JPH0819068A - Remote monitoring and controlling system - Google Patents

Abstract

PURPOSE:To enable the remote monitoring controller to set and revise a control variable of a device to be controlled in details and to attain proper control even in the case of the occurrence of a broken line. CONSTITUTION:In the remote monitoring and controlling system in which a control variable of a device 3 to be controlled is set remotely from a master station 1 via a slave station 2, the master station 1 is provided with a timer 31, a timer synchronization data input means 32 entering data synchronously with the timer 31, and a timer compression data transmission section 7. The timer compression data transmission section 7 compresses data (only a change in time and setting value) and sends them to the slave station 2. The slave station 2 is provided with a memory 11 storing the compressed data by a time T and a timer 10, and the data compressed by the timer 10 are restored to original data and outputted to the device 3 to be controlled as setting data C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a remote monitoring control device (hereinafter referred to as "TM /
"TC device").

[0002]

2. Description of the Related Art Conventionally, analog setting value control composed of a TM / TC device is transmitted from a master station to a slave station every time the setting is changed, and a setting change output is controlled and output to a controlled device. .

FIG. 3 is a block diagram of a conventional example, in which 1 is a master station, 2 is a slave station, and 3 is a controlled device connected to the slave station 2. Specifically, the controlled device 3 is, for example, a plant such as water supply or gas equipment, and the set value is, for example, a flow rate, a pressure, a rotation speed, or the like.

The master station 1 comprises a digital input section 5, an A / D conversion section 6 for converting an analog signal into a digital signal, and a P / S conversion section 8 for converting a parallel signal into a serial signal. The A / D conversion unit 6 is connected with a manual input means 21 for manually inputting an analog set value (set value data), and the digital input unit 5 has a manual setting switch 22.
Is connected, and the analog input value is input by the manual input means 21, and the data is input by turning on the setting switch 22.

The analog set value is A / D converted by the A / D converter 6.
The converted signal is converted into a serial signal by the P / S converter and sent to the slave station 2 via the transmission line 4.

In the slave station 2, the serial signal from the master station 1 is converted into a parallel signal by the S / P conversion section 9, and the digital output section 12 and the D / A conversion section 13 output a manual setting signal M (at the time of manual operation). Write signal) and the analog set value C are output to the controlled device 3, and the set value is changed accordingly.

[0007]

In the conventional set value control, each time the set value is changed, the master station must output the setting change to the slave station. Since the setting value changes when the setting is changed, as shown in FIG.
Changes gradually, and the range of change also becomes large. Therefore, in order to perform fine control, the setting must be changed at all times.

Further, when the transmission line is abnormal, the master station cannot transmit to the slave station. Therefore, conventionally, when the transmission line is broken,
There was no choice but to control the setting value when the wire was broken. That is, there is a problem that proper control cannot be performed when the line is disconnected.

The present invention has been made in view of the above points. In the TM / TC device, it is possible to finely change the setting of the control value of the controlled device and to perform an appropriate control even when the line is disconnected. The purpose is to be able to.

[0010]

In the present invention, attention is paid to the fact that the set value of the controlled device generally repeats the same pattern in a certain cycle, and data for a predetermined time is sent from the master station in advance, The slave station stores it, restores the original data according to time, and outputs the set value data to the controlled device.

That is, according to the present invention, in the remote monitoring control method in which the control value of the controlled device is remotely set from the master station via the slave station, the data transmission for transmitting the setting value data related to time to the master station. A means is provided. The slave station is provided with a means for storing the set value data, and a means for outputting the set value data to the controlled device in real time based on the set value data.

[0012]

Since the setting data for a predetermined time is sent in advance, the controlled device is controlled by the data sent in advance even if the line is disconnected thereafter. Moreover, since data transmission can be performed in advance in association with time, it is possible to perform fine control according to the characteristics of the controlled device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, in which the same components as those in FIG. 3 are designated by the same reference numerals.

A timer 31 is provided in the digital input section 5 of the master station 1.
Is connected, and the set value data is input to the A / D conversion unit 6 in synchronization with the timer 31 (for example, at a certain time,
A timer synchronization data input means 33 for inputting a certain set value) is connected. Further, a timer compressed data transmission unit 7 is connected between the digital input unit 5, the A / D conversion unit 6, and the P / S conversion unit 8.

In the timer compressed data transmission section 7, the change amount ΔP of the set value with respect to the change amount Δt of time is compared from the timer signal input from the timer 31 and the set value data input from the data input means 32. Then, points that change with the same ratio are obtained, and Δt ₁ and ΔP ₁ are transmitted to the P / S conversion unit 8 (see FIG. 2). Further, the time of the changing point and the set change amount such as the following changes Δt ₂ and ΔP ₂ , and similarly Δt ₃ and ΔP ₃ are converted into a serial signal by the P / S converter,
It is transmitted to the slave station 2 through the transmission line 4.

In the slave station 2, the timer 10 and the memory 11 for T hours (for example, one day) are provided between the S / P converter 9 and the digital output unit 12 and the D / A converter 13.
Is connected. The serial signal sent from the master station 1 is converted into a parallel signal by the S / P converter 9,
Data for T hours is always stored in the time memory 11. The timer 10 outputs the contents of the T time memory 11 in synchronization with the timer 10, the D / A converter 13 converts the contents into an analog amount, and the changed output value is always output in real time to the controlled device 3 (that is, the time The set value changes with the passage of time).

In response to the signal from the timer 10, the digital output unit 12 outputs the remote signal R (write signal when memory data is output) and the set value data C to the controlled device 3. When the remote signal R is issued, the controlled device 3 is controlled based on the data from the memory 11 even when the data is not sent from the transmission path 4 (disconnection or the like).

In the apparatus of this embodiment, the set value can be manually changed by the manual setting switch 22 and the manual input means 21 as in the conventional apparatus shown in FIG. In that case, the manual setting signal M from the digital output unit 12 of the slave station 2 is the same as in FIG.
Further, the D / A converter 13 outputs the set value data C to the controlled device 3.

In the above-mentioned device, a predetermined time (for example, one day) is preset from the timer synchronization data input means 32.
If you input the analog setting value for minutes, this data
Is sent to the controlled device 3 according to the time set based on the time information from the timer 10 and stored in the memory 11 of the slave station 2.

Therefore, it is possible to freely change the setting of the control value. For example, as shown in FIG. 2, the setting value can be continuously and smoothly set, and fine control can be performed. Further, since data for a predetermined time is stored even when the wire is disconnected, it is not necessary to use the set value when the wire is disconnected as in the conventional case, and appropriate control can be performed with a preset control value.

In the above embodiment, the data synchronized with the timer is used as the data associated with the time. However, the present invention is not limited to this. In short, the data for a predetermined time is sent to the slave station in advance, and the slave station The set value of the control device may be changed in real time based on this data.

[0022]

The present invention provides a time-related T from the master station.
The control data for the time is sent to the slave station, the data for the T time is stored in the slave station, and the data is sent to the controlled device in time, so that fine control with a small change width is possible. Further, even if an abnormality occurs in the transmission line, since the data for the time T is held in the slave station, it is possible to control the set value in real time without the middle stage of the control output.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the embodiment of FIG.

FIG. 3 is a block diagram of a conventional distant monitoring control device.

FIG. 4 is an operation explanatory diagram of a conventional device.

[Explanation of symbols]

 1 TM / TC master station 2 TM / TC slave station 3 controlled device 4 transmission path 5 digital input section 6 A / D conversion section 7 timer compressed data transmission section 8 P / S conversion section 9 S / P conversion section 21 manual input Means 22 Manual setting means 31 Timer 32 Timer synchronization data input means

Claims (3)

[Claims] 1. In a remote monitoring control method for remotely setting a control value of a controlled device from a master station via a slave station, the master station is provided with a data transmission means for sending set value data associated with time, A remote monitoring control system characterized in that the slave station is provided with a storage means for storing the data for a predetermined time and a means for outputting set value data to the controlled device in real time based on the data. 2. In a remote monitoring control method for remotely setting a control value of a controlled device from a master station via a slave station, the master station sends set value data associated with time, and the slave station receives the data. And storing the set value data in real time based on the data, and outputting the set value data to the controlled device. 3. In a remote monitoring control method for remotely setting a control value of a controlled device from a master station via a slave station, the master station compresses data for a predetermined time in synchronization with a timer and the timer. In addition to providing means for transmitting, the slave station is provided with means for storing the compressed data, a timer, and means for returning the data compressed by the timer to the original data and outputting it to the controlled device. A remote monitoring and control method characterized by that.