JPH04169996A - Remote monitoring system - Google Patents

Abstract

PURPOSE:To transmit an abnormal state from each slave machine to a center device by setting up delay time required for transmitting the abnormal state from each remote monitoring device to be a slave machine to the center device to each different time so that plural slave machines do not collide with each other through a telephone line. CONSTITUTION:When a status return request from a remote monitoring device 30a to be a master machine is not transmitted to remote monitoring devices 30b, 30c to be slave machines within a determined time by any abnormality, respective devices 30b, 30c to be the slave machines inform respective abnormal states to the center device 6 after the lapse of respectively different determined delay times, e.g. the maximum communication time of each transmission is 5min, the 2nd remote monitoring device 30b has a 5min delay and the 3rd remote monitoring device 30c has a 10min delay. Thus, when the remote monitoring device 30a to be the master machine is not driven by any abnormality, the abnormality can be informed from the remote monitoring devices to be the slave machines to the center device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote monitoring system comprising a plurality of remote monitoring devices that remotely monitor, for example, an elevator through a telephone line.

[Conventional technology]

Examples of remote monitoring systems in which a plurality of remote monitoring devices are connected to the same line are disclosed in Japanese Patent Application Laid-open Nos. 60-190047 and 1-113798.

According to these technologies, the parent device can collectively report the status of the monitoring devices of the slave devices to the center. However, the reporting function was only available on the base unit, not on the slave unit, and could not report to the center.

On the other hand, there is a general example of a remote monitoring system in which all remote monitoring devices connected to the same telephone line can report to a center as shown in FIG. In Figure 4, there are elevators (2a) and (2b) in building (1).
, (2c) and a remote monitoring device (3a), respectively.
(3b) and (3c) are provided, and the same telephone line (
4) and a central device (6) via a telephone network (5), so that monitoring and maintenance of each elevator can be performed remotely.

The above remote monitoring device (3a), (3b), (
3c) has the same configuration, for example, the remote monitoring device (3a)
is a line closing relay contact S that is closed when dialing or communicating and connects the line to the modem (31) side, and breaks when waiting for an incoming call to connect the line to the incoming call detection circuit (32) side; A modem (31) that is DC-insulated via a transformer T and communicates data with the line and transmits data to the CPU (33) is insulated from the CPU (33) and detects a call signal from the line. It includes an incoming call detection circuit (32) that transmits information to CPt1 (33), a CPU (33) that controls each component, and an elevator transmission ink face (34) between the elevator and the elevator. In addition, C is a capacitor added to the incoming voltage detection circuit (32), L...
, L2 is the connection line connected to the telephone line side, T, ,
T2 is a line for serially connecting the next remote monitoring device to the telephone line.

However, in the conventional remote monitoring system described above, the remote monitoring devices (3a), (3b), (
3c) each has an incoming call detection circuit (32), but since it is not determined which device will respond when a call is received, the incoming call response function will not work properly when multiple devices are installed, and the incoming call detection Since the capacitance of the capacitor C added to the circuit (32) increases when viewed from the station when multiple units are connected, there is a problem in that the number of units that can be connected is limited due to legal capacity restrictions.

In addition, in order to check the status of each device from the center,
Even within the same building, each device requires one call from the center, increasing the number of communications and inefficient use.

Therefore, the inventor of the present invention has devised a remote monitoring system that can smoothly communicate with the center side even when multiple remote monitoring devices are connected to the same telephone line. Already proposed.

That is, the proposed remote monitoring system is a remote monitoring system in which a plurality of remote monitoring devices are connected to a central device via the same telephone line. Devices are connected in parallel, and each device is provided with a transmission interface for inter-device communication via a dedicated transmission line, and one of the remote monitoring devices is used as a parent device, and the other remote monitoring device is used as a slave device. The system is configured to control the line connection control relay contacts based on the control of a remote monitoring device as a remote monitoring device to control outgoing calls and incoming calls to and from the center.

In such a remote monitoring system, only the remote monitoring device acting as the base unit responds when a FI call is received, and in the case of an incoming call from another remote monitoring device acting as a slave unit, the call is notified and forwarded via a dedicated transmission line. When making a call, the remote monitoring device as a slave device notifies the remote monitoring device as a parent device via a dedicated transmission line and then makes a call.

(Problem to be Solved by the Invention) However, in the remote monitoring system as described above, if the remote monitoring device that is the parent unit does not operate due to some abnormality, the remote monitoring devices that are other slave units are There was a problem in that the abnormality could not be reported to the center device, and the remote monitoring devices of other normal child devices could not make or receive calls because the parent device did not work.

This invention was made in order to solve the above-mentioned problems.If the main unit does not operate due to an abnormality, other child units can report the abnormality to the center unit. The present invention provides a remote monitoring system that enables transmission and reception from and to a center device by switching to a central device.

[Means to solve the problem]

To achieve the above object, there is provided a remote monitoring system according to a first aspect of the present invention, in which a plurality of remote monitoring devices are connected to a center device via the same telephone line, each of which is connected to the same telephone line. Each device is connected in parallel via relay contacts for line connection control, and each device is provided with a transmission interface for inter-device communication via a dedicated transmission line. Using the monitoring device as a slave device, the relay contact for line connection control is controlled based on the control of the remote monitoring device as a parent device to control outgoing and receiving calls to and from the center, and remote monitoring is performed as the parent device. The device periodically requests a status signal from each remote monitoring device via the dedicated transmission line, and each remote monitoring device as a child device returns its own status signal to the remote monitoring device of the parent device. If there is no request for a status signal from the remote monitoring device, the abnormal condition is transmitted to the center device with different predetermined delay times.

Further, in the remote monitoring system according to the second invention, in the above configuration, when the center device receives an abnormal state from the remote monitoring device of the first slave device, the center device designates the remote monitoring device as the base device. This is what I did.

[Effect]

In the remote monitoring system of the first invention, the delay times for the remote monitoring devices, which are slave units, to transmit abnormal conditions to the center unit are set to different times so that the slave units do not collide with each other on the telephone line. By doing so, each child device can send an abnormal state to the center device.

In the remote monitoring system of the second aspect of the invention, the child device that first transmits the abnormality of the parent device to the center device becomes the new parent device and performs calling and transmission.

(Embodiment) Hereinafter, an embodiment according to the first and second inventions will be described based on Fig. 1. In Fig. 1, the same parts as in Fig. 4 are given the same reference numerals, and the explanation thereof will be omitted. In the embodiment shown in FIG. 1, each remote monitoring device (
30a), (30b), and (30c), as represented by the remote monitoring device (30a), in addition to the configuration shown in FIG. 4, each device is connected by a dedicated transmission line (7). An inter-device transmission ink face (35) is provided to control the lines between the devices, and is also provided between the lines Ll, L2 and the line closing relay contact S. (4) and electrical (DC and AC)
A line connection control relay contact P is provided to close or open the circuit, and is controlled by the CPU (33).

Furthermore, each device (30a), (30b), (3
0C) (7) The connection lines R,, L, are connected in parallel to the telephone line (4) from the office, and there is no line T,, T2 that connects the conventional devices in series.

Each remote monitoring device (30
In a), (30b), and (30c), for example, the remote monitoring device (30a) becomes the base unit, and when a call is received, only this remote monitoring device (30a) as the base unit responds, and other slave units respond. In the case of an incoming call from the remote monitoring device (30b) or (30c), it is notified and transferred via the dedicated transmission line (7), and when making a call, the remote monitoring device (30
b).

(30c) sends a notification to the remote monitoring device (30a) serving as a base unit via a dedicated transmission line (7), and the remote monitoring device (30a) serving as the base unit When there is no status signal request from the center device (30b) and (30c), the slave devices (30b) and (30c) communicate with the center device (30b) and (30c) with different delay times.
6), and further, when the center device (6) receives the abnormal condition from each remote monitoring device as the first slave device, the center device (6) transmits the abnormal state to each remote monitoring device as the first slave device. The remote monitoring device is designated as the parent device.

Next, regarding the first invention, the operation of this embodiment will be explained using the sequence shown in FIG. In addition, each remote monitoring device (
30a), (30b), (30c) in sequence
, 1°No, 2. It is called No.3. During normal operation, the remote monitoring device No. 1 (30a), which is the parent device, periodically (for example, every hour) communicates with the remote monitoring device No. 2, which is the slave device, via the dedicated transmission line (7). No. 3 (30b),
A remote monitoring device (30b) that transmits a status return request to (30c) and is a slave device.

(30c) sequentially transmits status signals to the remote monitoring device No. 1 (30a) which is the parent device via the dedicated transmission line (7), and the remote monitoring device No. 1 (30a) which is the parent device is connected to the telephone line. (4), it transmits its own status signal together with the status signals of the remote monitoring devices (30b) and (30c) of the slave devices to the center device (6).

Also, due to some abnormality, the main remote monitoring device (
At the predetermined time when the status return request from 30a) is received, the remote monitoring device No. 2. No. 3 (30b).

(30c), the remote monitoring/device No. 2 and NoJ (30b), (3
0c) have different predetermined delay times (for example, the maximum communication time for one time is 5 minutes, No. 2 remote monitoring device (30b): 5 minute delay, No. 3 remote monitoring device (30c) After a 10-minute delay), each remote monitoring device (30b), (30c), which is a slave device, reports the abnormal state to the center device (6).

Regarding the invention 's2, the operation of this embodiment will be explained using the sequence shown in FIG. The remote monitoring device No. 2 (3 (lb), which is a slave unit, detects an abnormal condition from the center unit (
6) is the same as the embodiment of the first invention, but the center device (6) receives the abnormal state from the remote monitoring device No. 2 (30b), which is the first abnormal state notification. Upon receiving the notification, the remote monitoring device No. 2
(30b) is designated as the parent device.

Remote monitoring device No. 2 (30b
) starts operating in the same way as when the remote monitoring device No. 1 (30a), which is the parent device, is normal. In addition, remote monitoring device N
When o,3 (30c) receives the status return request from remote monitoring device No.2 (30b) via the dedicated transmission line (7), it stops reporting the abnormal condition to the center device (6),
Return to normal operation.

[Effects of the Invention] As described above, according to the first invention, when the remote monitoring device serving as the parent device does not operate due to some abnormality, the remote monitoring device serving as the other slave device informs the center device of the abnormality. You can report it.

Further, according to the second invention, if the remote monitoring device serving as a parent device does not operate due to some abnormality, other remote monitoring devices serving as slave devices become the parent device. Other remote monitoring devices can make and receive calls.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram according to an embodiment of the present invention, FIGS. 2 and 3 are sequence explanatory diagrams in FIG.
The figure is a system configuration diagram of a conventional example. (2a) ~ (2c)...Elevator, (30a) ~
(30b)...Remote monitoring device, (4)...Telephone line, (6)...Center device, (7)...Dedicated transmission line, P...Relay contact for line connection control, ( 31)...Modem, (32)...Nursing detection circuit, (33)...CPU. (34)...Elevator transmission interface, (35
)...Transmission interface between devices.

Claims (2)

[Claims] (1) In a remote monitoring system in which multiple remote monitoring devices are connected to a central device via the same telephone line,
Each device is connected in parallel to the same telephone line through a relay contact for controlling line connection, and each device is provided with a transmission interface for performing inter-device communication through a dedicated transmission line,
One of the remote monitoring devices is used as a parent device, and the other remote monitoring device is used as a slave device, and the above-mentioned line connection control relay contact is controlled based on the control of the remote monitoring device serving as the parent device, and transmission is made between the center and the remote monitoring device. At the same time, the remote monitoring device as the parent device periodically requests a status signal from each remote monitoring device via the dedicated transmission line, and each remote monitoring device as a slave device sends its own status signal. is returned to the remote monitoring device of the parent device, and if there is no request for a status signal from the remote monitoring device serving as the parent device, the abnormal state is transmitted to the center device with different delay times determined respectively. Features remote monitoring system. (2) In the remote monitoring system according to claim 1, when the center device receives an abnormal state from the remote monitoring device of the first child device, it designates the remote monitoring device as the parent device. remote monitoring system.