JP3816643B2 - Disconnection monitoring system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disconnection monitoring system for monitoring the disconnection of parallel transmission lines composed of a plurality of bit lines connecting the controlled device disaster display panel or the like and a control device for receiving board or the like.
[0002]
[Prior art]
Conventionally, in a disaster prevention monitoring system that centrally monitors abnormalities such as fires, for example, a disaster prevention display panel is connected to the receiving panel using an 8-bit parallel transmission line, and 8-bit parallel display data is received from the receiving panel. The information is transmitted to the disaster prevention display panel and controlled.
Thus, about the transmission line used by the disaster prevention monitoring system, the disconnection monitoring of the transmission line is performed in order to guarantee the reliability of an apparatus.
[0003]
Conventionally, as a disconnection monitoring method for a parallel transmission line used in a disaster prevention monitoring system, there are a method using the software shown in FIG. 6 and a method using the hardware shown in FIG.
In the disconnection monitoring by software in FIG. 6, the operation / display unit 102, the MPU unit 103, and the IF unit 104 are provided in the control device 100, the IF unit 106 and the MPU unit 107 are provided in the controlled device 101, and both IF units 105, 108 are connected by, for example, a transmission parallel transmission line 105 and a response parallel transmission line 108.
[0004]
When controlling the controlled device 101 from the control device 100, a parallel control signal is transmitted from the MPU unit 103 through the IF unit 104, and the parallel control signal received by the MPU 107 of the controlled unit 101 is decoded to perform a predetermined operation. Do.
In the disconnection monitoring, the validity of the parallel control signal received by the controlled device 101 is judged by checking the horizontal parity or the vertical parity, and when the error is judged, the judgment result is notified from the MPU 107 to the control device 100 through the IF unit 106. Then, disconnection display is performed on the operation / display unit 102.
[0005]
7 is provided with the MPU unit 103, the IF unit 104, the disconnection detection circuit 110, the relay circuit 111, the timer circuit 112, the display unit 113, and the operation unit 114 in the control device 100, and the controlled device 101. In addition, an IF unit 106, an MPU unit 107, a relay circuit 115, and a timer circuit 116 are provided. Here, the disconnection detection circuit 110 and the relay circuits 111 and 115 are required by the number of signal lines of the parallel transmission line 109.
[0006]
Normally, the relay circuit 111 of the control device 100 and the relay circuit 115 of the controlled device 101 are closed to the MPU units 103 and 107 as shown in the figure, and a parallel control signal is transmitted from the MPU unit 103 through the IF unit 104. The parallel control signal received by the MPU 107 of the controlled apparatus 101 is decoded to perform a predetermined operation.
Disconnection monitoring is performed by timing control of the timer circuits 112 and 116. At the disconnection monitoring timing, the relay circuits 111 and 115 are disconnected from the MPU units 103 and 107 by the outputs of the timers 112 and 116, and switched to the disconnection monitoring side. Therefore, a monitoring current is supplied from the disconnection detection circuit 110 of the control device 100 to the controlled device 101 via each signal line of the parallel transmission line 109, the presence or absence of disconnection is detected from the current value, and a display is displayed when the disconnection is detected. Disconnection display is performed on the unit 113.
[0007]
[Problems to be solved by the invention]
However, in the disconnection monitoring by the software shown in FIG. 6, a disconnection monitoring program must be prepared separately from the main program, and it is difficult to verify the validity of the received signal by the program. An extremely heavy load is placed on the MPU unit on the apparatus side. There is also a problem that it is impossible to distinguish between a case where a signal is broken due to noise and a disconnection.
[0008]
In the disconnection monitoring by the hardware of FIG. 7, one detection circuit is required for each signal line of the parallel signal line, and the number of detection circuits increases as the number of signal lines increases according to the number of bits. There was a problem that the scale and cost of the circuit became larger than necessary. The present invention In view of such a conventional problem which has been made, to provide a disconnection monitoring system to ensure that a parallel transmission line disconnection monitoring with reduced burden of software and hardware to a minimum With the goal.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the present invention is configured as follows. First, the present invention is directed to a disconnection monitoring system for monitoring disconnection of a parallel transmission line composed of a plurality of bit lines connecting a control device and a controlled device. In the present invention for such a disaster prevention monitoring system, a disconnection monitoring signal transmission unit that transmits a parallel bit signal of the same logic level to all bit lines of a parallel transmission line as a disconnection monitoring signal, and provided in a controlled device, A disconnection information response circuit that generates a 1-bit disconnection response information by logical operation of received signals of all the bit lines of the parallel transmission line and returns it to the control device through a dedicated disconnection information response line, and a disconnection information provided in the control device. A disconnection detection circuit that detects the presence or absence of disconnection of the parallel transmission line based on the 1-bit disconnection response information returned from the response circuit, and the disconnection monitoring signal transmission unit generates a control information transmission request to the controlled device In this case, prior to transmission of the control information, a disconnection monitoring signal is transmitted to the parallel transmission line so that disconnection monitoring is performed .
[0010]
Here, the disconnection information response circuit generates a 1-bit disconnection response information by taking a logical sum or logical product (including no logical sum or no logical product) of received signals of all bit lines of the parallel transmission line. Return to the control unit. According to such a disconnection monitoring system of the present invention, a disconnection monitoring signal in which all bits are fixed to 0 or 1 is sent from the control device, and this is received by the controlled device and is returned as a logical sum or logical product. Accordingly, it is possible to detect the disconnection of the signal line, and it is only necessary to provide a logic circuit for disconnection information response on the controlled device side as hardware, and the circuit configuration is simple and can be realized at low cost.
[0011]
Even if the number of signal lines increases according to the number of bits, a simple circuit change in which the number of inputs to the logic circuit of the controlled device is sufficient. Furthermore, disconnection monitoring, because it relies primarily on hardware, Ru can less the burden on the MPU.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram of a disaster prevention monitoring system to which disconnection monitoring of the present invention is applied. In FIG. 1, the disaster prevention reception board 1 is installed in a manager or the like, and the reception board MPU 2, terminal transmission unit 3, terminal control unit 4, operation unit 5, display unit 6, display panel transmission unit 7, serial message transmission unit 8 and a parallel transfer section 9.
[0014]
A terminal transmission line 10 is drawn out from the terminal transmission unit 3 of the disaster prevention receiving board 1 to a warning area, and a fire detector 12 is connected to the terminal transmission line 10 via a repeater 11. Further, a terminal transmission path 13 is drawn out from the terminal control unit 4 of the disaster prevention receiver 1, and a terminal device 15 such as a smoke prevention device is connected to the terminal transmission path 13 via a repeater 14.
The receiving board MPU 2 controls the terminal transmission unit 3 in a steady monitoring state, sequentially designates the addresses of the repeaters 11 connected to the terminal transmission path 10, and collects detection information of the fire detector 12. When a fire is judged from the detection information of the fire detector at a specific address by collecting the detection information of the fire detector 12, a fire alarm is displayed on the display unit 6 and the terminal device 15 is used for terminal equipment 15 such as smoke prevention. The terminal device 15 that designates a specific repeater 14 of the terminal transmission path 13 by address designation to the control unit 4 is controlled.
[0015]
Further, the receiving board MPU2 outputs a transmission signal by using the serial transmission unit 8 or the parallel transmission unit 9 in order to transmit or control the detection information to other equipment accompanying the fire determination. The serial transfer unit 8 transfers transfer data to serial bits. The parallel transmission unit 9 outputs a transmission signal corresponding to 1 bit per line.
A disaster prevention display board 16 is connected to the display board transmission section 7 of the disaster prevention reception board 1 via a parallel transmission line 20. The disaster prevention display board 16 is provided with a receiving board transmission part 17, a display board 18 and a display part 19. The receiving board MPU 2 of the disaster prevention receiving board 1 sends display information equivalent to the display unit 6 provided in the disaster prevention receiving board 1 to the disaster prevention display board 16 to be displayed on the display unit 19. The disconnection monitoring of the present invention is applied to the parallel transmission line 20 connecting the disaster prevention receiving board 1 and the disaster prevention display board 16.
[0016]
FIG. 2 is a block diagram of a parallel transmission line between the disaster prevention receiving board 1 and the disaster prevention display board 16 and its disconnection monitoring function in the disaster prevention monitoring system of FIG. In FIG. 2, the disaster prevention receiving board 1 becomes a control device in disconnection monitoring, and the disaster prevention display board 16 becomes a non-control device in disconnection monitoring. The disaster prevention reception board 1 as a control device is provided with a reception board MPU2, and the reception board MPU2 is provided with functions of a reception control unit 24 and a disconnection monitoring signal transmission unit 25 realized by program control.
[0017]
A parallel bus having a predetermined number of bits from the receiving board MPU 2 is connected to the display board transmission unit 7, further connected to the parallel transmission line 20 through the connector 21, and connected to the disaster prevention display board 16 through the connector 22. Even in the disaster prevention display panel 16, each signal line of the parallel transmission line 20 connected by the connector 22 is input-connected to the reception panel transmission unit 17 and then connected to the display panel 18 by a bus.
[0018]
The disconnection monitoring signal transmission unit 25 provided in the reception panel MPU2 of the disaster prevention reception panel 1 is disconnected prior to transmission of control information when a transmission request for display control occurs from the disaster prevention reception panel 1 to the disaster prevention display panel 16. Send a monitoring signal. This disconnection monitoring signal is a signal in which all bit signals of all signal lines constituting the parallel transmission line 20 are fixed to a predetermined logic level, for example, bit 0 or bit 1.
[0019]
Further, when there is no request for transmission of control information to the disaster prevention display panel 16, the disconnection monitoring signal transmission unit 25 transmits a disconnection monitoring signal in the same manner at each predetermined disconnection monitoring timing by a timer setting. Do.
A disconnection information response circuit 27 is provided on the disaster prevention display panel 16 side serving as a controlled device. The disconnection information response circuit 27 inputs the bit reception signal of each signal line of the parallel transmission line 20 received by the receiving board transmission unit 17 in parallel, and performs a logical operation of logical product or logical sum of the received bit signals, for example, no A logical operation of logical product (NAND) is performed to generate 1-bit disconnection response information, and this is returned to the disaster prevention receiving board 1 as a control device through the receiving board transmission unit 17 through a dedicated disconnection information response line 23. ing.
[0020]
The 1-bit disconnection response information signal returned by the disconnection information response line 23 is input to the disconnection detection circuit 26 through the display panel transmission unit 7, and the disconnection detection circuit 26 detects whether the parallel transmission line 20 is disconnected. Then, the detection result is given to the reception control unit 24 of the receiving board MPU2. When the reception control unit 24 recognizes the disconnection detection of the parallel transmission line 20 from the disconnection detection circuit 26, the reception control unit 24 displays a disconnection display on the display unit 6 shown in FIG.
[0021]
FIG. 3 is a specific circuit diagram of the disconnection information response circuit 27 provided in the disaster prevention display panel 16 of FIG. In FIG. 3, the receiver circuit 29 is provided in the receiving board transmission unit 17, and in this embodiment, the parallel transmission line 20 is inputted with parallel signals by 12 signal lines IE, ID, A0 to A10. The signal is amplified by the receiver circuit 29 and then output to the display panel 18 side.
[0022]
An output line from the receiver circuit 29 is branched to the disconnection information response circuit 27 side and is input to a NAND gate 28 provided in the disconnection information response circuit 27. The output of the NAND gate 28 is input to the base of the transistor Q1 functioning as a transmission driver via the diode D1 and inverters N1 and N2, and is sent to the disaster prevention receiving board 1 side via the disconnection information response line 23 connected to the collector of the transistor Q1. A 1-bit disconnection information response signal indicating disconnection response information is transmitted. R1, R2, and R3 are resistors.
[0023]
If the disconnection monitoring signal is output from the disaster prevention receiving board 1 of FIG. 2 as a disconnection monitoring signal with all bits of the parallel transmission line 20 set to bit 0, if all the signal lines of the parallel transmission line 20 are normal, The reception outputs inverted by the NAND gate incorporated in the receiver circuit 29 of FIG. 3 are all bit 1, and the output of the NAND gate 28 provided in the disconnection information response circuit 27 is bit 0.
[0024]
Bit 0 which is the output of NAND gate 28 is inverted by inverters N1 and N2 and becomes bit 0, that is, an L level input to transistor Q1, so that transistor Q1 is turned off and disconnection information response line 23 is set to H indicating bit 1. Pull up to the level via the resistor R2, and send a 1-bit disconnection information response signal.
On the other hand, if one of the signal lines of the parallel transmission line 20 is disconnected, one of the inputs to the NAND gate 28 becomes bit 1, so that the output of the NAND gate 28 changes from bit 1 to bit 0 when normal. Invert. Therefore, the signal level with respect to the base of the transistor Q1 by the inverters N1 and N2 becomes the H level corresponding to the bit 1, so that the transistor Q1 is turned on and the disconnection information response signal that becomes the L level corresponding to the bit 0 is the disaster prevention receiving board 1. It is transmitted to the side via the disconnection information response line 23.
[0025]
The disconnection detection circuit 26 provided in the disaster prevention receiver 1 of FIG. 2 determines that the parallel transmission line 20 is normal if the 1-bit received signal from the disconnection information response line 23 is at the H level corresponding to the bit 1. No disconnection detection signal is output. On the other hand, when the disconnection information response signal is L level indicating bit 0, it is determined that the parallel transmission line 20 is disconnected, and a disconnection detection signal is output. In the reception control unit 24 of the receiving board MPU2, the detection signal of the disconnection detection circuit 26 is taken in at the timing when the disconnection monitoring signal transmission unit 25 transmits the disconnection monitoring signal. If bit 0, it is determined that the wire is broken, and the wire break display is performed.
[0026]
FIG. 4 is a flowchart of the control operation for the disaster prevention display board including disconnection monitoring by the receiving board MPU2 provided in the disaster prevention receiving board 1 of FIG. First, in step S1, it is checked whether or not it is a disconnection detection timing. In the case of the disconnection detection timing, in step S2, all control signals for the disaster prevention display panel 16 are set to bits 0 or 1, and a parallel transmission line is used as a disconnection monitoring signal. 20 to output.
[0027]
Here, in the disaster prevention receiving board 1, all bits are set to 0 as a disconnection monitoring signal for the parallel transmission line 20. Therefore, in the disaster prevention display panel side of FIG. Although the signal becomes a signal input in which the bit becomes 0, since the receiver circuit 29 includes an inverter for each signal line as a driver, all disconnection monitoring signals output from the receiver circuit 29 by the inversion by the inverter are bit 1. It becomes.
[0028]
Therefore, if the parallel transmission line 20 is not disconnected, the output of the NAND gate 28 of the disconnection information response circuit 27 becomes bit 0, the transistor Q1 is turned off by the inverters N1 and N2, and the signal level of the disconnection information response line 23 by the trap resistor R2. Is set to the H level corresponding to bit 1.
Therefore, in step S3 of FIG. 4, the detection output of the disconnection detection circuit 26 is read at the transmission output timing in which all bits of the control signal as the disconnection monitoring signal are bit 0, and whether or not disconnection is detected in step S4. To determine. That is, if the detection signal of the disconnection detection circuit 26 is bit 1, it is determined that there is no disconnection in the parallel transmission line 20, and the process proceeds to step S5. If the disconnection detection signal is bit 0, disconnection is detected. In step S11, the transmission of the control signal to the controlled device 16 is stopped. In step S12, the disconnection display of the transmission cable of the parallel transmission line 20 is displayed.
[0029]
On the other hand, if it is not the disconnection detection timing in step S1, the process proceeds to step S5, where it is checked whether there is a transmission request instruction for control to the controlled device 16. If there is a transmission request instruction, the control signal is set to all bits 0 in step S6, the disconnection monitoring signal is output to the parallel transmission line 20, the output of the disconnection detection circuit 26 is checked in step S7, and step S8 is performed. To determine whether or not a disconnection is detected.
[0030]
If disconnection is not detected at this time, in step S9, the instruction content is set in the control signal for the disaster prevention display board 16 and output to the parallel transmission line 20, thereby transmitting control information to the disaster prevention display board 16 and performing a predetermined operation. To do. If disconnection is detected in step S8, control of the controlled device 16 is stopped in step S11, and a disconnection display of the transmission cable is performed in step S12. Subsequently, in step S10, the presence or absence of an apparatus stop instruction is checked. The processes in steps S1 to S9, S11, and S12 are repeated until the apparatus stop instruction is issued. When the apparatus stop instruction is issued, the stop process is performed in step S13. Thereafter, the series of processing is terminated.
[0031]
FIG. 5 is a block diagram of another disaster prevention monitoring system to which disconnection monitoring of the present invention is applied. In this disaster prevention monitoring system, a distributed system in which a plurality of relay boards 32 are connected to the main transmission line 31 drawn from the disaster prevention receiving board 30 is configured. As with the receiver 1 of the disaster prevention monitoring system of FIG. 1, terminal transmission lines 10 and 13 are drawn out from the relay panel 32. The fire detector 12 is connected to the terminal transmission line 10 via the repeater 11, and the terminal A terminal device 15 is connected to the transmission line 13 via a repeater 14.
[0032]
The relay panel 32 collects detection information of the fire detector 12 of the corresponding repeater 11 by address designation to the terminal transmission path 10 and performs fire monitoring. When a fire is judged, a predetermined repeater address is designated by the terminal transmission path 13. Then, the terminal device 15 is controlled, and at the same time, the fire detection information is transmitted to the disaster prevention receiving board 30 through the main transmission line 31 to display an alarm.
[0033]
A disaster prevention display board 33 is connected to the disaster prevention reception board 30 via the parallel transmission line 20. The disaster prevention receiving board 30 becomes the control apparatus 1 of FIG. 2 in the disconnection monitoring of the present invention, and the disaster prevention display board 33 becomes the controlled apparatus of FIG. 2 in the disconnection monitoring of the present invention. The configuration for disaster prevention monitoring of the present invention is applied to the parallel transmission line 20 connecting the disaster prevention receiving board 30 and the disaster prevention display board 33 as in the embodiment of FIG. In addition to this, connection by the disconnection information response line 23 is also performed.
[0034]
In addition, although said embodiment took the disconnection monitoring about the parallel transmission line which connects between the receiving board and disaster prevention display board in a disaster prevention monitoring system as an example, this invention is not limited to this, The present invention can be applied as it is to disconnection monitoring of a parallel transmission line connecting an appropriate control device and a controlled device.
[0035]
【The invention's effect】
As described above, according to the present invention, a disconnection monitoring signal in which all the bits are fixed to 0 or 1 is sent from the control device to the controlled device side, and this is received by the controlled device side to receive the logical sum or logical product. It is possible to detect the disconnection of the signal line of the parallel transmission line by sending back and return the logical product or logical sum of the received signals of each signal line of the parallel transmission line to the controlled device side as hardware For this reason, the circuit configuration is simple and can be realized at low cost.
[0036]
Even if the number of signal lines increases according to the number of bits for parallel transmission, a simple circuit change is required to increase the input of the logic circuit on the controlled device side, and the signal lines corresponding to the number of bits of the parallel transmission line Even a large number can be realized with a simple circuit configuration and at a low cost. Furthermore, since the disconnection monitoring mainly depends on hardware, the burden on the MPU on the control device side can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of a disaster prevention monitoring system to which disconnection monitoring of the present invention is applied. FIG. 2 is a block diagram of an embodiment of the present invention applied to transmission between the receiving board and disaster prevention monitoring board of FIG. FIG. 4 is a specific circuit diagram of a disconnection information response circuit provided in the disaster prevention display panel of FIG. 2. FIG. 4 is a flowchart of MPU control processing of the control device of FIG. Block diagram of disaster prevention monitoring system in Japan [Fig. 6] Block diagram of conventional disconnection monitoring by software [Fig. 7] Block diagram of conventional disconnection monitoring by hardware [Explanation of symbols]
1,30: Disaster prevention reception board (control device)
2: Receiver MPU
3: terminal transmission unit 4: terminal control unit 5: operation unit 6: display unit 7: display panel transmission unit 8: serial transmission unit 9: parallel transmission unit 10, 10: terminal transmission path 11, 14: repeater 12 : Fire detector 15: Control device 16, 33: Disaster prevention display panel (controlled device)
17: Reception board transmission section 18: Display board 19: Display section 20: Parallel transmission lines 21, 22: Connector 23: Disconnection information response line 24: Reception control section 25: Disconnection monitoring signal transmission section 26: Disconnection detection circuit 27: Disconnection Information response unit 31: trunk transmission line 32: relay panel

Claims (3)

In a disconnection monitoring system for monitoring disconnection of a parallel transmission line composed of a plurality of bit lines connecting between a control device and a controlled device,
A disconnection monitoring signal transmitting unit that is provided in the control device and transmits parallel bit signals of the same logic level to all bit lines of the parallel transmission line as a disconnection monitoring signal;
Disconnection information response circuit provided in the controlled device for generating 1-bit disconnection response information by logical operation of received signals of all bit lines of the parallel transmission line and returning it to the control device through a dedicated disconnection information response line When,
A disconnection detection circuit that is provided in the control device and detects the presence or absence of disconnection of the parallel transmission line based on a 1-bit disconnection response information returned from the disconnection information response circuit;
With
The disconnection monitoring signal transmission unit transmits the disconnection monitoring signal to the parallel transmission line to perform disconnection monitoring prior to transmission of the control information when a control information transmission request to the controlled device is generated. Disconnection monitoring system characterized by that.   2. The disconnection monitoring system according to claim 1, wherein the disconnection information response circuit generates 1-bit disconnection monitoring information by taking a logical sum or logical product of reception signals of all bit lines of the parallel transmission line. A disconnection monitoring system, wherein the disconnection monitoring system is returned to the control device.   2. The disconnection monitoring system according to claim 1, wherein the control device is a receiving panel of a disaster prevention monitoring system, and the controlled device is a disaster prevention display panel connected to the receiving panel by the parallel transmission line. Disconnection monitoring system.

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