Multi-Servo History Logging With Autonomous Time-Axis Alignment
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Solution Overview
Problem
Conventional servo systems struggle to align the time axes of history data from multiple servo amplifiers when the host apparatus lacks the functionality to issue instructions to stop saving servo computation information.
Innovation Solution
The proposed servo system and control method utilize a communication unit in the host apparatus to transmit communication commands that include save start and stop instructions, allowing the servo amplifiers to synchronize their history data saving processes even without explicit stop instructions from the host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the host apparatus lacks the function to issue instructions to stop saving history data, then the system is more adaptable to different host apparatuses, but the time axes of history data from multiple servo amplifiers cannot be aligned
Solution Approach 1:
Each servo amplifier autonomously monitors its own save stop flag and detects when all servo amplifiers have finished saving history data. The system uses self-service mechanisms where servo amplifiers independently determine when to stop saving based on internal flag monitoring, eliminating the need for host apparatus control while achieving precise time axis alignment.
Solution Approach 2:
The system implements feedback through save stop flags that are monitored by each servo amplifier. When a servo amplifier finishes saving history data, it sets its save stop flag, and other servo amplifiers detect this flag to coordinate their saving operations. This feedback mechanism ensures all servo amplifiers align their time axes without requiring host apparatus intervention.
2Manufacturing precision
If the host apparatus issues instructions to stop saving history data, then the time axes of history data can be aligned, but the system requires a specific host apparatus function that reduces adaptability
Solution Approach 1:
The invention extracts the time axis alignment function from the host apparatus and relocates it to the servo amplifiers themselves. By removing the dependency on host apparatus control and implementing autonomous flag monitoring within each servo amplifier, the system achieves precise alignment while being compatible with any host apparatus regardless of its saving control capabilities.
3Loss of information
If servo amplifiers continuously save history data, then data availability is improved, but storage space is wasted when data is not needed
Solution Approach 1:
The system implements periodic saving action controlled by save start and save stop flags. Instead of continuous saving, history data is saved periodically when the save start flag is set and stopped when the save stop flag is set. This periodic operation ensures data is available when needed while preventing unnecessary consumption of memory storage space during periods when data collection is not required.
Data Source
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AI summary
This servo system is a servo system in which a host apparatus and a plurality of servo amplifiers transmit and receive a communication signal. Each of the servo amplifiers includes a servo computation unit configured to perform servo computation processing, a communication unit configured to transmit and receive the communication signal, a storage unit configured to save servo computation information in the servo computation processing as history data, and a trigger information processor configured to set, in advance, a save stop condition for stopping saving the history data, determine, for each servo computation period, whether the save stop condition is matched, and notify, when the save stop condition is matched, the communication unit of a determination result indicating detection of a trigger as a trigger detection flag.