WO2015064918A1 - 양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템 - Google Patents
양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템 Download PDFInfo
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- WO2015064918A1 WO2015064918A1 PCT/KR2014/009104 KR2014009104W WO2015064918A1 WO 2015064918 A1 WO2015064918 A1 WO 2015064918A1 KR 2014009104 W KR2014009104 W KR 2014009104W WO 2015064918 A1 WO2015064918 A1 WO 2015064918A1
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- Prior art keywords
- line
- terminal
- loop
- coupled
- isolator
- Prior art date
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- 230000006854 communication Effects 0.000 title claims abstract description 53
- 238000004891 communication Methods 0.000 title claims abstract description 53
- 238000011084 recovery Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 230000007613 environmental effect Effects 0.000 claims description 8
- 230000007175 bidirectional communication Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000005856 abnormality Effects 0.000 description 11
- 239000000779 smoke Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000005669 field effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5458—Monitor sensor; Alarm systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5495—Systems for power line communications having measurements and testing channel
Definitions
- the present invention relates to a communication recovery method using an isolator in communication over a power line, in particular in a facility for detecting and alarming a fire or gas in a large space, such as inside / outside the vessel, plant or building, etc.
- the present invention relates to a communication recovery method using an isolator in communication through power lines of onshore and offshore facilities capable of quickly detecting a situation in which a part of a communication line is disconnected or shorted and recovering the communication line.
- Smoke detector that detects smoke generation by detecting and alarming fire or gas in a large space such as inside / outside of ship, plant or building, inside / outside of building, temperature detector to detect ambient temperature, and flame generation
- a number of flame detectors and the like are provided for detection, and a system for detecting the occurrence of a fire according to the operation of each detector is used.
- FIG. 1 is a view schematically showing the overall configuration of a fire occurrence detection system for the implementation of the method according to an embodiment of the present invention.
- a fire detection alarm system applied to the present invention includes a main control panel 10, a first power supply A, a second power supply B, and an emergency DC power supply for controlling the entire system.
- Alarms for various detectors and alarms such as smoke detectors, heat detectors, composite detectors, camera module units, VO units, conventional detectors, addressable units, manual call points, flame detectors and IS barrier units
- An eight-channel standard relay for switching 20 a peripheral device including an eight-channel programmable relay, and the main control panel 10, the power supplies A, B, and C, the sensing device. 20, the sub l And an interface unit 30 for interfacing with the null 40, the peripheral device 50, and the like.
- FIG. 2 is a block diagram illustrating in detail the configuration of the interface unit in FIG. 1.
- the communication loop 70 may include at least two parallel lines connected at both ends of the interface unit 30. 11 and 12, and each device is connected to each of these lines by connecting the (+) and (-) terminals of the devices including the detector 20 to each other.
- the sensing device 20 that can be connected to the communication loop 70 are smoke detectors for detecting the generation of smoke, temperature detectors for detecting the ambient temperature, flame detectors for detecting the occurrence of flame, in case of emergency, There are emergency manual push switches that can be operated manually, timers that count set times, alarms, and I / O units.
- the communication loop 70 may be extended to a plurality in the interface unit 30 when, for example, provided with a plurality of loop cards, the sensing loops are connected to the communication loop 70 within a range identifiable by itself, For example, about 127 devices may be connected when the 7-bit signal in the communication loop 70 can distinguish various devices such as a detector.
- the interface unit 30 includes a loop 1-A terminal 31, a loop 1-B terminal 32, a communication interface 35, a power supply terminal 36, and an MCU 38, and includes a main control panel 10. Communication with the tracks 11 and 12 constituting the communication loop 70 and for controlling the sensing device 20 from the main control panel 10 with respect to the communication loop 70. Receive and output the signal. In addition, the interface unit 30 receives a current from each sensing device 20 and transmits it to the main control panel 10.
- 3 (a) and 3 (b) are diagrams for explaining a method of using the zone detecting method of the prior art in FIG. 2.
- power line communication is used to send a signal to the (+) line and to receive a signal from the detector to the (-) line.
- three to four zones of detectors 20 are provided for each zone of the isolator 200-1 in the isolator 200-1 of the loop 1 -A terminal 31.
- Each isolator is installed.
- isolators are provided for every three to four sensors, but in practice this number may be as high as eight to twelve.
- the isolator 200-2 and the isolator 200-2 block the line in the zone including the short section. There was a problem in the zone that prevented the detector from operating.
- the present invention was developed in recognition of the problems of the prior art as described above, communication in a facility for the detection and alarm of fire or gas in a large space, such as inside / outside the vessel, plant or building
- An object of the present invention is to provide a communication recovery method using an isolator in communication through power lines of land and marine facilities, which can quickly detect a part of a line disconnected or short-circuited and recover a communication line.
- An environmental sensing system having a communication recovery function including an isolator coupled to a bidirectional communication loop according to the present invention for achieving the above object includes a first line and a second line extending in parallel in a predetermined space.
- a digital call signal for calling a device of the device is output through the first line using at least one of the loop A terminal and the loop B terminal, and a change in current appearing in the second line is output from the loop A terminal and the loop B.
- An interface unit which receives the signal using at least one of the terminals and converts the received signal into a received signal; It is connected to the first line and the second line and is driven by the operating voltage of the first line to sense an environmental state to generate a predetermined measurement value, and to respond to the digital call signal, its own address data and the A plurality of detectors for transmitting measured values by varying the current in the second line; Connected to the first line and the second line so as to cut the second line and connect both ends generated by the cutting to each other (i.e., in a normal connection state that maintains continuity of the second line) or off.
- an isolating state for maintaining the second line in a cut state (I.e., an isolating state for maintaining the second line in a cut state), and normally, the second line is maintained in a normal connection state, and the first line and the second line of the communication loop
- An isolator which switches off the both ends of the second line to the isolating state when an abnormal state in which a part is shorted to each other is detected;
- the operation voltage and the digital call signal are output to one side of the first line through the loop A terminal, and the current change that occurs in the second line is changed to the loop A terminal and the loop B. Simultaneously receiving at the terminal, and if the current change is not received at the second line of any one of the loop A terminal and the loop B terminal, the operation to the other side of the first line through the loop B terminal A voltage and the digital call signal are output.
- the isolator receives the current of the second line by isolating state data indicating whether to switch to its address data and isolating state in response to the digital call signal of the first line calling the self. And transmits to the main control panel by changing, wherein the main control panel determines occurrence of an abnormal state in the communication loop at an arrangement position of the isolator when the isolating state data is extracted from the received signal. .
- the isolator may include a + VDD terminal to which the first line is branched and coupled, a -IN terminal to which one end generated by cutting the second line is coupled, and an -OUT to which the other end generated by cutting is coupled.
- a + VDD terminal to which the first line is branched and coupled
- a -IN terminal to which one end generated by cutting the second line is coupled
- an -OUT to which the other end generated by cutting is coupled.
- the driving circuit unit of the isolator may include a first diode having an anode coupled to the -OUT terminal, an anode coupled to the -IN terminal, and a second diode coupled with the first diode and the cathode; And a first resistor and a third resistor having one ends coupled to the cathode of the second diode, the other end of the first resistor coupled to the base, and the emitter having a first PNP transistor coupled to a + VDD terminal, and the -IN terminal.
- a drain is coupled to the source, the source is a first N-channel FET coupled to the other end of the third resistor, a drain is coupled to the -OUT terminal, and the source is a second N-channel FET coupled to the other end of the third resistor. And a second resistor having one end coupled to the collector of the first PNP transistor and the other end coupled to the gate of the first N-channel FET and the gate of the second N-channel FET. .
- the isolator in an onshore and offshore facility, is used to shut off the line after the abnormal part even in the case of a short circuit, ground, disconnection, etc., and operates only the lines before the abnormal part individually. It not only enables signal transmission and reception within its own loop but also sends its address to the loop from an isolator that detects an abnormality, and as a result, makes it possible to clearly know the point of the disconnection despite the disconnection of the line. You can get the effect to cope with.
- FIG. 1 is a view schematically showing the overall configuration of a fire occurrence detection system for the implementation of the method according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating in detail the configuration of the interface unit in FIG. 1.
- 3 (a) and 3 (b) are diagrams for describing a method of using a zone type isolator of the prior art in FIG. 2.
- 4 (a) and 4 (b) are views illustrating a normal state, a short circuit, and an overcurrent state in a line configuration of a communication loop including an isolator according to an embodiment of the present invention.
- 5 (a) and 5 (b) are diagrams for explaining the operation concept of the isolator.
- FIGS. 3 (a) and 6 (b) are block diagrams showing detailed configurations of the isolators of FIGS. 3 (a) and 3 (b) according to one embodiment of the present invention.
- FIG. 7 (a) is a diagram for explaining the operation in the case of a line abnormality such as a short circuit, ground or circuit break in the isolator shown in FIG. 6 (a).
- FIG. 7B is a diagram for explaining the FIG. 7A.
- FIG. 8 (a) is a view for explaining the operation in the case of a line abnormality such as short circuit, ground or circuit break in the isolator shown in FIG. 6 (b), and FIG. 8 (b) is the above FIG. A diagram for explaining.
- FIG. 10 illustrate a method according to another embodiment of the present invention.
- Figure 11 shows an isolator circuit diagram according to one embodiment of the present invention.
- 12 (a) and 12 (b) show a case in which + VDD and -VDD are normally powered on in the isolator circuit of the present invention shown in FIG. 10 and when + VDD and the output terminal (-OUT) are disconnected or shorted.
- 10 is a view for explaining the operation of FIG.
- 4 (a) and 4 (b) are views illustrating a normal state, a short circuit, and an overcurrent state in a line configuration of a communication loop including an isolator according to an embodiment of the present invention.
- the isolator 20a receives the isolating confirmation signal from the interface unit 30 through the main control panel 10 to locate the address and line 11 'and 12' where it is located. ) Is transmitted to the interface unit 30.
- the isolator 20a may be included in the sensing device 20 or may be provided in the above-described loop base unit.
- the isolator 20a may include a communication circuit for transmitting / receiving a signal and a CPU for controlling the same. Then, the address and status signal transmitted to the interface unit 30 are transmitted to the main control panel 10 to check the address and status of the isolator 20a to confirm which line is currently in a state among a number of lines. Can be.
- 5 (a) and 5 (b) are diagrams for explaining the operation concept of the isolator.
- the isolator circuit disconnects at least one of the + VDD line and the -VDD line (especially the -VDD line) in the abnormal state where a short circuit between the + VDD line and the -VDD line of the power line communication is detected in the normal state. To prevent the + VDD voltage of the circuit from shorting to the -VDD voltage of the -VDD line.
- This isolator circuit has a + VDD terminal branched from the + VDD line.
- the isolator circuit also includes a -IN terminal to which the -VDD line is cut and one end of the cut line is connected, and an -OUT terminal to which one end of the cut line is connected.
- the isolator circuit can be driven using the + VDD voltage, and in normal conditions, the -IN terminal and -OUT terminal are electrically connected to each other to ensure continuity of the -VDD line, and in an abnormal state, the -OUT terminal.
- To isolate the -VDD line by isolating the + VDD and -IN terminals.
- Fig. 4A the -IN terminal and the -OUT terminal are connected to each other, and the continuity of the + VDD line and the -VDD line is independently maintained. Therefore, any device connected to the rear end of the isolator circuit can use the + VDD voltage and the -voltage to maintain operation and power line communication.
- a line short circuit occurs at the rear end of the isolator circuit, whereby the -IN terminal and the -OUT terminal are isolated.
- the same effect as that of the line disconnected based on the isolator circuit is obtained.
- FIGS. 5 (a) and 5 (b) are block diagrams showing detailed configurations of the isolators of FIGS. 5 (a) and 5 (b) according to one embodiment of the present invention.
- the detector 20 includes a detector circuit 20b and an isolator 20a for detecting smoke, heat, and flames.
- the interface unit 30 transmits a voltage signal for checking the state of the lines 11 'and 12'
- the isolator 20a of the sensing device 20 receives the smoke received from the detector circuit 20b
- a signal having information on a sensing state such as heat and flame, and a signal having information on an address of the sensing device 20 in which the sensor is located are transmitted to the interface circuit 30 as a current signal.
- the main control circuit 10 compares the signal value of the current signal transmitted from the interface unit 30 with the contents of the current value stored in its database and analyzes what information the current signal contains.
- an isolator having an address transmission function is included in the loop base unit 200.
- the interface unit 30 transmits a voltage signal for checking the states of the lines 11 'and 12', the deferral received from the detector circuit 20b in the isolator 20a of the loop base unit 200. And a signal having information on a sensing state such as heat and flame, and a signal having information on the address of the sensing device 20 in which the sensor is located, are transmitted to the interface circuit 30 as a current signal. Then, the main control circuit 10 compares the signal value of the current signal transmitted from the interface unit 30 with the contents of the current value stored in its database and analyzes what information the current signal contains.
- Fig. 7A is a view for explaining the operation in the case of a line abnormality such as a short circuit in the isolator shown in Fig. 6A
- Fig. 7B is an equivalent circuit of the circuit of Fig. 7A. Shows.
- the sensing device 20 including an isolator 20a immediately preceding the shorted portion indicated by the circle. Is operated to isolate the track, so that only the loop at the previous stage, that is, the front stage of the short circuit, is operated and the tracks 11 'and 12' at the subsequent stage are not operated.
- the isolating operation of the isolator 20a applies a power cut method, but is not limited thereto, and other methods may be applied.
- the line operates without any problem.
- the bidirectional communication is performed, as shown in FIG. In the closed circuit is formed, a current signal is input to the negative terminal, and the current signal includes isolating state data and address data of the isolator 20a.
- FIG. 8 (a) is a view for explaining the operation in the case of a line abnormality such as a short circuit in the isolator shown in FIG. 6 (b), and FIG. 8 (b) shows an abnormality in the line in FIG. 8 (a). The case is shown.
- the isolator 200a immediately preceding the shorted portion indicated by the circle is operated to isolate the line.
- the isolator 200a having an isolating function and an address transmitting function is built in the loop base unit 200 and may be a central processing unit (CPU) or the like.
- the base unit 200 is provided with a communication circuit for transmitting an isolated state to the sensing device 20. According to the above, in spite of the short circuit of the tracks 11 and 12, the track operates without abnormality.
- the voltage signal is also output from the (+) terminal in the loop 1-B terminal 32, and the terminal before the short circuit portion shown in circles.
- a current signal is input to the negative terminal, and the current signal includes isolating state data and address data of the isolator 200a.
- FIG. 10 illustrate a method according to another embodiment of the present invention.
- Figure 11 shows an isolator circuit diagram according to one embodiment of the present invention.
- the isolator circuit includes a transistor 1 (TR1) receiving a VDD power, a load resistor 2 (R2) connected in series with the transistor 1 (TR1), a resistor 1 (R1) connected in parallel with the resistor, and the Another resistor R3 connected in series with resistor 1 (R1), a field effect transistor (FET) 1 (F1) connected in series with a power supply input terminal, that is, -VDD (-IN), and connected in parallel with the resistor 2 (R2); A field effect transistor (FET) 2 (F2) connected in series with the output terminal (-OUT), a diode 1 (D1) connected in series with the output terminal (-OUT) and a forward series connection with the -power input terminal (-VDD) Diode 2 (D2).
- FIG. 12A that is, a normal state in which a normal power is applied to the + VDD and -IN terminals is illustrated.
- + VDD voltage is applied to the + VDD terminal and-VDD is applied to the-IN terminal and-OUT terminal, for example, (1) through the switching element F1 (for example, the N-channel FET).
- VDD is applied so that the source side line of the switching element F1 becomes -VDD.
- the voltage applied to the emitter side of the switching element TR1 (for example, PNP transistor) causes a weak current to flow through the resistor R1 and the resistor R2 through the circuit.
- a weak current flows through the circuit of the switching element TR1, a voltage is applied to the resistor R3.
- a voltage is also applied to the gates of the switching element F1 and the switching element F2 (for example, the N-channel FET), and the switching element F1 and the switching element F2 are turned on.
- -VDD applied to the switching element F1 flows to the -OUT terminal through the switching element F2 which is turned on.
- the isolator that detects an abnormality transmits its own address to the loop, resulting in a clear indication of the point of short circuit despite the short circuit. You can get the effect to cope with.
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Abstract
Description
Claims (5)
- 소정의 공간 내에 서로 평행하게 연장된 제1선로 및 제2선로를 포함하는 통신루프;상기 제1선로 및 상기 제2선로 각각의 일측 단부와 연결되는 루프A 단자와, 상기 제1선로 및 상기 제2선로 각각의 타측 단부와 연결되는 루프B 단자를 포함하고, 소정의 동작 전압 및 특정의 장치를 호출하는 디지털 호출 신호를 상기 루프A 단자 및 상기 루프B 단자 중 적어도 하나를 이용하여 상기 제1선로를 통해 출력하고, 상기 제2선로에서 나타나는 전류 변화를 상기 루프A 단자 및 상기 루프B 단자 중 적어도 하나를 이용하여 수신한 후 수신신호로 변환하는 인터페이스 유닛;상기 제1선로 및 상기 제2선로에 연결되어 상기 제1선로의 상기 동작전압에 의해 구동하여 환경상태를 감지하여 소정의 측정값을 생성하고, 상기 디지털 호출 신호에 응답하여 자신의 주소 데이터 및 상기 측정값을 상기 제2선로의 전류를 변화시킴으로써 전송하는 복수의 감지기;상기 제1선로 및 상기 제2선로에 연결되어, 상기 제2선로를 절단하고 절단으로 생성된 양단을 서로 연결시키거나(즉, 상기 제2선로의 연속성을 유지하는 정상연결 상태) 또는 오프시키도록(즉, 상기 제2선로를 절단된 상태로 유지하는 아이솔레이팅 상태) 구성되며, 평상시에는 상기 제2선로를 정상연결 상태로 유지하고, 상기 통신루프의 상기 제1선로 및 상기 제2선로의 일부가 서로 단락되는 이상상태가 감지되는 경우에는 상기 제2선로의 절단된 양단을 오프시켜 아이솔레이팅 상태로 전환하는 아이솔레이터; 및상기 인터페이스 유닛에 복수의 상기 감지기 중 적어도 하나를 호출하기 위한 상기 디지털 호출 신호를 제공하고, 상기 인터페이스 유닛의 상기 수신신호로부터 추출된 상기 측정값에 기초하여 상기 감지기 주변의 환경상태를 판단하는 메인 컨트롤 패널을 포함하는 양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템.
- 제1항에 있어서,상기 인터페이스 유닛에 있어서,상기 동작전압 및 상기 디지털 호출 신호는 상기 루프A 단자를 통해 상기 제1선로의 일측에 출력되고,상기 제2선로에서 나타나는 전류 변화를 상기 루프A 단자와 상기 루프B 단자에서 동시에 수신하고,만일, 상기 루프A 단자 및 상기 루프B 단자 중 어느 하나의 상기 제2선로에서 상기 전류 변화가 수신되지 않는 경우, 상기 루프B 단자를 통해 상기 제1선로의 타측으로 상기 동작전압 및 상기 디지털 호출 신호를 출력하는 것을 특징으로 하는 양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템.
- 제1항에 있어서,상기 아이솔레이터는 자신을 호출하는 상기 제1선로의 상기 디지털 호출 신호에 응답하여 자신의 주소 데이터 및 아이솔레이팅 상태로의 전환여부를 표시하는 아이솔레이팅 상태 데이터를 상기 제2선로의 전류를 변화시킴으로써 상기 메인 컨트롤 패널에 전송하고,상기 메인 컨트롤 패널은, 상기 수신신호로부터 상기 아이솔레이팅 상태 데이터가 추출되면 상기 아이솔레이터의 배치 위치의 상기 통신루프에서 이상상태의 발생을 판단하는 것을 특징으로 하는 양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템.
- 제1항에 있어서,상기 아이솔레이터는,상기 제1선로가 분기되어 결합되는 +VDD단자와, 상기 제2선로를 절단하고 절단으로 생성된 일단이 결합되는 -IN단자와, 절단으로 생성된 타단이 결합되는 -OUT단자와, 상기 +VDD단자로 상기 동작전압이 인가되면 상기 -IN단자와 상기 -OUT단자를 서로 연결(short)시키고 만일 상기 +VDD단자로 상기 동작전압이 감지되면서 동시에 상기 -OUT단자에서도 상기 동작전압이 감지되면 상기 -OUT단자를 상기 -IN 단자와 오프시키는 구동회로부를 포함하는 것을 특징으로 하는 양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템.
- 제4항에 있어서,상기 아이솔레이터의 상기 구동회로부는,상기 -OUT단자에 애노드가 결합된 제1다이오드와,상기 -IN단자에 애노드가 결합되고 상기 제1다이오드와 캐소드끼리 결합된 제2다이오드와,상기 제1 및 제2다이오드의 캐소드에 일단들이 각각 결합된 제1저항 및 제3저항과,베이스에 제1저항의 타단이 결합되고, 에미터는 +VDD단자에 결합된 제1 PNP 트랜지스터와,상기 -IN단자에 드레인이 결합되고, 소스는 상기 제3저항의 타단에 결합된 제1 N채널 FET와,상기 -OUT단자에 드레인이 결합되고, 소스는 상기 제3저항의 타단에 결합된 제2 N채널 FET와, 및일단은 상기 제1 PNP 트랜지스터의 콜렉터에 결합되고, 타단은 상기 제1 N채널 FET의 게이트와 상기 제2 N채널 FET의 게이트에 공통으로 결합된 제2저항을 구비하는 것을 특징으로 하는 양방향 통신루프에 결합된 아이솔레이터를 포함하는 통신 복구 기능을 구비한 환경감지 시스템.
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