Duplex IO Module Handoff for Seamless Redundant Load Transfer
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Solution Overview
Problem
Industrial automation systems face challenges in maintaining high availability and reliability, particularly in petrochemical applications, where downtime is not acceptable, and existing systems struggle with coordinated handoffs between redundant IO modules, leading to potential operational disruptions and signal transients during switching.
Innovation Solution
The implementation of concurrently and redundantly operating IO modules with universal IO circuitry, allowing for coordinated handoffs between primary and secondary modules, ensuring seamless power and signal transfer without interruptions, and enabling diagnostic operations to verify the secondary module's capability to handle the load in case of primary module failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant IO modules are used for high availability, then system reliability improves, but coordinated handoff between modules becomes complex and may cause operational disruptions
Solution Approach 1:
The system performs preliminary actions by pre-configuring the secondary IO module with load information and testing its capability to handle the load before a failover event occurs. This includes pre-establishing communication channels and verifying operational readiness, so that when handoff is needed, the transition is seamless and requires minimal complex coordination during the actual switch.
Solution Approach 2:
A control system acts as an intermediary between the primary and secondary IO modules, managing the handoff process. The control system coordinates the transition by sending commands to both modules, ensuring proper state transfer, and monitoring the handoff completion. This intermediary simplifies the complexity by centralizing the coordination logic rather than requiring direct complex interaction between the redundant modules.
2Reliability
If redundant IO modules are used for high availability, then system reliability improves, but signal transients and operational disruptions may occur during switching
Solution Approach 1:
Before the actual handoff occurs, the system performs preliminary testing of the secondary module's capability to handle the load. This includes verifying signal compatibility and operational readiness, ensuring that when the switch occurs, signal transients are minimized because the secondary module is already prepared and configured to accept the load without disruption.
Solution Approach 2:
The system maintains continuous useful action during the handoff process by ensuring the secondary IO module remains in a ready state with proper configuration loaded, so that the transition from primary to secondary module is seamless. The control system manages the switch in a way that maintains continuous operation, preventing signal transients by ensuring the secondary module is already configured and ready to immediately assume the load without interruption or signal disruption.
3Difficulty of detecting and measuring
If the secondary IO module is tested before handoff, then diagnostic capabilities improve, but system complexity and operational time increase
Solution Approach 1:
The system performs a focused, partial diagnostic test on the secondary IO module's capability to handle the load, rather than a complete comprehensive test. This targeted approach verifies the critical failover functionality without requiring extensive testing of all module features, thus improving diagnostic capability while minimizing the time and operational disruption required for the test.
Data Source
AI summary
Embodiments of this present disclosure may include a system that may include a first input/output (IO) module, which may output a first current output. The first IO module may be coupled to a first terminal and a second terminal. The system may include a second IO module that may output a second current output. The second IO module may be coupled to the first terminal and the second terminal. The system may include a load device coupled to the first terminal and the second terminal. The load device may operate based on the first current output and the second current output. The system may include one or more control systems that receive an instruction to perform a coordinated handoff to the first IO module.