Module Switching via Segmented Communication Interfaces
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Solution Overview
Problem
Existing process control systems with redundant modules cannot reliably determine faults in communication lines, leading to potential loss of field control, which is dangerous in certain scenarios.
Innovation Solution
The implementation of modules with switchable operation states and specific interfaces for signaling and communication, allowing for the detection of faults in communication lines and improving the reliability of switching between active and backup states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy line and communication line are used for switching, then module switching can be achieved, but fault detection in communication lines becomes impossible
Solution Approach 1:
The communication path is segmented into multiple independent channels: a first communication line for control signals and a second communication line for verification signals. This segmentation allows independent testing of each channel, enabling fault detection while maintaining switching functionality.
Solution Approach 2:
A third interface is introduced as an intermediary verification channel that is exclusively used for sending verification signals. This intermediary channel enables fault detection without interfering with the primary switching communication, allowing reliable fault identification while preserving switching operations.
2Reliability
If module switching is performed, then active module can be replaced by backup module, but output disruption occurs during switching
Solution Approach 1:
Verification signals are sent in advance before the actual switching occurs. The system checks the status of the backup module and communication lines beforehand, ensuring that switching can proceed smoothly without disruption. This preliminary verification prevents output interruptions by confirming readiness before transition.
Solution Approach 2:
The system implements feedback mechanisms where verification signals confirm the status of communication lines and module states. This feedback loop ensures that switching only occurs when conditions are favorable, maintaining output continuity while achieving fault tolerance through controlled transitions.
3Difficulty of detecting and measuring
If multiple interfaces are used for signaling and communication, then fault detection capability is improved, but device complexity increases
Solution Approach 1:
The first interface serves multiple functions: it sends control signals for switching and can also receive verification signals. This multi-functionality reduces the need for additional dedicated interfaces, maintaining fault detection capability while limiting complexity growth through versatile interface design.
Data Source
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AI summary
The present disclosure relates to modules, systems and method of modules switching. The module has switchable operation states, and includes: a first switching unit, for switching the module between a first operation state and a second operation state; a first interface, for being switched between sending signals to another module which has switchable operation states and receiving signals from the other module, wherein the first interface sends a first signal to the other module when the module is in the first operation state, sends a second signal to the other module when the module is to be switched into the second operation state, and receives signals from the other module when the module is in the second operation state; and a second interface, for communicating with the other module. When the second interface receives a response of the other module to the second signal, the first switching unit switches the module into the second operation state. According to the embodiment of the present disclosure, the reliability of module switching could be improved.