JPH09186684A - Transmission abnormality detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain automonous check by other equipment by sending signals denoting respectively operation start, operating state and transmission end, allowing a check device to confirm whether or not the signal denoting the operating state from a checked device within a prescribed period and discriminating it that a transmission system is faulty when the signal is not received. SOLUTION: A network 1 is provided with a checked device 2 and a check device 3 checking the operating state and an equipment operation start signal 101, an equipment operating state signal 102 and an equipment operation end signal 103 are sent to the network 1. The checked device 2 is provided with a data transmission process 201 and sends the equipment operation start signal 101, the equipment operating state signal 102 and the equipment operation end signal 103. On the other hand, the check device 3 is provided with a check start process 301 and a check process 401 and receives the equipment operation start signal 101, the equipment operating state signal 102 and the equipment operation end signal 103 from the checked device 2 via the network 1 to check the information transmission state with the checked device 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for checking whether information transmission of each device connected to a network is normal and checking whether other devices are transmitting information normally to each other. Involved in a transmission error detection device that detects an error.

[0002]

2. Description of the Related Art In a system for controlling by a network, in a system in which each device connects to the network to transmit / receive data and determine its own state based on the states of other devices, , It is very important to periodically check the status of other devices.

In a mobile management system such as a railroad or a bus, each mobile transfers data to a network so that the ground-side management device controls the behavior of each mobile or each mobile transfers other data. The behavior is controlled autonomously based on the state of the moving body. In these systems,
Unless the position and speed of each moving body is always recognized to determine the behavior of the moving body, the operation of the moving body is disturbed and, in the worst case, an accident may occur. In such a system, some mobile units are in operation, such as during commercial operation or forwarding, and some are in a garage, but some are inactive.Therefore, when the transmission is interrupted, the cause is the mobile unit. It is necessary to judge whether it is due to suspension or due to abnormality or failure of the transmission system with the mobile body.

As a method of judging transmission abnormality / fault of this kind, in Japanese Patent Laid-Open No. 6-244852, a device to be checked and a management device for managing it are provided, and the device to be checked sends a test signal to the management device. If there is no response from the management device when doing so, a method has been proposed in which it is considered that there is an abnormality in transmission and a failure notification is sent to the management device.

[0005]

In the above-mentioned conventional technique, if there is an abnormality in the receiving unit of the checked device, it can be transmitted to the management device that there is an abnormality. In some cases, it is impossible to send a test signal or fault notification to the management device.

[0006] One object of the present invention is to provide a transmission abnormality detecting apparatus capable of autonomously checking whether another apparatus connected to a network normally transmits information.

Another object of the present invention is to provide a transmission abnormality detecting device capable of determining, when information transmission of an arbitrary device connected to a network is interrupted, whether it is due to operation termination of the device or abnormal transmission. To provide.

Still another object of the present invention is to provide a transmission abnormality detecting device which allows a management device to check whether any device connected to a network is transmitting information normally.

[0009]

Among the devices connected to the network, a signal indicating the start of operation of the device is transmitted to the device to be checked when the information transmission to the network is started and the device is in operation. A means for transmitting a signal indicating that the device is operating within a fixed period and transmitting a signal indicating the end of transmission when the device operation ends is provided. Further, regarding the checking device, a means is provided for checking the device operating signal from the checked device within a fixed period when receiving the device operating start signal from the checked device, and ending the check when receiving the transmission end signal. I decided.

Device operation start / operation of checked device /
The operation end signal transmission unit transmits an operation start signal to the network when the device itself starts operation, and transmits an operation end signal to the network when the operation ends. While the device is operating, it sends an operating signal to the network within a fixed period.

When the check device receives the operation start signal from the checked device, it starts monitoring the checked device,
It waits for the in-operation signal to be received from the checked device. When the operating signal from the checked device is received within a fixed period, it is determined that there is no abnormality in the transmission with the checked device. On the other hand, when the operation end signal is not received from the device to be checked and the signal in operation is not received within the fixed period, the checking device determines that the transmission with the device to be checked is abnormal.

In this way, another device can autonomously check whether or not the device connected to the network is normally transmitting information.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

First, the basic device configuration and system of the system of the present invention will be described with reference to FIG. Reference numeral 1 is a network, 2 is a checked device for checking whether information is transmitted correctly, and 3 is a checking device for checking the operating state of the checked device. Reference numeral 101 is an apparatus operation start signal, 102 is an apparatus operation signal, and 103 is an apparatus operation end signal, and these are transmitted through the network 1.
The checked device 2 has a data transmission process 201,
A device operation start signal 101, a device operation signal 102, and a device operation end signal 103 are transmitted. On the other hand, the check device 3 has a check activation process 301 and a check process 401, and outputs a device operation start signal 101, a device operation signal 102, and a device operation end signal 103 transmitted from the device to be checked 2 via the network 1. Receive
The information transmission state with the checked device 2 is checked.

Next, the operation of the data transmission process 201 of the checked device 2 will be described with reference to FIG. The data transmission process 201 is in the idle state 211,
The operation start state 212, the operation start signal transmission state 213, the operation signal transmission state 214, the operation end determination state 215, the operation end signal transmission state 216, and the operation end state 217. When the checked device starts to operate, the idle state 211 changes to the operation start state 212, and the operation start signal 101 is transmitted to the network 1. After the operation is started, the operation signal 102 is sent to the network 1 within a certain period.
Send to. At the end of operation, the operation end signal 103 is transmitted to the network 1 to end the operation and return to the idle state 211.

Next, the operation of the check activation management process 301 of the check device 3 will be described with reference to FIG.
The states of the check activation management process 301 include a process start state 311, a waiting state 312 for receiving an operation start signal from the checked device, and a check process activation state 3.
13 When the check activation management process 301 is started, the operation start signal 101 from the checked device 2 is started.
Keep waiting for. Then, when the operation start signal 101 is received, the check process 401 is activated.

Next, the operation of the check process 401 of the check device 3 will be described with reference to FIG. The state of the check process 401 is composed of a waiting state 412 for receiving an operation end signal from the checked device 2, a waiting state 413 for receiving the operating signal 102, a checked device transmission abnormality detection 414, and a check process end 415. The check process 401 is the check activation management process 30.
It is activated by 1 and enters a transmission waiting state of the operating signal 102 transmitted from the checked device 2.

When the operating signal 102 is received within a fixed period, the checked device 2 determines that it is operating. When receiving the operation end signal 103, the checked device 2 determines that the operation has ended. However, when neither the in-operation signal 102 nor the operation end signal 103 is received within a fixed period, it is determined that an abnormality in the transmission from the checked device 2 has occurred.

Next, the basic device construction and system of another system of the present invention will be described with reference to FIG. Reference numeral 1 is a network, 2 is a checked device for checking whether information is transmitted correctly, and 4 is an operating state management device for checking the operating state of the checked device. Reference numeral 101 is an apparatus operation start signal, 102 is an apparatus operation signal, and 103 is an apparatus operation end signal, and these are transmitted through the network 1.

The checked device 2 has a data transmission / reception process 501, and sends a device operation start signal 101, a device operation in-progress signal 102, and a device operation end signal 103.
On the other hand, the operating status management device 4 has a status management process 601 and an operating status monitoring process 701, and receives the device operation start signal 101 and the device operation end signal 103 transmitted from the checked device 2 via the network 1. Works. Further, the operating status management device 4 transmits an operating status check signal 104, and determines whether or not there is a transmission error with the checked device depending on whether the device operating signal 102 from the checked device is received.

Next, the operation of the data transmission / reception process 501 of the checked device 2 will be described with reference to FIG. The data transmission / reception process 501 is in the idle state 51.
1, operation start state 512, operation start signal transmission state 51
3, an operation end determination state 514, an operation state check signal reception determination state 515, an operation signal transmission state 516, an operation end signal transmission state 517, and an operation end state 518.

When the checked device starts to operate, the idle state 511 changes to the operation start state 512, and the operation start signal 101 is transmitted to the network 1. After the operation is started, when the operation state check signal 104 from the operation state management device 4 is received, the operation state check signal reception determination state 515 is passed to the in-operation signal transmission state 516,
Send a busy signal 102 to the network. At the end of operation, the operation end signal 103 is transmitted to the network 1 to end the operation and return to the idle state 511.

Next, the operation of the status management process 601 of the operating status management device 4 will be described with reference to FIG. The state of the state management process 601 is the process start state 61.
1. Waiting for operation start signal from the device to be checked 6
12 and the activation status 613 of the operating status monitoring process. When the state management process 601 is started, it waits for the operation start signal 101 from the checked device 2. When the operation start signal 101 is received, the operation state monitoring process 701 is activated.

Next, the operation of the operating state monitoring process 701 of the operating state management device 4 will be described with reference to FIG.
The states of the operating state monitoring process 701 are the process start state 711, the operating state check signal transmission state 712, the operation end signal reception determination state 713, the operating signal reception determination state 714, the process end state 715, and the checked device transmission error detection 716. Consists of. Operating status monitoring process 7
01 is activated by the state management process 601, and after activation, transmits an operating state check signal 104 to the checked device 2 within a fixed period until it receives the operation end signal 103 from the checked device. At this time, when the in-operation signal 102 is transmitted from the checked device, the checked device 2 is determined to be in operation. On the other hand, when the operating signal 102 is not transmitted, it is determined that the transmission state with the checked device is abnormal.

As described above, according to this embodiment, another device can autonomously check whether or not the device connected to the network is normally transmitting information.

[0026]

As described above, according to the method of the present invention, when each device connected to the network judges that the transmission with the device to be checked is interrupted,
It is possible to determine whether it is due to the end of the information transmission between the device and the network or the transmission error between the device and the network.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic device configuration and system that enables the system of the present invention.

FIG. 2 is a flowchart showing a basic operation of a data transmission process in the checked device.

FIG. 3 is a flowchart showing a basic operation of a check activation management process in the check device.

FIG. 4 is a flowchart showing the basic operation of the check process in the check device.

FIG. 5 is an explanatory diagram showing another device configuration and system enabling the system of the present invention.

FIG. 6 is a flowchart showing a basic operation of a data transmission / reception process in the checked device.

FIG. 7 is a flowchart showing a basic operation of a state management process in the operating state management device.

FIG. 8 is a flowchart showing a basic operation of an operating state monitoring process in the operating state management device.

[Explanation of symbols]

1 ... Network, 2 ... Device to be checked,
3 ... Check device, 4 ... Operating state management device, 101 ... Operating start signal, 102 ... Operating signal, 103 ... Operating end signal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiro Sasaki 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Inside the Hitachi, Ltd. Systems Development Laboratory (72) Inventor, Takashi Oka Hitachi Mito Factory

Claims (3)

[Claims] 1. In a network system comprising a network and a device connected to the network, the device to be checked sends a signal indicating the start of device operation at the time of starting information transmission to the network, and within a certain period during operation of the device. It is equipped with means for transmitting a signal indicating that the device is in operation, and transmitting a signal indicating the end of transmission at the end of device operation, and the check device was sent a signal indicating the device operation start from the checked device. After that, there is provided a means for confirming whether or not a signal indicating that the device under operation is received from the device under check is provided within a fixed period until the device under check transmits a signal indicating the end of transmission. Abnormal transmission, characterized by including means for judging that the transmission system with the device is abnormal when the signal from the device to be checked is not received within a certain period. Intelligence apparatus. 2. A network system comprising a network and a device connected to the network, wherein the device to be checked sends a signal indicating the start of device operation when starting information transmission to the network, and terminates the transmission when the device operation ends. And a means for transmitting a signal indicating that it is normal when the diagnostic signal from the checking device is received, and further, a signal indicating the start of device operation is transmitted from each of the other devices. After that, the operating state management device transmits a signal for confirming that the information transmission is normal to the checked device within a fixed period until the checked device transmits a signal indicating the end of transmission. The operating state management device determines that there is an abnormality in transmission when the operating state management device does not receive a signal from the checked device within a fixed period, Transmission error detecting device transmission system is characterized in that a means for transmitting to another device that is abnormal. 3. A network system comprising a network and a device connected to the network, wherein the device to be checked sends a signal indicating the start of device operation at the time of starting information transmission to the network, and within a certain period during operation of the device. A device for transmitting a signal indicating that the device is operating, and for transmitting a signal indicating the end of transmission at the end of device operation, and a signal indicating the start of device operation from other devices in the network. After that, an operating state management device is provided to check and manage whether a signal indicating that the device is operating is received from the device within a fixed period until the device value transmits a signal indicating the end of transmission. A transmission abnormality detection device characterized by determining that the transmission between the device and the network is abnormal when the management device does not receive a signal from the device within a fixed period. .