Cryopump Network Fault Tolerance via Ring Topology Reconfiguration
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Solution Overview
Problem
Conventional vacuum systems face challenges in maintaining continuous operation and fault tolerance due to the lack of efficient communication and reconfiguration mechanisms between nodes, leading to system-wide failures when faults occur.
Innovation Solution
A vacuum control network with a ring topology and a network controller that enables internode communication, detects faults, and reconfigures network segments to maintain connectivity, along with redundant paths and distributed process management to ensure continued operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vacuum system uses a simple network topology without redundancy, then the device complexity is reduced, but the reliability deteriorates because system-wide failures occur when faults happen at any node or segment
Solution Approach 1:
The network topology dynamically reconfigures itself when faults are detected. The system transitions from a static topology to a dynamic one where path selection changes based on real-time fault conditions, allowing the network to adapt and maintain connectivity despite node or segment failures
Solution Approach 2:
The network is divided into discrete segments that can be independently managed and reconfigured. When a fault occurs in one segment, the system can isolate that segment and reroute traffic through alternative segments, preventing single-point failures from cascading system-wide
2Reliability
If the vacuum system implements a ring topology with redundant paths, then the fault tolerance is improved, but the device complexity increases due to additional network segments and control mechanisms
Solution Approach 1:
The redundant ring path is pre-configured and ready before faults occur. When a failure is detected, the system can immediately switch to the pre-established alternative path without requiring complex real-time routing calculations, thus reducing the operational complexity despite the physical redundancy
Solution Approach 2:
The system changes the operational state of network segments (enabled/disabled) based on fault conditions. By dynamically altering which segments are active, the system achieves fault tolerance through parameter changes rather than physical reconfiguration, simplifying the control mechanism
3Reliability
If all nodes are interconnected with multiple paths, then the fault tolerance improves, but the difficulty of detecting and measuring faults increases due to multiple possible failure paths
Solution Approach 1:
The system implements feedback mechanisms where nodes monitor the status of adjacent segments and report faults to the network controller. This structured feedback approach simplifies fault detection by providing clear, localized information about segment status, making it easier to identify and respond to failures despite the complex topology
4Ease of operation
If the system uses a centralized controller for network management, then the ease of operation is improved, but the reliability deteriorates because a single point of failure exists at the controller
Solution Approach 1:
Alternative controller nodes are pre-designated and prepared to take over control functions if the primary controller fails. This preliminary arrangement allows for seamless failover without requiring complex real-time negotiations, maintaining both ease of operation and reliability
Solution Approach 2:
The network controller acts as an intermediary that manages the ring topology and fault responses. By centralizing the intelligence in the controller while distributing the physical ring structure, the system achieves ease of management through centralized logic while the redundant physical paths provide fault tolerance
Data Source
AI summary
A vacuum network control system includes a plurality of nodes configured for control over operational processes of the system. The plural nodes are configured, in a network ring or other topology, as a selectable master node for controlling the operational processes. Control can be distributed among, and passed between, each of the nodes. Each node on the network monitors adjacent network connectors to detect a fault in the network. In response to a detected fault, a disconnect is mapped to the fault, and the network topology is reconfigured for continued communication among the nodes and with external devices.