JPH09231493A - Line separation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make only a sensor connected to one division generating short circuit unusable providing a non-directional means eliminating the distinguishing of an input side and an output side. SOLUTION: In an isolator 4, a diode bridge D2 equivalent to a rectifier circuit is provided between second terminals L2 and C2 in addition to a diode bridge D1 between first terminals L1 and C1 , and diodes Db and DCare provided in place of the diode of an existent isolator. In the isolator 4, there is no distinction between the input and output sides to operate equally whichever the first terminals L1 and C1 sides or the second terminal L2 and C2 are connected to the side of a fire receiver equivalent to a monitoring device. In addition either the diode bridges D1 or D2 prevents the system-down of the whole system caused by the bad influence of a short-circuited sensor line to the whole sensor line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line separation device for avoiding a system down of an entire monitoring system by disconnecting a shorted sensor line.

[0002]

2. Description of the Related Art FIG. 3 is an internal circuit block diagram showing a conventional line separation device, and FIGS. 4 and 5 are wiring system diagrams of a monitoring system for explaining the conventional line separation device.

[0003] In Figures 4 and 5, 1 is a fire receiver which corresponds to the monitoring device, 2 sensor lines for power and signal extending from the fire receiver, 3 _1, ... is predetermined physical such as a fire or gas leak The detectors 41 _, ... For detecting an event are isolators corresponding to the line separation device.

[0004] fire receiver 1, sensors 3 ₁ via the sensor lines _2, ... and the isolator 4 _1, ... outputs a polling signal sequentially cyclically to, sensor 3 _1, ... and the isolator 4 _{1 The} response signals are sequentially returned from the _, ... _, And the states of the sensors 3 _1, ... And the isolators 41 _, . Each of the sensors 3 _1, ... constantly monitors the presence or absence of a fire around itself, and when the fire receiver 1 is accessed by a polling signal that matches its own unique address, the presence or absence of a fire as a monitoring result. Sensor line 2
To the fire receiver 1 via.

The isolator 4 _1, ... Allows the polling signal from the fire receiver 1 to pass from its own input side to its own output side at normal times, but when the sensor line short circuit occurs _{, the} isolator 41 _, . By disconnecting from the output side of its own, the adverse effect due to the short circuit of the sensor line is prevented from spreading to the entire monitoring system, and when the fire receiver 1 is accessed with a polling signal that matches its own unique address. Then, the interruption presence / absence state between its own input side and its own output side as a monitoring result is returned to the fire receiver 1 via the sensor line 2. Further, the isolator 41 _, ... Is accessed by the fire receiver 1 by a polling signal that matches its own unique address. If this polling signal includes a control command, the isolator 41 _, ... It is designed to be able to cut off or release between the output side and its own output side.

The monitoring system shown in FIG.
The detector line 2 extends from the transmitter 1, and this detector circuit
Multiple isolator 4 on line 2_1,… 4_FourEach input of
The sides are connected. In addition, the isolator 4₁Output side of
There is a branched sensor line 5 ₁But isolators 4_Twoof
Sensor line 5 branched on the output side_TwoBut an isolator
4_ThreeThe sensor line 5 is branched to the output side of_ThreeBut Iso
Lator 4_FourThe sensor line 5 is branched to the output side of_FourBut,
Each is connected. Furthermore, a branched sensor line
5₁Sensor 3_1,… 3_FourAnd terminating resistor 6₁And branch
Detector line 5_TwoSensor 3_Five,… 3₈And termination resistance
Bowl 6_TwoIs a branched sensor line 5_ThreeSensor 3_9,
… 3₁₂And terminating resistor 6_ThreeIs a branched sensor line 5
_FourSensor 3_13,… 3₁₆And terminating resistor 6_FourAnd that
Each is connected.

The monitoring system shown in FIG.
The detector line 2 extends from the transmitter 1, and this detector circuit
Isolator 4 on line 2₁Connected to the input side of
Isolator 4₁Sensor line 7 on the output side of₁Is connected
This sensor line 7₁Sensor 3_1,… 3_3,And Iso
Lator 4_TwoIs connected to the input side of the isolator 4
_TwoSensor line 7 on the output side of_TwoConnected to this sensor
Line 7_TwoSensor 3_Four,… 3_6,And isolator 4_ThreeEntering
The power side is connected and the connection is made with the sequential feed wiring.
Has been continued.

By the way, as shown in FIG.
4 is the first terminal (input terminal) L_1,C ₁And the second terminal (output
Terminal) L_2,C_TwoAnd Further, the isolator 4 is
Inside, diode bridge D corresponding to the rectifier circuit
₁And the diode D_aAnd reply circuit section A₁And short circuit detection
Circuit part A_TwoAnd the power supply circuit section A_ThreeAnd the receiving circuit section A_FourWhen,
Control circuit section B, electrolytic capacitor E, switch circuit F
_1,F_TwoAnd a two-winding latching relay corresponding to the separating means
G and.

The diode bridge D ₁ has a first terminal L _1,
The voltage of the polling signal applied between C ₁ is rectified and output. The return circuit unit A ₁ is, for example, a resistor (not shown).
And a switching transistor (not shown) in a series circuit, and turns on / off the switching transistor based on the reply control signal output from the output port RET of the control circuit section B, and outputs the rectification output from the diode bridge D _1. The applied voltage is applied or not applied to the resistor at high speed, and a digital signal for returning the current is returned to the fire receiver 1 depending on the amount of the consumed current flowing through the sensor line 2.

When the voltage output from the diode bridge D ₁ remains below the predetermined voltage value for a predetermined time or longer, the short-circuit detection circuit section A ₂ determines that a short circuit has occurred in the sensor line 2 and the control circuit A signal indicating that a short circuit has been detected is output to the input port P0RT1 of the section B. The power supply circuit unit A ₃ smoothes the rippled rectified voltage output from the diode bridge D ₁ and converts it into a constant voltage to supply power to the control circuit unit B. The receiving circuit section A ₄ converts the polling signal applied between the first terminals L _{1 and} C ₁ into a signal based on a predetermined rule to convert the input port SIG of the control circuit section B.
To enter.

The control circuit section B is configured to include a microcomputer, and has a power supply input section VADC for analog circuits, a power supply input section VDD for digital circuits, and input ports SIG, PORT1.
And output ports RET, PORT2, PORT3, and ground GND. The control circuit unit B recognizes the command for itself from the fire receiver 1 based on the signal input to the input port SIG. Further, when a signal indicating that a short circuit is detected is input from the short circuit detection circuit section A ₂ to the input port PORT1, the control circuit section B outputs a pulse signal for turning on the switch circuit F ₂ from the output port PORT3. Further, in the control circuit unit B, the signal input to the input port SIG is set at its first terminal L _1, C
Outputs a pulse signal for turning on the switch circuit F ₁ from the output port PORT2 if control command signal to the effect of releasing the blocking between ₁ side and the second terminal L _2, C ₂ side of the self, the self second If the control command signal is to disconnect between the 1st terminal L _{1 and} C ₁ side and the second terminal L _{2 and} C ₂ side of itself, a pulse signal for turning on the switch circuit F ₂ is output from the output port PORT3. Is being done.

The electrolytic capacitor E is for smoothing the voltage output from the power supply circuit unit A ₃ and storing electric charges, and for a while even if the polling signal applied between the first terminals L _{1 and} C ₁ is lost. The power can be supplied normally.

The two-winding latching relay G has a terminal G_1,…
G_TenIt has. Terminal G_1,G_FiveReset winding G between
_rIs connected to the terminal G_6,G_TenSet winding G between_sContact
Has been continued. Also, terminal G_ThreeAnd terminal G₈And independent
The respective switching pieces are provided. And 2 volumes
Wire latching relay G is reset winding G_rIs excited
Then, the terminal G_2,G_ThreeAnd terminal G_7,G₈Each between
Turns on and terminal G_3,G_FourAnd terminal G_8,G₉while
Turn off each and set winding G_sIs excited, the end
Child G_2,G_ThreeAnd terminal G_7,G₈Turn off each
With terminal G _3,G_FourAnd terminal G_8,G₉In between
Turn on.

The internal circuit of the isolator 4 is connected as follows. That is, the first terminal L ₁ is connected to one input portion of the diode bridge D ₁ and the terminal G _{3 of} the two-winding latching relay G. The first terminal C ₁ is connected to the other input of the diode bridge D ₁ , the terminal G _{8 of} the two-winding latching relay G, and the anode of the diode D _a . The cathode of the diode D _a is connected to the other end of the receiving circuit section A ₄ . The second terminal L ₂ is connected to the terminal G ₄ of the two-winding latching relay G, and the second terminal C ₂ is connected to the terminal G ₉ of the two-winding latching relay G.

The plus output section of the diode bridge D ₁ is connected to each of the plus power supply input sections of the return circuit section A ₁ , the short circuit detection circuit section A ₂ and the power supply circuit section A ₃ . The negative output of the diode bridge D ₁ is grounded. In addition, the reply circuit section A ₁ and the short circuit detection circuit section A ₂
The negative power input section of each of the power supply circuit section A ₃ and the power supply circuit section A ₃ is grounded. The positive output section of the power supply circuit section A ₃ is
One end of the receiving circuit section A ₄ , the power supply input section VADC of the analog circuit of the control circuit section B, the power supply input section VDD of the digital circuit of the control circuit section B, one end of the electrolytic capacitor E, and the two-winding latching relay G Are connected to terminals G _{1 and} G ₆ , respectively. The minus power supply input part GND of the control circuit part B and the other end of the electrolytic capacitor E are grounded. The terminal G ₅ of the two-winding latching relay G is grounded via the switch circuit F ₂ . The terminal G ₁₀ of the two-winding latching relay G is grounded via the switch circuit F ₁ .

A monitoring system of a wiring system diagram as shown in FIG.
If the fire receiver 1 is turned on, there is a fire.
Pollin including control signal from receiver 1 to sensor line 2
Signal is output and each isolator 4_1,… 4_Four
Power is supplied to each isolator 4_1,… 4_Four
Switch circuit F from the output port PORT2 of₁Turn on
A loose signal is output and each isolator 4_1,… 4
_FourIs the first terminal L of its own _1,C₁Side and self second terminal L_2,C
_TwoThe fire receiver 1
Polling signals from each sensor 3_1,… 3₁₆To
Transmitted, each sensor 3_1,… 3₁₆Is around me
Returns the presence / absence of a fire to the fire receiver 1 via the detector line 2.
Believe each isolator 4_1,… 4_FourIs my first
Terminal L_1,C₁Side and self second terminal L_2,C_TwoIsolation between sides
Return the disconnection status to the fire receiver 1 via the detector line 2.
I do.

Here, for example, the branched sensor line 5
_When a short circuit occurs in ₄ , the effect of this short circuit spreads and the voltage of the polling signal disappears not only in the sensor line 5 ₄ but also in the sensor line 2 and the branched sensor lines 5 _1, ..., 5 ₃ . Therefore, the short circuit detection circuit section A ₂ of each of the isolators 4 _1, ..., 4 ₄ detects a line short circuit and inputs a signal indicating that the line short circuit has been detected to the input port PORT 1 of the control circuit section B. Then, the control circuit section B outputs a pulse signal for turning on the switch circuit F ₂ from the output port PORT3.
Then, the switch circuit F ₂ has a 2-winding latching relay G
Since the terminal G _{5 of the above} is momentarily grounded to excite the reset winding G _r , each switching segment of the two-winding latching relay G is inverted, and each isolator 4 _1, ..., 4 ₄ has its own first terminal. The L _{1 and} C ₁ side is disconnected from the second terminal L _{2 and} C ₂ side of itself.

Then, the voltage of the polling signal on the sensor line 2 can be restored, and each isolator 4 can be restored.
_When the polling signal of its own unique address is received by the receiving circuit unit A _{4 , the} ... _1, 4 ₄ sends its own number to the fire receiver ₁ from the reply circuit unit A ₁ via the sensor line 2. It returns that the 1 terminal L _1, C ₁ side and the second terminal L _2, C ₂ side of itself are in the state of being disconnected at present. Therefore, in the fire receiver 1, each of the isolators 4 _1, ..., 4 ₄ is currently shutting off between its own first terminal L _1, C ₁ side and its own second terminal L _2, C ₂ side. Recognize that it is in a state.

Then, the fire receiver 1 includes the control command in the polling signal, so that the isolator 4 _1, ...
In the order of 4 ₄ , the disconnection between the self first terminal L _1, C ₁ side and the self second terminal L _2, C ₂ side is sequentially released. Then, when the disconnection between the self-first terminal L _1, C ₁ side of the isolator 4 _{4 and} the self-second terminal L _2, C ₂ side is released, the sensor line 2 and the branched sensor are connected. The voltage of the polling signals on the lines 5 _1, ..., 5 ₄ disappears, and the respective isolators 4 _1, ..., 4 ₄ have their own first terminals L _1, C ₁ side and their own second terminals L _2, C as described above. The voltage of the polling signal of the sensor line 2 is restored again because the connection between the _two sides is cut off.

Therefore, the fire receiver 1 includes the isolator 4
By recognizing that a line short circuit has occurred in the sensor line 5 ₄ that is branched via ₄ and including a control command in the polling signal, the other isolators 4 _1, ... 4 other than the isolator 4 ₄ are included. About _3's own first terminal L _1, C
The disconnection between the ₁ side and the second terminal L _2, C ₂ side of itself is released. Therefore, not enough to interconnect In the monitoring system flow diagram, if sensor lines 5 ₄ the system down of the whole even system by the resulting line short as shown in FIG. 4, sensor lines 5 ₄ It can be done with only down.

Next, monitoring of the wiring system diagram as shown in FIG.
Describe the system. Wiring system as shown in Figure 5
In the monitoring system shown in the figure, the fire receiver 1 is turned on.
When turned on, the fire receiver 1 will first connect to the detector line 2.
The ring signal is output and the isolator 4₁Power to
Isolators 4₁Is polling including control signals
Switch circuit F from output port PORT2 based on signal₁
It outputs a pulse signal that turns on the_1,C
₁Side and self second terminal L_2,C_TwoRelease the disconnection between
You. Then, the polling signal from the fire receiver 1 is
Sensor 3_1,… 3 _ThreeAnd isolator 4_TwoAnd transmitted to
And the isolator 4_TwoPower is supplied to the
Isolator 4_TwoIs based on the polling signal including the control signal.
Then switch circuit F from output port PORT2₁Turn on
Output a pulse signal that outputs its own first terminal L_1,C₁Side and self
My second terminal L_2,C_TwoRelease the block from the side. Do
Moreover, the polling signal from the fire receiver 1 is detected by the detector 3
_Four,… 3₆And isolator 4 _ThreeTo be transmitted to
Become isolator 4_ThreePower to the isolator
Type 4_ThreeOutput based on polling signals including control signals.
Switch circuit F from power port PORT2₁Pulse to turn on
Outputs a signal and outputs its own first terminal L_1,C₁Side and self second
Terminal L_2,C_TwoAs saying to release the disconnection with the side,
The reach of the polling signal from the fire receiver 1 is sequentially
Expands and polling signals spread throughout the system
Become so.

[0022] Then, each of the sensor 3 _1, ... is the fire presence state around the self, each of the isolators 4 _1, ...
Is on its own first terminal L _1, C ₁ side and its own second terminal L _2, C ₂
The presence / absence of interruption with the side is returned to the fire receiver 1 via the detector line 2 and the detector lines 7 _1, 7 _2, ...

Here, for example, if a line short circuit occurs in the sensor line 7 ₂ , the effect of this short circuit will spread and the sensor line 7 ₂ will be affected.
₂ as well as sensor line 2 and sensor line 7 _1, 7 _3, 7
_4, the voltage of the polling signal disappears. Therefore, the short circuit detection circuit section A of each isolator 41 _, ...
₂ detects a line short circuit and inputs a signal indicating that the line short circuit has been detected to the input port PORT1 of the control circuit section B. Then, the control circuit section B outputs a pulse signal for turning on the switch circuit F ₂ from the output port PORT3. Then, since the switch circuit F ₂ momentarily grounds the terminal G ₅ of the two-winding latching relay G to excite the reset winding G _r , each switching segment of the two-winding latching relay G is inverted,
Each isolator 4 _1, ..., 4 ₄ has its own first terminal L
_{The 1,} C ₁ side is disconnected from the second terminal L _2, C ₂ side of itself.

[0024] Then, the voltage of the polling signal sensor lines 2 can be restored, the isolator 4 _1, the polling signal unique address of the self is received by the receiving circuit section A _4, return circuit portion A _{From 1} to the fire receiver 1 via the sensor line 2, the current between the first terminal L _1, C ₁ side of itself and the second terminal L _2, C ₂ side of itself is currently cut off. Reply that there is. Therefore, the fire receiver 1 recognizes that the isolator 4 ₁ is currently in a state of disconnecting between its own first terminal L _1, C ₁ side and its own second terminal L _2, C ₂ side. Then, by including the control command in the polling signal, the disconnection between the self-first terminal L _1, C ₁ side of the isolator 4 _{1 and} the self-second terminal L _2, C ₂ side is released.

Then, the detector line 7₁Polling signal
Voltage can be restored and the isolator 4_TwoIs self
The polling signal of my own address is the receiving circuit A_FourTo
When received by the reply circuit section A₁To fire receiver 1
Shi detector line 7₁And the sensor line 2
1 terminal L_1,C₁Side and self second terminal L_2,C_TwoBetween the side
Reply that the status is currently blocked. There fire
Disaster receiver 1 is an isolator 4_TwoHas its own first terminal L_1,
C₁Side and self second terminal L_2,C_TwoCurrently cut off between
The polling signal.
Isolator 4 by including your command_TwoOf the self
First terminal L_1,C₁Side and self second terminal L _2,C_TwoBetween the sides
Unblock the.

Then, since the sensor line 7 ₂ is short-circuited, the first terminal L _1, C of its own of the isolator 4 ₂ is connected.
When you unblock between ₁ side and the second terminal L _2, C ₂ side of the self, the voltage of the sensor lines 2 and sensor lines 7 ₁ polling signal disappears, each of the isolator in the same manner as described above 4 _1, 4 ₂ voltage again sensor lines 2 of the polling signal so interrupting the connection between the first terminal L _1, C ₁ side and the second terminal L _2, C ₂ side of the own self returns.

Therefore, the fire receiver 1 includes the isolator 4
Recognizes that caused the line short-circuit in the sensor lines 7 ₂ connected to the _second output side, by including a control command to the polling signal, the first terminal L ₁ of the self for the isolator 4 _1, C ₁ to unblock between the second terminal L _2, C ₂ side of the side and self. Therefore, in the monitoring system of the wiring system diagram as shown in FIG. 5, if sensor lines 7 ₂
Even if a line short circuit occurs, the entire system does not go down and the sensor line 7 ₂ or later can be down.

[0028]

However, in the isolator as described above, there is a distinction between the input side and the output side, that is, the directivity, so that caution is required when wiring. Also, in the isolator described above, since there is directional, subjected to loop wiring sequentially feeding wiring as shown in FIG. 5, if the resulting line short circuit for example sensor lines 7 _2, sensor The line 7 ₂ is separated by the isolator 4 ₂ and the isolator 4 _{3 so} that the polling signal is transmitted clockwise to the sensor line 7 ₁ and the polling signal is transmitted counterclockwise to the sensor line 7 _3. can not, can not be minimized a section of transmission disabled the sensor lines, there arises a problem that disables the transmission of the polling signal over all sensor lines of sensor lines 7 ₂ and later.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a non-directional line demultiplexing device which does not distinguish between an input side and an output side. It is in.

[0030]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an invention according to claim 1 in which a sensor line for power supply and signal extending from a monitoring device of a monitoring system is appropriately inserted. The sensor line is divided into a plurality of sections, and the drive voltage obtained by rectifying the electric power supplied from the sensor line by the rectifier circuit detects the short circuit of the sensor line and the section that short-circuits is separated by the separating means. In the line separation device that disconnects to prevent the system from going down and sends a reply signal indicating that the sensor line has been disconnected to the monitoring device, non-directional means for eliminating the distinction between the input side and the output side is provided. And

According to a second aspect of the invention, the non-directional means is the rectifying circuit provided in front of and in the rear of the separating means.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a line separation device according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is an internal circuit block diagram showing a line separation device. FIG. 2 is an explanatory diagram showing how to use the line separation device. FIG. 2 (a) shows a wiring system diagram of a monitoring system using the line separation device, and FIG. 2 (b) shows how to switch signal paths of the monitoring system. It is an explanatory chart shown. 1 and 2
In the above, since the same parts as those described in the conventional technique are designated by the same reference numerals, detailed description of the same parts will be omitted.

As shown in FIG. 1, it corresponds to a line separation device.
The isolator 4 is different from the conventional isolator.
Is the first terminal L_1,C₁Diode bridge between
D₁Not only the second terminal L_2,C_TwoAlso in phase with the rectifier circuit
Corresponding diode bridge D _TwoAnd the conventional
Isolator diode D_aInstead of diode D_b,D
_cIs provided.

The positive output of the diode bridge D ₂ is connected to the positive output of the diode bridge D ₁ . The negative output of the diode bridge D ₂ is grounded. Also, the anode of the diode D _b is at the first terminal C ₁ , and the anode of the diode D _c is at the second terminal C 1.
₂ , each connected. Furthermore, the diodes D _b, D
The cathode of _c is connected to the other end of the receiving circuit section A ₄ .

Therefore, the isolator 4 shown in FIG.
The short circuit detection circuit section A_TwoThat a short circuit has been detected by the
Signal to the input port PORT1 and the control circuit block B switches.
H circuit F_TwoOutput pulse signal to turn on port PORT3
The reset winding G of the two-winding latching relay G
_rTo excite the terminal G_2,G_ThreeAnd terminal G_7,G₈Pause
Each turn on and terminal G_3,G_FourAnd terminal G_8,
G₉The first terminal L of its own_1,C₁Side and
Own second terminal L_2,C_TwoWhen I cut off from the side
However, the first terminal L_1,C₁Side or second terminal L_2,C_Two~ side
If the polling signal reaches any of the
Road A₁And short circuit detection circuit A_TwoAnd power circuit section A_ThreeAnd receive
Circuit part A_FourAnd control circuit section B, electrolytic capacitor E and switch
H circuit F _1,F_TwoAnd the 2-winding latching relay G
Can operate.

That is, in the isolator 4 shown in FIG. 1, there is no distinction between the input side and the output side, and the first terminals L _1, C ₁ side may be connected to the fire receiver 1 side corresponding to the monitoring device. Even if the second terminals L _{2 and} C ₂ are connected to the fire receiver 1 side corresponding to the monitoring device, the same operation as the isolator described in the related art can be performed, and the sensor line that has caused the line short circuit One of the diode bridges D _{1 and} D ₂ can prevent the adverse effect of (1) from affecting the entire sensor line and causing the system to go down.

Therefore, as shown in FIG. 2 (a), the sensor line 2 extending from the fire receiver 1 is connected to the isolator 41 _, ...
Is sequentially divided into a plurality of lines using the wiring, and the fire receiver 1 is wired in a loop. Then, in the fire receiver 1, as shown in FIG. 2B, at normal times, the detector line switch SW ₁ and the terminating resistor connection switch SW ₂ are turned on and the reverse rotation detector line switch SW is turned on.
Turn off ₃ .

Here, for example, if a line short circuit occurs at point P in FIG. 2A, the fire receiver 1 will use the second terminal L _2, of the isolator 4 _n-2 as described in the conventional art _. C
Recognizing that a short circuit has occurred in the sensor line on the _2nd side,
As shown in FIG. 2B, the detector line switch SW ₁ is kept on and the reverse rotation detector line switch SW is turned on.
₃ is turned on and the terminating resistor connecting switch SW ₂ is turned off. After that, the fire receiver 1 receives the polling signal including the control command and only in the isolator 4 _n-1 and the isolator 4 _n-2 , the first terminal L _1, C ₁ side of itself and the second terminal L _{2, of its} own _. Control to cut off between the C ₂ side and, in the case of another isolator, cut off between the own 1st terminal L _1, C ₁ side and the 2nd own terminal L _2, C ₂ side. To do.

That is, in the isolator 4 shown in FIG. 1, there is no distinction between the input side and the output side, and the first terminals L _1, C ₁ side may be connected to the fire receiver 1 side corresponding to the monitoring device. Even if the second terminals L _{2 and} C ₂ are connected to the fire receiver 1 side corresponding to the monitoring device, the same operation as the isolator described in the related art can be performed, and the sensor line that has caused the line short circuit fire that the adverse effects entire system extends to all sensor lines resulting in system down, can be blocked by either a diode bridge D _1, D _2, a plurality of isolators 4 _1, ... using The detector line 2 extending from the receiver 1 is sequentially divided into a plurality of lines by sending wires and wired in a loop with respect to the fire receiver 1 so that the detector 3 _a connected to one section where a short circuit occurs _, 3 _b, 3 _All you have to do is disable _c . That is, it is possible to minimize the number of sensors that are disabled.

In the line separation device of the above embodiment, not only the loop-shaped wiring as shown in FIG. 2 (a) but also the conventional technique described with reference to FIG. 4 and FIG. It goes without saying that the sensor line can also be divided.

[0041]

According to the invention described in claim 1, there is no need to consider the distinction between the input side and the output side when connecting, and it is easy to use. Moreover, a plurality of sensor lines extending from the monitoring device are sequentially fed by wiring. By arranging in a loop and wiring in a loop with respect to the monitoring device, it is only necessary to disable the sensor connected to one section where the short circuit has occurred, that is, the sensor to be disabled. It is possible to provide an excellent line separation device that can be minimized.

According to the invention described in claim 2, the effect of the invention described in claim 1 can be provided easily and inexpensively, and an excellent line separation device can be provided.

[Brief description of drawings]

FIG. 1 is an internal circuit block diagram showing a line separation device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing how to use the line separation device.

FIG. 3 is a block diagram of an internal circuit showing a conventional line separation device.

FIG. 4 is a wiring system diagram of a monitoring system for explaining a conventional line separation device.

FIG. 5 is a wiring system diagram of a monitoring system for explaining a conventional line separation device.

[Explanation of symbols]

1 Monitoring device 2 Sensor line 4 Line separation device D ₁ rectifier circuit (non-directional means) D ₂ rectifier circuit (non-directional means)

Claims (2)

[Claims] 1. A sensor line for power supply and signal extending from a monitoring device of a monitoring system is appropriately inserted to divide the sensor line into a plurality of lines, and electric power supplied from the sensor line is rectified by a rectifying circuit. The drive voltage detects a short circuit in the sensor line and separates the shorted section with a separating means to prevent the system from going down, and a line separation that sends back a reply signal indicating the disconnection of the sensor line to the monitoring device. A line separation device, characterized in that the device is provided with non-directional means for eliminating the distinction between the input side and the output side. 2. The line separating device according to claim 1, wherein the non-directional means is the rectifying circuit provided in front of and in rear of the separating means.