JPH0262699A - Disaster preventing monitor - Google Patents

Abstract

PURPOSE:To promptly and appropriately send information to a transmission line by determining that time for sending a false signal by a repeating panel having the highest priority can be long even when plural repeating panels respectively having different priorities simultaneously send false signals to the transmission line at a point where the transmission line becomes empty. CONSTITUTION:When transmission requests are simultaneously generated in repeating panels No.1 and No.2 at a time of day t1, both the sending of the first jam signal in the repeating panel No.1 and that in the repeating panel No.2 are respectively executed extending over fixed time T0. Here, since the priority of the information of the repeating panel No.2 is higher, the number of the times of sending the jam signal (n) is set to n=2, and at a point where the sending of the first jam signal ends in the repeating panel No.1 having a lower priority, the repeating panel No.2 having the higher priority still continues the sending of the jam signal. Therefore, since the signal exists on the transmission line in the repeating panel No.1 having the lower priority, the repeating panel No.1 becomes a signal sending standby state. On the other hand, since no transmitting information exists on the transmission line at a point where the sending of the second jam signal ends in the repeating panel No.2 having the higher priority, the repeating panel No.2 sends data based on self disaster preventing information to the transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a distributed disaster prevention monitoring device that transmits disaster prevention information between receivers by connecting a repeater panel to a receiver using a repeater.

[Conventional technology] Conventionally, this type of distributed disaster prevention monitoring equipment has a system configuration in which a repeater board to which multiple terminal devices are connected is loop-connected to a receiver via a transmission path. When an abnormality such as a fire is detected by the terminal equipment of the relay board, disaster prevention information is transmitted from the relay board to the receiver via the transmission line and an alarm is displayed. It is designed to transmit control information for controlling and driving.

In other words, distributed processing is realized in which each of the receivers and repeaters connected in a loop via the transmission path autonomously transmits information to the respective units and mutually monitors each other for disaster prevention.

By the way, in such conventional distributed disaster prevention monitoring equipment, the receivers and relay boards mutually transmit information using a common transmission path connected in a loop, so multiple relay boards transmit information at the same time. If information is sent over the transmission path, signal collision will occur on the transmission path, destroying the transmitted information and making transmission impossible.

In order to avoid signal collisions on the transmission path,
The relay board is equipped with a monitoring function to monitor whether transmission information exists on the transmission path, detects a state where no transmission information exists on the transmission path, that is, an empty state of the transmission path, and sends its own information to the transmission path. One possible method is to do so.

[Problems to be Solved by the Invention] However, in a method that detects the empty state of a transmission line and sends its own information to the transmission line, it waits until another relay board finishes using the transmission line and then transmits its own information to the transmission line. Because information is transmitted, the waiting time for transmission becomes long, and there is a risk that the delay in transmitting disaster prevention information that requires urgent processing may become significant.

In particular, if multiple relay boards are used to check for a vacant transmission line, when the transmission line becomes vacant, the multiple relay panels will compete for the transmission line, and during that time, another relay board will connect to the transmission line. It is expected that the information will be transmitted, and there is a problem in that the system will be in a waiting state for a long time.

In addition, as the number of repeater boards increases, there is a possibility that multiple repeater boards will simultaneously detect the availability of the transmission line and send out their own information at the same timing. In systems that send out their own information onto a transmission path, countermeasures against signal collisions on the transmission path have not necessarily been sufficient.

The present invention has been made in view of such conventional problems, and provides a disaster prevention monitoring device that can quickly and appropriately send information to a transmission path even if a signal collision occurs on the transmission path. The purpose is to

[Means for Solving the Problems] In order to achieve this object, in the present invention, a plurality of repeater panels connected to a plurality of terminal devices are loop-connected to a receiver via a transmission path, and the receiver and In a disaster prevention monitoring device that mutually transmits information between multiple relay boards via the transmission path, the relay board receives information transmitted from another relay board other than its own relay board on the transmission path. monitoring means for monitoring whether the transmission information exists or not: a pseudo signal for occupying the transmission path for a predetermined period of time when the monitoring means detects the absence of transmission information from the other relay board on the transmission path; and a first transmission control means for transmitting its own information to the transmission path after transmitting the pseudo signal; when the pseudo signal is sent, the monitoring means controls the other relay board on the transmission path; When detecting a pseudo signal from a user, the pseudo signal is sent out for a period of time according to the priority set for the user's own information, and if the priority of the user's information is high, the user's information is transmitted after the pseudo signal is detected. a second transmission control means for sending out the signal to the transmission path;
When the second transmission control means sends its own information to the transmission path, if the priority of the own information and the transmission information of the other relay board are the same, the second transmission control means transmits its own information to the transmission path for a predetermined period of time obtained by random number processing. and third transmission control means for restarting the sending of the pseudo signal and information by the second transmission control means after stopping the information transmission to the transmission path.

Here, the sending time of the pseudo signal based on the second transmission control time is set so that the higher the priority, the longer the time.

Furthermore, instead of random number processing in the third transmission control means, a different second priority is set for repeaters having the same priority, and information is sent to the transmission path only for the time according to this second priority. The second transmission control means may be restarted after providing a free time during which no transmission is performed.

[Function] In the disaster prevention monitoring device of the present invention having such a configuration, first, when attempting to send information from the relay board to the transmission path, if there is no transmitted information on the transmission path, the system immediately sends the information to the transmission path. Sends its own information to the transmission path.

On the other hand, when multiple repeaters send information to the transmission line at the same time, they send a pseudo signal, such as a jam code, to occupy the transmission line for a predetermined period of time according to the priority set for themselves. When there is no transmission information on the transmission path at the end of the transmission and pseudo signal transmission, it sends its own information to the transmission path.

In other words, even if multiple relay boards with different priorities send out pseudo signals to the transmission path at the same time when the transmission path becomes vacant, the transmission time of the pseudo signal by the relay board with the highest priority is determined to be longer. Therefore, when a relay board with a lower priority finishes sending out pseudo signals, the relay board with a higher priority continues to send out pseudo signals, and as a result, the relay board with the highest priority continues to send out pseudo signals. When the transmission of the pseudo signal is finished, no transmission information exists on the transmission path, and therefore, the original information can be sent out from the relay board with the highest priority to the transmission path.

Furthermore, if a signal collision occurs regarding information from repeaters with the same priority, the signal collision will occur again if pseudo signals are sent according to the priority, so in this case, each repeater Perform random number processing to obtain different random numbers,
Each relay board will repeat the original information transmission following the transmission of the pseudo signal according to the priority after the idle time according to the random value obtained has elapsed, and the end point of sending the next pseudo signal will be determined according to the random value. Since the information differs in time, the original information can be sent to the transmission path from the repeater board where the low random number value is determined.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the system configuration of the present invention.

In FIG. 1, 1 is a receiver, 2-1 to 2-5 are relay boards, and the receiver 1 and the relay boards 2-1 to 2-5 are connected in a loop via a transmission line 3.

Relay boards 2-1 to 2-5 are installed, for example, on each floor of a building, and as shown in the example of relay board 2-1, relay boards 2-1 to 2-5 are installed on each floor of a building.
A plurality of terminal devices 6 are connected to the signal line 4 drawn out from the signal line 1 via a repeater 5, and the terminal devices 6 are composed of a sensor, a fire door, a smoke prevention damper, and the like. Also, relay board 2-1
The relay device 5 is called by a polling method via the signal line 4 to collect detection information and control drive of the corresponding terminal device 6.

FIG. 2 is a block diagram showing an embodiment of the relay board 2-1 provided in FIG. 1.

In FIG. 2, a relay board 2-1 is provided with a CPU 10 as a relay board control unit, and a terminal device 6 is connected to the CPU 10 via a transmission interface 12 via a signal line 4 via a repeater 5. .

A transmission line 3 loop-connected to the receiver 1 is input/output connected to the relay board 2-1, and in FIG. 2, the input side transmission line is shown as 3a, and the output side transmission line is shown as 3b. ing.

The input side transmission line 3a and the output side transmission line 3b for the relay board 2-1 are connected to changeover switches 14a and 14b, and the changeover switches 14a and 14b have changeover terminals a and b, and in the steady monitoring state, they are not switched. The switches 14a and 14b are closed to the switching position a shown by the solid line. Changeover switch 14a
, 14b are connected by a bypass line 16, and by switching the changeover switches 14a and 14b to the switching positions indicated by broken lines, the CPU 10 is disconnected from the transmission line 3, and the transmission lines 3a and 3b are connected to the bypass line 16. Allows for bypass connection via.

The CPU 10 also has an input port 11 connected to the input side transmission line 3a via a changeover switch 14a, and receives transmission data sent via the transmission line 3 to the input port 11. Further, the signal line from the changeover terminal a of the changeover switch 14a is input to one side of the AND gate 18, and the
The other inverting input of the gate 18 is connected to the control port C1 of the CPU 10. The control port C1 becomes H level when sending data from the CPU 10 to the transmission line 3, and the AN
When the D gate 18 is disabled and data is not sent from the CPU 10 to the transmission line 3, the control port C is disabled.
1 becomes the L level and puts the AND gate 18 in the permissive state. The output of the AND gate 18 is input to one of the OR gates 20, and the other input of the OR gate 20 is connected to the output port 01 of the CPU 10. Further, the output of the OR gate 20 is input to the decoder 22, and the decoder 22
It is controlled by a control signal from the control port C2 of 10. That is, when the CPU 10 does not transmit data, the control port C2 is set to the L level, and the decoder 22 allows the transmitted data obtained from the other relay board or the receiver 1 via the OR gate 20 to pass through as is. On the other hand, CPUl0
When sending data to the transmission path, control port C2 becomes H.
At this time, the transmission data output from the output port 01 is inputted via the OR gate 20, modulated according to the data bit, and transmitted to the transmission path. Of course, C
When the PU 10 sends data from the output port 01, the control port C1 becomes H level and the AND gate 18 is inhibited.

Furthermore, a watchdog circuit 24 is provided for the CPU 10. The watchdog circuit 24 detects the runaway of the CPU10. When the CPU10 is operating normally, a pulse is output to the watchdog circuit 24 at a constant cycle, but when the CPU10 runs out of control, a pulse is output to the watchdog circuit 24. Since the pulse output stops, the watchdog circuit 24 detects runaway of the CPUO based on the stop of the pulse output, and switches the changeover switches 14a and 14b from the changeover terminal a to the changeover terminal on the bypass line 16 side shown by the broken line. The CPU that caused the runaway is now disconnected from the transmission line 3.

Furthermore, a fault detection circuit 26 is provided for the CPU10, and the line voltage of the transmission line 3b on the output stage side of the decoder 22 is input to the fault detection circuit 26, and a short circuit or disconnection on the output side transmission line 3b side is detected. Then, the CPU 10 is notified of the line fault and is caused to perform recovery processing if necessary.

When the CPU 10 installed in such a relay panel 2-1 receives disaster prevention detection information, such as fire detection information, from the device 6 via the transmission interface 12, the appropriate terminal transmits the disaster prevention information using the following control functions. It will be sent out on the road.

That is, CPU10 is provided with the following four control functions.

(A) A monitoring function that monitors the presence or absence of transmitted information from relay panels other than the own relay panel on the transmission path: (B) A monitoring function that monitors the presence or absence of transmitted information from other relay panels on the transmission path. When detected, a first transmission control unit sends out a pseudo signal to occupy the transmission path for a predetermined period of time, and sends out its own information to the transmission path after sending out this pseudo signal.
(C) When sending out a pseudo signal, if the monitoring function detects a pseudo signal from the relay board on the transmission path, the pseudo signal will be transmitted for a period of time according to the priority set for the own information. (D) A second transmission control function that sends out its own information to the transmission path when the priority of its own information is high, and sends out its own information to the transmission path even when the pseudo signal is sent. When transmitting information, if the priority level of the own information and the transmission information of another relay board is the same, the second relay board stops transmitting information to the transmission path for a predetermined time according to random number processing.
A third transmission control function that restarts the sending of pseudo signals and information by the transmission control function of and explain.

In FIG. 3, the CPU 10 monitors in step S1 whether or not there is a transmission request, that is, whether an abnormality such as a fire is detected from the terminal device 6 connected to the relay board, and a transmission request is obtained based on the abnormality detection. Then, the process proceeds to step S2, and the presence or absence of a signal on the transmission path is checked. Next, step S
When it is confirmed in step S3 that there is no signal on the transmission path for a certain period of time, the process proceeds to step S4, where a jam signal is sent to the transmission path for a certain period of time. This jam signal is a pseudo signal sent to occupy the transmission line prior to sending disaster prevention information, and the sending time of the jam signal in step S4 is fixed for all repeaters.

It is scientifically determined as a certain amount of time.

Subsequently, when the transmission of the jam signal is finished in step S4, the process proceeds to step S5 to check whether there is a signal collision on the transmission path, and if there is no signal collision, the process proceeds to step S6 to send data transmission to send out disaster prevention information to the transmission path. Do this.

On the other hand, if a signal collision on the transmission path is determined in step S5 when the transmission of the jam signal is finished in step S4,
Proceeding to step S7, it is determined whether or not the jam signal has been transmitted n times in step S4. This step S
The number of jam signal transmissions n in step 7 is determined according to a preset priority for information from the relay board, and the higher the priority, the larger the jam signal transmission number n.
In other words, the jam signal transmission time is set to be longer. Priority settings can be made, for example, for fire information, terminal equipment abnormality information,
By setting the information in the order of track failure information, etc., a higher priority is set for information that requires an emergency.

In step S7, since this is the first processing, if the number of jam signal transmissions 'n is 1 or more, the process returns to step S4 again to transmit the second jam signal, and the second jam signal is sent. The presence or absence of a signal collision is checked in step S5 during the transmission of the signal.If there is no signal collision, the process proceeds to step S6, where data transmission for transmitting disaster prevention information to the transmission path is performed.On the other hand, if there is a signal collision, the process returns to step S5.
The process advances to step 7 and repeats the process of checking whether the number of jam signal transmissions has reached n, which is set according to the priority.

When it is determined in step S7 that the number of jam signal transmission times In set according to the priority has been reached, step S8
Proceed to perform random number processing. The random number processing in step S8 is performed at the data processing level to obtain an arbitrary random value by rolling a die having a value of 1 to 6, for example. Any random value can be obtained. Next, the process advances to step S9 to create a waiting state for transmitting information to the transmission line for a predetermined time according to the random number value obtained by random number processing, and when the wait time in step S9 has elapsed, the process returns to step S4 again to transmit the jam signal. , the same process is repeated thereafter.

FIG. 4 is a timing chart when signals are sent to the transmission path from two relay boards No. 1 and No. 2 at the same time in the control process shown in FIG.
This shows a case where the information of relay board No. 2 has a higher priority than the information of .

In FIG. 4, at time t1, relay board No. 1. NO, 2
If transmission requests occur at the same time, the first jam signal is transmitted for a predetermined period of time To. Here, since the priority of the information on relay board No. 0゜1 is low and the priority of the information on No. 2 is high, the number of jam signal transmissions n of the relay board is set to n = 1, while The number of jam signal transmissions n of relay board No. 2 is n=2
is set to . Therefore, relay board NO. with low priority,
When the transmission of the first jam signal is completed in 1, the relay board No. 2 with a high priority continues to send the jam signal as before, and therefore the relay board No. 1 with a low priority stops transmitting the jam signal. Since there is a signal on the road, the vehicle enters a standby state for signal transmission. On the other hand, relay board N0, which has a high priority.
In case of No. 2, since there is no transmission information on the transmission path when the sending of the second jam signal is finished, data based on the own disaster prevention information is sent out to the transmission path.

That is, when requests to transmit information from a plurality of repeaters having different priorities occur simultaneously, data is sent from the repeater board having the information having the higher priority to the transmission path.

Figure 5 shows relay boards No. 1 and No. 1 that have the same priority information.
, 2 is a timing chart when transmission requests occur at the same time.

In this case, since the information priority of relay IN0.1 and NO,2 is the same, the number of jam signal transmissions n is, for example, n=
This is the same as No. 2, and a signal collision occurs when two jam signals are sent out. Therefore, in this case, when the transmission of the jam signal is finished, the relay board No., 'l, N
Random number processing is executed in each of relay board N0.1 and relay board N0.2.
Assume that a random number "6" is obtained. Relay board No. 1
, the jam signal is sent out after waiting for one cycle period according to the random number "1" obtained by random number processing, while the relay board No. 2 transmits the jam signal according to the random number "1" obtained by random number processing. The signal transmission is now stopped for 6 cycle times according to ``6'', and there is no collision on the transmission path when relay board No. 1 finishes sending out the jam signal after random number processing, so relay board No. 1 will first send data to the transmission path.

In this way, if transmission requests occur at the same time on multiple repeaters with the same priority, once the jam signal transmission according to the priority has been completed, the random number value obtained by performing random number processing will be applied. The jam signal and data are now sent after the idle time according to the priority, and even if the jam signal transmission time according to the priority is the same, the random numbers due to random number processing are different, so the jam signal and data are sent after the idle time based on the random number. The end point of the jam signal that has occurred is always shifted in time, and data is sent out to the transmission line with priority from the relay board that sent the jam signal again at the earliest point.

In the above embodiment, when transmission requests occur simultaneously on repeaters with the same priority, random number processing is performed after transmitting the jam signal the number of times according to the priority. Instead, a second priority with a different value is set for the relay board information with the same priority, and this second
By restarting the transmission of the jam signal after a different idle time according to the priority of , it is possible to perform transmission control similar to the case of random number processing.

In addition, although the above embodiment takes as an example the case where information is sent from multiple relay boards to a transmission path, receiver 1 can also be regarded as one of the relay boards, so that the same transmission can be performed in exactly the same way. By applying this method, it is possible to realize data transmission without signal collision on the transmission path.

[Advantageous Effects of the Invention 1] As explained above, according to the present invention, even if transmission requests occur simultaneously at a plurality of repeaters loop-connected to a receiver via a transmission line, signal collisions will occur on the transmission line. Disaster prevention information can be efficiently transmitted quickly and appropriately without any problems.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the system configuration of the present invention; Fig. 2 is a block diagram showing an embodiment of the relay panel of the present invention; Fig. 3 shows control processing according to the present invention. Flowchart: Figure 4 is a timing chart showing control processing when transmission requests occur simultaneously on two relay boards with different priorities; Figure 5 shows simultaneous transmission on two relay boards with the same priority. 5 is a timing chart showing control processing when a request occurs. 1: Receiver 2-1 to 2-5 = Relay board 3: Transmission line 4: Signal line 5: Relay 6; Terminal equipment 10: CPU 12: Transmission interface 14a, 14b: Changeover switch bypass line AND gate OR gate decoder Watchdog circuit failure detection circuit Figure 3

Claims (1)

[Claims] 1. A plurality of relay boards connected to a plurality of terminal devices are loop-connected to a receiver via a transmission path, and information is transmitted between the receiver and the plurality of relay boards via the transmission path. In the disaster prevention monitoring device, at least one of the relay boards includes monitoring means for monitoring the presence or absence of transmitted information from another relay board other than the own relay board on the transmission path; When the absence of transmission information from the other relay board is detected, it sends out a pseudo signal to occupy the transmission path for a predetermined period of time, and after sending out the pseudo signal, transmits its own information to the transmission path. a first transmission control means for transmitting; when the pseudo signal is transmitted and the monitoring means detects a pseudo signal from the other relay board on the transmission path, the first transmission control means transmits the pseudo signal according to the priority set for its own information; a second transmission control means that transmits the pseudo signal for a specified period of time, and if the priority of its own information is high, transmits its own information to the transmission path after transmitting the pseudo signal; When transmitting its own information by the transmission control means, if the priority of the own information and the transmission information of the other relay board is the same, the transmission of the information to the transmission path is stopped for a predetermined time according to random number processing. A third control means for restarting the transmission of the pseudo signal and information by the first transmission control means after the transmission control means has stopped.
A disaster prevention monitoring device comprising: a transmission control means; and; 2. The disaster prevention monitoring device according to claim 1, wherein the sending time of the pseudo signal by the second transmission control means is set to be longer as the priority becomes higher. 3. The disaster prevention monitoring according to claim 1, wherein the third transmission control means stops sending information to the transmission path for a predetermined time according to the second priority instead of the random number processing. Device.