JP2012194645A - Receiver and monitoring control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine whether a terminator connected to a line is a first type terminator (terminator including a capacitor) or a second type terminator (terminator consisting only of a resistor). Provided is a receiver capable of detecting disconnection.
A first transmitter 41 for transmitting a first-type terminator detection signal for detecting whether or not a first-type terminator is connected as the terminator 3 of the line Kn to the line Kn. A second transmission unit 42 that transmits a second-type termination device detection signal for detecting the presence or absence of connection of the second-type termination device to the line Kn, and a first-type termination device detection signal. Based on the response from the line K-n when transmitted to the line K-n, the first detection unit 43 that detects the presence or absence of connection of the first type terminator, and the second type terminator detection signal And a second detector 44 that detects the presence or absence of connection of the second type terminator based on a response from the line K-n when transmitted to the line K-n.
[Selection] Figure 4

Description

  The present invention relates to a receiver and a supervisory control system.

  FIG. 1 is a diagram showing a configuration example of a conventional general automatic fire alarm facility (monitoring control system). Referring to FIG. 1, this automatic fire alarm system (monitoring control system) is configured as a P-type system, and includes a P-type receiver (for example, P-type fire receiver) 1 and a P-type receiver (for example, P-type). And a line (LC line, sensor line) K-1 to Kn connected to the fire receiver 1. Here, the lines (L-C line, sensor line) K-1 to K-n are lines (district lines) that serve as power supply / signal lines corresponding to the warning area (district). A so-called on / off-type fire detector 2 is connected to -1 to Kn (that is, to the L-C lines of the lines K-1 to Kn). Also, at the end of each line K-1 to Kn (that is, to the end of the LC line of each line K-1 to Kn), the line K-1 to Kn is disconnected. A terminator 3 is connected for detection.

  In such an automatic fire alarm system (monitoring control system), the P-type receiver 1 normally supplies a voltage (power supply voltage) of 24 V to each line (LC line) K-1 to Kn. (Normally, the line voltage is 24V), and when the fire detector 2 connected to a certain line (LC line) detects a fire, the alarm is activated and the line voltage of the line is lowered to about 5V. (Remaining voltage at the time of alarm). The P-type receiver 1 monitors the change in the line voltage. When the drop in the line voltage is detected, so-called accumulation processing is performed, and when a fire is confirmed, the alarm display unit, the acoustic alarm unit, etc. are activated. Fire alarm.

  In addition, the P-type receiver 1 connects the terminator 3 to the end of each of the lines K-1 to Kn (that is, to the end of the LC line of each of the lines K-1 to Kn), The disconnection of each line K-1 to Kn is detected.

  Here, conventionally, as shown in Patent Document 1, a circuit that includes a capacitor as shown in FIG. 2A as a terminator 3 at the end of the line (consisting of a capacitor (and a resistor)). And disconnection monitoring by connecting a terminal consisting of only a resistor as shown in FIG. 2 (b) as a terminator 3 at the end of the line as shown in Patent Document 2 There is a method to perform. A terminator including a capacitor is hereinafter referred to as a first type terminator, and a terminator including only a resistor is hereinafter referred to as a second type terminator.

  That is, conventionally, the disconnection monitoring / detection method and the disconnection detection circuit of the P-type receiver 1 are different depending on whether the terminator 3 is the first type terminator or the second type terminator. A P-type fire receiver capable of detecting disconnection by connecting a first-type terminator to the terminator 3, and a P-type fire receiver capable of detecting disconnection by connecting a second-type terminator to the terminator 3; Only existed.

Japanese Utility Model Publication No. 57-38777 JP-A-63-136195

  The above-mentioned automatic fire alarm system (monitoring control system) installs a fire detector at the time of construction and lays a fire detector line. Unless it is installed, it will operate for 20 years while maintaining its installation. However, when replacing a fire receiver during renewal construction (when the terminator specifications are different for the target property), etc., the specifications of the field terminator (the terminator is the first type or the second type) It is necessary to prepare a fire receiver according to the Or, it is necessary to replace the field connection terminator according to the specifications of the fire receiver to be replaced. In this case, it is necessary to find out what kind of terminator is connected to the line depending on the field. The work was extremely inefficient and uneconomical.

  The present invention provides a receiver capable of monitoring and detecting disconnection of a line regardless of whether the terminator connected to the line is the first type of terminator or the second type of terminator. And to provide a supervisory control system.

  In addition, the present invention provides a receiver and a supervisory control system capable of identifying whether a terminator connected to a line is a first type terminator or a second type terminator. It is an object.

  In order to achieve the above object, a first aspect of the present invention is a receiver having a function of monitoring and controlling a connected line, wherein a first type of terminator is connected as the terminator of the line. Whether or not a first type terminator detection signal for detecting whether or not a second type terminator is connected to the line, and whether or not a second type terminator is connected as the line terminator. Second transmission means for transmitting a second type terminator detection signal for detection to the line, and the line when the first type terminator detection signal is transmitted to the line by the first transmission means. Based on the response from the first detection means for detecting whether or not the first type of terminator is connected as the line terminator, and the second type of terminator detection signal is sent by the second transmission means. Based on the response from the line when sent to the line, the It is characterized in that the second type of terminator is a second detection means for detecting whether or not it is connected as a terminator of the line.

  According to a second aspect of the present invention, in the receiver according to the first aspect, is the line disconnected based on a detection result of the first detection means and a detection result of the second detection means. It is characterized by further comprising a disconnection determining means for determining whether or not.

  According to a third aspect of the present invention, in the receiver according to the second aspect, the disconnection determination means detects that the detection result of the first detection means is not connected to the first type terminator. And when the detection result of the second detection means is a detection result that the second type terminator is not connected, it is determined that the line is disconnected, and the first The detection result of the first detection means is the detection result that the first type terminator is connected, or the detection result of the second detection means is the second type of terminator connected. It is characterized in that it is determined that the line is not disconnected when the detection result indicates that the line is disconnected.

  According to a fourth aspect of the present invention, in the receiver according to the first aspect, when the detection result of the first detection means is a detection result that the first type terminator is connected, When it is identified that the first type of terminator is connected as the terminator of the line, and the detection result of the second detection means is the detection result that the second type of terminator is connected Further, it is characterized in that it is identified that a second type of terminator is connected as the terminator of the line.

  According to a fifth aspect of the present invention, in the receiver according to any one of the first to fourth aspects, the first type terminator detection signal transmitted to the line by the first transmission means. And the second type terminator detection signal transmitted to the line by the second transmitting means are alternately transmitted to the line at different timings.

  According to a sixth aspect of the present invention, in the receiver according to any one of the first to fifth aspects, the first type of terminator includes a capacitor, and the second type of terminator is provided. The vessel is characterized by consisting only of resistors.

  According to a seventh aspect of the present invention, in the receiver according to the sixth aspect, a line impedance control resistor is provided between the first transmission unit and the second transmission unit and the line. And when the second transmission means transmits the second type terminator detection signal to the line, the first transmission means transmits the first type terminator detection signal to the line. The line impedance control resistor is made larger than the above.

  The invention according to claim 8 is a monitoring control system comprising the receiver according to any one of claims 1 to 7.

  According to the first to eighth aspects of the present invention, a receiver having a function of monitoring and controlling a connected line, is the first type terminator connected as a terminator for the line? A first transmission means for transmitting a first type terminator detection signal for detecting whether or not to the line, and whether or not a second type of terminator is connected as the line terminator. A second transmission means for transmitting a second type terminator detection signal to the line for transmission from the line when the first type termination device detection signal is transmitted to the line by the first transmission means. Based on the response, the first detection means for detecting whether or not the first type of terminator is connected as the terminator of the line, and the second type of terminator detection signal is sent by the second transmission means to the line. The end of the line based on the response from the line when And a second detection means for detecting whether or not the second type of terminator is connected as a device, so that the terminator connected to the line is the first type of terminator and the second type of terminator. Regardless of whether it is a terminator, it is possible to monitor and detect disconnection of the line, and the terminator connected to the line is either the first type terminator or the second type terminator. Can also be identified.

It is a figure which shows the structural example of the conventional general automatic fire alarm equipment (monitoring control system). It is a figure which shows the example of a termination | terminus device. It is a figure which shows the structural example of the monitoring control system of this invention. It is a figure which shows the structural example of the district circuit of the receiver of the monitoring control system of FIG. It is a figure which shows the outline of the timing control performed by CPU. It is a figure which shows the specific example of a district circuit. It is a time chart for demonstrating the normal operation | movement of the district circuit of FIG. FIG. 7 is a time chart for explaining a first type terminator detection operation in the district circuit of FIG. 6. FIG. FIG. 7 is a time chart for explaining a type 2 terminator detection operation in the district circuit of FIG. 6. FIG. It is a flowchart for demonstrating the process in CPU.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 3 is a diagram showing a configuration example of the monitoring control system of the present invention. FIG. 4 is a diagram showing a configuration example of a district circuit of the receiver of the monitoring control system of FIG. 3 and 4, the monitoring control system is configured as a P-type system, and the receiver is configured as a P-type receiver (for example, a P-type fire receiver). In FIGS. 3 and 4, The same parts as those in FIG.

  Referring to FIG. 3, the supervisory control system includes a receiver 11 and district lines K- 1 to K-n connected to the receiver 11.

  Here, the receiver 11 includes a district circuit 12, to which the district lines K-1 to Kn are connected, a smoke prevention circuit 13, a district acoustic circuit 14, a transfer circuit 15, and a CPU 21 that controls the whole. ROM 22, RAM 23, EEPROM 24, operation unit 27, display unit 28, alarm sound unit 29, district circuit 12, smoke prevention circuit 13, district sound circuit 14, and transfer circuit 15. The I / O units 31, 32, 33, and 34 serving as / O interfaces have a function of monitoring and controlling the connected district lines K-1 to K-n.

  Referring to FIG. 4, the district circuit 12 includes n district circuit units 12-1 to 12-n corresponding to the district lines K-1 to Kn, respectively. 12-1 to 12-n, for example, 12-n are the first type of terminator (terminator including a capacitor) as shown in FIG. 2A as the terminator 3 of the corresponding district line K-n. For example, a first transmission unit 41 that transmits a first type terminator detection signal for detecting whether or not is connected to the district line Kn and a terminator 3 of the corresponding district line Kn The type 2 terminator detection signal for detecting whether or not the type 2 terminator (terminator consisting only of resistors) as shown in FIG. The second transmitter 42 for transmitting to the first line and the first type terminator detection signal are transmitted by the first transmitter 41 to the district line A first detector for detecting whether or not the first type terminator is connected as the terminator 3 of the district line K-n based on the response from the district line K-n when transmitted to -n 43, and the termination type 3 of the district line K-n based on the response from the district line Kn when the second type termination unit detection signal is transmitted to the district line Kn by the second transmitter 42. Monitoring whether or not the second detector 44 detecting whether or not the second type terminator is connected and the fire detector 2 connected to the corresponding district line K-n is activated. And a fire detection unit 45 for detecting a fire.

  In FIG. 4, a line impedance control resistor (sensor limiting resistor) R1-n is provided between the first transmitter 41 and the district line Kn, and the second transmitter 42 and the district line are connected. Between the line K-n, a line impedance control resistor (sensor limiting resistor) R2-n is provided. Here, the resistance for line impedance control (sensor limiting resistance) R1-n is, for example, 660Ω, and the resistance for line impedance control (sensor limiting resistance) R2-n is, for example, 3.6 KΩ, and the resistance for line impedance control (Sensor limit resistance) R2-n has a resistance value larger than the line impedance control resistance (sensor limit resistance) R1-n. Thus, when the second transmitter 42 transmits the second type termination device detection signal to the district line K-n, the first transmission unit 41 sends the first type termination device detection signal to the district line K-. The resistance for line impedance control is made larger than when transmitting to n. As will be described later, this is when the second detector 44 detects whether or not the second type of terminator (terminator consisting only of resistors) is connected as the terminator 3 of the district line K-n. In order to provide a detection width (voltage width) for detecting whether or not the second type terminator (terminator consisting only of a resistor) is connected, that is, to provide a detection margin, the line impedance control resistance is not increased. This is because sometimes there is a risk of false detection.

  In addition, a first type termination device detection signal transmitted to the district line K-n by the first transmission unit 41 and a second type termination device detection transmitted to the district line K-n by the second transmission unit 42. The service signal is transmitted alternately at different timings.

  Such timing control is actually performed by the CPU 21. FIG. 5 is a diagram showing an outline of timing control performed by the CPU 21. Referring to FIG. 5, during normal time (period indicated by T0 in FIG. 5), the CPU 21 monitors whether or not the fire detector 2 connected to the corresponding district line K-n is activated and fires. A fire is detected by the detection unit 45. Then, for example, every 40 seconds, the CPU 21 transmits a first-type terminator detection signal to the district line K-n by the first transmission unit 41 and the first detection unit 43 transmits the signal of the district line K-n. A first-type terminator detection operation for detecting whether or not a first-type terminator is connected as the terminator 3 is performed during a period indicated by T1 in FIG. A second type of terminator detection signal is transmitted to -n, and the second detection unit 44 detects whether or not the second type of terminator is connected as the terminator 3 of the district line K-n. The seed terminator detection operation is performed during a period indicated by T2 in FIG.

  FIG. 6 shows a specific example of the district circuit 12. Here, since each of the district circuit units 12-1 to 12-n of the district circuit 12 has the same configuration, the district circuit unit 12-n of the district circuit 12 will be described in detail below. Referring to FIG. 6, in the district circuit 12, the power supply voltage is set to 24V, and the first transistor Q1 that is turned on when the first input signal P1 from the CPU 21 is at a high level (H), and the CPU 21 The second transistor Q2 which is turned on when the second input signal P2 from is high level (H), and the line impedance control resistor (sensor limiting resistor) R1- connected to the first transistor Q1 n (for example, 660Ω), a line impedance control resistor (sensor limiting resistor) R2-n (for example, 3.6KΩ) connected to the second transistor Q2, and a terminator 3 for the district line K-n. When detecting whether or not one type of terminator (terminator including a capacitor) is connected, the first type of terminator (terminator including a capacitor) is used as the terminator 3 of the district line K-n. ) Is connected, a resistor R3-n (for example, 100 KΩ) that functions as a discharging resistor for the capacitor, a comparator CA-n that functions as the fire detection unit 45 or the first detection unit 43, and a second The comparator CB-n functioning as the detection unit 44, the Zener diode ZD1 for setting the Zener voltage (for example, 10.11 to 10.55V) as the reference voltage Vr1 of the comparator CA-n, and the resistance voltage dividing circuit of the comparator CB-n. The resistor R4 (for example, 21.5 KΩ) and the resistor R5 (for example, 62 KΩ) for setting the reference voltage Vr2 are provided.

  Note that the resistance value is the resistance value of the sensor 2 connected to the district line Kn, and the first type terminator (terminator including a capacitor) is connected as the terminator 3 of the district line Kn. For example, the capacitance value of the capacitor when the second type terminator (terminator consisting only of a resistor) is connected as the terminator 3 of the district line K-n. Specifically, the equivalent resistance per sensor is 800 KΩ, and when a maximum of 32 sensors are connected to the district line Kn, the resistance value (sensing by the sensor of the district line Kn is detected. Device load) is 25 KΩ (800 KΩ / 32) to ∞. Further, when a first type of terminator (terminator including a capacitor) as shown in FIG. 2A is connected as the terminator 3 of the district line K-n, the first type of terminator is It was assumed that a 10Ω resistor and a 4.7 μF capacitor were connected in series. Further, when a second type of terminator (terminator consisting of only a resistor) as shown in FIG. 2B is connected as the terminator 3 of the district line K-n, this second type of terminator is connected. Is connected to a 10 KΩ resistor.

  Here, the reason why the resistance for line impedance control (sensor limit resistance) R1-n connected to the first transistor Q1 is as low as 660Ω, for example, is because current is required for supplying power to the sensor. It is. On the other hand, the line impedance control resistor (sensor limit resistor) R2-n connected to the second transistor Q2 has a high resistance of 3.6 KΩ, for example, as described above. When the section 44 detects whether or not the second type terminator (terminator consisting only of resistance) is connected as the terminator 3 of the district line K-n, the second type terminator (from resistance alone) This is to provide a detection width (voltage width) as to whether or not the terminator is connected, that is, a detection margin. If the line impedance control resistance is not increased, there is a risk of erroneous detection.

  FIG. 7 is a time chart for explaining the normal operation of the district circuit 12 of FIG. At normal time (at the time of fire detection operation) T0, the first input signal P1 from the CPU 21 is at a high level (H) and the second input signal P2 is at a low level (L). As a result, the first transistor Q1 is on and the second transistor Q2 is off. In this state, when the detector (on / off type fire detector) 2 of the district line K-n has not detected a fire and has not issued a alarm, the line voltage VIN-n is close to 24V. Since the line voltage VIN-n is higher than the reference voltage Vr1 (for example, 10.11 to 10.55 V), the output OA-n of the comparator CA-n becomes high level (H), that is, does not fire. At this time, if the detector (on / off type fire detector) 2 with the district line K-n detects a fire and issues a alarm, the line voltage VIN-n becomes close to 0 V, and the output of the comparator CA-n Since the line voltage VIN-n is smaller than the reference voltage Vr1 (for example, 10.11 to 10.55 V), OA-n becomes a low level (L), that is, a fire. In this way, fire monitoring (fire detection) can be performed at normal time (at the time of fire detection operation) T0.

  FIG. 8 shows the termination circuit 3 of the district line K-n in the district circuit 12 of FIG. 6 during the period shown by T1 in FIG. 5 separately from the normal time (fire detection period shown by T0 in FIG. 5). It is a time chart for demonstrating the 1st type | mold terminator detection operation | movement which detects whether the 1st type | mold terminator (terminator containing a capacitor | condenser) is connected. Referring to FIG. 8, at the normal time (fire detection operation) T0 as described above, the first input signal P1 from the CPU 21 is high level (H), and the second input signal P2 is low level (L). However, in the first type terminator detection operation T1, the CPU 21 maintains the second input signal P2 at the low level (L) (with the second transistor Q2 turned off). The first input signal P1 is held from a high level (H) to a low level (L) for a predetermined period (for example, 15 milliseconds). That is, a low level (L) pulse for a predetermined period (for example, 15 milliseconds) is input as the first input signal P1. Accordingly, the first transistor Q1 is also turned off (off pulse) for a predetermined period (for example, 15 msec), and the power supply voltage 24V is cut off during this period. At this time, when a first-type terminator (terminator including a capacitor) is connected as the terminator 3 of the district line K-n, discharge from the capacitor (discharge through the resistor R3-n) Therefore, the line voltage VIN-n decreases with a predetermined time constant, but since the period during which the power supply voltage 24V is cut off is as short as 15 milliseconds, for example, the line voltage VIN-n maintains 19.31V or more. The output OA-n of CA-n is at a high level (H) because the line voltage VIN-n is higher than the reference voltage Vr1 (for example, 10.11 to 10.55 V). On the other hand, when the first-type terminator (terminator including a capacitor) is not connected as the terminator 3 of the district line K-n (is disconnected or the second-type terminator is used as the terminator 3). When the power supply voltage 24V is cut off, the line voltage VIN-n is 0V and the output OA-n of the comparator CA-n is Since the voltage VIN-n is smaller than the reference voltage Vr1 (for example, 10.11 to 10.55 V), the level becomes low level (L). In FIG. 8, it is assumed that no fire is detected at normal time (at the time of fire detection operation) T0, and the line voltage VIN-n is at a non-fire level.

  FIG. 9 shows the termination circuit 3 of the district line K-n in the district circuit 12 of FIG. 6 in the period shown by T2 in FIG. 5 separately from the normal time (fire detection period shown by T0 in FIG. 5). It is a time chart for demonstrating the 2nd type | mold terminator detection operation | movement which detects whether the 2nd type | mold terminator (terminator which consists only of resistance) is connected. Referring to FIG. 9, as described above, at the normal time (fire detection operation) T0, the first input signal P1 from the CPU 21 is high level (H), and the second input signal P2 is low level (L). However, at the time of the second type terminator detection operation T2, the CPU 21 changes the first input signal P1 from the high level (H) to the low level (L) and sets the second input signal P2 to the low level (L). L) to high level (H). That is, a low level (L) pulse for a predetermined period (for example, 15 msec) is input as the first input signal P1, and a high level (H for a predetermined period (for example, 15 msec) is input as the second input signal P2. ) Input the pulse. Accordingly, the first transistor Q1 is turned off (off pulse) and the second transistor Q2 is turned on (on pulse) for a predetermined period (for example, 15 milliseconds). At this time, if a second-type terminator (terminator consisting only of resistance) is connected as the terminator 3 of the district line K-n, the resistance value of the terminator consisting only of resistance is assumed to be 10 KΩ. The line voltage VIN-n is 16.67 V or less (because it is 16.67 V when the terminator resistance value is 10 KΩ + sensor load ∞). At this time, since the reference voltage Vr2 of the comparator CB-n is 17.82V, the output OB-n of the comparator CB-n becomes low level (L). On the other hand, when the second type terminator (terminator consisting only of the resistor) is not connected as the terminator 3 of the district line K-n (is disconnected, or the first type is designated as the terminator 3). For the terminator (when a terminator including a capacitor is connected), the line voltage VIN-n is (since it is 19.83 V when the terminator resistance value ∞ + sensor load 25 KΩ), 19 The output OB-n of the comparator CB-n becomes high level (H) because the line voltage VIN-n is higher than the reference voltage Vr1 (17.82V). In FIG. 9, it is assumed that no fire is detected at normal time (at the time of fire detection operation) T0, and the line voltage VIN-n is at a non-fire level. Further, in the second type terminator detection operation, when a second type terminator (terminator consisting only of a resistor) is connected as the terminator 3 of the district line K-n, the line voltage VIN-n is The line voltage VIN-n is set to 19.83 V or more when the second type terminator (terminator consisting only of a resistor) is not connected as the terminator 3 of the district line K-n. This is because the line impedance control resistor (sensor limiting resistor) R2-n connected to the second transistor Q2 has a high resistance of 3.6 KΩ, for example. In this way, in the second type terminator detection operation, by switching the resistance for line impedance control (sensor limit resistance) from R1-n (for example, 660Ω) to R2-n (for example, 3.6KΩ), The termination detection operation can be performed reliably and reliably.

  In this way, the CPU 21 causes the fire based on the high level (H) or low level (L) outputs OA-n and OB-n from the comparator CA-n and comparator CB-n in the district circuit 12 of FIG. In addition to monitoring, the disconnection of the district line Kn is detected, and further, the termination 3 of the district line Kn is a first-type termination (a termination including a capacitor) or a second-type termination. It is also possible to identify a device (terminator consisting only of resistors).

  FIG. 10 is a flowchart for explaining processing in the CPU 21. Referring to FIG. 10, during normal operation, the CPU 21 sets the first input signal P1 to a high level (H) and the second input signal P2 to a low level (L) (step S1), and the first circuit of the district circuit 12 in FIG. The first transistor Q1 is turned on and the second transistor Q2 is turned off. In this state, as shown in the time chart of FIG. 7, the output OA-n of the comparator CA-n is monitored, and when the output OA-n of the comparator CA-n is at a high level (H), it is determined that there is no fire. When the output OA-n of the comparator CA-n becomes low level (L), it is determined that there is a fire. In this way, fire monitoring (fire detection) is performed at normal time (fire detection operation) T0.

  Then, for example, every cycle of 40 seconds, the CPU 21 performs a first type terminator detection operation for detecting whether or not the first type terminator is connected as the terminator 3 of the district line K-n in FIG. (Steps S2 to S5), and a second type terminator detection operation for detecting whether or not the second type terminator is connected as the terminator 3 of the district line K-n is shown in FIG. (Steps S6 to S9).

  That is, in the first type terminator detection operation, the second input signal P2 is maintained at the low level (L), while the first input signal P1 is set at the low level (L) (step S2). The first transistor Q1 is turned off with the twelve second transistors Q2 turned off. At this time, as shown in the time chart of FIG. 8, the output OA-n of the comparator CA-n is monitored to determine whether the output OA-n of the comparator CA-n is high level (H) or low level (L). (Step S3). When the output OA-n of the comparator CA-n is at a high level (H), the first-type terminator connection flag FLG1 is set to indicate that the first-type terminator is connected (step S4). . On the other hand, when the output OA-n of the comparator CA-n is at the low level (L), the first-type terminator connection flag FLG1 is cleared to indicate that the first-type terminator is not connected (step S5). ).

  Further, in the second type terminator detection operation, the first input signal P1 is set to the low level (L), the second input signal P2 is set to the high level (H) (step S6), and the first circuit of the district circuit 12 in FIG. The transistor Q1 is turned off and the second transistor Q2 is turned on. At this time, as shown in the time chart of FIG. 9, the output OB-n of the comparator CB-n is monitored to determine whether the output OB-n of the comparator CB-n is high level (H) or low level (L). (Step S7). When the output OB-n of the comparator CB-n is at the low level (L), the second-type terminator connection flag FLG2 is set to indicate that the second-type terminator is connected (step S8). On the other hand, when the output OB-n of the comparator CB-n is at a high level (H), the second-type terminator connection flag FLG2 is cleared to indicate that the second-type terminator is not connected (step S1). S9).

  In this way, after performing the first type termination device detection operation and the second type termination device detection operation, it is determined whether or not the first type termination device connection flag FLG1 is cleared (step S10). As a result, when the first type terminator connection flag FLG1 is not cleared (that is, when the first type terminator connection flag FLG1 is set), the first type terminator 3 of the district line K-n It is identified that the terminator is connected (step S11). On the other hand, when it is determined in step S10 that the first type terminator connection flag FLG1 is cleared, it is determined whether the second type terminator connection flag FLG2 is cleared (step S12). As a result, when the second type terminator connection flag FLG2 is not cleared (that is, when the second type terminator connection flag FLG2 is set), the second type terminator connection flag FLG2 is set as the terminator 3 of the district line K-n. It is identified that the terminator is connected (step S13). On the other hand, when it is determined in step S12 that the second-type terminator connection flag FLG2 is cleared, it is determined that the district line K-n is disconnected (step S14). That is, when both the first type terminator connection flag FLG1 and the second type terminator connection flag FLG2 are cleared, the first type terminator and the second type terminator are connected to the terminator 3 of the district line K-n. It is determined that none of the terminators are connected, thereby determining that the district line K-n is disconnected.

  When it is determined in step S14 that the district line K-n is disconnected, this can be displayed on the display unit 28, for example. Further, when the first type terminator connection flag FLG1 is set in step S10, for example, the display unit 28 displays that the first type terminator is connected as the terminator 3 of the district line Kn. be able to. When the second type terminator connection flag FLG2 is set in step S12, for example, the display unit 28 displays that the second type terminator is connected as the terminator 3 of the district line Kn. be able to.

  Thus, in the present invention, the detection result (corresponding to the output OA-n of the comparator CA-n in FIG. 6) of the first detection unit 43 (corresponding to the comparator CA-n in FIG. 6) and the second detection unit. 44 (corresponding to the comparator CB-n in FIG. 6) (corresponding to the output OB-n of the comparator CB-n in FIG. 6). And means. In more detail, the disconnection determination means indicates that the detection result of the first detection unit 43 is a detection result that the first type terminator is not connected, and the detection result of the second detection unit 44 is When it is the detection result that the second type terminator is not connected, it is determined that the district line K-n is disconnected, and the detection result of the first detection unit 43 is the first type. When it is the detection result that the terminator is connected or the detection result of the second detection unit 44 is the detection result that the second type of terminator is connected, the district line It is determined that K-n is not disconnected. In the above example, the disconnection determining means is realized by the CPU 21.

  Moreover, in this invention, when the detection result of the 1st detection part 43 is a detection result that the 1st type | mold termination device is connected, it is the 1st type as the termination | terminus device 3 of the district line K-n. When the second terminator 44 detects that the second type of terminator is connected, the end of the district line K-n is detected. It can be identified that the second type terminator is connected as the device 3.

  As described above, according to the present invention, the receiver 11 can determine whether the terminator 3 connected to the district line K-n is the first type terminator or the second type terminator. In addition, disconnection monitoring / detection of the district line K-n can be performed. In other words, in the present invention, the receiver 11 can be connected to any district line (sensor line) to which the first type terminator or the second type terminator is connected. No matter which line (sensor line) is connected, disconnection monitoring / detection of this area line (sensor line) can be performed.

  Thus, in the present invention, for example, when a receiver is replaced during renewal construction (when the terminator specifications are different in the target property), the specifications of the field terminator (whether the terminator is the first type terminator) Or it is not necessary to prepare a receiver in accordance with the second type of terminator. In other words, the receiver can be installed regardless of the specifications of the field terminator (whether the terminator is the first type or the second type), and what kind of terminator is on the line. There is no need to search for the connection, and the efficiency of the receiver replacement work can be significantly increased.

  Further, according to the present invention, the receiver 11 identifies whether the terminator 3 connected to the district line K-n is the first type terminator or the second type terminator. Can do.

  In the above example, when the first type terminator detection operation time T1, the CPU 21 holds the first input signal P1 from the high level (H) to the low level (L) for a predetermined period (for example, 15 msec). However, the predetermined period may be before the capacitor is sufficiently discharged. Therefore, the predetermined period is not limited to 15 milliseconds, and may be, for example, 5 milliseconds or 10 milliseconds.

  In the above example, at the time of the second type terminator detection operation T2, the CPU 21 inputs a low level (L) pulse for a predetermined period (for example, 15 msec) as the first input signal P1, and As the input signal P2, the high level (H) pulse for a predetermined period (for example, 15 msec) is input. However, the predetermined period is not limited to 15 msec, but may be, for example, 5 msec or 10 msec. However, it may be 30 msec.

  Further, in the above-described example, the district circuit unit 12-n of the district circuit 12 has been described in detail. However, as can be seen from the example in FIG. In the same manner as in 12-n, disconnection monitoring / detection of the district line K-1 can be performed based on the first input signal P1 and the second input signal P2. That is, the output of the comparator CA-1 and the comparator CB-1 as well as the outputs of the comparator CA-n and the comparator CB-n OA-n and OB-n of the district circuit section 12-n are output. OA-1 and OB-1 are obtained, and based on the outputs OA-1 and OB-1 of the comparator CA-1 and comparator CB-1, exactly the same as the disconnection monitoring / detection of the district line K-n, The disconnection monitoring / detection of the district line K-1 is performed, and in the receiver 11, the terminator 3 connected to the district line K-1 is either the first type terminator or the second type terminator. Regardless of whether or not there is, the disconnection monitoring / detection of the district line K-1 can be performed. More specifically, the terminator 3 connected to the district line K-1 is, for example, a first-type terminator, and the terminator 3 connected to the district line K-n is, for example, a second-type terminator. In this case, disconnection monitoring / detection of the district line K-1 and the district line K-n can be performed by one receiver 11 respectively.

  In the above example, it has been described that the sensor is a fire sensor, the receiver is a fire receiver, and the supervisory control system is for fire detection (disaster prevention system). For example, the present invention can also be applied to a case where the detector is a crime prevention sensor, the receiver is a crime prevention receiver, and the surveillance control system is intended for crime prevention (a crime prevention system).

  In the above example, the district line is a sensor line to which a sensor is connected. However, the present invention is not limited to a sensor line as long as it is a line to which a terminator is connected. It can be applied to any line and system disconnection detection. For example, the present invention can be applied to a system to which a terminator in a repeater is connected.

  The present invention can be used for disaster prevention systems, crime prevention systems, and the like.

2 Sensor 3 Terminator 11 Receiver 12 District Circuit 13 Smoke Prevention Circuit 14 District Acoustic Circuit 15 Transfer Circuit 21 CPU
22 ROM
23 RAM
24 EEPROM
27 operation unit 28 display unit 29 alarm sound unit 31, 32, 33, 34 I / O unit 41 first transmission unit 42 second transmission unit 43 first detection unit 44 second detection unit 45 fire detection unit K -1 to K-N district line

Claims (8)

A receiver having a function of monitoring and controlling a connected line, for detecting whether or not a first-type terminator is connected as a terminator of the line. A first transmission means for transmitting a signal to the line, and a second-type terminator detection signal for detecting whether or not a second-type terminator is connected as a terminator of the line to the line. Based on a response from the line when the second transmission means for transmitting and the first type terminator detection signal is transmitted to the line by the first transmission means, the first type as a terminator of the line Based on the response from the line when the first detection means for detecting whether or not the terminator is connected, and the second type terminator detection signal is transmitted to the line by the second transmission means, A second type of terminator is connected as the terminator of the line. Receiver, characterized by comprising a second detecting means for detecting whether or not. 2. The receiver according to claim 1, further comprising: a disconnection determining unit configured to determine whether or not the line is disconnected based on a detection result of the first detection unit and a detection result of the second detection unit. A receiver further comprising: 3. The receiver according to claim 2, wherein the disconnection determination unit is a detection result that the first detection unit is not connected to the detection result of the first detection unit, and the second When the detection result of the detection means is a detection result that the second type terminator is not connected, it is determined that the line is disconnected, and the detection result of the first detection means is When it is a detection result that one type of terminator is connected, or when a detection result of the second detection means is a detection result that a second type of terminator is connected A receiver for determining that the line is not disconnected. 2. The receiver according to claim 1, wherein when the detection result of the first detection means is a detection result that the first type of terminator is connected, the first type of terminator is used as the terminator of the line. When it is identified that a terminator is connected, and the detection result of the second detection means is a detection result that a second type of terminator is connected, a second terminator is used as the line terminator. A receiver characterized by identifying that a terminator is connected. 5. The receiver according to claim 1, wherein the first-type terminator detection signal transmitted to the line by the first transmission unit, and the second transmission unit The receiver of the type 2 terminator detection signal transmitted to the line is alternately transmitted to the line at different timings. 6. The receiver according to claim 1, wherein the first type of terminator includes a capacitor, and the second type of terminator includes only a resistor. And receiver. The receiver according to claim 6, wherein a resistance for line impedance control is provided between the first transmission unit and the second transmission unit and the line, and the second transmission unit includes: When the second type terminator detection signal is transmitted to the line, the line impedance control resistor is compared to when the first type terminator detection signal is transmitted to the line by the first transmission means. A receiver characterized by increasing the size. A monitoring control system comprising the receiver according to any one of claims 1 to 7.

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