Method for combining fire alarm system and fireproof door opening and closing indication system
By integrating the signal processing function of the fire door opening and closing indicator system into the fire alarm system, the problems of equipment redundancy and high cost are solved, and unified signal processing and display are achieved, improving the redundancy and accuracy of fire safety.
Patent Information
- Application Number
- CN202511519689.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-23
- Publication Date
- 2026-02-13
AI Technical Summary
In existing technologies, fire door opening and closing indication systems and fire alarm systems are two independent systems, which leads to equipment redundancy, large installation space occupation, high procurement costs, increased cable material and labor costs, and the inability to achieve unified signal processing and collaborative display, which increases the complexity of operation and maintenance.
The signal processing function of the fire door opening and closing indicator system is integrated into the control module of the fire alarm system. The signal input and output modules and display of the fire alarm system are shared. The signal processing unit of the fire alarm system processes the fire door position and opening and closing status signals. A dual power supply design and an optocoupler isolation module are adopted to improve the system's anti-interference and accuracy.
It reduces the procurement and laying costs of equipment and cables, simplifies cable design, improves signal accuracy and anti-interference capabilities, achieves precise correlation between fire alarm and door status, and enhances fire safety redundancy.
Smart Images
Figure CN121523093A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of ship safety system, in particular to a method combining a fire alarm system and a fire door opening and closing indication system. BACKGROUND
[0002] In the safety system configuration of a scientific research ship or other ship, the fire door opening and closing indication system and the fire alarm system are key related systems for ensuring the fire safety of the ship.
[0003] The fire door opening and closing indication system takes an electromagnetic door holder as a core executive component, the electromagnetic door holder is installed behind the fire door, and is used to keep the normally closed fire door in an open state, and is provided with a main control box, a ship safety center display and a plurality of accessories; the main control box is provided with a signal processing module and a wiring signal input and output module, and can collect the opening and closing state of the fire door in real time, and transmit the state signal to the ship safety center display for centralized display. The fire alarm system is an independent ship safety system, and is provided with a dedicated control box, a display and a signal I / O module, and is used to realize fire detection, alarm and related signal processing and display functions.
[0004] Because the fire door opening and closing indication system and the fire alarm system have signal interfaces, and both functions serve the fire safety of the ship, in the conventional technical solution, the fire door opening and closing indication system and the fire alarm system are purchased and implemented together. A complete and independent fire door opening and closing indication system is provided by the supplier of the fire alarm system, and is installed and independently operated in parallel with the fire alarm system. The control boxes, signal processing modules and signal I / O modules of the two systems are independently configured.
[0005] However, the two systems still need to be independently configured, resulting in redundant number of ship safety system devices, occupying more installation space, increasing the procurement cost, and the two independent systems need to be designed for cable routing and laid cables, increasing the consumption of cable materials and the cost of on-site laying labor; moreover, the independent devices and modules also increase the complexity and cost of later operation and maintenance, and cannot realize unified processing and collaborative display of signals, which is not conducive to the rapid overall judgment of the fire safety state by the ship safety center. SUMMARY
[0006] The purpose of the present application is to provide a method combining a fire alarm system and a fire door opening and closing indication system, to solve the problems raised in the background.
[0007] To achieve the above purpose, the present application provides the following technical solution: a method combining a fire alarm system and a fire door opening and closing indication system, comprising the following steps: Step one: keep the electromagnetic door holder and the fire door limit switch in the fire door opening and closing indication system, and remove the signal processing module in the original independently configured main control box in the fire door opening and closing indication system; Step two: the fire door position and opening and closing state signal collected by the fire door limit switch is connected to the signal input interface of the fire alarm system; Step three: the signal processing function of the fire door opening and closing indication system is integrated into the control module of the fire alarm system, and the fire door position and opening and closing state signal is processed by the signal processing unit of the fire alarm system; Step four: using the original display of the fire alarm system, the processed fire door opening and closing state signal and the fire alarm signal are displayed on the same display; Step five: take one way uninterrupted power supply from the charging and discharging board of the research ship, and separately supply power for the electromagnetic door; Step six: make the fire door opening and closing indication system share the original signal input and output module of the fire alarm system, and the signals sent to the ship VDR and information system are transmitted from the same signal output interface of the fire alarm system.
[0008] As a further description of the application, in step three, the correlation analysis of the fire door opening and closing state and the fire alarm signal is carried out through the control module of the fire alarm system, when the abnormal opening of the fire door and the space overlap of the fire alarm area are detected, the secondary warning signal is triggered and the related fire alarm point is marked.
[0009] As a further description of the application, in step five, double power supply design is adopted, wherein the main power supply takes power from the charging and discharging board of the research ship, and the standby power supply is supplied by the UPS uninterrupted power supply of the fire alarm system, when the voltage of the main power supply is lower than the threshold value, it is automatically switched to the standby power supply and an alarm is triggered.
[0010] As a further description of the application, in step one, a current monitoring module is added in the power supply circuit of the electromagnetic door, when the working current of the electromagnet is detected to be abnormal, the fault information is uploaded to the ship safety center through the fire alarm system protocol and the specific door position is marked.
[0011] As a further description of the application, in step one, two fire door limit switches are installed on each fire door, and each fire door limit switch collects signals through the differential input channel of the fire alarm system signal input and output module, avoiding single point failure.
[0012] As a further description of the application, in step two, the protocol of the fire alarm system signal input interface matches that of the fire door limit switch, and an optical coupling isolation module is added between the fire door limit switch and the fire alarm system interface to block the interference of the ship power grid.
[0013] As a further description of the application, in step three, a three-dimensional coordinate system of the ship is established, and the positions of the fire doors and the fire detectors are matched in space; when the fire detector alarms, the state of the fire door within a radius of 10 meters is searched, if there is abnormal opening, the secondary warning is triggered.
[0014] As a further illustration of the present application, in step two, the fire door signal is connected to the idle AI / DI channel of the fire alarm system; the channel function is dynamically allocated as the fire door state monitoring through software configuration.
[0015] As a further illustration of the present application, in step six, an Ethernet switch is added in the fire alarm system control box, and the fire door state data is combined with the fire alarm signal and output to the VDR through a single Ethernet.
[0016] As a further illustration of the present application, in step one, the hardware components reserved by the fire door opening and closing indication system also include a fire door control box, which only configures a wiring panel and a few relays for realizing the wiring switching and simple control logic of the electromagnetic door magnet and the uninterruptible power supply.
[0017] Compared with the prior art, the present application has the following beneficial effects: The present application saves the cost of equipment ordering from the source by integrating the control system of the fire door in the fire alarm system and eliminating the independent main control box and core module at the equipment end, and optimizes the design of the cable and saves the cost of the cable and the labor cost of laying due to the integration of the equipment; The double power supply redundancy ensures uninterrupted work of the core components, the double limit switches and the differential input ensure accurate state monitoring, the optical coupling isolation improves the signal anti-interference, realizes the precise association of the fire alarm and the door state, and the multiple measures superimposed significantly improve the fire safety redundancy of the system.
[0018] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 The flowchart of the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 2 The electronic element connection system schematic diagram of the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 3 The electronic element connection system schematic diagram of the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 4 The electronic element connection system schematic diagram of the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 5 The electronic element connection system schematic diagram of the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 6 The electronic element connection system schematic diagram of the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 7 Electronic element connection system schematic diagram for the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 8 Electronic element connection system schematic diagram for the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 9 Electronic element connection system schematic diagram for the method of combining the fire alarm system and the fire door opening and closing indication system of the present application; Figure 10 Electronic element connection system schematic diagram for the method of combining the fire alarm system and the fire door opening and closing indication system of the present application. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.
[0021] Embodiment one: please refer to Figures 1-9 The present application provides a technical solution: a method of combining a fire alarm system and a fire door opening and closing indication system, comprising the following steps: Step one: retaining the electromagnetic door magnet and the fire door limit switch in the fire door opening and closing indication system, and removing the signal processing module in the original independent main control box in the fire door opening and closing indication system; Step two: connecting the fire door position and opening and closing state signals collected by the fire door limit switch to the signal input interface of the fire alarm system; the signal processing of the fire door state, such as position recognition and opening and closing judgment, is completed by the original signal processing unit of the fire alarm system, and an independent signal processing module is not needed; Step three: integrating the signal processing function of the fire door opening and closing indication system to the control module of the fire alarm system, and processing the fire door position and opening and closing state signals by the signal processing unit of the fire alarm system; Step four: using the original display of the fire alarm system to centrally display the processed fire door opening and closing state signals and the fire alarm signals on the same display; Step five: taking one way of uninterrupted power supply from the charging and discharging board of the research vessel to separately supply power to the electromagnetic door magnet; Step six: making the fire door opening and closing indication system share the original signal input and output module of the fire alarm system, and transmitting the signals sent to the ship VDR and information system from the same signal output interface of the fire alarm system.
[0022] In the prior art, the fire door opening and closing indication system needs to be independently configured with a complete main control box including a signal processing module and a special signal input and output module, and the main control box and the control box of the fire alarm system are two independent hardware, both of which are supplied by the same supplier, the core functions such as signal acquisition, processing and transmission are highly repeated, but still need to be purchased, produced and delivered separately. The present application directly removes the core function modules of the original independent main control box of the fire door system: signal processing module, special I / O module, and integrates its functions into the existing control module of the fire alarm system by combining function reuse and hardware simplification: The purchase cost of the independent main control box of the fire door system and the internal core module: signal processing module, special I / O module is saved, and the ordering cost of the auxiliary components such as the independent wiring module and the power module is reduced. For example, the independent fire door main control box and the supporting module procurement cost accounts for about 30% of the total procurement cost of the original two systems, and after integration, this part of the expenditure can be directly avoided; The production and acceptance process of the fire door system main control box is not needed separately, and the integration design is completed by the fire alarm system supplier, which shortens the equipment ordering cycle, and the original two systems need to be accepted separately, and after integration, only one acceptance is needed, which indirectly reduces the supply chain management cost.
[0023] In the prior art, two independent systems need to build double cables: the fire door system needs to lay cables from each fire door limit switch and electromagnetic door catch to its independent main control box, and then lay cables from the main control box to the ship safety center display; the fire alarm system needs to lay cables from the fire alarm detector to its control box, and then to the safety center display.
[0024] The present application realizes cable design simplification: the fire door limit switch signal is directly connected to the nearest fire alarm system signal interface, without the need to be laid to the original fire door main control box first, shortening the length of a single cable, such as the original need from the door body to the fire door main control box to the fire alarm control box, now directly from the door body to the fire alarm control box, the length of a single route can be shortened by 30%-50%; the power supply cable of the electromagnetic door catch only needs to be laid from the main power supply of the charge and discharge panel and the standby power supply of the fire alarm system to the door body, without the need to be connected with the fire door main control box, reducing the number of cables, the original need for power supply line and signal line double route to the main control box, now only need power supply line to the door body; the signals sent to VDR and information system are output through the single Ethernet of the fire alarm system, without the need to lay signal cables for the fire door system separately, further reducing the number of cables. Save cable cost, labor cost and maintenance cost in the later period.
[0025] In step three, the correlation analysis of the fire door opening and closing state and the fire alarm signal is carried out through the control module of the fire alarm system, when the abnormal opening of the fire door and the space overlap of the fire alarm area are detected, the secondary early warning signal is triggered and the related fire alarm point is marked.
[0026] Please refer toFigure 3 In step five, a dual power supply design is adopted, in which the main power supply is powered by the charging and discharging board of the research vessel, and the standby power supply is powered by the UPS of the fire alarm system. When the voltage of the main power supply is lower than the threshold value, the system automatically switches to the standby power supply and triggers an alarm. The dual power supply scheme automatically switches to the standby power supply and triggers an alarm when the voltage of the main power supply is lower than the preset threshold value, such as 20V for a 24V system. The core principle is to achieve redundant power supply through a power supply switching module to avoid the sudden power failure of the electromagnetic door due to the failure of the main power supply, which may cause the normally closed fire door to close unexpectedly, affecting personnel evacuation or equipment access.
[0027] This design directly improves the redundancy of fire safety in extreme scenarios such as fluctuations in the ship's power grid and faults in the charging and discharging board. The electromagnetic door can still maintain normal working status, ensuring that the fire door can be normally opened when there is no fire alarm and closed in time when there is a fire alarm, avoiding fire safety loopholes caused by power supply interruption.
[0028] Please refer to Figure 4 、 Figure 5 In step one, a current monitoring module is added to the power supply circuit of the electromagnetic door. When an abnormal working current of the electromagnet is detected, the fault information is uploaded to the ship safety center through the fire alarm system protocol and the specific door position is marked. By adding a current monitoring module to the power supply circuit of the electromagnetic door, the working current of the electromagnetic door is collected in real time. The normal working current is within a preset range, such as 500-800mA for a 24V system. When an abnormal current is detected, such as less than 500mA for poor contact or more than 800mA for coil short circuit, the fault information including the specific door position is uploaded to the ship safety center through the fire alarm system protocol. The fault type of the electromagnetic door is determined by analyzing the current characteristics, and the precise positioning is achieved by combining the door position code. Compared with the existing technology which requires manual inspection of each fire door, this design shortens the fault troubleshooting time, reduces the workload of maintenance personnel, and avoids the risk of overheating caused by failure to detect faults such as coil short circuit in the electromagnetic door.
[0029] Please refer to Figure 6 In step one, two fire door limit switches are installed on each fire door. Each fire door limit switch collects signals through the differential input channel of the fire alarm system signal input / output module to avoid single point failure. Two limit switches are installed on each fire door, and signals are collected through the differential input channel of the fire alarm system signal I / O module. The principle is to use the anti-interference characteristics of differential signal transmission and double-point verification logic to avoid state misjudgment caused by single limit switch failure such as contact oxidation or loose wiring. When a single point failure occurs, the other limit switch can provide accurate signals, and the system can determine the true state by comparing the two signals.
[0030] Compared with the design of the single-point limit switch in the prior art, the measure improves the accuracy of the fire door state monitoring, effectively prevents false positives of the fire door closing or false negatives of the fire door opening, and avoids safety decision errors caused by signal misjudgment, such as misjudging that the fire door is closed during a fire alarm, thereby delaying fire control.
[0031] Please refer to Figure 7 In step two, the fire alarm system signal input interface is matched with the protocol of the fire door limit switch, an optical coupling isolation module is added between the fire door limit switch and the fire alarm system interface, and the ship power grid interference is blocked. The optical coupling isolation module is added between the fire door limit switch and the fire alarm system signal interface, electrical isolation is realized through photoelectric conversion, noise such as high-frequency interference and ground interference in the ship power grid is blocked, the ship power grid is prone to high-frequency interference due to high-power loads such as propulsion systems and radar equipment, and the interference signal is prevented from entering the fire alarm system to cause distortion of the state signal. The stable transmission of the fire door state signal is ensured: in a complex electromagnetic environment of the ship, the signal error rate is reduced, the ship safety center can obtain accurate fire door states in real time, and false state display caused by interference is avoided, such as misjudgment of the system due to interference that the fire door is opened while it is actually closed, and the overall anti-interference ability of the system is improved.
[0032] In step two, the fire door signal is connected to the idle AI / DI channel of the fire alarm system; the channel function is dynamically allocated as fire door state monitoring through software configuration. The state signal limit switch of the fire door is directly connected to the idle AI / DI channel of the fire alarm system, and the channel function is dynamically allocated through the fire alarm system software, without the need to additionally purchase a special signal connection module. In step six, an Ethernet switch is added in the fire alarm system control box, and the fire door state data and the fire alarm signal are merged and output to the VDR through a single Ethernet. The signal sent to the VDR, i.e., the shipborne navigation data recorder and the information system, is merged and output through a single Ethernet through the newly added Ethernet switch of the fire alarm system, without the need to separately configure an output interface for the fire door system.
[0033] In step one, the hardware components reserved by the fire door opening and closing indication system also include a fire door control box, which is configured only with a wiring panel and a few relays for realizing the wiring switching and simple control logic of the electromagnetic door suction and the uninterruptible power supply.
[0034] The application saves the cost of equipment ordering from the source by omitting the control system of the fire door and integrating it in the fire alarm system, and saves the cost of cable and labor cost due to the integration of the equipment and the optimization of the cable design. Through dual power supply redundancy to ensure uninterrupted work of core components, dual limit switch and differential input to ensure accurate state monitoring, optical coupling isolation to improve signal anti-interference, to realize the precise association of fire alarm and door state, multiple measures to make the system fire safety redundancy significantly improved.
[0035] Embodiment two: please refer to Figures 1-10 The present application provides a technical solution: a method combining a fire alarm system and a fire door opening and closing indication system, comprising the following steps: Step one: keep the electromagnetic door catch and the fire door limit switch in the fire door opening and closing indication system, and remove the signal processing module in the original independent main control box configured in the fire door opening and closing indication system; Step two: connect the fire door position and opening and closing state signals collected by the fire door limit switch to the signal input interface of the fire alarm system; the signal processing of the fire door state, such as position recognition and opening and closing judgment, is completed by the original signal processing unit of the fire alarm system, without the need for an independent signal processing module; Step three: integrate the signal processing function of the fire door opening and closing indication system into the control module of the fire alarm system, and process the fire door position and opening and closing state signals through the signal processing unit of the fire alarm system; Step four: use the original display of the fire alarm system to display the processed fire door opening and closing state signals and the fire alarm signals on the same display; Step five: take one uninterrupted power supply from the charging and discharging panel of the research vessel to power the electromagnetic door catch alone; Step six: make the fire door opening and closing indication system share the original signal input and output module of the fire alarm system, and transmit the signals sent to the ship VDR and information system from the same signal output interface of the fire alarm system.
[0036] In the prior art, the fire door opening and closing indication system needs to be independently configured with a complete main control box including a signal processing module and a special signal input and output module, and the main control box and the control box of the fire alarm system are two independent hardware. Although they are supplied by the same supplier, the core functions such as signal collection, processing and transmission are highly repetitive, but they still need to be purchased, produced and delivered separately. The present application combines function reuse and hardware simplification to directly remove the core function modules in the original independent main control box of the fire door system: signal processing module and special I / O module, and integrates their functions into the existing control module of the fire alarm system: In this embodiment, the rest is the same as in embodiment one, except that in step three, a ship three-dimensional coordinate system is established to match the fire door position with the fire detector position in space; when the fire detector alarms, the state of the fire door within a radius of 10 meters is searched, and if there is an abnormal opening, a secondary warning is triggered. A ship three-dimensional coordinate system is established to match the fire door installation position with the fire detector position in space coordinates.
[0037] When a certain fire detector triggers an alarm, the system automatically retrieves the fire door status within a radius of 10 meters, and if there is an abnormal opening, such as opening during non-evacuation period, not closing during fire, triggering a secondary warning and marking the associated fire point. Through the spatial correlation algorithm, the linkage analysis of fire alarm area and fire door status is realized, breaking through the limitation of independent display of fire alarm and fire door status in the prior art. The staff can quickly locate the fire door that is not closed in the fire alarm area through the secondary warning, and take timely closing measures to prevent the spread of fire through the fire door that is not closed, and reduce the loss of fire accident.
[0038] In step two, the fire door signal is connected to the idle AI / DI channel of the fire alarm system; the channel function is dynamically allocated as fire door status monitoring through software configuration. The state signal limit switch of the fire door is connected to the idle AI / DI channel of the fire alarm system, and the channel function is dynamically allocated through the fire alarm system software, without the need to purchase a special signal connection module; In step six, an Ethernet switch is added in the fire alarm system control box, and the fire door status data and fire alarm signals are merged and output to the VDR through a single Ethernet. The signal sent to the VDR, i.e. the shipborne navigation data recorder and information system, is merged and output through a single Ethernet through the new Ethernet switch of the fire alarm system, without the need to configure an output interface for the fire door system.
[0039] In step one, the hardware components retained by the fire door opening and closing indication system also include a fire door control box, which is configured with only a wiring panel and a few relays for realizing the wiring switching and simple control logic of the electromagnetic door magnet and the uninterruptible power supply.
[0040] The application integrates the control system of the fire door in the fire alarm system, saves the independent main control box and core module at the device end, saves the cost of equipment ordering from the source, and optimizes the design of the cable due to the integration of the equipment, saving the cost of the cable and the labor cost of laying. The double power supply redundant power supply ensures uninterrupted work of the core components, the double limit switch and the differential input ensure accurate state monitoring, the optical coupling isolation improves the signal anti-interference performance, realizes accurate correlation of fire alarm and door state, and the multiple measures are superimposed to significantly improve the safety redundancy of the system.
[0041] Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.
Claims
1. A method for combining a fire alarm system and a fire door opening / closing indication system, characterized in that: Includes the following steps: Step 1: Retain the electromagnetic door catcher and fire door limit switch in the fire door opening and closing indicator system, and remove the signal processing module from the original independently configured main control box in the fire door opening and closing indicator system; Step 2: Connect the fire door position and open / closed status signals collected by the fire door limit switch to the signal input interface of the fire alarm system; Step 3: Integrate the signal processing function of the fire door opening and closing indicator system into the control module of the fire alarm system, and process the fire door position and opening / closing status signals through the signal processing unit of the fire alarm system. Step 4: Using the existing display of the fire alarm system, display the processed fire door opening / closing status signal and the fire alarm signal on the same display. Step 5: Take an uninterruptible power supply from the research vessel's charging and discharging plate to power the electromagnetic door latch separately; Step Six: Make the fire door opening and closing indicator system share the original signal input and output modules of the fire alarm system with the fire alarm system, and make the signals sent to the ship's VDR and information system all transmitted from the same signal output interface of the fire alarm system.
2. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step three, the correlation analysis between the opening and closing status of fire doors and fire alarm signals is performed through the control module of the fire alarm system. When an abnormal opening of a fire door is detected and there is spatial overlap with the fire alarm area, a secondary warning signal is triggered and the associated fire alarm point is marked.
3. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step five, a dual power supply design is adopted. The main power supply is drawn from the charging and discharging board of the research vessel, and the backup power supply is provided by the UPS uninterruptible power supply of the fire alarm system. When the main power supply voltage is lower than the threshold, it automatically switches to the backup power supply and triggers an alarm.
4. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step one, a current monitoring module is added to the electromagnetic door suction power supply line. When an abnormality in the electromagnet's operating current is detected, the fault information is uploaded to the ship's safety center via the fire alarm system protocol, and the specific door location is marked.
5. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step one, two fire door limit switches are installed on each fire door. Each fire door limit switch collects signals through the differential input channel of the fire alarm system signal input / output module to avoid single point of failure.
6. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step two, the signal input interface of the fire alarm system is matched with the protocol of the fire door limit switch, and an optocoupler isolation module is added between the fire door limit switch and the fire alarm system interface to block interference from the ship's electrical grid.
7. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 2, characterized in that: In step three, a three-dimensional coordinate system of the ship is established, and the positions of fire doors are spatially matched with the positions of fire detectors. When a fire detector alarms, the status of fire doors within a 10-meter radius is searched. If any abnormal opening is found, a level two warning is triggered.
8. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step two, the fire door signal is connected to an idle AI / DI channel of the fire alarm system; the channel function is dynamically assigned to fire door status monitoring through software configuration.
9. The method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step six, an Ethernet switch is added to the fire alarm system control box to merge the fire door status data and fire alarm signals and output them to the VDR via a single Ethernet channel.
10. A method for combining a fire alarm system and a fire door opening / closing indication system according to claim 1, characterized in that: In step one, the hardware components retained by the fire door opening and closing indication system also include the fire door control box. The fire door control box is equipped with only terminal blocks and a few relays, which are used to realize the wiring and switching of electromagnetic door latches and uninterruptible power supplies and simple control logic.