Multi-Input Switching Assembly With Event-Triggered Diagnostics
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Solution Overview
Problem
In automation devices, monitoring multiple signal inputs within safety circuits for high integrity levels requires extensive diagnostic effort, especially in discrete relay circuits, leading to increased complexity and resource utilization.
Innovation Solution
A circuit arrangement featuring a diagnostic module, a start module, and an AND assembly with an optocoupler, which activates the diagnostic module upon detecting a falling signal input, allowing for efficient error analysis and using a capacitor as an energy store to facilitate the diagnostic process, ensuring reliable and inexpensive components are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety circuit monitors multiple signal inputs using discrete relay circuits with relay contacts for plausibility diagnosis, then the diagnostic capability is improved, but the device complexity and resource utilization increase greatly
Solution Approach 1:
The patent combines multiple monitoring functions into a single integrated circuit arrangement. The start module aggregates signals from multiple signal inputs (112a-c) and feeds them to a single diagnostic module, eliminating the need for separate relay circuits for each input. This merging reduces device complexity while maintaining diagnostic capability for all inputs.
Solution Approach 2:
The diagnostic module serves as a universal component that can diagnose multiple signal inputs through the start module's signal aggregation. Instead of having dedicated diagnostic circuits for each input, one diagnostic module handles all inputs, reducing overall system complexity while preserving comprehensive diagnostic coverage.
2Measurement precision
If the diagnostic module is continuously activated to monitor all signal inputs, then the diagnostic precision is improved, but the energy consumption increases
Solution Approach 1:
The diagnostic module is activated periodically or event-driven rather than continuously. The start module detects changes in signal inputs and triggers the diagnostic module only when necessary. This periodic activation maintains diagnostic precision for all inputs while significantly reducing energy consumption compared to continuous monitoring.
3Reliability
If multiple relay contacts are used for plausibility diagnosis of each signal input, then the reliability of error evaluation is improved, but the quantity of components increases
Solution Approach 1:
The patent merges the function of multiple relay contacts into integrated electronic components. The start module and diagnostic module together replace what would traditionally require multiple relay contacts for plausibility diagnosis. This consolidation maintains error evaluation reliability while dramatically reducing the quantity of individual components needed.
4Ease of manufacture
If the circuit arrangement uses readily available components such as optocouplers and capacitors, then the ease of manufacture is improved, but the diagnostic sophistication may be reduced
Solution Approach 1:
The patent replaces complex mechanical relay systems with electronic components like optocouplers and capacitors. The optocoupler provides electrical isolation and signal transmission, while the capacitor enables energy storage and release for diagnostic operations. These readily available electronic components simplify manufacturing while maintaining sufficient diagnostic sophistication through clever circuit design rather than component complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies the monitoring of multiple signal inputs by activating the diagnostic module only when necessary, utilizing readily available and reliable components, and preventing accidental reactivation of the circuit, thereby enhancing operational safety and reducing diagnostic effort.
Implementation Method 1
the switching element has an optocoupler
Implementation Method 2
the energy store is a capacitor
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a circuit arrangement (100) for monitoring a plurality of signal inputs (112a - 112c). According to the invention, a diagnostic module (104) and a start module (106) are provided, wherein the start module (106) is configured to generate a start signal (S) upon detection of a deactivated input signal at one of the signal inputs (112a - 112c) by the circuit arrangement (100), the start module (106) is connected to the diagnostic module (104) in such a way as to transmit the start signal (S) to the diagnostic module (104), and the diagnostic module (104) can be activated upon detection of the start signal (S).