JPH1049450A - Recovery method when an error occurs in the remote monitoring system - Google Patents

Abstract

(57) [Summary] [Problem] To monitor whether a remote monitoring side is normal or abnormal at a monitoring center. According to the present invention, a line interface control unit detects an abnormality in a main unit control unit while monitoring an operation state of a partner while transmitting and receiving polling signals between the main unit control unit and the line interface control unit. When detected, the abnormality is notified to the center monitoring station and the remote monitoring station is reset. Further, even when the main body control section operates normally by the reset, the center monitoring station is notified of the normality, so that the state of the remote monitoring station can be grasped by the center monitoring station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a line interface control unit which, when detecting an abnormality in a main unit control unit, notifies a center monitoring station of an abnormality in a remote monitoring station, and the line interface control unit transmits a signal to the main unit. The present invention relates to an error recovery method for a remote monitoring system in which an error in a remote monitoring station is recovered by resetting a control unit.

[0002]

2. Description of the Related Art Conventionally, a system for initializing a device in a supervisory control network or the like operated under software control using a CPU is disclosed in Japanese Patent Application Laid-Open No. 5-265596 when an abnormality occurs in the device. By automatically detecting the location where the abnormality has occurred and resetting only that location, it is possible to automatically recover from the failure, and to prevent data loss at locations other than the failure location. That is, CP
U determines the presence / absence of a failure in various functional blocks, and when a failed functional block is detected, sets a reset command signal in a reset register corresponding to the failed block. The reset circuit performs a hardware reset of the corresponding functional block in response to the reset command signal. This makes it possible to reliably reset each functional block individually.

[0003]

However, in such a fault recovery system, the presence or absence of a fault in various functional blocks is determined, and when a faulty functional block is detected, recovery is automatically performed based on a reset command signal. But
The state where the failure has occurred and the state where the failure has been recovered have not been notified to the center monitoring station. Therefore,
Since the center monitoring station could not quickly grasp the failure of the remote monitoring station installed at a remote place and information on the recovery from the failure, the response to the remote monitoring station was sometimes delayed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and a line interface control unit and a line interface control unit are provided in a remote monitor station installed at a place remote from a center monitor station. And a polling monitoring unit provided in the line interface control unit and monitoring polling from the main body control unit, wherein the polling monitoring unit is configured to control the main body control unit. When the line interface control unit detects an abnormality, the line interface control unit notifies the center monitoring station of the abnormality, and when the line interface control unit detects an abnormality of the main unit control unit, the main unit control unit is reset. When the whole body is automatically restarted and the normality of the main body control unit is confirmed, Providing recovery method when the remote monitoring system abnormality and a normal notification means for notifying the normal to the centers monitoring station.

[0005]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the remote monitoring system of the present invention, and FIG. 2 is a flowchart for explaining the operation of the remote monitoring system of the present invention. In FIG. 1, reference numeral 3 denotes a remote monitoring station installed at a distance, 1 denotes a center monitoring station that monitors the status of the remote monitoring station, and 2 denotes a remote monitoring station.
The remote monitoring system comprises a remote monitoring station 3 and an ISDN network in which high-speed voice and image data transfer processing is performed between the center monitoring station 1 and the remote monitoring station 3. In the remote monitoring station 3, 5 is a main body control unit for performing main monitoring processing, 4 is a line interface control unit for performing data communication control with the center monitoring station 1, and 8 is a main body control unit 5. A first reset circuit for resetting, 9 is a first reset REG in which a reset signal from the first reset circuit 8 is set, and 10 is a second reset for resetting the line interface control unit 4 Circuit and
Reference numeral 11 denotes a second reset REG in which a reset signal from the second reset circuit 10 is set. Reference numeral 6 denotes a first provided in the line interface controller 4 for transmitting and receiving a polling signal to and from the main body controller 5.
The polling monitoring section 7 is provided with a second polling monitoring section provided in the main body control section 5 for transmitting and receiving a polling signal to and from the line interface control section 4. The operation of the remote monitoring system according to the present invention will be described with reference to FIGS. As shown in FIG. 1, between the first polling monitoring unit 6 and the second polling monitoring unit 7, both operating states are monitored while transmitting and receiving polling signals to and from each other. Here, the operation of this polling will be described with reference to FIGS. 2 (a) to 2 (c). In FIG. 2A, when a reset switch or a power switch (not shown) is turned on from the main body control unit 5 (S0), all hardware including the first polling monitoring unit 6 is initialized (S0).
1). Then, a power-on sequence process is performed between the first polling monitoring unit 6 and the second polling monitoring unit 7 (S2), and a polling monitoring timer is started (S3). In FIG. 2B, when a polling signal is received from the second polling monitoring unit 7 of the main body control unit 5 (S4), the polling monitoring timer is restarted (S5). Here, as shown in FIG. 2C, a timer interrupt process is performed at regular intervals, and a timer count process is performed (S6). The timer count is determined, and it is determined whether polling has been sent from the second polling monitoring unit 7 of the main body control unit 5 within a fixed time (S7). If not, it is assumed that some abnormality has occurred in the main body control unit 5. Then, the center monitoring station 1 is notified that an abnormality has occurred in the main body control unit 5. Further, the remote monitoring station 3 sets a reset signal to the second reset REG 11, and sends a reset signal to the first reset REG 9 via the first reset circuit 8 of the main body control unit 5 through the second reset circuit 10. Is set, the main body controller 5 is reset (S9). In this way, the main body control unit 5 is automatically reset, and when any abnormality is resolved, the remote monitoring station 3 is notified that the main body control unit 5 is operating normally.

[0006]

As described above, according to the present invention, when monitoring the operating state of the other party while transmitting and receiving polling signals between the main body control unit and the line interface control unit, the line interface control unit When an abnormality is detected in the main body control unit, the abnormality is notified to the center monitoring station and the remote monitoring station is reset. Further, even when the main body control section operates normally by the reset, the center monitoring station is notified of the normality, so that the state of the remote monitoring station can be grasped by the center monitoring station.

[Brief description of the drawings]

FIG. 1 is a block diagram of a remote monitoring system according to the present invention.

FIGS. 2A and 2B are flowcharts for explaining the operation of the remote monitoring system of the present invention, in which FIG. 2A is an initialization process of a first polling monitoring unit, and FIG. 2B is a second polling monitoring by a first polling monitoring unit; Polling reception processing from the department,
(C) is a timer interrupt process in the first polling monitoring unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center monitoring station 2 ISDN network 3 Remote monitoring station 4 Line interface control unit 5 Main unit control unit 6 First polling monitoring unit 7 Second polling monitoring unit 8 First reset circuit 9 First reset REG

Claims (1)

[Claims] 1. A line interface controller, a main body controller for controlling the line interface controller, and a main unit controller provided in the line interface controller, the remote monitor station being set apart from the center monitor station. In a remote monitoring system having a polling monitoring unit that monitors polling from a main control unit, when the polling monitoring unit detects an abnormality in the main control unit, the line interface control unit notifies the center monitoring station of the abnormality. An abnormality notification unit that performs resetting of the main body control unit when the line interface control unit detects an abnormality of the main body control unit, automatic restart of the entire system, and confirmation of normality of the main body control unit. A normal notification means for notifying the monitoring station of the normality. Abnormal at the time of the recovery method of remote monitoring system for.