JPH02182051A - Communication abnormality detector - Google Patents

Abstract

PURPOSE:To find out a communication terminal equipment having a communication abnormality quickly and accurately automatically by providing a communication means, an individual transmission request means, an address storage means, a simultaneous multiple address transmission request means, an arithmetic control means and a communication abnormality detector having a communication fault address display means. CONSTITUTION:When a transmission request takes place in an individual transmission request means 9 of a communication abnormality detector 14, an arithmetic control means 12 sends individually the signal to a lighting line 1 according to a transmission request caused in the individual transmission request means 9. After the detection of a confirmation signal, the arithmetic control means 12 stores its own station address of a communication terminal equipment sending the confirming signal to an address storage means 10 and outputs the information to a simultaneous multiple address transmission request means 11 and an arithmetic control means 12. Upon the receipt of a notice signal of the communication terminal equipment, the communication abnormality detector 14 erases only its own station address of the communication terminal equipment among addresses to be stored. The own station address of the communication terminal equipment not returning the notice signal is being stored, the arithmetic control means 12 controls a communication fault abnormality display means 13 to display an abnormal state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication abnormality detection device for detecting communication abnormalities between a plurality of communication terminal devices connected to a transmission communication path.

Conventional technology In recent years, for the purpose of centrally controlling multiple communication terminal devices or monitoring the status of each communication terminal device, transmission technology has been introduced that connects each communication terminal device with a transmission channel and transmits signals to each other. Various control systems have been reported. These mainly employ the CSMA/CD method as a communication method, but in this method, the entire system does not operate properly unless signals are transmitted and received normally between all communication terminal devices. For example, there are three communication terminal devices A, B, and C, and A and B and B and C can send and receive signals normally to each other, but A and C receive the signal sent by A, and C also receives the signal sent by A. On the other hand, suppose that A cannot receive the signal transmitted by C. In this case, even if a signal transmission request occurs at the same time at A and C, and the information contained in the signal is necessary for B, collision detection (CD) is not performed at A(!:C), so B A and C signals are received in a mixed state, and not only does the information not arrive correctly, but in the worst case, incorrect information may be received. Even if a transmission request occurs after a delay, start transmission after confirming that the transmission channel is unused (
Since the C3MA communication system (C3MA communication system) is not performed normally, the A and C signals are mixed from the middle of the signal, causing the same problem as described above. Therefore, when constructing a system, it is necessary to check whether transmission and reception are being performed normally in all combinations of communication terminal equipment, and conventionally this work has been done manually.

Problem to be Solved by the Invention However, as the number of communication terminal devices increases, there is a limit to manual operation checking.For example, in a system where Yuri communication terminal devices exist, 1oooc2=4.
, 950 combinations, it is necessary to check the operation, so it is currently impossible to check all of them.

The present invention solves the above-mentioned problems, and aims to provide a communication abnormality detection device that automatically detects that among all combinations of communication terminal equipment, there is a combination in which transmission and reception are not performed normally. .

Means for Solving the Problems In order to solve the above-mentioned problems, the communication abnormality detection device of the present invention has its own address for each station, transmits a confirmation signal when receiving a signal addressed to its own station, and also transmits a simultaneous broadcast notification. A plurality of communication terminal devices that transmit a notification signal when receiving a request signal, a communication abnormality detection device that detects a communication abnormality between the plurality of communication terminal devices, and a communication abnormality detection device that detects a communication abnormality between the communication terminal devices and the communication abnormality detection device. It has a transmission communication path which is a transmission path,
The communication abnormality detection device includes a communication means for transmitting and receiving signals, an individual transmission request means for requesting individual transmission to addresses within a settable range, and a self-station address of the existing communication terminal device. address storage means for temporarily storing the address; and simultaneous broadcast transmission request means for requesting the plurality of communication terminal devices to transmit the simultaneous broadcast request signal after the transmission request from the individual transmission request means is no longer received; After receiving the output of the individual transmission request means and individually transmitting it to the communication terminal equipment by the communication means, if the confirmation signal is received, an instruction to store the own station address of the communication terminal equipment in the address storage means; At the same time, upon receiving the output of the simultaneous broadcast transmission requesting means, if the communication means receives a notification signal from a communication terminal device after transmitting the simultaneous broadcast notification request signal, the communication means stores the information in the address storage means. The communication terminal device is instructed to erase its own station address, and after receiving all notification signals, the own station address stored in the address storage means is set as the own station address of the communication terminal device with the communication error. and communication abnormality address display means for receiving the output of the calculation control means and displaying the local address of the communication terminal device having the communication abnormality.

According to the above-described configuration, the arithmetic control means controls the communication means to sequentially perform individual transmission based on the output of the individual transmission request means of the communication abnormality detection device, and as a result, an acknowledgment signal (ACK) is sent from the communication terminal device. When it is detected from the output of the communication means that the ACK has been transmitted, the arithmetic control means instructs the address storage means to store the own station address of the communication terminal device that sent the confirmation signal (ACK), and After the individual transmission is completed to all the addresses, the arithmetic control means controls the communication means by the output of the simultaneous broadcast transmission requesting means to issue a simultaneous broadcast request signal, and as a result 1, the communication terminal equipment transmits. When the notification signal is detected by the output of the communication means, the arithmetic control means instructs the storage means to erase the own station address of the communication terminal device that sent the notification signal, so that the communication terminal devices do not have to send data to each other. If there is a device that cannot receive a signal, the address of those communication terminal devices remains stored in the address storage means, and the arithmetic control means outputs it to the communication error address display means, making it very easy to do so. This allows communication abnormalities to be discovered.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a communication abnormality detection device in one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a transmission communication path which is a signal transmission path, and in this embodiment, it is composed of a power line. 2
, 3.4 is a communication terminal device that transmits an acknowledgment signal (ACK) when receiving a signal addressed to its own station, and also transmits a broadcast signal when receiving a broadcast broadcast request signal using C8MA/CD communication. In this system, three devices are connected. Reference numerals 5, 6.7 indicate own-station address setting switches for setting the own-station addresses, which are the identification numbers of the communication terminal equipment 2, 3.4, respectively. This own station address is set to a different value for each communication terminal device, and when a communication terminal device sends a signal, by including the value of this own station address in the signal, it is possible to determine which communication terminal device It becomes possible to identify whether the signal was sent by

8 is a communication means for transmitting and receiving signals on the power line 1; 9 is an individual transmission request means for requesting individual transmission in sequence to addresses within a range that can be set in this system; and 10 is a communication means for transmitting and receiving signals on the power line 1; Address storage means 11 temporarily stores all of the own station addresses, and 11 transmits a broadcast broadcast request signal to prompt communication terminal devices to transmit broadcast signals all at once after the transmission request from the individual transmission request means 9 is no longer received. This is a means for requesting simultaneous broadcast transmission. 12 receives the output of the individual transmission requesting means 9, and after individually transmitting to the communication terminal equipment by the communication means 8, if an acknowledgment signal (ACK) is received, the address storage means 1o stores the information of the communication terminal equipment. When a notification signal from a communication terminal device is received after instructing to store the station address and receiving the output of the simultaneous broadcast transmission requesting means 11 and transmitting a simultaneous broadcast request signal by the communication means 8, Address storage means 10
The communication terminal device is instructed to erase its own station address from the communication terminal device, and after receiving all the notification signals, the own station address stored in the address storage means 10 is erased from the memory of the communication terminal device in which the communication abnormality has occurred. It is an arithmetic control means that outputs the value as a certain value. Reference numeral 13 designates a communication abnormality address display means for receiving the output of the arithmetic control means 12 and displaying the local address of the communication terminal device in which the communication abnormality has occurred, and 14 represents a communication abnormality detection device comprising the respective means 8 to 13 described above.

The operation of the communication abnormality detection system configured as above will be described below.

First, it is assumed that a transmission request is issued to the individual transmission request means 9 of the communication abnormality detection device 14. Then, the arithmetic control means 12 receiving this output individually transmits this signal onto the power line 1 through the communication means 8 in accordance with the transmission request generated by the individual transmission request means 9. Currently, in this system, the number range of the own address that a communication terminal device can take is 1 to 16, and the own address setting switch 5, 6.7 of the communication terminal device 2゜3.4
Assume that the setting values of are No. 1, No. 2, and No. 3, respectively.

In this case, the individual transmission request means 9 will issue an individual transmission request to the communication terminal devices numbered 1 to 15. Further, the arithmetic control means 12 which received this output uses the communication means 8 to individually transmit data to the communication terminal devices having address numbers 1 to 16 via the transmission communication path 1. As a result, confirmation signals (
ACK) is returned. The calculation control means 12 is the communication means 8
After detecting the confirmation signal (ACK), the address storage means 1o stores the own addresses No. 1, No. 2, and No. 3 of the communication terminal equipment 2, 3.4 that sent the confirmation signal (ACK). . When the individual transmission requesting means 9 no longer has a transmission request, the individual transmission requesting means 9 outputs the information to the broadcast transmission requesting means 11 and the calculation control means 12. As a result, a request is made to the simultaneous broadcast requesting means 11 to send a simultaneous broadcast request signal urging all the communication terminal devices to simultaneously transmit the broadcast signal. Upon receiving this, the arithmetic control means 12 sends out a broadcast request signal onto the transmission communication channel 1 through the communication means 8. The communication terminal devices 2, 3.4 that received this signal via the transmission communication path 1 stop transmitting the notification signal according to the command.
Start all at once using SMA/CD method communication. The operation in this case will be explained below in two cases: a case in which each communication terminal device can normally receive signals transmitted by each other, and a case in which communication terminal devices 2 and 4 cannot receive signals transmitted by each other.

First, if each communication terminal can normally receive the signals transmitted by each other, even if they start transmitting broadcast signals all at once, C8M
The A/CD operates normally, and all the notification signals transmitted by the communication terminal devices 2, 3, and 4 normally reach the communication abnormality detection device 14. These notification signals are sent to the communication means 8.
The arithmetic control means 12 receives the own station addresses No. 1 and No. 2 of the communication terminal devices 2 and 3.4 in the address storage means 1o.
As a result, the own station addresses No. 1, No. 2, and No. 3 stored in the address storage means 1o are cleared. The arithmetic control means 12 displays the status information on the communication abnormality address display means 13. In other words, in this case, the communication abnormality address display means 13 will either display that there is no communication terminal device in which a communication abnormality has occurred, or will not display anything.

Next, a case will be described in which a communication abnormality occurs and the communication terminal devices 2 and 4 are unable to receive signals transmitted by each other.

In this case, if the three communication terminal devices 2.degree. 3.4 start transmitting notification signals at the same time, only the notification signal of the communication terminal device 3 will be normally sent onto the transmission channel 1. The reason for this will be explained in more detail using FIG. In FIG. 2, reference numeral 16 indicates an AC voltage waveform on the power line 1. In FIG.

Figure 2a shows the bit strings of data "1" and data "Os," where data "1" is a configuration in which a high-frequency signal is superimposed in the first half of the peak value of the AC voltage waveform 16, and data "0" is superimposed in the second half of the peak value. is expressed by

The transmission signal of the communication terminal equipment is based on this data ""11. The data "ol" has a configuration in which multiple bits are concatenated.
The figure shows data ""0" and data "1" according to the same definition.
shows the bit string of If the communication terminal device 2 sends out the data shown in Figure 2 and the communication terminal device 4 sends out the data shown in Figure 2 at the same time, the collision detection will not work because they cannot receive each other's transmission signals. There is a 2nd line on the 1st light line.
A collision signal as shown in Figure C will be sent. Other devices that receive this signal will not be able to determine whether the received data is ``1'' or ``0''. Therefore, in this case, as described above, the communication abnormality detection device 14 will broadcast a simultaneous broadcast. Even if the request signal is transmitted and the communication terminal devices 2, 3.4 start transmitting notification signals all at once according to the command, only the notification signal of the communication terminal device 3 is successfully sent onto the power line 1. Therefore, the communication abnormality detection device 14 that has received the notification signal of the communication terminal device 3 selects the communication terminal device 3 from among the addresses No. 1, No. 2, and No. 3 stored in the address storage means by the arithmetic control means 12. instructs the user to delete only number 2, which is his own address.

As a result, the addresses No. 1 and No. 3 are continuously stored in the address storage means 1o, and the arithmetic control means 12 controls the communication abnormality address display means 13 to display the values as abnormal.

The communication error address display means 13 displays that there is a communication error in the communication terminal devices 2 and 4. In this way, the address of the communication terminal device in which the communication abnormality has occurred can be immediately detected.

As described above, according to this embodiment, it is possible to immediately determine whether or not there is a communication abnormality between communication terminal devices, and when there is a communication abnormality, it is possible to determine which communication terminal device has the communication abnormality. This can be instantly recognized by the display contents of the address display means 13.

In this embodiment, the number of communication terminal devices is three, but the effect of the present invention becomes more pronounced as the number increases. Further, although the power line is used as the transmission communication path, the gist of the present invention is not affected even if other transmission communication paths, such as a coaxial cable or a dedicated communication line, are used.

Effects of the Invention As described above, the present invention provides communication means 7 individual transmission request means,
By providing a communication abnormality detection device having an address storage means, a simultaneous broadcast transmission request means, an arithmetic control means, and a communication abnormality address display means, it is possible to quickly and accurately automatically detect communication terminal equipment in which a communication abnormality has occurred. It is possible to discover it, and its effects are great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a communication abnormality detection device in one embodiment of the present invention, and FIGS. 2 a to 2 c are waveform diagrams showing communication signals in one embodiment of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Transmission channel, 2-4...Communication terminal equipment, 8...Communication means, 9...Individual transmission request means, 10 Address storage means , 11...
- Simultaneous broadcast transmission request means, 12... Arithmetic control means, 13... Communication abnormality address display means, 14
・・・・・・Communication abnormality detection equipment. Name of agent: Patent attorney Shigetaka Awano and 1 other person 2nd
figure

Claims (1)

[Claims] A plurality of communication terminal devices each having its own address and transmitting a confirmation signal when receiving a signal addressed to its own station and transmitting a notification signal when receiving a broadcast request signal, and these plural communication terminal devices. a communication abnormality detection device that detects a communication abnormality between the communication terminal device and the communication abnormality detection device; and a transmission communication path that is a transmission path for signals transmitted and received by the communication terminal device and the communication abnormality detection device; an individual transmission requesting means for requesting that individual transmission be performed sequentially to addresses within a settable range; an address storage means for temporarily storing the own address of the existing communication terminal equipment; After the individual transmission requesting means no longer has a transmission request, a simultaneous broadcasting requesting means requests the plurality of communication terminal devices to transmit the simultaneous broadcasting request signal, and receiving the output of the individual transmission requesting means, If the confirmation signal is received after the communication means transmits the confirmation signal individually to the communication terminal equipment, the address storage means is instructed to store the own station address of the communication terminal equipment, and the simultaneous broadcast transmission request means In response to the output of the communication means,
If a broadcast signal from a communication terminal device is received after transmitting the broadcast request signal, the address storage means is instructed to erase the memory of the own station address of the communication terminal device, and all broadcast signals are After receiving the data, arithmetic control means sets the own address stored in the address storage means as the own address of the communication terminal device having the communication error and outputs the value; A communication abnormality detection device comprising communication abnormality address display means for displaying a local address of a terminal device.