Master Subscriber Forwarding Time Control for Network Telegrams
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Solution Overview
Problem
Existing automation communications networks face challenges in ensuring reliable real-time data transmission due to potential collisions and overload situations between real-time and non-real-time relevant telegrams, particularly when using distribution nodes with multiple network segments, which can lead to delayed or lost data packets and increased configuration times.
Innovation Solution
A data transmission method where telegrams from slave subscribers to master subscribers are assigned control data containing forwarding-time information, determined by the master subscriber, to manage the timing of telegram transmission through distribution nodes, preventing collisions and overload situations by allowing flexible planning of data exchange cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If distribution nodes forward telegrams using FIFO principle or fixed routing tables, then device complexity is reduced, but real-time capability and reliability deteriorate due to collisions and overload situations
Solution Approach 1:
The master subscriber determines forwarding times for telegrams before transmission and includes this timing information in the telegram itself. Distribution nodes simply forward telegrams at the pre-specified times without complex decision-making, eliminating collisions and overload situations while maintaining simple device architecture.
Solution Approach 2:
The system dynamically adjusts forwarding times based on network conditions and telegram priorities. The master subscriber can modify forwarding time information in subsequent telegrams to optimize real-time performance without requiring complex reconfiguration of distribution nodes.
2Reliability
If distribution nodes store routing tables with forwarding times for all telegrams, then real-time capability improves, but device complexity and configuration time increase
Solution Approach 1:
The complex routing table storage function is extracted from distribution nodes and relocated to the master subscriber. Distribution nodes only need to read forwarding time information from incoming telegrams and execute simple forwarding operations, significantly reducing their complexity while maintaining real-time capability.
Solution Approach 2:
Each telegram carries its own forwarding time information, making it self-descriptive. Distribution nodes do not need external routing tables or configuration data; they simply read the timing information from the telegram itself and forward accordingly, eliminating the need for complex centralized routing tables.
3Reliability
If forwarding times are pre-stored in distribution nodes, then real-time capability improves, but adaptability deteriorates due to increased configuration times
Solution Approach 1:
The system transitions from static pre-configured routing tables to dynamic per-telegram forwarding time specification. The master subscriber can adjust forwarding times adaptively based on changing network conditions and requirements, providing both real-time reliability and configuration flexibility.
Solution Approach 2:
The system enables feedback-based optimization where the master subscriber can observe network performance and adjust forwarding time information in subsequent telegrams. This allows continuous adaptation to changing conditions while maintaining real-time transmission reliability.
Data Source
AI summary
A communications network having a master subscriber M and at least one slave subscriber. At least one distribution node CU1, CU2, CU3, CU4 is provided which has a plurality of input/output interfaces, each of which is connected to a network segment, the master subscriber M arranged in a first network segment M1 and the slave subscriber arranged in a second network segment S1, S2, S3, S4, S5. Data is exchanged between the master subscriber M and the slave subscriber in the form of telegrams initiated by the master subscriber. The telegrams to be sent from the slave subscriber to the master subscriber are each assigned control data containing a forwarding time information when the corresponding telegram is to be output from the distribution node via the input/output interface in the direction of the first network segment comprising the master subscriber, the forwarding time information determined by the master subscriber M.