Redundant Input Module Impedance Switching for High Availability
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Solution Overview
Problem
Existing high availability systems with redundant input modules face challenges in maintaining consistent electrical conditions, such as line impedance, when one module becomes unavailable, leading to potential system downtime and inefficiencies.
Innovation Solution
Implementing redundant input modules with integrated resistors and switches that automatically adjust impedance based on module presence, ensuring consistent electrical conditions without requiring field wiring changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant input modules are used to ensure system availability, then system reliability is improved, but maintaining consistent electrical conditions (line impedance) becomes difficult when one module becomes unavailable
Solution Approach 1:
The patent implements dynamic impedance adjustment by detecting the operational status of redundant input modules and automatically modifying the impedance of remaining modules. When one module becomes unavailable, the system dynamically changes the electrical characteristics of the remaining modules to maintain the expected total line impedance, resolving the contradiction between redundancy and electrical stability.
2Stability of the object's composition
If manual field wiring changes are implemented to maintain impedance, then electrical conditions are maintained, but system downtime and operational complexity increase
Solution Approach 1:
The patent enables the system to automatically maintain proper line impedance without requiring manual field wiring changes. The input modules self-adjust their impedance based on the operational status of redundant modules, eliminating the need for technician intervention and reducing system downtime while maintaining electrical conditions.
3Stability of the object's composition
If impedance adjustment mechanisms are added to maintain electrical conditions, then line impedance stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the impedance adjustment functionality directly within the existing input module architecture. By integrating the impedance adjustment mechanism into the module itself rather than adding separate external components, the system maintains impedance stability while minimizing additional complexity.
Data Source
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AI summary
An input module may include a first resistor and a second resistor coupled in series with the first resistor. The input module may also include a switch that may electrically isolate the second resistor based on a voltage output by an additional input module electrically coupled to the input module via a terminal base.