JPS63201755A - Fault deciding system for on-line terminal - Google Patents

Abstract

PURPOSE:To execute remote monitoring for an abnormality of a terminal by providing a time counting means for sending out a control signal to the terminal from a monitor station, and simultaneously, starting the time counting, and a deciding means for deciding the terminal to be a fault, in case an answer signal is not sent back within a prescribed time from the terminal to which the control signal has been sent out. CONSTITUTION:The titled system is constituted by providing a time counting means for sending out a control signal to a terminal 1 from a monitor station 4, and simultaneously, starting the time counting, and a deciding means for deciding the terminal 1 to be a fault, in case an answer signal is not sent back within a prescribed time from the terminal 1 to which the control signal has been sent out. At the time of sending out the control signal to the terminal 1 from the monitor station 4, the time counting means sends out the control signal, and simultaneously, starts the time counting, and outputs an elapsed time to the deciding means. The deciding means decides the terminal 1 to be a fault, in case an answer signal is not sent back from the terminal 1 to which the control signal has been sent out, within a prescribed time. In such a way, an abnormality of the terminal can be brought to remote monitoring without receiving an abnormality signal from the terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a remote monitoring and control system that monitors road conditions from a distance, and particularly relates to a failure determination method for an online terminal.

(Prior Art) Conventionally, this type of remote monitoring and control system has a configuration in which a plurality of terminals are connected online to a monitoring station, and road information sent from the monitoring station is displayed on each terminal. In such a system, when a terminal malfunctions, a monitoring station receives a terminal abnormality signal online from a terminal control panel, outputs it to a display, a printer, an alarm device, etc., and notifies the operator. However, according to this conventional method, there are cases where a failure signal is not sent to the monitoring station due to a failure or some abnormality in the terminal itself or the terminal control panel, making it impossible to remotely monitor abnormalities (failures) in the terminal from the monitoring station. This inconvenience arises.

(Problem to be solved by the invention) In the conventional remote monitoring and control system, the monitoring station monitors abnormalities in the terminal by receiving an abnormal signal from the terminal, so the abnormal signal does not reach the monitoring station for some reason. In this case, there was a drawback that it was not possible to remotely monitor terminal abnormalities. SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks and provides an online terminal failure determination method that allows remote monitoring of abnormalities in a terminal without receiving an abnormality signal from the terminal.

[Means of the Invention (Means for Solving Problems)] The present invention provides a method for determining failure of an online terminal in a remote monitoring and control system in which a plurality of terminals are connected to one monitoring station. The device includes a timer that starts timing at the same time as sending a control signal to the terminal, and a determining device that determines that the terminal is malfunctioning if a response signal is not returned within a predetermined time from the terminal that sent the control signal. It consists of

(Function) In the online terminal failure determination system of the present invention, when a control signal is sent from the monitoring station to the terminal, the timer starts timing at the same time as the control signal is sent, and outputs the elapsed time to the determiner. . The determining means determines that the terminal is out of order when a response signal is not returned from the terminal that sent the control signal within a predetermined time.

(Example) An example of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of a remote monitoring system to which the online terminal failure determination method of the present invention is applied. Reference numeral 1 denotes a terminal (assuming a roll-up type information panel) that displays road information and the like, and has a display board 11. 2 is a terminal control panel that relays signal input and output to the terminal 1 and inputs various operations to this terminal when offline; 3 is a remote monitoring control transmission device that transmits signals between the terminal control panel 2 and the monitoring station 4; 4 is a This is a monitoring station that sends road information to terminals and monitors terminal failures, etc., and is equipped with a central processing unit 41, a graphic panel 42, a control console 43, etc.

Next, the operation of this embodiment will be explained. First, to display road information on the display board 11 of the terminal 1, select and input appropriate display characters from the control console 43 of the monitoring station 4.
The central processing unit 41 converts the input display characters into a corresponding display signal and then provides this to the remote monitoring control transmission device 3. The remote monitoring control transmission device 3 transmits the manually input display signal to the terminal control panel 2 via a transmission path. The terminal control panel 2 relays the input display signal and inputs it to the terminal 1.
drives the roll of the display board 11 based on the input display signal to display the specified content. At this time, the terminal 1 sends a change raw signal indicating that the display board is being changed to the central processing unit 41 of the monitoring station 4 via the terminal control panel 2 and the remote monitoring control transmission device 3, and then After displaying the displayed contents on the display board 11, a completion signal indicating the displayed contents is sent back to the central processing unit 41 via the terminal control panel 2 and the remote monitoring control transmission device 3. Thereby, the central processing unit 41 knows that the desired display has been normally performed on the terminal 1.

By the way, when the central processing unit 41 sends the display signal to the display board, it sets a timer as shown in the flowchart of FIG. , determines that the corresponding terminal is malfunctioning. That is, at step 201 in FIG. 2, the central processing unit 41 sends a display signal to the terminal 1 and at the same time starts the timer. Thereafter, the central processing unit 41 determines in step 202 whether or not a completion signal has been received from the terminal 1 within a predetermined time period corresponding to the terminal 1, and if not received, the central processing unit 41 determines in step 203 that the terminal 1 has failed. The determination is made, a failure is displayed on the graphic panel 42, and the process is terminated. However, if the completion signal is received within the predetermined time in step 202, the terminal 1 determines that the terminal 1 is normal and performs other processing in step 201'l.
Return to 1. Here, in FIG. 1, only one terminal 1 is connected to the monitoring station 4.
Although this example shows an example in which multiple terminals are connected, step 20 is actually performed depending on each terminal.
The two predetermined times are different as shown in the table below, and the central processing unit 41 performs the process of step 202 by referring to the memory etc. that stores the relationships shown in the table below.

Furthermore, if the terminal 1 normally fails, the terminal 1 transmits an abnormal signal to the monitoring station 4 via the terminal control B2 and the remote monitoring control transmission device 3, so the central processing unit 41 does not perform the processing shown in FIG. In either case, it is possible to immediately know the failure of the terminal 1 and display the failure on the graphic panel 42 or the like. However, when the terminal 1 tries to display a specified display on the roll-up type display board 11 and the roll of this display board stops spinning, the central processing unit 41 sends a signal indicating that the display is being changed. However, no abnormal signal is sent from terminal 1.

However, in such a case, the central processing unit 41 can know the abnormality of the terminal 1 through the abnormality monitoring process shown in FIG. 2 above.

According to this embodiment, even if an abnormal signal is not sent from the terminal 1 to the monitoring station 4 for some reason, the central processing unit 41 of the monitoring station 4 outputs a control signal to the terminal 1 until the completion signal is returned. By monitoring the time, it is possible to remotely monitor the abnormality of the terminal 1 without depending on the abnormality signal. Therefore, any abnormality in the terminal can be quickly detected in any case, and the reliability of the system can be improved.

[Effects of the Invention] As described above, according to the online terminal failure determination method of the present invention, it is possible to remotely monitor abnormalities in a terminal without receiving an abnormality signal from the terminal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a remote monitoring and control system to which the online terminal failure determination method of the present invention is applied, and FIG. 2 shows the terminal abnormality monitoring operation of the central processing unit shown in FIG. 3 is an operational flowchart shown in FIG. 1...Terminal 2...Terminal control panel 3
... Distant monitoring control transmission device 4 ... Monitoring station 41 ... Central processing unit 42 ... Graphic panel 43 ... Control operation console agent Patent attorney Nori Chika Ken Shu Kanshu Sanno −

Claims (1)

[Claims] In a failure determination method for an online terminal of a remote monitoring and control system in which a plurality of terminals are connected to one monitoring station, a timekeeping means that starts timing at the same time as a control signal is sent from the monitoring station to the terminal, and the control signal 1. A failure determination method for an online terminal, comprising determining means for determining a failure of the terminal if a response signal is not returned within a predetermined time from the terminal that sent the message.