Redundant Ethernet Backplane for Fault-Tolerant Modular I/O
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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 operate independently, ensuring continuous operation even if one backplane fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single backplane data path is used in distributed modular I/O systems, then device complexity is reduced, but fault tolerance deteriorates due to single-point failures
Solution Approach 1:
The backplane network is segmented into two independent Ethernet networks (first and second Ethernet backplane networks), each capable of carrying data traffic separately. This segmentation allows the system to tolerate failures in one network while the other continues to operate, directly resolving the contradiction by improving fault tolerance through structural division.
Solution Approach 2:
The system implements redundant backplane networks and switches in advance to cushion against potential failures. By having pre-configured backup paths and components, the system can withstand single-point failures without disruption, resolving the contradiction between reliability and complexity by accepting controlled complexity to eliminate single points of failure.
2Reliability
If redundant dual Ethernet backplane networks are implemented, then fault tolerance is improved, but device complexity increases
Solution Approach 1:
Each Ethernet switch in the backplane is configured to handle both first and second Ethernet network traffic simultaneously. This multi-functionality allows the same physical infrastructure to support redundant logical networks, reducing the actual complexity increase while maintaining fault tolerance benefits.
Solution Approach 2:
The patent introduces redundancy in the logical network dimension rather than requiring additional physical backplane layers. By creating parallel logical Ethernet networks over the same physical backplane infrastructure, the system achieves fault tolerance without proportionally increasing physical complexity.
3Reliability
If a single backplane network is used, then ease of operation is maintained, but availability deteriorates due to service interruptions during component replacement
Solution Approach 1:
The redundant backplane network configuration provides a pre-established backup path that is ready to immediately take over traffic when a component needs replacement. This beforehand cushioning enables hot-swapping of network adapters and I/O devices without service interruption, resolving the contradiction by improving availability while maintaining ease of operation through seamless failover.
Solution Approach 2:
The system maintains continuous data flow through automatic failover between redundant backplane networks when components are replaced or fail. The load balancing and traffic redirection mechanisms ensure that useful action (data communication) continues uninterrupted, resolving the contradiction between availability and ease of operation during maintenance activities.
4Productivity
If load balancing is implemented across redundant networks, then productivity is improved through continuous operation, but device complexity increases
Solution Approach 1:
The Ethernet switches in the backplane automatically perform load balancing and failover operations without requiring external intervention or complex manual configuration. The system self-manages traffic distribution across redundant networks and automatically redirects traffic upon detecting failures, resolving the contradiction by improving productivity through continuous operation while minimizing the operational complexity burden on users.
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.