JPH0155517B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention uses a microcomputer in a central control device to grasp the operating status and presence or absence of an accident of a large number of automatic or manual fire alarms installed in various places on a ship. The present invention relates to a centrally managed ship fire alarm system that displays the results on a display device installed in a wheelhouse or fire control center, detects the occurrence of a fire, and maintains fire alarms.

In recent years, ships have become more labor-saving and automated, and most ships now have unmanned engine rooms. The introduction of systems to centrally manage shipboard work in one place is being promoted, and a particularly important issue here is the establishment of a system that can accurately control fires onboard ships.

By the way, when centrally managing a large number of automatic or manual fire alarms installed at various locations on a ship, conventionally, the large number of fire alarms are divided into several regional groups and managed on a group-by-group basis. To explain this with reference to FIG. 1, in the same figure, n automatic fire alarms 1a, 1b to 1n belong to, for example, an upper deck group, and these are connected via a common first loop line 2a, 2b. and is connected to a receiver 3 as a center device. Further, the n automatic fire alarms 4a, 4b to 4n belong to, for example, a floor plate group, and are connected to the receiver 3 via a common second loop line 5a, 5b. However, each fire alarm has a relay contact A that closes when the power is connected.
and a relay contact B that closes when a fire is detected. R is the resistance value rΩ connected in parallel to the fire alarms 1n and 4n at the end of the loop.
resistor, 6 indicates AC power supply, and 7 indicates DC power supply. Note that a large number of manual fire alarms are connected to the receiver 3 in the same way as automatic fire alarms.

In the conventional device configured in this way, if the resistance value between each loop wire as seen from the receiver 3 side is rΩ, it is determined that the automatic or manual fire alarm of the group is in normal operation. If it is ∞Ω, it is determined that the electrical circuit or power supply is disconnected, and if it is 0Ω, it is determined that a fire has been detected. Further, the receiver 3 side is provided with an alarm device that operates based on these notification signals, and when an accident is detected, a district indicator light belonging to the group concerned lights up and an alarm bell rings. Also,
When a manual alarm push button switch provided on the side of the receiver 3 is pressed, a common indicator light lights up if the report is from a manual fire alarm.

In this way, the center device can determine whether a fire has occurred or whether there is a power abnormality, but since notifications from fire alarms and alarms from the center device are issued in groups, only one of the fire alarms belonging to the group It is not possible to identify which one or how many are reporting, and therefore it is not possible to grasp the location, range, or scale of the accident, which tends to cause confusion in ordering personnel for fire extinguishing, etc. Even if a power failure occurs in a certain fire alarm, it is difficult to identify the alarm, the fire alarm is not easy to maintain, it is not easy to handle, and the reliability is low. There is.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional art. Next, the onboard fire alarm system of the present invention will be explained in detail together with the embodiments shown in the drawings from FIG. 2 onwards.

In FIG. 2, a central control device 8
In addition to the common bus 9 and the CPU 10 that is connected to it and constitutes a microcomputer, the ROM
11, a RAM 12, a clock 13, and a multiplex transmission unit 14, and a common bus 9 includes an interface circuit 1 for a cathode ray tube display 15.
6. An interface circuit 18 for the operation switch group of the operation panel 17, an interface circuit 20 for the alarm 19, and an interface circuit 22 for optional equipment 21 such as a tape coder are connected. Further, a control bus 24 is connected to the control bus drive circuit 23 of the multiplex transmission unit 14, and a data bus 26 is connected to the data input circuit 25 of the multiplex transmission unit 14. And AC and
A power supply line extends from a power supply panel 28 connected to a DC power supply 27 to each circuit. In addition, ion or photoelectric automatic fire alarms FD, flame or heat detection automatic fire alarms TD, and manual fire alarms are also available.
n fire alarms 29a to 29n consisting of PB, etc.
and the same n fire alarms 31a to 31n.
The second local control unit 32 connected to the control bus 24 and the data bus 2
6 and a power supply line 33.

The signal transmission line consisting of the control bus 24 and the data bus 26 is connected to the power supply line 33.
However, if the power source can be obtained from the nearest distribution box, the power line is not included in the cable. In any case, the cable is wired in a loop so that there is no problem even if a disconnection occurs along the way.

In addition, fire alarms 29a to 29n, 31a to 3
Various methods can be used as 1n, but
The basic configuration of both is shown in Figure 3 or 4.
It is as shown in the figure.

In the configuration shown in Figure 3, electrical contact B, which is closed manually or by fire detection, has a resistance value of
It is connected in parallel between the signal output terminals P ₁ and P ₂ together with a resistor R of rΩ (for example, 3KΩ).

The configuration shown in Figure 4 is similar to the ionic type.
It requires a DC power supply, and when the first relay a is energized by the supply of DC voltage, the power supply monitoring contact A closes. When the fire detection unit D detects a fire, the second relay b is energized and its contact B is closed. This contact B is connected in parallel with a resistor R with a resistance value rΩ, and is a signal output terminal.
It is connected between P ₁ and P ₂ via contact A.

On the other hand, the first and second local control units 30 and 32 are each configured as shown in FIG. An analog/digital conversion unit 39 consisting of a D conversion circuit 38 and a control unit 40
and a power supply unit 41. The control unit 40 includes a CPU 42, ROM 43, RAM
44, data output circuit 45 and controller 4
6, terminal 47 is connected to the data bus 26, terminal 48 is connected to the control bus 24, and terminal 4 is connected to the control bus 24.
9 are connected to the power supply line 33, respectively. The power supply unit 41 receives 24V DC as an input, and converts the DC voltage required for each unit to a DC/DC converter.
Created by AVR etc.

When a resistance value signal of 0Ω, rΩ or ∞Ω is input from the fire alarms 29a to 29n to the local input unit 36, this signal is converted into a voltage signal of 0 to 5V by the preamplifiers 34a to 34n. While the data is converted into a digital signal by the analog-to-digital conversion unit 39, the control unit 40 forming data acquisition means and data transmission means instructs from the CPU 42 which channel of the local input unit 36 data is to be acquired. The selection is made by the control signal.
However, this selection applies to the multiplexer circuit 35 in the local unit 36 and the multiplexer circuit 37 in the analog-to-digital conversion unit 39.
This is achieved by controlling the The digitized data signal of the selected channel is then transferred to the RAM 44 of the control unit 40.
This data collection operation is
Until a data sending request is received from the center device 8, the process is repeated at regular intervals based on a signal from the CPU 42.

The control signal sent from the control bus drive circuit 33 of the center device 8 in FIG. 2 to the control bus 24 is as shown in FIG. 6a.
The reset signals R ₁ , R _{2 .} . . and carry signals T ₁ , T ₂ .
0 and 32 to output the data stored in the unit to the data bus 26. That is, when the reset signal _R1 is output, channel 0 for transmission line check is selected, and when the carry signal T1 is output, channel ₁ corresponding to the fire alarm 29a is selected. Then, carry signals T ₂ , T ₃ . is commanded.

Also, when outputting data, the local control unit interrupts the data collection operation and
The data stored in the RAM 44 is transmitted in the form of a serial signal to the data bus 26 in a time-division manner. The serial signal is then taken in from the fire alarm group as illustrated in Figure 6b.
Consists of pulse patterns corresponding to three types of data signals: rΩ, ∞Ω, and 0Ω, and a transmission line tick signal, and when rΩ (during normal operation during period BB)
Sends a 3-series pulse signal when the voltage is ∞Ω (when the electric circuit or power supply is cut off in period D), and sends a 5-series pulse signal when it is 0Ω (when a fire is detected during period C)
There is no pulse, and during the transmission line check in period A, a 4-pulse signal is sent out. Note that after sending out the data signal, the local control unit can repeat the data collection operation again.

The serial signal is sent to the CPU 10 through the data input circuit 25 of the center device 8 and the common bus 9.
Once entered, a simple calculation is performed to determine the pulse pattern, the signal content is determined, and the status of each fire alarm is determined. Then, a display based on this discrimination result is projected on the screen of the cathode ray tube display 15 as a display device,
If an alarm is required, the alarm device 19 issues an alarm. Further, when an abnormality is detected in the equipment or the transmission line by the self-monitoring function such as the transmission line check signal, the contents are displayed on the screen of the cathode ray tube display 15. These displays can display the words "abnormality" or "accident" or a floor plan of the accident location using a tape recorder or the like of the optional equipment 21.
You can also make announcements at the same time. Also,
It is also possible to operate an automatic fire extinguisher according to a preset program. Furthermore, if you want to deactivate a specific fire alarm, use the operation panel 17.
Only the circuit concerned can be disconnected using the switch.

As described above, the present invention connects a plurality of local control units to the multiplex transmission unit of a central control device consisting of a microcomputer, a multiplex transmission unit, a display device, etc. via a multiplex transmission line, and a data collection means for connecting each of the fire alarms in groups to each of the control units, and sequentially and repeatedly collecting data on the presence or absence of power supply to each fire alarm and fire detection from each of the control units; By inputting a control signal of a serial pulse train requesting data transmission via the transmission line, the transmission unit detects power abnormality, normal operation, or fire of each fire alarm based on the collection results of the collection means at the pulse interval of the control signal. data transmission means for time-divisionally transmitting a data signal of a serial pulse train of any one of the detected pulse patterns to the computer via the transmission line and the transmission unit; The present invention provides an onboard fire alarm system characterized in that the state of each fire alarm is determined from the above, and the determination result is displayed on the display device.

Therefore, according to the onboard fire alarm system of the present invention, when a control signal requesting data transmission from the center device is input to each local control unit, the power supply abnormality or normal operation of each fire alarm is detected based on the collected results. , data signals with three types of pulse patterns indicating fire detection are time-divisionally transmitted to the computer of the center device at pulse intervals of the control signal, and the computer of the center device determines the power supply of each fire alarm from the pulse pattern of each data signal. Abnormality, normal operation, and fire detection are determined and the determination results are displayed on the display device, and each fire alarm is centrally managed on an alarm unit basis.
Fire detection and power supply abnormalities for each fire alarm can be grasped at the same time through a simple process of determining pulse patterns without the need for complex data decoding processing. It is possible to provide an easy-to-handle and highly reliable onboard fire alarm system that can automatically and simultaneously perform the following steps.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional ship fire alarm system, Figure 2 and the following drawings show an embodiment of the ship fire alarm system of the present invention, Figure 2 is a block diagram, and Figures 3 and 4 are 5 is a block diagram of a local control unit, FIG. 6a is a waveform diagram of a control signal, and FIG. 6b is a waveform diagram of a data signal. 8... Center device, 14... Multiplex transmission unit, 15... Cathode ray tube display, 24... Control bus, 26... Data bus, 29a,
29n, 31a, 31n...fire alarm, 30,
32...Local control unit, 42...
…CPU.

Claims (1)

[Claims] 1. A plurality of local control units are connected via multiplex transmission lines to the multiplex transmission unit of the central control device consisting of a microcomputer, a multiplex transmission unit, a display device, etc., and a large number of fire alarms are connected in groups. a data collection means that is connected to each of the control units and sequentially and repeatedly collects data on the presence or absence of power supply to each fire alarm and fire detection from each of the control units; the transmission unit from the computer; and the transmission line. By inputting a control signal of a serial pulse train requesting data transmission via the control signal, the pulse pattern of any one of power abnormality, normal operation, and fire detection of each fire alarm based on the collection result of the collection means is determined at the pulse interval of the control signal. and data transmission means for time-divisionally transmitting a serial pulse train data signal to the computer via the transmission line and the transmission unit, and the computer determines the state of each fire alarm from the pulse pattern of each data signal. An inboard fire alarm system, characterized in that the determination result is displayed on the display device.