Fire alarm device

Abstract

In the case in which a disconnection failure occurs in a loop transmission line and signal transmission from both sides of the disconnected part is enabled to allow continued fire monitoring, the invention makes it easy to understand the disconnected segment on the receiver side. Fire detectors 18 are connected to the loop transmission line 12 that is connected to a receiver 10, and in the case that the loop transmission line 12 is normal, the communication connection is made from a transmission unit 23 to the fire detectors 18 to monitor for fires. In the case that a disconnection failure hasoccurred in the loop transmission line 12, a disconnection monitoring control unit 28 turns on switching circuit 30a, 30b to connect the end of the loop transmission line 12 to the transmission unit23, and the communication connection from both ends of the loop transmission line 12 to the fire detectors 18 is made to monitor for fires. In the loop transmission line 12, relay devices 20 are provided which are configured with unique addresses and have a current direction detection function, and the normal current direction during normal operation and a reverse current direction at a time of disconnection are detected and transmitted to the receiver 10. If the disconnection occurs in the loop transmission line 12, a disconnected segment determination unit 32 of the receiver 10 determines and notifies of a disconnected segment, which is a segment in which the normal current direction detected by multiple relays 20 changes to the reverse current direction.

Description

technical field [0001] The present invention relates to a fire alarm device for monitoring a fire by connecting a fire detector to a loop transmission line drawn from a receiver. Background technique [0002] In the past, in the known R-type fire alarm equipment, a terminal device such as a fire detector with a transmission function is connected to the transmission line drawn from the receiver, and a search is issued based on, for example, a fire interruption from the fire detector when a fire is detected. command to determine the address of the fire detector that issued the alarm, display the address where the fire occurred, and collect and monitor fire data from the determined fire detector. [0003] In this way, if the address of the fire detector that detected the fire is known, appropriate evacuation guidance and fire extinguishing activities can be performed, and it becomes an indispensable function especially in fire monitoring of large-scale facilities. [0004] In ...

AI Technical Summary

Problems solved by technology

[0016] But, in such existing fire alarm equipment, as Figure 10 As shown in (B), when a disconnection 31 occurs in the middle of the loop transmission line 12, the disconnection monitoring control unit 28 detects a disconnection fault, and the switching circuit units 30a, 30b connect the end side of the loop transmission line 12 to the transmission line. 23 is connected, and signal transmission is carried out to the loop transmission line 12 from both sides of the broken line, so that the fire monitoring function of the fire detector 18 connected to the loop transmission line 12 will not be lost, but there are the following problems: The receiver 10 cannot detect where a disconnection has occurred on the loop transmission line 12, and it takes effort and time until the disconnection is found and repaired

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