Distributed-centralized fire-fighting two-bus system

Abstract

The invention provides a distributed-centralized fire-fighting two-bus system, and belongs to the field of fire-fighting safety engineering, the distributed-centralized fire-fighting two-bus system comprises a host module, a detector module and an early warning and alarm module, the host module is used for reading the working state of the detector module and issuing an alarm to the early warning and alarm module through read parameters; the detector modules are installed in a detection area in a distributed mode and used for fire detection in the detection area. Through distributed arrangement, the detection area is enlarged. According to the invention, a distributed-centralized fire-fighting two-bus protocol is designed, so that the response speed of the system is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of fire safety engineering, and in particular to a distributed-centralized fire protection two-bus system. Background Art

[0002] In the field of fire safety engineering, the technical core of most fire alarm systems is the typical fire two-bus system. The host of this system can realize power supply and communication with the slave detectors through two wires at the same time, which has the advantages of simple layout and low power consumption. However, this system also has obvious disadvantages. First, its communication efficiency is low. The host bus polling mechanism is adopted, which requires the host to constantly poll the status of each detector and then observe whether an alarm is triggered. When there are many bus detectors, the system responds slowly. Secondly, due to the use of a distributed detection mode, each detector has a microprocessor, which independently determines whether to report a fire alarm by measuring the fire parameter data in the area. Due to the comprehensive requirements of low power consumption and cost, the processor capacity of the distributed detector is very low and cannot perform complex calculations. In order to prevent false alarms, the system often sets the detector alarm threshold very high, and the system fire alarm monitoring sensitivity is low.

[0003] To solve the above problems, some fire protection manufacturers use universal bus systems such as RS485 and CAN to replace the fire protection secondary bus system. The advantage of the universal bus is that the fire parameter data information collected by all detectors in the system can be transmitted to the host in real time, and then the host will perform comprehensive intelligent analysis, which greatly improves the sensitivity and response time of the system.

[0004] However, the above-mentioned bus requires upgrading the related hardware system, which not only increases the system power consumption and system cost, but also the universal bus adopts the separation of power supply and communication, and is a multi-wire bus. Compared with the typical two-bus system, it increases the cost and difficulty of on-site construction. Faced with the existing fire protection two-bus market, the difficulty of upgrading is also greatly increased, and the market acceptance is low. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a distributed-centralized fire protection two-bus system, including a host module, a detector module, and an early warning and alarm module. The host module is used to read the working status of the detector module and send an alarm to the early warning and alarm module according to the read parameters; the detector module is distributedly installed in the detection area and is used to detect fire in the detection area. When the system is working, the following steps need to be performed: The system is initialized and the detector modules in the system are numbered. The numbering method is to increase the serial numbers of the detector modules from small to large according to the time of access to the system, forming the module numbers of the detector modules.

[0006] During the area configuration phase, the host module sets the area according to the predefined detector relationship and sends the area number to each detector module. The detector module concatenates the area number with the module number to form a unique number for the detector module.

[0007] During the inspection phase, the host module performs inspections through the inspection bus protocol and reads the corresponding working status of the detector module.

[0008] During the alarm stage, the host module checks the existence of detector modules through the inspection bus and enters the early warning query mode. Through the query protocol, the maximum data of fire parameters collected by all detector modules in the same area of ​​the early warning and alarm modules are collected. The host module determines whether there is a fire alarm based on the changing trend of this fire parameter and the detection algorithm.

[0009] Fault state: if there is a fault in the bus inspection, the fault detector module number is directly parsed according to the protocol and reported, and the fault flag is cleared at the same time.

[0010] Furthermore, the bus protocol includes an inspection protocol and an inquiry protocol, and the basic instruction format of the inspection protocol is: inspection function code + inspection result response + detector module number response + check bit, wherein the inspection function code is a fixed format code, and the competition rule of the inspection result response is: fire alarm>fault>warning>normal, and the competition rule of the detector module number response is high-bit competition. The detector number is converted into 8 bits and competes according to the high-bit priority rule. Once a fire alarm occurs and multiple detectors alarm, the detector with the relatively largest code is read first.

[0011] Furthermore, the basic format of the query protocol instruction is: query function code + detector area + detector area data response + check bit, the query function code is a fixed format code, the detector area is the location code of the host built-in detector module, and the competition rule of the detector area data response is: the detector module first normalizes the current fire data and competes according to the high-order priority rule.

[0012] Furthermore, when the detector module is connected to the system, it needs to register on the host module. The system will record the timestamp of each detector module connecting to the system and use the timestamp as the basis for numbering. The system will assign an increasing serial number to the detector module according to the order of the timestamps.

[0013] Furthermore, the predefined detector relationship: the system administrator will predefine the relationship between detector modules according to the layout of the building and fire protection requirements, which includes the floors, areas, and functional areas where they are located; the host module will assign a unique number to each area according to these predefined relationships; the host module will send the area number to each detector module through the communication bus; after receiving the area number, the detector module will combine it with its own module number to form a format such as "area number-detector module".

[0014] Furthermore, during the inspection process, if the host module finds that any detector module reports a fire alarm or warning status, the alarm process will be initiated immediately; the host module enters a special query mode to obtain more detailed fire parameter information; the host module collects fire parameters from all detector modules in the same area through the query protocol.

[0015] Furthermore, the fault state is that during the inspection process, if the host module cannot communicate with a detector module, or the detector module returns error information, the system will identify it as a fault; the host module will parse the number of the faulty detector module according to the protocol, and report the fault information to the monitoring center or management personnel; after the fault is repaired, the system administrator or maintenance personnel will manually or automatically clear the fault flag so that the detector module can rejoin the system and resume normal operation.

[0016] Compared with the prior art, the invention has the following beneficial effects: the invention designs a distributed-centralized fire protection two-bus protocol, which greatly improves the system response speed. The centralized-distributed detection decision mode is adopted to give full play to the maximum computing power of the system, and the host and distributed detectors jointly realize the alarm. When the detector has a fire alarm, it directly reports to the host. When the detector has an early warning, the host combines the fire parameter data information collected by other detectors in the area where the early warning detector is located, and performs a comprehensive intelligent algorithm analysis to achieve tight coupling of information in the area, and conducts overall situation perception of whether there is a fire alarm in the area, so as to make a judgment on whether there is a fire alarm, which greatly improves the sensitivity of the system fire monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An exemplary block diagram of the module distribution arrangement of the present invention.

[0018] Figure 2 An exemplary block diagram of the system of the present invention. DETAILED DESCRIPTION

[0019] Example: Figure 1A distributed-centralized fire protection two-bus system shown includes a host module, a detector module, and an early warning and alarm module. The host module is used to read the working status of the detector module and send an alarm to the early warning and alarm module through the read parameters; the detector module is distributedly installed in the detection area and is used to detect fire in the detection area. When the system is working, the following steps need to be performed: The system is initialized and the detector modules in the system are numbered. The numbering method is to increase the serial numbers of the detector modules from small to large according to the time of access to the system, forming the module numbers of the detector modules.

[0020] During the area configuration phase, the host module sets the area according to the predefined detector relationship and sends the area number to each detector module. The detector module concatenates the area number with the module number to form a unique number for the detector module.

[0021] During the inspection phase, the host module performs inspections through the inspection bus protocol and reads the corresponding working status of the detector module.

[0022] During the alarm stage, the host module checks the existence of detector modules through the inspection bus and enters the early warning query mode. Through the query protocol, the maximum data of fire parameters collected by all detector modules in the same area of ​​the early warning and alarm modules are collected. The host module determines whether there is a fire alarm based on the changing trend of this fire parameter and the detection algorithm.

[0023] Fault state: if there is a fault in the bus inspection, the fault detector module number is directly parsed according to the protocol and reported, and the fault flag is cleared at the same time.

[0024] The bus protocol includes the inspection protocol and the query protocol. The basic instruction format of the inspection protocol is: inspection function code + inspection result response + detector module number response + check bit, among which the inspection function code is a fixed format code, and the competition rule for the inspection result response is: fire alarm>fault>warning>normal. The competition rule for the detector module number response is high-bit competition. The detector number is converted into 8 bits and competes according to the high-bit priority rule. Once a fire alarm occurs and multiple detectors alarm, the detector with the relatively largest code is read first.

[0025] The basic format of the query protocol instruction is: query function code + detector area + detector area data response + check bit. The query function code is a fixed format code, the detector area is the location code of the host's built-in detector module, and the competition rules for the detector area data response are: the detector module first normalizes the current fire data and competes according to the high-order priority rule.

[0026] When the detector module is connected to the system, it needs to be registered on the host module. The system will record the timestamp of each detector module connecting to the system and use the timestamp as the basis for numbering. The system will assign an increasing serial number to the detector module according to the order of the timestamps.

[0027] Predefined detector relationships: System administrators will predefine the relationships between detector modules based on the building layout and fire protection requirements, including the floors, areas, and functional areas where they are located; the host module will assign a unique number to each area based on these predefined relationships; for example, the first module connected is numbered 001, the second is 002, and so on. The host module sends the area number to each detector module through the communication bus; after receiving the area number, the detector module will combine it with its own module number to form a format such as "area number-detector module". Form a format such as "1-001", where "1" represents the area number and "001" represents the module number. The assigned number will be stored in the database of the host module and also written into the memory of the detector module for subsequent identification and communication.

[0028] During the inspection process, if the host module finds that any detector module reports a fire alarm or warning status, the alarm process will be started immediately; the host module enters a special query mode to obtain more detailed fire parameter information; the host module collects fire parameters from all detector modules in the same area through the query protocol.

[0029] The fault state is that during the inspection process, if the host module cannot communicate with a detector module, or the detector module returns error information, the system will identify it as a fault; the host module will parse the number of the faulty detector module according to the protocol and report the fault information to the monitoring center or management personnel; after the fault is repaired, the system administrator or maintenance personnel will manually or automatically clear the fault flag so that the detector module can rejoin the system and resume normal operation.

[0030] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A distributed-centralized fire protection dual bus system, characterized in that: It includes a host module, a detector module, and an early warning and alarm module. The host module is used to read the working status of the detector module and send an alarm to the early warning and alarm module through the read parameters; the detector module is distributedly installed in the detection area and is used to detect fire in the detection area. When the system is working, the following steps need to be performed: System initialization, numbering the detector modules in the system, the numbering method is to increase the number of the detector modules from small to large according to the time of access to the system, and constitute the module number of the detector module; In the area configuration stage, the host module sets the area according to the predefined detector relationship and sends the area number to each detector module. The detector module concatenates the area number with the module number to form a unique number for the detector module. During the inspection phase, the host module performs inspections through the inspection bus protocol and reads the corresponding working status of the detector module; During the alarm phase, the host module checks the presence detector module through the inspection bus and the host module enters the early warning query mode; Through the query protocol, the maximum data of fire parameters collected by all detector modules in the same area of ​​the early warning and alarm module are collected. The host module determines whether there is a fire alarm through the detection algorithm according to the change trend of this fire parameter; Fault state: if there is a fault in the bus inspection, the fault detector module number is directly parsed according to the protocol and reported, and the fault flag is cleared at the same time.

2. A distributed-centralized fire protection dual bus system according to claim 1, characterized in that: The bus protocol includes an inspection protocol and an inquiry protocol. The basic instruction format of the inspection protocol is: inspection function code + inspection result response + detector module number response + check bit, wherein the inspection function code is a fixed format code, and the competition rule of the inspection result response is: fire alarm>fault>warning>normal. The competition rule of the detector module number response is a high-bit competition. The detector number is converted into 8 bits and competes according to the high-bit priority rule. Once a fire alarm occurs and multiple detectors alarm, the detector with the relatively largest code is read first.

3. A distributed-centralized fire protection dual bus system according to claim 2, characterized in that: The basic format of the query protocol instruction is: query function code + detector area + detector area data response + check bit. The query function code is a fixed format code, the detector area is the location code of the host built-in detector module, and the competition rule of the detector area data response is: the detector module first normalizes the current fire data and competes according to the high-order priority rule.

4. A distributed-centralized fire protection dual bus system according to claim 1, characterized in that: When the detector module is connected to the system, it needs to be registered on the host module. The system will record the timestamp of each detector module connecting to the system and use the timestamp as the basis for numbering. The system will assign an increasing serial number to the detector module according to the order of the timestamps.

5. A distributed-centralized fire protection dual bus system according to claim 1, characterized in that: The predefined detector relationships described above: the system administrator will predefine the relationships between detector modules based on the layout of the building and fire protection requirements, including the floors, areas, and functional areas where they are located; the host module will assign a unique number to each area based on these predefined relationships; the host module will send the area number to each detector module through the communication bus; after receiving the area number, the detector module will combine it with its own module number to form a format such as "area number-detector module".

6. A distributed-centralized fire protection dual bus system according to claim 1, characterized in that: During the inspection process, if the host module finds that any detector module reports a fire alarm or warning status, the alarm process will be started immediately; the host module enters a special query mode to obtain more detailed fire parameter information; the host module collects fire parameters from all detector modules in the same area through the query protocol.

7. A distributed-centralized fire protection dual bus system according to claim 1, characterized in that: The fault state is that during the inspection process, if the host module cannot communicate with a detector module, or the detector module returns error information, the system will identify it as a fault; the host module will parse the number of the faulty detector module according to the protocol, and report the fault information to the monitoring center or management personnel; after the fault is repaired, the system administrator or maintenance personnel will manually or automatically clear the fault flag.

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