Industrial Network Apparatus Priority Transmission Cycle Management
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Solution Overview
Problem
Industrial networks face challenges in maintaining real-time data transmission accuracy and synchronization in motion control systems, as irregular message transmissions can disrupt the cyclic exchange of control data and affect the transmission cycle, leading to potential disturbances in device operation.
Innovation Solution
The industrial network apparatus employs a control data communicator for priority transmission and a message data communicator that determines whether to transmit message data based on required transmission time and remaining time in non-priority periods, using cut-through and store-and-forward methods respectively, to ensure accurate and synchronized data exchange without affecting the transmission cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If message transmission is executed during the transmission cycle, then maintenance and engineering tasks can be performed, but the real-time property of control data exchange is compromised and transmission cycle accuracy deteriorates
Solution Approach 1:
The transmission cycle is segmented into a priority transmission period for control data exchange and a non-priority transmission period for message transmission. This temporal segmentation ensures that real-time control data maintains its transmission cycle accuracy while message transmission opportunities are provided for maintenance and engineering tasks without compromising real-time property.
2Adaptability or versatility
If message transmission is executed during the transmission cycle, then data exchange flexibility is improved, but the transmission cycle accuracy is expanded and synchronization is disturbed
Solution Approach 1:
The transmission cycle is divided into priority and non-priority periods, isolating message transmission from the critical real-time control data exchange period. This ensures transmission cycle accuracy is maintained for control data while flexibility is provided for message transmission.
Solution Approach 2:
The non-priority transmission period acts as an intermediary time slot that accommodates message transmission without interfering with the priority transmission period. This intermediary structure allows flexible data exchange while preserving the accuracy of the main transmission cycle.
3Speed
If control data is transmitted with high priority, then real-time response is improved, but bandwidth for message transmission is reduced
Solution Approach 1:
The transmission bandwidth is segmented into priority and non-priority time slots. The priority transmission period guarantees real-time response speed for control data, while the non-priority transmission period provides dedicated bandwidth capacity for message transmission, effectively resolving the bandwidth conflict through temporal separation.
Data Source
AI summary
An industrial network apparatus includes: a control data communicator configured to transmit control data in a priority transmission period that occurs periodically; and a message data communicator configured to determine whether or not to start transmission of message data in a non-priority transmission period depending on a required transmission time of message data and remaining time of the non-priority transmission period that is different from the priority transmission period, and to transmit the message data when determining to start transmission of the message data.