JPH0337103Y2 - - Google Patents

Description

[Detailed explanation of the idea] 〔Technical field〕 This idea concerns a monitoring board.

[Background Art] A conventional monitoring board is provided with n lines having the same configuration. Regarding the first line, as shown in Figure 2, a fire detection circuit A ₁ and a disconnection detection circuit B ₁ are connected between the positive power line and the negative power line connected to the power terminals T ₁ and T ₂ . Light emitting element for fire indication
A series circuit of LF ₁ , resistor R ₁₁ and transistor Tr ₁₁ is connected to a series circuit of light emitting element LD ₁ for disconnection indication, resistor R ₁₂ and transistor Tr ₁₂ , respectively. In addition, the input terminals of the fire detection circuit A ₁ and the disconnection detection circuit B ₁ are commonly connected, a district terminal L ₁ is provided in this part, a common terminal C is provided on the negative side power line, and the output terminal of the fire detection circuit A ₁ is provided. the transistor
It is connected to the base of transistor Tr ₁₁ , and the output terminal of disconnection detection circuit B ₁ is connected to the base of transistor Tr ₁₂ .

A fire detector P ₁ and a terminating resistor Q ₁ are connected between the district terminal L ₁ and the common terminal C, respectively.

A _o is fire detection circuit, B _o is disconnection detection circuit, LF _o
is a light-emitting element for fire indication, LD _o is a light-emitting element for disconnection indication, R _o1 and R _o2 are resistors, T _o1 and T _o2 are resistors,
L _o is a district terminal, P _o is a fire detector, and Q _o is a terminating resistor, and these constitute the nth line.

In such a monitoring board, for example, when the fire detector _P1 detects a fire, the fire detection circuit _A1 detects this and turns on the transistor _Tr11 to turn on the light emitting element.
Turn on LF ₁ to indicate a fire. In addition, if the line leading to fire detector _P1 is disconnected, the disconnection detection circuit
B ₁ detects this and turns on the transistor Tr ₁₂ to cause the light emitting element LD ₁ to emit light to indicate a disconnection.

Such a conventional monitoring board has light emitting elements LF ₁ ~
LF _o , LD ₁ to _{LD o} are required twice the number of lines,
There are problems in that the cost is high, a large space is required for display, and the overall size is increased. Furthermore, the distinction between fire indications and broken wire indications was not clear.

[Purpose of invention]

The purpose of this invention is to provide a monitoring panel that can clearly distinguish fire detection display and disconnection detection display for multiple lines with a small number of light emitting elements, and can be made smaller and reduce costs. .

[Disclosure of invention]

The monitoring board of this invention includes a group of individual indicator lights each having one end connected to one power terminal, and a first group of switch elements each connected between the other end of the group of individual indicator lights and the other power terminal. , a fire detection circuit group that respectively conducts the first switch element group in response to a fire detection signal from a fire detector; and a first fire detection circuit group each having one end connected to the other end of the individual indicator light group.
a group of backflow blocking diodes, a group of resistors each having one end connected to the other end of the first group of backflow blocking diodes, and a second group of resistors each connected between the other end of the group of resistors and the other power supply terminal. a group of switch elements, a group of disconnection detection circuits that respectively conduct the second group of switch elements in response to detection of a disconnection in the line from the fire detection circuit group to the fire detector; a common indicator light connected to the common indicator light, a second group of backflow blocking diodes each connected between the other end of the common indicator light and the other end of the resistor group, and a common switch having one end connected to the one power supply terminal. and a third group of reverse current blocking diodes connected between the other end of the common switch and the other end of the first group of reverse current blocking diodes.

An embodiment of this invention will be described based on FIG. For the first line, this monitoring board has a fire detection circuit A ₁ , a disconnection detection circuit B ₁ , and a fire detection circuit between the positive power line and negative power line connected to power terminals T ₁ and T ₂ , respectively. Light-emitting element LF ₁ , resistor
R ₁₁ and the series circuit of the transistor Tr ₁₁ which is the first switch element are connected respectively, and the resistor R ₁₁
A series circuit of a first reverse current blocking diode D ₁₁ , a resistor R ₁₂ and a transistor Tr ₁₂ serving as a second switch element are connected in parallel to the series circuit of the transistor Tr ₁₁ . In addition, a second reverse current blocking diode D12 is connected between the other end of the common switch SW whose one end is connected to the positive power line and the connection point of diode _D11 and resistor _R12 , and the second reverse current blocking diode _D12 is connected to the positive power line. Light-emitting element for common disconnection indication with one end connected
The other end of the series circuit of LD and a common resistor R ₃ and the resistor
A third reverse current blocking diode _D13 is connected between _R12 and the connection point of transistor _Tr12 . Further, the input terminals of the fire detection circuit A ₁ and the disconnection detection circuit _{B 1} are connected in common _, and their output terminals are connected to the bases of the transistors Tr ₁₁ and Tr ₁₂ , respectively. A district terminal _L1 is provided at the common input terminal of the terminal, and a common terminal C is provided at the negative side power supply line, and a fire detector _P1 and a terminating resistor _Q1 are connected between these terminals.

A _o is fire detection circuit, B _o is disconnection detection circuit, LF _o
is a light emitting element for fire indication, R _o1 and R _o2 are resistors,
D _o1 , D _o2 , D _o3 are the first, second and third
, T _o1 and T _o2 are transistors which are the first and second switch elements respectively, L _o is the district terminal, P _o is the fire detector, and Q _o is the terminating resistor, which connects the nth line. The same goes for other lines.

In such a monitoring board, for example, when the fire detector _P1 detects a fire, the fire detection circuit _A1 detects this and turns on the transistor _Tr11 , and turns on the light emitting element.
Turn on LF ₁ to indicate a fire.

On the other hand, if the line to the fire detector S ₁ is disconnected, the disconnection detection circuit B ₁ detects this and turns on the transistor.
Turn on Tr ₁₂ . As a result, T ₁ →LD→R ₃ →
Electricity is applied through the path D ₁₃ →Tr ₁₂ →T ₂ , and the common light emitting element LD lights up to indicate a disconnection. At this time, if the switch SW is on, the light emitting element LF ₁ is short-circuited by the switch SW and does not light up, but if the switch SW is off, the transistor Tr ₁₂ is turned on. Therefore, T ₁ → LF ₁
Electricity is applied through the path →D ₁₁ →R ₁₂ →Tr ₁₂ →T ₂ , and the light emitting element LF ₁ lights up. Therefore, it can be determined that the first line is disconnected by lighting up the light emitting element LD and the light emitting element _LF1 .

Fire indications and disconnection indications for other lines are the same as above.

As a result of this configuration, the number of light emitting elements becomes n+1 for n lines, and the number of light emitting elements can be reduced, the space for display can be reduced, miniaturization can be achieved, and cost reduction can be achieved. Furthermore, a fire indication and a disconnection indication can be clearly distinguished. Additionally, if the switch SW is normally turned on, even if a wire breakage occurs, the light emitting element LD will simply turn on, and there will be no mistake that it is a fire.

[Effect of idea]

According to the monitoring panel of this invention, it is possible to clearly distinguish fire detection display and disconnection detection display for multiple lines with a small number of light emitting elements, and it is possible to achieve miniaturization and cost reduction.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of this invention, and FIG. 2 is a circuit diagram of a conventional monitoring panel. A ₁ ~A _o ... Fire detection circuit, B ₁ ~ B _o ... Disconnection detection circuit, LF ₁ ~ LF _o , LD... Light emitting element, Tr ₁₁ ~
Tr _o1 , Tr ₁₂ ~Tr _o2 ...Transistor, D ₁₁ ~ _{D o1} ,
D ₁₂ ~ _{D o2} , D ₁₃ ~D _o3 ... Backflow blocking diode,
SW...Switch, P ₁ ~ P _o ... Fire detector, Q ₁ ~
Q _o ...Terminal resistor.

Claims (1)

[Scope of utility model registration request] A group of individual indicator lights each having one end connected to one power terminal, a first group of switch elements each connected between the other end of the group of individual indicator lights and the other power terminal, and a fire detection device of a fire detector. a group of fire detection circuits that respectively conduct the first switch element group in response to a signal; a first group of backflow blocking diodes each having one end connected to the other end of the group of individual indicator lights; a group of resistors each having one end connected to the other end of the group of blocking diodes; a group of second switch elements each connected between the other end of the group of resistors and the other power supply terminal; A disconnection detection circuit group that conducts each of the second switch element groups in response to detection of a disconnection in the line leading to the fire detector, a common indicator light having one end connected to the one power supply terminal, and the common indicator light. a second group of reverse current blocking diodes each connected between the other end and the other end of the resistor group; a common switch having one end connected to the one power supply terminal; and a common switch having one end connected to the one power terminal; and a third group of backflow blocking diodes connected between the other ends of the group of backflow blocking diodes.