Coordinate Measurement Control With Asynchronous Error Recovery
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Solution Overview
Problem
In coordinate measurement systems, errors during operations in NC machine tools are challenging to detect and manage, especially when the terminal device and NC controller operate asynchronously, leading to potential continuous operation despite errors and requiring effective error recovery mechanisms.
Innovation Solution
A measurement system with a control device that generates commands for a measurement device, allowing for error detection and recovery by writing commands and results to a command storage region, enabling asynchronous operation management and efficient error handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If error checking is conducted on the terminal device side when using an all-purpose device that mimics an NC machine tool, then the system can operate flexibly, but the terminal device and NC controller operate asynchronously causing the NC machine tool to continue operating even when an error is detected
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device continuously monitors the operational status of the NC controller and sends feedback signals. When an error is detected on the terminal device side, the system uses pre-stored recovery commands in the command storage region to automatically recover the NC controller, ensuring synchronous error handling despite the asynchronous operation architecture.
Solution Approach 2:
The patent stores recovery commands in advance in the command storage region of the NC controller. When an error occurs, these pre-prepared commands are immediately executed without requiring complex real-time decision-making, enabling rapid error recovery and maintaining system reliability while preserving operational flexibility.
2Productivity
If the NC machine tool continues to operate after error detection on the terminal device side, then operational continuity is maintained, but error recovery becomes necessary and complex
Solution Approach 1:
Recovery commands are prepared and stored in advance in the command storage region for various error conditions. When an error occurs, the terminal device identifies the appropriate pre-stored command and transmits it to the NC controller, enabling automatic recovery without complex real-time programming or manual intervention, thus maintaining productivity while simplifying the recovery process.
3Adaptability or versatility
If asynchronous operation between terminal device and NC controller is implemented, then system flexibility is improved, but error synchronization and coordination become difficult
Solution Approach 1:
The patent establishes a feedback communication channel between the terminal device and NC controller that continuously exchanges status information. This feedback mechanism allows the terminal device to detect errors asynchronously while maintaining synchronization through regular status updates and acknowledgment signals, resolving the coordination difficulty without sacrificing system flexibility.
Data Source
AI summary
A measurement system includes a measuring instrument having coordinate measurement capabilities, and a control device generating a command for controlling operation of the measuring instrument. The measuring instrument includes an NC controller executing an operation that is based on a command stored in a command storage that can be browsed by the measuring instrument, and writing a result of the executed operation to the command storage. The control device includes an NC driver writing the command to the command storage, and writing information contingent on the command and on the result of the operation by the measuring instrument to the command storage.