Fire Alarm System With Wireless Mesh Redundancy
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Solution Overview
Problem
Existing fire alarm systems rely on a single master-slave communication interface, which can fail if the fire alarm control panel malfunctions or if individual communication links are broken, leading to a loss of communication and operational failure.
Innovation Solution
A secondary wireless mesh network between remote units allows for communication even in degraded mode, providing redundancy and enabling continued operation of fire alarm functions, independent of the primary master-slave system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single master-slave communication system is used between the fire alarm control panel and remote units, then the system structure is simple and cost-effective, but the reliability deteriorates because communication fails when the control panel malfunctions or communication links are broken
Solution Approach 1:
The communication system is segmented into two independent parts: a primary master-slave communication system for normal operation and a secondary peer-to-peer communication system for redundancy. Each remote unit is equipped with both communication interfaces, allowing the system to switch between primary and secondary modes depending on the operational status of the control panel and communication links.
Solution Approach 2:
The secondary communication system is implemented in advance as a backup mechanism. When the primary communication system fails due to control panel malfunction or link breaks, the secondary system automatically activates to maintain communication between remote units, cushioning against the harmful effects of primary system failure before they can cause complete system collapse.
2Reliability
If a secondary wireless mesh network is added between remote units, then the reliability improves through redundancy, but the device complexity increases due to additional transceiver arrangements
Solution Approach 1:
The transceiver arrangement in each remote unit is designed with multi-functionality, serving dual purposes: communicating with the fire alarm control panel via the primary master-slave system and communicating with other remote units via the secondary wireless mesh network. This universal design allows a single additional component to provide both redundancy and enhanced system flexibility without requiring separate dedicated hardware for each function.
Data Source
AI summary
A fire alarm includes comprises a central fire alarm control panel for monitoring the building and activating an alarm; and multiple remote units for distribution within the building, the remote units including indicating devices for determining conditions that are indicative of a possible emergency. The multiple remote units are in communication with the fire alarm control panel in a master-slave relationship such that the fire alarm control panel will receive inputs from the indicating devices and activate the alarm when those inputs indicate a possible emergency. In addition, the remote units include a secondary communication system for communication between remote units in a degraded mode of operation that occurs in the event of a failure of the master-slave communications with the fire alarm control panel, the secondary communication system including a transceiver arrangement at each remote unit for providing a wireless mesh network between the multiple remote units.