Dual-System Clock Signal Inspection for Online Plant Monitoring
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Solution Overview
Problem
Conventional clock signal inspection devices struggle to diagnose the soundness of the clock signal and the inspection device itself online without stopping the arithmetic processing unit, which is crucial for maintaining high safety and reliability in plant monitoring controllers like those for turbine generators.
Innovation Solution
A clock signal inspection device comprising two systems with counters, comparison counters, comparators, and output circuits that compare count values of clock signals, allowing for online diagnosis without stopping the arithmetic processing unit by changing count times and comparing values to determine soundness, enabling individual diagnosis of each system and preventing communication circuit stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional clock signal inspection device outputs an error signal when abnormality is detected, then the clock signal soundness is monitored, but all functions of the arithmetic processing unit stop, making it difficult to confirm the inspection device itself is operating normally
Solution Approach 1:
The inspection device is divided into two independent systems (System A and System B), each capable of independently inspecting clock signals. This segmentation allows one system to perform inspection while the other performs self-diagnosis or remains as backup, resolving the contradiction by enabling continuous operation without complete stoppage when performing diagnostic functions.
Solution Approach 2:
The invention changes the operational parameters of the inspection device by introducing a dual-system architecture where each system can operate independently. This parameter change enables the device to switch between inspection mode and self-diagnosis mode without stopping the arithmetic processing unit, as one system can continue monitoring while the other undergoes diagnosis.
2Measurement precision
If the arithmetic processing unit is stopped to perform self-diagnosis of the inspection device, then the inspection device functionality can be confirmed, but plant monitoring operations are interrupted
Solution Approach 1:
By segmenting the inspection device into two independent systems, the invention enables one system to perform self-diagnosis while the other continues monitoring clock signals for plant operations. This eliminates the need to stop the arithmetic processing unit for diagnosis, maintaining plant monitoring productivity while still enabling verification of inspection device soundness.
Solution Approach 2:
The dual-system architecture ensures continuous useful action by allowing one inspection system to remain operational while the other undergoes self-diagnosis. This continuity prevents interruption of plant monitoring operations, resolving the contradiction between verification precision and operational productivity.
3Reliability
If multiple control systems and monitoring systems are multiplied to ensure high safety and reliability, then plant safety is improved, but the complexity of the overall system increases
Solution Approach 1:
The invention merges the functions of multiple inspection devices into a single dual-system inspection device. Each system within the device can independently perform inspection and self-diagnosis, providing the reliability of multiple systems while reducing overall complexity by integrating them into one unified structure with shared components.
Data Source
AI summary
It is an object to provide a plant monitoring controller that is used as a plant monitoring controller and that can confirm the soundness of a clock signal serving as a reference for operation of each function unit and can diagnose the soundness of a clock signal inspection device itself, thereby having high reliability based on an accurate clock signal.By using two clock signals having the same frequency, soundness of the respective clocks is diagnosed in two clock signal inspection circuits, and during normal operation of one system, a clock error is caused to occur in the other system in a pseudo manner and detection operation of the clock signal inspection circuit is confirmed, whereby online diagnosis of the clock signal inspection device itself is enabled.