits and switches, then fault tolerance and operational continuity are improved, but system complexity and component quantity increase
Solution Approach 1:
The first and second network switches are merged into a single physical device with dual Ethernet backplane interfaces, allowing both redundant data paths to terminate at the same switch component. This merging reduces the total number of discrete switch components while maintaining the redundancy benefits of dual independent data paths, thereby improving operational continuity without proportionally increasing device complexity.
Solution Approach 2:
The network switch is designed with multi-functionality to handle both first and second backplane data paths simultaneously, serving multiple functions (managing redundant Ethernet connections, routing data traffic across different paths, and providing unified network access) through a single device. This universality reduces component quantity while maintaining system reliability.
Data Source
AI summary
A modular I/O system for an industrial automation network includes a network adapter including first and second adapter modules, wherein each adapter module is configured for connection with an industrial network. The I/O system further includes a first I/O device with first and second I/O modules each configured for operative connection to a controlled system for input/output of data with respect to the controlled system. The I/O system further includes first and second independent backplane data networks that connect each of the first and second adapter modules to each of the first and second I/O modules. The network adapter includes first and second removable backplane network switches and the first I/O device includes third and fourth removable backplane network switches that establish the backplane networks. The backplane network switches can be Ethernet gigabit switches.