JPH02137434A - Remote monitor and control equipment - Google Patents

Abstract

PURPOSE:To shorten the data collecting time of all terminal equipments by permitting all the terminal equipments to perform monitor and return in a time zone allocated to the self-terminal equipment by means of one call from a central unit. CONSTITUTION:The central unit 1 transmits monitor and control signals for the terminal equipments R1-Rn and it consists of a transmission/reception circuit 12 which sequentially receives a monitor and returning signal from the equipment concerned with respect to the same signal, and an all terminals supervisory circuit 22 which simultaneously calls respective terminal equipment and controls the transmission/reception circuit 12 so that it cyclically monitor the terminal equipment. When the central unit 1 transmits a call signal CX to a transmission line (l), respective terminal equipments R1-Rn transmit the monitor and returning signal to the central unit 1 through the transmission line (l) when it comes to the time zone when the self-terminal equipment returns the signal. The monitor and returning signal of the terminal equipments is transmitted to the central unit 1 by one terminal call signal CX by the action.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote monitoring and control device that enables cyclic monitoring of a plurality of terminals from a central device.

[Conventional technology]

Figure @3 is a block diagram showing a configuration example of a conventional remote monitoring and control device disclosed in, for example, Japanese Unexamined Patent Publication No. 59-28743. Multiple terminal bags @ (R1), (R2
), ... (Rn).

Here, the central device (1) is the terminal device t(R1).

(R2), . . . , (Rn), and a transmitting/receiving circuit (111) that sends out monitoring and control signals and receives a monitoring return signal from the same device in response to the signal, and each of the above terminal bags! (R1), ( R2), ・-(Rn) are sequentially called,
The transmitting/receiving circuit (
A sequential monitoring circuit 121) for controlling 1υ. In addition, each terminal bag fi(R1) I(R2),...
(Rn) is assigned a unique address.

Next, the operation will be explained. FIG. 4(a) shows the case where each terminal device is constantly cyclically called and monitored, as shown in FIG. 4(b).
1 and 2 respectively show how a specific terminal device is controlled.

In FIG. 4(a), the central device (1) first sends a monitoring request signal to the terminal device (R1), and in response, the terminal device (R1) sends back a monitoring return signal, which is then received. Then, a monitoring request signal is sent to the terminal device (R2), and the monitoring return signal is similarly received. Hereafter, the monitoring operation up to the terminal bag @ (Rn) is performed in the same way,
Next, iterative terminal devices (R1), (R2), (Rn
l) Perform a monitoring operation and repeat this operation. These series of repetitive operations are performed by the sequential monitoring control circuit +21)
is controlled by

Next, a case will be described in which a specific terminal device is controlled.

In FIG. 4(b), in a state where cyclic call monitoring is being performed at all times as shown in FIG. 4(a),
The operator selects a specific terminal device (here, the terminal bag fl
(R1)) is selected, the sequential monitoring control circuit (2) is selected.
1) interrupts the above-described cyclic call monitoring operation and continuously monitors only the selected terminal device (R1). however,
The sequential monitoring control circuit (21) waits for the operation currently in progress, that is, in FIG. 4(b), the completion of reception of the monitoring return signal from the terminal device (R2), and then controls the selected terminal device (CR1).
control so that only continuous monitoring is performed. Thereafter, the operator selects and controls the controlled equipment and cancels the selection of the terminal bag @(R1), but the supervisory control circuit (21) sequentially controls the operation of the central unit @(1) in the same way.

In addition, here, the central outfit tl'I! The control operations from 11 are based on three behavior operations: terminal selection, controlled device selection, and control.

Next, when the operator selects a controlled device, the central device (1) sends a controlled device selection signal to the terminal device (R1). When the terminal device f (R1) receives this signal, it selects the controlled device and also sends back a monitoring return signal.

Next, when the operator issues a control command, the central device (1)
sends a control signal to the terminal device (R1). When the terminal device (R1) receives this signal.

It controls the device and sends back a monitoring return signal. When the operator confirms that the device is controlled, he deselects the terminal device (R1).

As a result, the sequential monitoring control circuit 121) resumes the cyclic call monitoring operation. Normally, the cyclic call monitoring operation is restarted from the terminal device where it was interrupted first, which is the terminal device (R2) in the example of FIG. 4(b).

As mentioned above, since a single remote monitoring and control device uses a polling method, only one set of transmitter/receiver circuit (1υ) of the central device (1) is required, and the transmission path (1) also has multiple terminal devices (R1).
, (R2), -... (Rn) creates a shared sulco,
It becomes possible to configure the device at relatively low cost.

Also, all terminal bags @ (R1) at all times.

(R2),... (Rn) are monitored sequentially, so
Even if there is a change in the status of a monitoring item on a specific terminal device (such as an abnormality in the monitored control device), it is immediately reported to the central device (
1) and can be displayed.

[Problem to be solved by the invention 1 Since the conventional polling-type remote monitoring and control system is configured as described above, - Since the central device calls each terminal device, it cannot monitor and return all terminal devices.・In addition, when selectively controlling a specific terminal device, cyclic monitoring is interrupted, so if there is a change in the status of the monitored items of other terminal devices (such as an abnormality in the monitored control device, etc.) ), if there is
It takes time for the central device to understand the status.

There were issues such as:

This invention was made in order to solve the above-mentioned problems, and provides a remote monitoring and control device that can shorten the data collection time of all terminal devices and also allows cyclic monitoring even when selectively controlling a specific terminal device. The purpose is to obtain.

[Means to solve the problem]

The remote monitoring and control device according to the present invention provides one
In one call, all terminal devices perform monitoring and return transmissions during the time slot assigned to their own terminal devices.

[Effect]

In this invention, the monitoring return time period assigned to the own terminal device is generated from the unique address assigned to each terminal device, so that the monitoring return times of each terminal device do not conflict on the transmission path.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 11) is a central device that connects multiple terminal devices (R1) via a single line transmission path <1).

(R2), ... (Rn) are connected. Here, the central device (1) is the terminal device (R1), (R2)
, . . . , (Rn), and a transmitting/receiving circuit (1) that sends out monitoring and control signals for the signals and sequentially receives monitoring return signals from the same device in response to the signals, and each of the terminal devices 1 (
Call R1), (R2), ... (Rn) all at once,
The above transmitter/receiver circuit 0 is configured to cyclically monitor the terminal device.
It consists of an all-terminal monitoring circuit that controls z.

Also, each terminal bag @ (R1), (R2), ...<Rn)
receives the terminal address (4 is assigned to it. Also, the return time control unit (■) for calls from the central device (1)), monitors and control signals from the central device (1), and receives the signals. monitoring return, equipment selection return,
It consists of a transmitting/receiving circuit (1 and 1) that transmits each control return signal.

Next, the operation will be explained.

FIG. 2(a) shows a case where the monitoring return signals from each terminal device are cyclically monitored, and FIG. 2(b) shows a case where a specific terminal device is controlled.

In FIG. 2(a), the central device (1) sends a terminal call signal (Cx) to the transmission line (1). Each terminal device (R
1), (R2), ---(Rn) receives the terminal call signal (CX) in the transmitting/receiving circuit (13) and passes the result to the return time control unit (3).Return time control unit (2)
refers to the terminal address (4υ) and informs the transmitting/receiving circuit (1) that it is time for the own terminal to send back data.
Send a monitoring return signal to 1).

With the above operation, the monitoring return signals of all terminal devices are transmitted to the central device ti+ by one terminal call signal (CX). After the return time from all terminal devices has elapsed, the central device (1) sends the terminal call signal (CX) again to the transmission path (1).
). The same operation is repeated thereafter. These series of repeated operations are controlled by all terminal monitoring units.

Next, the case of controlling a specific terminal device will be described. In FIG. 2(b), when the operator selects a device to be controlled for a specific terminal device (terminal device (R1) here), all the terminal monitoring units check the terminal address (411). Immediately after receiving the last monitoring return signal from the terminal device, the terminal device call signal and the terminal device (R
The transmitter/receiver circuit 112 is notified to send the device selection signal (C1) for 1).

The terminal device calling signal and the device selection signal (C1) for the terminal device (R1) are sent to the terminal device! f(R1).

(R2), . . . (Rn) passes the name received by the transmitting/receiving circuit (13) and the result to the return time control unit 311.

The return time control unit l31) refers to the terminal address 141) and notifies the transmitting/receiving circuit +t3 that the time period for the own terminal device to send back has arrived.

Note that since the terminal bag flfffi (R1) matches the own terminal address and the device selection for the terminal bag @ (R1), the transmitting/receiving circuit +13 of the terminal device (R1) is
A return signal in response to the device selection is transmitted to the central device (1) via the transmission path (1).

On the other hand, terminal devices (R2゜...) other than the terminal device (R1)
Rn) has a mismatch in its own terminal address and the device selection for the terminal device (R1), and the central device (1
) sends a monitoring return signal. Next, when the operator issues a command to control the controlled device to the terminal device (R1),
Immediately after receiving the monitoring return signal from the terminal device whose terminal address LD is the final one, the all terminal monitoring unit (or LD) immediately sends the terminal device calling signal and the control signal (R1) to the terminal bag @(R1).
C2) is sent to the transmitter/receiver circuit 11.

The terminal device calling signal and the control signal (C2) for the terminal device (R1) are transmitted to one terminal device (R1), (R2), . . .
When (Rn) receives the result at the transmitting/receiving circuit (13), it passes the result to the return time control unit 1'ID.The return time control unit Gυ refers to the terminal address (41J) and determines the time period in which the own terminal device will return the data. This is notified to the transmitter/receiver circuit f13).

Note that since the terminal device (R1) matches its own terminal address and the control over the terminal device (R1),
The transmission/reception circuit (11J) of the terminal device (R1) is the transmission line (j
) sends a return signal for control to the central unit (1).

On the other hand, the terminal bag NCR2゜other than the terminal device (R1)...
Rn) has a mismatch between its own terminal address and control over the terminal device (R1), and transmits a monitoring return signal to the central device (1). When the operator confirms that the device in question has been controlled (end of control over the terminal device (R1)), the all terminal monitoring unit (2) checks the terminal address (4).
After receiving the monitor return signal from the terminal device whose final value is υ, the terminal device enters a normal calling state (monitoring by monitor return signals from all terminal devices).

In addition, in the above embodiment, the return from the terminal device is (R1)
, (R2), = (Rn) (7) Although it was explained in this order, (R1), (R2) within one cycle time.

... The return order does not matter as long as (Rn) is returned (for example, Rn, ... R2゜R1
), the same effect as the above embodiment is achieved.

〔Effect of the invention〕

As described above, according to the present invention, data can be sent back from all terminal devices with a single call from the central device, so data collection time for all terminal devices can be shortened. Even when a device is controlled, the monitoring and feedback from other terminal devices does not stop, and there is an effect that the terminal device can be smoothly monitored and controlled, and changes in its status can be detected immediately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a remote monitoring and control device according to an embodiment of the present invention, FIGS. 2(a) and 2(b) are time charts for explaining the invention in detail, and FIG. 3 and @
FIGS. 4(a) and 4(b) are a block diagram and a time chart of a conventional remote monitoring and control device. q is the transmitting/receiving circuit of the central device, f13 is the transmitting/receiving circuit of the terminal device, Ha is the all terminal monitoring section, (2) is the return time control section, and Ill is the terminal address. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a polling type remote monitoring and control device that monitors and controls the terminal devices of each station in response to calls from the central device, the above terminal devices are called all at once, and each of the above terminal devices sequentially returns to its own station in response to this call signal. A monitoring return signal is sent to the central device during the allotted time period, and the central device performs cyclic monitoring, and when selectively controlling a specific terminal device from the central device, the selected specific terminal The device returns to the central device a return signal corresponding to a command signal such as a device selection command or a control command for the controlled device from the central device during the allocated time slot of its own station, and transmits a return signal to the central device in response to a command signal such as a device selection command or a control command for the controlled device from the central device, and transmits a return signal to the central device in the allocated time zone of the own station. A remote monitoring and control device characterized in that the device performs cyclic monitoring by sending back a monitoring return signal during the allocated time slot of its own station.