JPS61245294A - Fire receiver recovery apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a fire receiver restoration device, and more particularly to fire restoration of a receiver and computer reset using a microconbeater.

``Prior Art'' Conventionally, in general, the operation of the fire detector of a fire alarm system and the alarm display operation of the receiver are self-maintaining once activated, so a fire recovery switch is provided in the operation section of the receiver.
All functions are restored when this switch is operated. - In the receiver (11) that uses a microconbeater or the like for power signal processing, a reset switch is generally provided on a PC board or the like outside the operation section in order to return the computer to its initial state in the event of an abnormality in the computer.

[Problems to be solved by the invention] In a fire receiver using a microcomputer, etc., it is undesirable that the computer's reset switch is easily operated during normal monitoring, and that it is not desirable to Since it is rarely used, it is not desirable to provide it in the operating section. For this reason,
Providing the reset switch inside the receiver housing has the disadvantage that it is difficult to operate when necessary and it takes time to operate it.

``Means for Solving Problems'' This invention enables a switch that is used for fire recovery when a computer is normally executing a processing program to also function as a reset switch for the computer when the computer malfunctions. This allows a single recovery switch to be used for both purposes.

"Embodiment" A fire receiver restoration device of the present invention will be explained based on the drawings.

The drawing is a block circuit diagram showing an embodiment of the fire receiver restoration device of the present invention, which includes a central processing unit MC such as a microprocessor, a memory IJ-MR storing processing programs or data, etc. , a microcomputer consisting of an input port IP to which signals from sensors and operation parts are input, and a converter port OP to which various signals are output, a recovery switch SW, a pull-up resistor R1, and an inverter circuit. A gate circuit consisting of IN, a NAND circuit NAD, an AND circuit AND, and an output port OP.
The gate OR circuit ORI,2 connected to
2 to 5, a recovery circuit consisting of transistors Q1 and Q2, a resistor R6 that resets the central processing unit MC when the power is turned on, and triggers the mono-multivibrator group, and a capacitor C
It is composed of P.

Incidentally, a fire detector SE is connected between a pair of lines extending from terminal C to the outside of the receiver.

To explain the operation of the fire receiver recovery system constructed as described above, the computer normally executes an infinite loop of a monitoring routine.

Therefore, if a status signal is outputted from the output port OP to the OR circuit OR2 in a routine that is always passed in the monitoring routine, this status signal will be outputted at least once during the maximum possible processing time from the program. On the other hand, when the power is turned on, the reset terminal RD of the central processing unit MC is instantaneously brought to a low level by a circuit consisting of a resistor R6 and a capacitor CP. It is triggered and makes the output Q low level. The mono multivibrator MM has a retrigger operation, and the output pulse width is set slightly longer than the predetermined time, so
When the status signal is normally output, it is always triggered via the OR circuit OR2 and the output Q maintains a low level state. In this state, a signal from a circuit (not shown) for detecting the operating state of the fire detector SE is input to the
) The Conbeater constantly monitors the status of the fire detector SE by means of a processing program.

For example, when the fire detector SE is activated, this activation signal is input to the input IP, and the computer identifies from this input data that the fire detector SE has activated, and outputs a corresponding alarm signal. The signal is output from the boat OP and drives an alarm display unit (not shown) such as an indicator light or a bell.

Some of the fire detectors SE are self-maintaining once activated, and this can be restored by interrupting the power supply. The alarm display section of the receiver also maintains the alarm state. Therefore, if a person recognizes the alarm condition and wants to cancel the alarm condition after checking the site where the fire detector SE is installed, he or she operates the recovery switch SW. The recovery switch SW closes the contact and connects the input capo connected to the resistor R1).
The IP terminal changes from high level to low level, and when the computer confirms that the recovery switch SW has been operated, it stops the driving state of the alarm display section, and also turns the alarm display unit off.
A recovery signal of a predetermined pulse width of low level (usually high level) is output from OP to OR circuit ORI. Since the output Q of the mono multivibrator MM is low level, an O-level restoration signal is outputted to the output of the AND circuit AND. Therefore, transistor Q1 becomes conductive, transistor Q2 becomes cut-off, and the fire detector S
Interrupt power supply to E and restore fire detector SE. In this way, the recovery switch SW is normally used for recovery after a fire alarm.

If the computer is in an abnormal state and the status signal is not output for a predetermined period of time or more, the output Q of the mono multivibrator will become abnormal. The output of the OR circuit OR2 remains at the NO level and does not change even if a status signal is subsequently output from the output port OP. An indicator light (not shown) that is driven when the output Q of the mono-multivibrator gate reaches the NO level can notify of a CPU abnormality. This circuit consisting of the mono-multivibrator claw and the like constitutes a status signal monitoring circuit.

In this state, when the recovery switch SW is operated, the input of the inverter circuit IN changes from the NO level to the LOW level. Since the output Q of the mono multivibrator MM is at a high level, the outputs of the NAND circuits NA and D are at a low level, and the output of the AND circuit AND is also at a low level. The output of the NAND circuit NAD is connected to the reset terminal of the central processing unit MC via a resistor R6.

Since RD is connected to the trigger terminal B of the mono-multivibrator claw, the reset terminal RD is set to low level and the central processing unit MC is reset.

Moreover, the mono-multivibrator circuit is triggered when the trigger terminal B changes from low level to high level. Therefore, as soon as the operation of the recovery switch SW is completed, the computer starts from the initial state, and the mono multivibrator MM is triggered to set the output Q to a low level. On the other hand, when the recovery switch SW is operated (closed), the AND circuit AN
Since the output of D is at a low level, the transistor Q1 is in a conductive state and the transistor Q2 is in a cut-off state, so that the power supply to the fire detector SE is interrupted and restored.

Furthermore, since the combiner returns to its initial state, even if it is in an alarm display state, it will all be restored when the initialization routine is executed.

In this way, the recovery switch SW also functions as a reset switch for the central processing unit 4 when the converter is abnormal.

"Effects of the Invention" As explained above, the fire receiver recovery device of the present invention normally functions as a recovery switch in the event of a fire alarm using the recovery switch SW provided in the operation section, and also functions as a recovery device in the event of a computer abnormality. It can also function as a reset switch, and a single switch can serve both purposes. It also has features such as easy and error-free operability.

[Brief explanation of drawings]

The drawing is a block circuit diagram showing an embodiment of the fire receiver restoration device of the present invention. MC...Central processing unit, MR...Memo IJ-1IP
...input port, OP...output port), MM...
Mono multivibrator, IN...inverter circuit,
NAD...NAND circuit, AND...AND circuit, O
RI, 2...OR circuit, R1-6...resistance, Ql,
2...Transistor, CP...Capacitor, SW・
...Recovery switch, SE...Fire detector.

Claims (1)

[Claims] A fire receiver that inputs the signal from the fire detector to a computer via an interface, and the computer determines whether the fire detector is activated based on the input data, and displays the area where the fire occurred when the fire detector is activated. In the recovery device, the receiver includes a recovery switch for recovering the alarm display state, a recovery circuit for recovering the fire detector based on the operation of the recovery switch, and the computer normally executes the processing program. A status signal that is always outputted once within a predetermined time when the status signal is output, a lookout circuit that detects that the status signal is not output even once within the predetermined time and displays an indication, etc. a gate circuit that is controlled and inserted between the recovery switch and a reset terminal of the computer;
A recovery device for a fire receiver, characterized in that the computer is reset based on the operation of the recovery switch when the computer is abnormal.