Bus Subscriber Status Signaling for Valid Readiness Detection
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Solution Overview
Problem
Existing bus systems face issues with invalid state messages due to automatic status signal changes without corresponding conditions, making it difficult for the local bus master or PLC to determine the communication readiness of data bus subscribers.
Innovation Solution
A data bus subscriber with a status signal input and output that conditionally changes its status signal value only when all downstream bus subscribers are ready to communicate, using logical AND links and resistance values to ensure accurate communication readiness indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the status signal value changes automatically without condition checking, then the status signal responds quickly to state changes, but invalid state messages are generated and communication readiness cannot be reliably determined
Solution Approach 1:
The patent applies preliminary action by checking the communication readiness condition before changing the status signal value. The data bus subscriber evaluates whether all downstream subscribers are ready to communicate (condition checking) before updating the status signal from the first value to the second value. This prevents premature or invalid status changes while maintaining reliable communication readiness indication.
2Productivity
If the status signal value changes without condition checking, then the signal updates immediately, but the local bus master cannot accurately determine bus completeness
Solution Approach 1:
The patent implements feedback by having data bus subscribers monitor and evaluate the communication readiness of downstream subscribers before updating their own status signal. This creates a feedback mechanism where each subscriber checks the state of the bus configuration (condition checking) before changing the status signal, ensuring that the local bus master receives accurate information about bus completeness and communication readiness.
Data Source
AI summary
A data bus subscriber connected to a local bus, particularly a ring bus, has a status signal input for receiving a first status signal value from a downstream data bus subscriber or a terminator, and a status signal output for providing a second status signal value to an upstream data bus subscriber or to a local bus master. The data bus subscriber is adapted to provide the second status signal value based on a logical link of a communication readiness of the data bus subscriber and the first status signal value.