JP3050265B2 - Sensor inspection control device, sensor inspection system and abnormality monitoring system using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor inspection control device for inspecting a plurality of sensors connected in parallel between a pair of lines, a sensor inspection system using the same, and an abnormality having a sensor inspection function. Related to monitoring systems.

[0002]

2. Description of the Related Art Conventionally, an abnormality monitoring system of the type shown in FIG. 13, for example, a fire alarm system has been known. This abnormality monitoring system has a configuration in which a plurality of sensors 2-1 to 2-n and a terminator 53 are connected in parallel between a pair of lines PC and PL extending from a receiver 51.

Here, the receiver 51 is, for example, a P-type receiver. Each of the sensors 2-1 to 2-n is, for example, an ion type smoke sensor, and has a terminal 2C connected to the line PC, a terminal 2L connected to the line PL, and a pseudo function test ( (For example, a sensitivity test) and an input terminal 2X for performing an abnormality such as a fire.
Although the terminal 2C and the terminal 2L are in a disconnected state, when an abnormality is detected, the terminal 2C and the terminal 2L are configured to be in a conductive state. Further, when a predetermined voltage is applied to the input terminal 2X, the terminal 2C and the terminal 2L are configured to conduct. Further, the terminator 53 is adapted to have a predetermined impedance Z _1.

In such a system, during normal operation, a predetermined potential difference is provided between the line PC and the line PL, and the receiver 51 monitors the current flowing between the line PC and the line PL. However, when the impedance between the line PC and the line PL is maintained in a high impedance state, it is determined that none of the sensors 2-1 to 2-n has detected an abnormality. When the impedance with the line PL decreases, it can be determined that one of the plurality of sensors 2-1 to 2-n has detected an abnormality.

In such a system, in order to check the function (for example, sensitivity) of each of the sensors 2-1 to 2-n, an input terminal 2X is provided for each of the sensors 2-1 to 2-n.
The test signal of a predetermined voltage is individually applied to the input terminal 2X of each of the sensors 2-1 to 2-n. That is, the lines PE-1 to PE-1 are individually connected to the respective input terminals 2X of the sensors 2-1 to 2-n.
-N, for example, applying a test signal of a predetermined voltage to the line PE-1 to check the function of the sensor 2-1;
A test signal of a predetermined voltage is given to the line PE-2,
-2 function was checked.

[0006]

However, in an abnormality monitoring system of the type described above in which, for example, an ion type smoke detector is connected to a P-type receiver, each of the detectors 2-1 to 2-2 is connected.
-N to check the function of each sensor 2-1 through 2-n
Wiring must be provided individually for each, and there has been a problem that the system configuration becomes complicated.

Conventionally, for example, Japanese Patent Application Laid-Open No. 49-9 / 1979
As disclosed in Japanese Utility Model Publication No. 1797 and Japanese Utility Model Publication No. 57-30716, there is also known a system in which a plurality of sensors connected in parallel to a pair of lines are automatically checked. In addition to the pair of tracks, a separate inspection track was required.

Specifically, in the system disclosed in Japanese Patent Application Laid-Open No. 49-97797, in addition to a pair of lines (common line, signal line) to which a plurality of terminal devices (fire detectors) are connected in parallel, , A forward line is separately provided, and a pulse is sequentially transmitted to each terminal device (fire detector) via the forward line,
Each terminal (fire detector) is checked sequentially.

In the system disclosed in Japanese Utility Model Publication No. 57-30716, a test signal is sequentially transmitted to an adjacent ion-type smoke detector in addition to a pair of lines in which a plurality of ion-type smoke detectors are connected in parallel. A line for switching and applying the voltage is separately provided, and the latching relay is energized through the separately provided line, so that the inspection operation of the ion type smoke detector is sequentially performed.

As described above, the conventional system as described above has a problem that a separate signal line must be provided for checking a plurality of sensors connected in parallel between a pair of lines. there were.

According to the present invention, a plurality of sensors connected in parallel between a pair of lines are provided without separately providing a new line.
An object of the present invention is to provide a sensor inspection control device capable of sequentially performing test inspections in an existing state, a sensor inspection system using the same, and an abnormality monitoring system.

[0012]

In order to achieve the above object, according to the present invention, a novel sensor inspection control device is devised, and the sensor inspection is performed using the sensor inspection control device. It has become.

The sensor inspection control device according to any one of claims 1 to 3 is connectable to the same line as the pair of lines to which the sensor is connected, and changes in characteristics according to the voltage polarity of the pair of lines. When the impedance of the output terminal side decreases in a state where the voltage polarity of the pair of lines is a predetermined polarity, the output terminal side is disconnected, and
It has a function to generate a test signal necessary to check the sensor.

In the sensor inspection system and the abnormality monitoring system according to the fourth to tenth aspects, the sensor inspection control devices are provided between adjacent sensors, respectively. When the voltage polarity of the pair of lines becomes a predetermined polarity and the impedance at the output end decreases, the output end is disconnected, a test signal is supplied to the input terminal of the nearest sensor at the input end, and a plurality of sensors are detected. The function test is performed sequentially from the end of the pair of lines. Thereby, without separately providing a new line, a plurality of sensors connected in parallel between a pair of lines,
Testing and inspection can be performed sequentially in the existing state.

[0015] In particular, the invention according to claims 5 and 9 is
At an end of the pair of lines, trigger means (terminator) whose impedance changes according to the voltage polarity of the pair of lines is further provided, and the trigger means (terminator) and the trigger means
The sensor inspection control device is further provided between the sensor adjacent to the (terminator), the voltage polarity of the pair of lines becomes a predetermined polarity, and the impedance of the trigger means (terminator) decreases. Sometimes, the latest sensor inspection control device is
The output end is disconnected, and a test signal is applied to the input terminal of the sensor nearest to the input end to start the inspection operation. Thus, when the voltage polarity of the pair of lines is set to a predetermined polarity, the inspection operation can be automatically started by the trigger means (terminator).

According to a sixth aspect of the present invention, in the state where the voltage polarity of the pair of lines is a predetermined polarity, the sensor normally operates and the sensor inspection control device immediately adjacent thereto is provided. By disconnecting the output end side, a pulse signal is generated on a pair of lines immediately before the disconnection, and by counting the number of the pulse signals, a malfunction detector can be detected from a plurality of sensors. Is to be identified. This makes it possible to immediately know which of the plurality of sensors has a malfunction.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of an abnormality monitoring system according to the present invention. Referring to FIG. 1, the abnormality monitoring system includes a pair of lines PC, PL extending from a receiver 1.
A plurality of sensors 2-1 to 2-n are connected in parallel, and a terminator 3 is connected to the ends of the pair of lines PC and PL.

Here, the abnormality monitoring system of FIG.
It is assumed that the type is the same as the type of the abnormality monitoring system shown in FIG. 3, and therefore, for example, a P-type receiver is used as the receiver 1. Further, for each of the sensors 2-1 to 2-n, the same sensor as that used in FIG. 13 is used. That is, each of the sensors 2-1 to 2-n
Has a terminal 2C connected to the line PC, a terminal 2L connected to the line PL, and an input terminal 2X for performing a pseudo function test (for example, a function test of operation and sensitivity). If you do not detect any abnormalities such as fire,
Although the terminal 2L and the terminal 2L are disconnected from each other, when an abnormality is detected, the terminal 2C and the terminal 2L are electrically connected. Further, when a predetermined voltage is applied to the input terminal 2X, the terminal 2C and the terminal 2L are configured to conduct.

FIG. 2 shows a test object (inspection object) in the present invention.
FIG. 3 is a diagram illustrating a configuration example of a sensor to be used. In the example of FIG. 2, the sensor is an on / off type sensor, and includes a detection unit 6 for detecting an abnormal phenomenon such as smoke and heat, and a detection unit 6 that detects no abnormality and detects an abnormality. Is off when the level of the detection signal is smaller than the predetermined reference value (a high impedance state is established between the terminals 2C and 2L), the detection unit 6 detects an abnormality, and the level of the detection signal exceeds the predetermined reference value. And a switch circuit 7 that is turned on when the power supply voltage is larger than the threshold value (makes a low impedance state between the terminal 2C and the terminal 2L). Further, the sensor of FIG. 2 is configured so that a test signal is applied to the detection unit 6 from the terminal 2X, and when a test signal of a predetermined voltage ΔV is applied to the terminal 2X, the detection unit 6 performs the same operation as when an abnormality is detected. A level detection signal is output.

FIG. 3 is a diagram showing a specific example of the sensor having the structure shown in FIG. Referring to FIG. 3, the sensor is a ion-type smoke sensor, an internal ion chamber CH ₁ which is ionized by the radiation source, an external ion chamber CH ₂ capable smoke intrusion, within the ion chamber CH ₁ and external ion chamber C
It comprises a field effect transistor F for impedance-converting the voltage at the point of connection with H ₂ , a resistor R ₄₁ for extracting the output of the field effect transistor F, and a thyristor S for short-circuiting between the terminals 2 L and 2 C by the output of the transistor F. Have been. Here, an input terminal used to terminals 2X drawn from the point of attachment to the external ion chamber CH ₂ and the resistor R ₄₂ to test the operation and sensitivity of the ionization-type smoke sensor, at the time of the test, the terminal Voltage is applied between 2C and 2X
(I.e., the test signal of a predetermined voltage ΔV is applied to the input terminal 2X), equivalently to the same state as the smoke intrudes into the external ion chamber CH _2, the voltage of the gate electrode of the transistor F based on the decrease of the ion current The operation and sensitivity can be tested with the same effect as increasing

In this embodiment, FIG. 13 shows that another line is required in addition to the pair of lines to check the sensors 2-1 to 2-n as described above. To solve problems in such anomaly monitoring systems,
Further, it is intended to automatically perform inspection of each of the sensors 2-1 to 2-n. For this reason, in the abnormality monitoring system of FIG. 1, between the adjacent sensors, and between the sensors 2-n
Inspection controllers 4-1 to 4-n for sequentially and automatically inspecting the sensors 2-1 to 2-n are further provided between the terminal device 3 and the terminator 3.

FIG. 4 is a block diagram of the inspection control unit 4-i (1 ≦ i ≦ n). Referring to FIG. 4, the inspection control unit 4-i
Has an input terminal 4C _in and an output terminal 4C _out on the side connected to the line PC, and has
Has an input terminal 4L _in and the output terminal 4L _out, also,
Has a terminal 4X to be connected to the input terminal 2X of sensors, the conducting portion 11 for conducting between the terminals 4C _in a 4C _out when the line PL is positive with respect to line PC,
When the line PC is positive with respect to the line PL,
Low impedance state between output terminals (4C _out , 4L _out )
An isolator unit 12 that disconnects the output end when a short circuit occurs, for example, and a test signal generator 13 that is activated by the isolator unit 12 and outputs a test signal of a predetermined voltage ΔV from a terminal 4X.

In other words, the inspection control unit 4-i determines the polarity of the voltage applied between the line PC and the line PL according to
5 according to the state of the output terminals (4C _out , 4L _out ).
As shown in (a) to (c), the polarity is changed.

That is, when the line PL has a positive polarity with respect to the line PC, the inspection control unit 4-i performs the operation shown in FIG.
, The input terminal (4C _in , 4L _in ) and the output terminal (4C _out ,
4L _out ), a signal is simply transmitted and received, and the circuit functions as if it were not provided.

When the line PC is positive with respect to the line PL and a low impedance state (for example, a short circuit state) is present between the output terminals (4C _out and 4L _out ) (when the load on the output terminal becomes abnormally large). 5), functions as an isolator for automatically disconnecting the output end side as shown in FIG. 5B, and at this time, functions to output a test signal of a predetermined voltage ΔV to the terminal 4X.

Also, when the line PC has a positive polarity with respect to the line PL and the output terminal (4C _out , 4L _out ) is in a high impedance state, as shown in FIG.
X functions so that a signal of a sufficient voltage is not output.

FIG. 6 is a block diagram of the terminator 3. 6, the terminator 3 includes a terminal 3C _in connected to the line PC and a terminal 3L _in connected to the line PL.
When the line PL is positive with respect to the line PC, a predetermined impedance Z is provided between the terminals 3C _in and 3L _in.
When the line PC is positive with respect to the line PL, an impedance switching unit 15 is provided to bring the terminals 3C _in and 3L _in into a low impedance state (short circuit state).

In other words, the terminator 3 has the polarity of the voltage applied between the line PC and the line PL corresponding to the provision of the inspection control unit 4-i on the pair of lines PC and PL. Accordingly, as shown in FIGS. 7A and 7B, the polarities change in impedance. That is,
When the line PL is positive with respect to the line PC, the terminator 3 includes the terminal 3C _in and the terminal 3L _{in as} shown in FIG.
And has a predetermined impedance Z ₁ (for example, the same impedance as the terminator 53 in FIG. 13), while the line PC is positive with respect to the line PL,
Terminator 3, as shown in FIG. 7 (b), the terminal 3C _in the terminal 3
Between the L _in a low impedance state (for example short-circuit state)
It works so that it becomes.

Next, the operation of the abnormality monitoring system having such a configuration will be described. Each of the sensors 2-1 to 2
When a conventional on / off type sensor as shown in FIGS. 2 and 3 is used for −n, the on / off type sensor is generally polar, and the terminal 2L is always kept at a higher potential than the terminal 2C. In this case, the operation is performed when the line PL is made positive with respect to the line PC.
In the case where the inspection function operation is performed when the line PC is made positive with respect to the line PL, both when the line PL is positive and when the line PC is positive (that is, when the line P
Regardless of the polarity of the voltage applied between C and the line PL),
It is necessary to operate the sensor correctly, in this case,
Each of the sensors 2-1 to 2-n connected between the pair of lines PC and PL needs to be non-polar. Below,
When used in an abnormality monitoring system, the sensors 2-1 to 2-n having polarity are apparently non-polar, so that the sensors 2-1 to 2-n are conventionally known. It is assumed that n is connected to a pair of lines PL and PC via a diode bridge (not shown).

In the case of a normal monitoring operation, the receiver 1
The line PL is held at a positive polarity with respect to the line PC. In this case, the terminator 3 is in the state shown in FIG. That is, the impedance is the same as that of the terminator 53 in the system of FIG. Further, each of the inspection control units 4-1 to 4-n is in the state shown in FIG. Therefore, during a normal monitoring operation, the system of FIG. 1 is similar to the system of FIG.
When the current flowing between the line PC and the line PL is maintained in a high impedance state, any of the sensors 2-1 to 2-n has detected an abnormality. On the other hand, if the impedance between the line PC and the line PL decreases, it can be determined that any of the sensors 2-1 to 2-n has detected an abnormality.

On the other hand, at the time of the inspection function operation, the receiver 1 holds the line PC at a positive polarity with respect to the line PL. In this case, all the inspection control units 4-1 to 4-n initially
In the state shown in FIG. 5C, the line PC has a positive polarity with respect to the line PL, and the terminator 3 is in the state shown in FIG. 7B. When the low impedance state is established between the output terminals (4C _out , 4L _out ) of 4-n, the inspection control unit 4-n switches from the state shown in FIG.
(b), the output end, that is, the terminator 3 is automatically cut off, and a test signal of a predetermined voltage ΔV is output from the terminal 4X and given to the input terminal 2X of the sensor 2-n.
The sensor 2-n is checked and activated.

That is, in this case, the system of FIG.
When the function of the detector 2-n is normal, a predetermined voltage ΔV is applied to the input terminal 2X.
, The sensor 2-n operates normally, and the terminals 2C and 2L become conductive, and
The impedance between the line PC and the line PL decreases. On the other hand, when the function of the sensor 2-n is not normal (when it is abnormal), the sensor 2-n does not operate and the impedance between the line PC and the line PL remains high.

When the function of the sensor 2-n is normal and the terminals 2C and 2L are electrically connected, the inspection control unit 4- (n-1) immediately before the sensor 2-n. ) Is in the low impedance state between the output terminals (C _out , L _out ). As a result, next, the inspection control unit 4- (n-1) changes from the state shown in FIG. 5C to the state shown in FIG.
That is, the sensor 2-n to the terminator 3 are automatically disconnected,
In addition, a test signal of a predetermined voltage ΔV is output from the terminal 4X and given to the input terminal 2X of the sensor 2- (n−1),
(n-1) is similarly inspected. That is, in this case, the system shown in FIG. 1 is equivalent to the system shown in FIG.

As described above, in each inspection control unit 4-i, the sensor 2- (i + 1) at the output end operates normally and the output terminal (4C
_out , 4L _out ), when a low impedance state is established, a test signal of a predetermined voltage ΔV is supplied to the sensor 2-i at the input end to perform a check operation of the sensor 2-i. The plurality of sensors 2-1 to 2-n connected in parallel between PC and PL start with the sensor 2-n farthest from the receiver 1 and start with the sensor 2 closest to the receiver 1.
The inspection operation can be performed sequentially up to -1.

Now, when the functions of all the sensors 2-1 to 2-n are normal, each of the sensors 2-1 to 2-n
-N is a signal from the sensor 2-n to the sensor 2 within a certain time T.
All sensors up to -1 are activated sequentially. On the other hand, if any one of the sensors 2-1 to 2-n has a malfunction, for example, if the function of the sensor 2- (i + 1) is abnormal and does not operate, Since the output terminal of the inspection control unit 4-i does not enter the low impedance state, the sensor 2-i at the input terminal of the inspection control unit 4-i is not operated for inspection, and the inspection operation is stopped at this point. As a result, the sensor 2-1 closest to the receiver 1 is not activated.
Therefore, when the line PC is made positive with respect to the line PL
If the receiver 1 is provided with a function of determining whether or not the sensor 2-1 closest to the receiver 1 operates within a certain time T from the (starting time of the inspection), the detector 2- 1 does not operate, the receiver 1 recognizes that the function of any of the sensors 2-1 to 2-n is not normal (function is abnormal) and outputs a test result to that effect. it can. In addition,
The above-mentioned fixed time T from the start of the inspection is equal to a pair of track P
C, the number of sensors connected to the line PL, and the time required for the sensor to operate after a test signal is applied when the sensor is functioning normally (sensor test time). It is set based on the number and the maximum sensor test time for each sensor.

Also, in this case, when the sensor 2- (i + 1) operates and the impedance between the terminals (2C, 2L) of the sensor becomes low (conduction state), an operating current is applied to the pair of lines PC and PL. At this time, the inspection control unit 4-i immediately functions as an isolator, and this operating current is transmitted as a predetermined pulse signal from the pair of lines PC and PL to the receiver 1. Therefore, the receiver 1 has a function of counting the number of predetermined pulse signals propagating from the pair of lines PC and PL.
The receiver 1 counts the number of predetermined pulse signals sent from the pair of lines PC and PL to identify a malfunctioning sensor from the plurality of sensors 2-1 to 2-n. can do.

That is, the receiver 1 counts the number of predetermined pulse signals transmitted via the pair of lines PC and PL from the start of the inspection, and counts a predetermined time T from the start of the inspection.
If it is determined that the sensor 2-1 closest to the receiver 1 is not operating within
It is possible to specify that the sensor at the number of the counted predetermined pulse signals counted from n is malfunctioning. For example, when the count result of the number of the predetermined pulse signals is m (≦ n), the receiver 1 can specify that the sensor 2- (nm−1) has a malfunction. However, at this time, the receiver 1 needs to be configured so that the function is not determined to be normal by receiving the pulse signal.

Next, a specific configuration example of the inspection control unit 4-i (1 ≦ i ≦ n), the terminator 3, and the receiver 1 will be described.
FIG. 10 is a diagram illustrating a specific configuration example of the inspection control unit 4-i. In the example of FIG. 10, the check control unit 4-i includes resistors _{R 11, R 12, R 13} , R 14, R 15, R 16, R 17, R 18, R
₁₉ , diodes D ₁₁ , D ₁₂ , D ₁₃ , D ₁₄ and transistors Q ₁₁ , Q ₁₂ , Q ₁₃ , Q ₁₄ .

In this configuration example, when the line PL is held at the positive polarity with respect to the line PC (when a normal monitoring operation is performed), the current flows from the line PL through the terminator 3 to the line PC.
And, on the line PC, the receiver 1
Flow towards the side. Therefore, the terminal 4 of the inspection control unit 4-i
In between the C _out and 4C _in, current flows from the 4C _out to 4C _in. Incidentally, the check control unit 4-i in FIG. 10, the diode D ₁₄ is provided on the current path towards the 4C _out to 4C _in, current, all terminal 4C
It flows from _out the terminal 4C _in through the diode D _14, check control unit 4-i is a state of FIG. 5 (a), the check control unit 4
This is similar to the case where i is not provided.

On the other hand, if the line PC is positive with respect to line PL is current flows through contrary to the above, no current flows through the diode D _14. In this case, the output terminal (4
When C _out, 4L _out) during the high impedance state, the check control unit 4-i in FIG. 10 is in a state as shown in FIG. 5 (c). That is, the voltage between the pair of lines PC and PL is usually, for example, 24 V, and therefore, the output terminals (4C _out ,
Assuming that the voltage between 4 L _out ) is 24 V, this voltage is divided by resistors R ₁₆ , R ₁₈ , and R ₁₉ , and the voltage across R ₁₉ is applied to the base of transistor Q ₁₄ . As the voltage across the R ₁₉ is the transistor Q ₁₄ is turned on without fail by being applied to the base of the transistor Q _14, when the dividing ratio of the resistors R _16, R _18, R ₁₉ is properly set , the output terminal (4C _out, 4L _out) while is not low impedance state, when this period of the voltage is 24V, the transistor Q ₁₄ is turned on by the voltage applied to the R _19. When Q ₁₄ is turned on, the base current of the transistor Q ₁₂ flows through the resistor R _15, the transistor Q ₁₂ is also turned on. At this time, the resistance 1
6 but is short circuited, even in this case, the base current of the transistor Q _12, so further flows toward the transistor Q _14, these on-state of the transistor Q _12, Q ₁₄ does not change. In this state, the transistor Q ₁₁
The base voltage, since the low potential because the transistor Q ₁₄ is turned on, an emitter follower output terminal of the transistor Q _11, i.e. a sufficient voltage as a test signal from the terminal 4X is not output.

On the other hand, when the line PC is positive with respect to the line PL, the output terminals (4C _out , 4L _out )
When the state becomes a low impedance state, the inspection control unit 4-i
Is in a state as shown in FIG. That is, the output terminal
(4C _out, 4L _out) if during becomes the low impedance state (e.g., short-circuit state), drops or near 0V 0V from this period of the voltage, for example 24V, the voltage across the resistor R _18, i.e. transistor Q ₁₄ base since voltage drops, the transistor Q ₁₄ is turned off from the on state, the transistor Q ₁₄ is that the oFF state, the transistor Q ₁₄ is also turned off. In this case, the current through the resistor R ₁₆ to the input terminal 4C _in the output terminal 4C
_out , so that the input terminal (4C
_in, line PC as viewed from 4L _in) side, the impedance of the PL is more than the resistance value of the resistor R ₁₆ of the very large. Therefore, between the input terminals (4C _in , 4L _in ), the output terminal side is released from the momentary short-circuit state, which is an overload state, and a normal voltage (for example, 24 V) is applied. That is, the inspection control unit 4-i enters a state of functioning as an isolator for separating the output end side. As a result, the transistor when the Q ₁₄ is turned off, the base of the transistor Q _11, the voltage of the input terminal (e.g., 24V) the resistor R _12, R
_The voltage ΔV divided by ₁₃ is applied as a base voltage, and this voltage ΔV is output from a terminal 4X as a test signal.

FIG. 11 is a diagram showing a specific configuration example of the terminator 3. As shown in FIG. In the example of FIG. 11, the terminator 3 has a capacitance C
impedance Z ₁ in which _el and the resistor R _el are connected in series.
Besides, corresponding to above-described functions of the check control unit 4-i, a low-impedance state and the terminal 3C _in the terminal 3C _out when the line PC is positive with respect to line PL of (short-circuit state) polar diode D _el to the, as the impedance switching unit 15 is provided in parallel with the impedance Z _1.

In this configuration example, when the line PL has a positive polarity with respect to the line PC, no current flows through the diode _Del and the impedance between the terminals 3C _in and 3C _{out of} the terminator 3 becomes the capacitance C _{Although the} impedance Z ₁ results from the series connection of the _el and the resistor R _el , when the line PC is positive with respect to the line PL, a current flows through the diode D _el and the voltage between the terminals 3 C _in and 3 C _{out of} the terminator 3 is low. It becomes an impedance state (short circuit state). Thereby, the state between the output terminals (4C _out , 4L _out ) of the immediately preceding inspection control unit 4-n is in a low impedance state.
(Short circuit state), and the automatic inspection operation can be started.

FIG. 12 is a diagram showing a specific configuration example of the receiver 1. In the example of FIG.
Is used in combination with the inspection control unit 4-i of FIG. That is, the receiver 1
Terminals 1C and 1L to which lines PC and PL are respectively connected
And a power supply unit 31 that outputs a voltage of, for example, 24 V, a disconnection pulse generator 32 that generates a disconnection pulse, a resistor R ₂₁ ,
_{R 22, R 23, R 24} , R 25, R 26, R 27, R 28, R 29, R
₃₀ , capacitors C ₂₁ and C ₂₂ , diode D ₂₁ , zener diode Z ₂₁ , transistors Q ₂₁ , Q ₂₂ , Q
_23, and Q _24, a switch 33 for switching between inspection test operation and monitoring operation, the monostable multivibrator 3
4, a gate G1 for outputting a line disconnection, a gate G2 for outputting an inspection test result, a gate G3 for outputting a monitoring result,
A counter 35 that counts a predetermined number of pulse signals; and a sensor specifying unit 36 that specifies a sensor (function number) of the malfunction based on the count value of the counter 35 when the inspection test result is abnormal. have.

In this configuration example, when the switch 33 is set to the monitoring operation side, the line PL becomes positive with respect to the line PC, and a normal voltage (24) is applied to each of the sensors 2-1 to 2-n.
V) can be supplied. If the line PL is positive with respect to the line PC, the system, as described above,
This is the same as when the inspection control units 4-1 to 4-n are not provided, and when any of the sensors 2-1 to 2-n detects an abnormality such as a fire and operates, the line PL and between the line PC becomes low impedance state, the potential of the line PL is reduced, the transistor Q via the diode D ₂₁
Flow is the base current of _24, the transistor Q ₂₄ is operated.
Incidentally, the Zener diode Z ₂₁ is for setting a voltage for detecting an abnormality detection operation of the detector,
Sensor is activated by detecting an abnormality (when the potential of the line PL is reduced a predetermined amount) when between the line PL and the line PC has a low impedance state, the transistor Q ₂₄ is operated in accordance with this Transistor Q ₂₄
Are provided to the emitters of

[0046] When the transistor Q ₂₄ operates, current flows from the transistor Q ₂₄ to the resistor R _28, the voltage V ₀ which predetermined size to the collector terminal CT of the transistor Q ₂₄ is generated by the resistor R _28. During the monitoring operation (in the same state as when the inspection control units 4-1 to 4-n are not provided),
Since the low impedance state generated between the pair of lines PL and PC due to one of the sensors 2-1 to 2-n detecting an abnormality and operating is continued for a predetermined time or more,
The voltage V ₀ generated at the collector terminal CT is not pulsed but continuous for a predetermined length or more. This voltage V ₀ is output from the inspection test result output gate G2 and the monitoring result output gate G3. And join. During the monitoring operation, since the switch 33 is set to the monitoring operation side, the mono-multi vibrator 34 is in a non-operation state,
Since the Q terminal has a logical value “0” and the * Q terminal has a logical value “1”, the gate G2 for outputting the inspection test result is always open (the output of the gate G2 is suppressed), and the monitoring result is obtained. Only the output gate G3 is closed. Therefore, when a voltage V ₀ that continues for a predetermined length or more is generated at the collector terminal CT, only the output of the gate G3 becomes “1”. As described above, when any of the sensors 2-1 to 2-n detects an abnormality such as a fire, the output of the gate G3 becomes "1",
An abnormality occurrence signal (for example, a fire occurrence signal) Y3 having a logical value “1” can be output from the gate G3.

The receiver 1 shown in FIG. 12 receives signals from the disconnection pulse generator 32 during the monitoring operation, that is, when the line PL is positive with respect to the line PC.
A pulse for detecting disconnection of L can be generated. When a disconnection detection pulse is generated, the potential of the line PL is temporarily reduced by the pulse. That is, the voltage supply to the line PL is temporarily interrupted. However, if the lines PC and PL are not disconnected, when the potential of the line PL decreases, the voltage (2) that has been charged in the capacitor _Cel of the terminator 3 in FIG.
4V); output by the discharge, the potential of the line PL is quickly returns to normal potential, the transistor Q ₂₄ is not operated. Incidentally, the check control unit 4-i of the transistor Q ₁₃ in FIG. 10,
It is provided for establishing a discharge path of the capacitor _Cel of the terminator 3 at this time.

On the other hand, if the lines PC and PL are disconnected, the voltage (24 V) charged in the capacitor _Cel of the terminator 3 in FIG. 11 even when the potential of the line PL decreases.
Is not discharged, and therefore, the potential of the line PL becomes low during the pulse generation period from the disconnection pulse generator 32. Thus, during this period, the transistor Q ₂₄ is operated, the voltage V ₀ which predetermined size to the collector terminal CT of the transistor Q ₂₄ is generated. This voltage V ₀ is applied to the gate G1 for line disconnection output, and becomes an output “1” of the gate G1 in synchronization with a pulse from the disconnection pulse generator 32. From the gate G1, a line of logical value “1” is output. The disconnection signal Y1 can be output. Even in occurrence of an abnormality such as a fire, the output from gate G1 for the line disconnection output is made by the voltage V ₀ generated in the collector terminal CT of the transistor Q _24, in order to prevent this, although not shown, a fire Means for stopping the operation of the disconnection pulse generator 32 during occurrence is provided separately.

When the switch 33 is set to the inspection test operation side, the line PC becomes a positive electrode with respect to the line PL,
The terminator 3 in FIG. 11 enters a low impedance state (short-circuit state) due to the diode _Del . Thereby, this terminator 3
Operates as an isolator, and a test signal of a predetermined voltage ΔV is input to the sensor 2-n.

When the function of the sensor 2-n is normal, a test signal of a predetermined voltage ΔV is applied to the input terminal 2X, so that the sensor 2-n operates normally. Output terminal of inspection control unit 4- (n-1) immediately before n
A low impedance state is set between (C _out , L _out ). As a result, the inspection control unit 4- (n-1) operates as an isolator, and a test signal of the predetermined voltage ΔV is input to the next sensor 2-n. When the functions of all the sensors 2-1 to 2-n are normal, the above-described operation is repeatedly performed in order to the sensor 2-1 closest to the receiver 1, and this sensor 2 When the test signal of the predetermined voltage ΔV is input from the inspection control unit 4-1 to −1, and the detector 2-1 operates normally, the impedance between the terminals (1C, 1L) of the receiver 1 becomes low.

In this way, each of the sensors 2-n to 2-1
If There sequentially to normal operation, a pair of lines PL as each detector is operated by the operating current flowing between the PC, the receiver 1, the base current of the transistor Q ₂₄ flows through the diode D _21, transistor Q ₂₄ operates, and a predetermined voltage V ₀ is applied to the collector terminal CT of the transistor Q _24.
Occurs. However, when the detectors 2-n to 2-2 operate, the inspection control units 4- (n-1) to 4-1 immediately function as an isolator. The operating current flowing through the pair of lines PC and PL becomes pulse-like, and therefore, the voltage V generated at the collector terminal CT.
₀ also become a thing of the pulsed resistor R _29, the time constant circuit of the capacitor C _22, not applied to the gate G2, G3. On the other hand, when the detector 2-1 closest to the receiver 1 operates, there is no inspection control unit functioning as an isolator. In this case, the operating current continuously flows for a predetermined time or more, so that the collector terminal Voltage V ₀ generated at CT
Also continue for a predetermined length or more, and the gates G2, G
3 each.

By the way, during the inspection test operation in which the line PC is held at the positive polarity with respect to the line PL, no pulse is generated from the disconnection pulse generator 32, and therefore, the gate G1
Is always "0". Further, the mono-multi vibrator 34 is in the ON state for a certain period T from the start of inspection, and during the period T in which the mono-multi vibrator 34 is in the ON state, the Q terminal has the logical value “1” and the * Q terminal has Since the logical value becomes “0”, the gate G for monitoring result output is output.
3 is always open (the output of the gate G3 is suppressed), and only the gate G2 for outputting the inspection test result is closed.

Therefore, within a predetermined period T from the start of inspection (during the period when the mono-multi vibrator 34 is in the ON state), the sensor 2-1 closest to the receiver 1 operates, and the transistor When the voltage V ₀ that persists for more than a predetermined length to the collector terminal CT of Q ₂₄ is generated, only the output of the gate G2 becomes "1". As described above, when the functions of all the sensors 2-1 to 2-n are normal, the output of the gate G2 becomes "1" within a predetermined period T from the start of inspection, and this is regarded as a test normal, and the gate G2 Can output a test normal signal Y2 having a logical value "1".

On the other hand, when the function of any of the sensors 2-1 to 2-n is abnormal, the above operation stops at the sensor having the functional abnormality and the receiver 1
Do not proceed to the detector 2-1 closest to By sensor 2-1 is not operating, the voltage V ₀ to continue to the collector terminal CT of the transistor Q ₂₄ a predetermined length or more in the receiver 1
Does not occur. Therefore, the output of the inspection test result output gate G2 does not become "1" within a predetermined time T from the start of the inspection (that is, during the period when the mono-multi vibrator 34 is in the ON state). As described above, when the test normal signal Y2 having the logical value "1" is not output from the gate G2 even after the lapse of the predetermined time T from the start of the test, the test is regarded as abnormal and the sensors 2-1 to 2-n It is possible to detect that either one is abnormal.

As described above, the inspection control unit 4-i
Immediately before operating as an isolator, a pair of lines P
A pulse-like operating current is generated between C and PL, and the receiver 1
Of the collector end CT of the transistor Q ₂₄ is, as each check control unit 4-i is operated as an isolator, a predetermined size of pulse voltage. The counter 35 counts the number of pulse voltages generated at the collector terminal CT and holds the count.

Now, for example, counting from the sensor 2-n farthest from the receiver 2-1, the m-th sensor 2- (nm)
When the function of +1) is abnormal, the inspection control unit 4-n
A pulse voltage is generated immediately before each of the signals through (n−m + 1) functions as an isolator.
After the (n-m + 1) operation, no pulse voltage is generated. Therefore, in this case, the count value of the counter 35 is m, and the counter 35 holds the count value m. Further, when the function of the sensor 2- (nm + 1) is abnormal, the test normal signal Y2 having the logical value "1" is not output from the gate G2 within a predetermined time T from the start of the test. Detected as a test abnormality. When the detection is performed as a test abnormality, the sensor specifying unit 36 captures the count value m held in the counter 35, and based on the count value m, the sensor having the function abnormality is determined as 2- (n −m + 1), which can be specified and output.

As described above, according to the present embodiment, basically, in a configuration in which a plurality of sensors are connected in parallel between a pair of lines PC and PL, each of the adjacent sensors has By additionally providing an inspection control unit for sequentially and automatically inspecting the sensors, a plurality of sensors connected in parallel between a pair of lines can be installed without installing a new line as in the related art. In the state, the test can be performed sequentially.

In an abnormality monitoring system of the type in which an analog sensor is connected to an R-type receiver, a plurality of analog sensors connected to a pair of lines can be called and inspected by polling from the receiver. In systems of the type in which, for example, an ionic smoke detector is connected to the type receiver, the call cannot be checked by polling from the receiver, and therefore the present invention is particularly applied to a system using a P-type receiver. Useful.

In the above example, the sensors 2-1 to 2-1
Although -n has been described as an ionic smoke detector having an input terminal for a functional test, the present invention provides a detector 2-
The same applies to the case where 1 to 2-n are sensors other than the ion type smoke detector. Specifically, in the photoelectric smoke detector, the heat detector, and the like, an input terminal for a function test corresponding to the input terminal for the function test of the ion smoke detector in FIG. 3 is provided, and a predetermined voltage is applied to the input terminal. When the test signal is inputted, if the impedance between the pair of line connection terminals is reduced, the present invention can be applied similarly to the case of the ion type smoke detector. Can be checked in exactly the same way. In the configuration example of FIG. 2, when the detector is an ion smoke detector or a photoelectric smoke detector, the detector 6 is an ion smoke detector or a photoelectric smoke detector. Is a heat sensor, the detection unit 6 is a heat detection unit using, for example, a heat-sensitive element. The configuration shown in FIG. 2 is merely an example of the configuration of the sensor. The sensor to be tested has an input terminal for inputting a test signal, and a test signal of a predetermined voltage is input to the input terminal. Any structure may be used as long as the impedance between the pair of line connection terminals decreases when input is made, and is not limited to the structure shown in FIG.

In the above-described embodiment, the case where the sensor is incorporated in the abnormality monitoring system having both the monitoring operation function and the inspection operation function has been described. The present invention can also be applied to a case in which a plurality of sensors are automatically tested in sequence without connecting a new line by connecting the above-mentioned sensors between a pair of lines. That is, the present invention can also be realized as a sensor inspection system having only a sensor inspection operation function. In this case, the sensor to be tested (generally a sensor having polarity) can be directly connected to the pair of lines PL and PC without using a diode bridge. That is, terminals 2L and 2C are connected to a pair of lines PL and PC.
All you have to do is connect them properly. In the above-described embodiment, when constructing the abnormality monitoring system, a pair of lines P
Although a sensor is connected to L and PC via a diode bridge, any means can be used without limitation to the diode bridge as long as the means makes the sensor seem nonpolar. Alternatively, the sensor itself may be non-polar.

In the above-described embodiment, a terminator is provided at the end of a pair of lines. However, in order to test each of the sensors 2-1 to 2-n sequentially, it is necessary to check What is necessary is just to make the control unit 4-n function as an isolator, and not only the terminator but also any trigger means can be used.

[0062]

As described above, according to the first to tenth aspects of the present invention, when a sensor inspection control device is provided between adjacent sensors, the sensor inspection control device includes: The voltage polarity of the pair of lines becomes a predetermined polarity,
When the impedance at the output end decreases, the output end is disconnected, a test signal is supplied to the input terminal of the nearest sensor at the input end, and the function test of the plurality of sensors is performed sequentially from the end of the pair of lines. Thus, a plurality of sensors connected in parallel between a pair of lines can be sequentially tested and inspected in an existing state without separately providing a new line.

In particular, according to the fifth and ninth aspects of the present invention, a trigger means (terminator) whose impedance changes in accordance with the voltage polarity of the pair of lines is further provided at the end of the pair of lines. The sensor inspection control device is further provided between the trigger means (terminator) and a sensor adjacent to the trigger means (terminator), and the voltage polarity of the pair of lines is predetermined. When the polarity is reached and the impedance of the trigger means (terminator) decreases, the nearest sensor inspection and control device disconnects the output end side and gives a test signal to the input terminal of the nearest sensor at the input end side, Since the inspection operation is started, if the voltage polarity of the pair of lines is set to a predetermined polarity, the inspection operation can be automatically started by the trigger means (terminator).

Further, according to the present invention, when the voltage polarity of the pair of lines is a predetermined polarity, the sensor operates normally and the latest sensor is inspected. When the control device disconnects the output terminal side, a pulse signal is generated on a pair of lines immediately before the disconnection, and the number of the pulse signals is counted to detect a malfunction from a plurality of sensors. Since the device is specified, it is possible to immediately know which of the plurality of sensors has a malfunction.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an abnormality monitoring system according to the present invention.

FIG. 2 is a diagram showing a configuration example of a sensor to be tested (to be inspected) in the present invention.

FIG. 3 is a diagram showing a specific example of the sensor shown in FIG. 2;

FIG. 4 is a configuration diagram of an inspection control unit.

FIG. 5 is a diagram for explaining a function of an inspection control unit.

FIG. 6 is a configuration diagram of a terminator.

FIG. 7 is a diagram for explaining the function of the terminator.

FIG. 8 is an equivalent configuration diagram of the abnormality monitoring system of FIG. 1 when an inspection operation is being performed.

FIG. 9 is an equivalent configuration diagram of the abnormality monitoring system of FIG. 1 when an inspection operation is being performed.

FIG. 10 is a diagram illustrating a specific configuration example of an inspection control unit.

FIG. 11 is a diagram illustrating a specific configuration example of a terminator.

FIG. 12 is a diagram illustrating a specific configuration example of a receiver.

FIG. 13 is a configuration diagram of a general abnormality monitoring system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiver 2 Detector 3 Terminator 4 Inspection control part 11 Conduction part 12 Isolator part 13 Test signal generation part 31 Power supply part 32 Disconnection pulse generator 33 Switch 34 Mono-multi vibrator 35 Counter 36 Sensor specification part PC, PL One pair Line G1, G2, G3 Gate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-11597 (JP, A) JP-A-64-2199 (JP, A) JP-A-50-140095 (JP, A) JP-A 52-195 42098 (JP, A) JP-A-4-335497 (JP, A) JP-A-57-5194 (JP, A) JP-A-6-30889 (JP, U) JP-A-57-38780 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 17/00 G08B 29/14

Claims (10)

(57) [Claims] 1. A sensor inspection control device used to inspect a sensor connected between a pair of lines, wherein the sensor inspection control device includes a sensor inspection control device connected to the pair of lines connected to the sensor. It is connectable and has a polarity whose characteristics change according to the voltage polarity of the pair of lines, and the impedance at the output terminal side is reduced in a state where the voltage polarity of the pair of lines is a predetermined polarity. A detector inspection control device having a function of disconnecting the output end side and generating a test signal necessary for inspecting the sensor. 2. The sensor inspection and control device according to claim 1, wherein the sensor inspection and control device includes a pair of lines when the voltage polarity of the pair of lines is opposite to the predetermined polarity. The sensor inspection control device functions as if the sensor inspection control device is not provided on the track of the vehicle. 3. The sensor inspection control device according to claim 1, wherein the sensor inspected by the sensor inspection control device includes: a pair of line connection terminals connected to a pair of lines; An input terminal for performing a function test, and when the function is normal, the impedance between the pair of line connection terminals decreases when a test signal from the sensor inspection control device is input to the input terminal. A sensor inspection control device characterized in that it is of a type. 4. A sensing and inspection system for inspecting a plurality of sensors connected between a pair of lines, wherein each of the sensors includes a pair of line connection terminals connected to the pair of lines.
An input terminal for performing a function test in a simulated manner, and when the function is normal, when a test signal is input to the input terminal, the impedance between the pair of line connection terminals is reduced, A sensor inspection and control device according to claim 1 or 2 is provided between adjacent sensors. The sensor inspection and control device has a configuration in which the voltage polarity of the pair of lines becomes a predetermined polarity and the output is controlled. When the impedance on the end side decreases, the output end side is disconnected, and a test signal is supplied to the input terminal of the nearest sensor on the input end side, and the sensor inspection control device is provided for each adjacent sensor. The sensor inspection system according to claim 1, wherein the function test of the plurality of sensors is performed sequentially from the terminal ends of the pair of lines by being provided. 5. The sensor inspection system according to claim 4, further comprising a polar trigger means whose impedance changes according to the voltage polarity of the pair of lines, at an end of the pair of lines. A sensor inspection control device according to claim 1 or 2 is further provided between the trigger means and a sensor adjacent to the trigger means, and a voltage polarity of the pair of lines becomes a predetermined polarity, When the impedance of the trigger means decreases, the sensor inspection control device nearest to the trigger means disconnects the trigger means on the output end side, and supplies a test signal to the input terminal of the nearest sensor on the input end side. Detector inspection system characterized in that the detector operation is started. 6. The sensor inspection system according to claim 4, wherein the detector operates normally when the voltage polarity of the pair of lines is a predetermined polarity. A pulse signal is generated on a pair of lines immediately before disconnection by the latest sensor inspection control device disconnecting the output end side, and the number of the pulse signals is counted, whereby the plurality of pulse signals are counted. A sensor inspection system characterized in that a malfunctioning sensor among the sensors is specified. 7. An abnormality monitoring system in which a plurality of sensors are connected between a pair of lines extending from a receiver, wherein each of the sensors includes a pair of line connection terminals connected to the pair of lines, An input terminal for performing a function test in a simulated manner, and when the function is normal, when a test signal is input to the input terminal, the impedance between the pair of line connection terminals is reduced, A sensor inspection control device according to claim 2 is provided between adjacent detectors, and the detectors are controlled when the receiver sets the voltage polarity of a pair of lines to a predetermined polarity. The inspection control device disconnects the output terminal when the impedance of the output terminal drops, provides a test signal to the input terminal of the nearest sensor on the input terminal side, and performs a functional test of the plurality of sensors on a pair of lines. Anti receiver Go forward from the end of the pair,
The receiver detects that the functions of all the sensors are normal when the sensor closest to the receiver operates within a predetermined time and the impedance between the pair of lines decreases, and When the nearest sensor does not operate within a predetermined time and the impedance between the pair of lines does not decrease, any of the plurality of sensors is detected as malfunctioning, Abnormality monitoring system. 8. The sensor inspection control device according to claim 7, wherein the receiver sets the voltage polarity of the pair of lines to a polarity opposite to the predetermined polarity in the receiver. This functions as if it is not provided on the pair of lines, and when any of the plurality of sensors detects an abnormality, the impedance between the pair of lines decreases, and based on this, the receiver Is an abnormality monitoring system characterized by detecting occurrence of an abnormality. 9. The abnormality monitoring system according to claim 7, wherein an impedance at an end of the pair of lines opposite to the receiver is changed according to a voltage polarity of the pair of lines. A polarity terminator is further connected,
Further, a sensor inspection control device according to claim 2 is provided between the terminator and a sensor adjacent to the terminator, and the receiver sets the voltage polarity of the pair of lines to a predetermined polarity. When set to, the impedance of the terminator decreases,
The sensor inspection control device nearest to the terminator disconnects the terminator on the output end side, applies a test signal to the input terminal of the nearest sensor on the input end side, and starts the inspection operation. An abnormality monitoring system characterized in that: 10. The abnormality monitoring system according to claim 7, wherein the detector operates normally in a state where the voltage polarity of the pair of lines is a predetermined polarity. In this way, the sensor inspection control device immediately adjacent to the sensor disconnects the output end side, so that a pulse signal is generated on a pair of lines immediately before disconnection. If the nearest sensor to the receiver does not operate within a time, the number of the pulse signals is counted to identify a malfunctioning sensor from the plurality of sensors. Monitoring system.