JPS60154738A - Remote supervisory control system - Google Patents

Abstract

PURPOSE:To eliminate the limitation of installing place of a subsupervisory controller by transmitting a supervisory content returned from a terminal device as a control signal to change the content of the control signal fed to the terminal device in response to the content of a return signal in succession to the control signal. CONSTITUTION:A fault output section 11 of an announciator 9 reads a control signal in succession to an address signal when the address signal on a signal transmission line 1 and the own address are coincident, and produces an output in response to the control signal. Then a individual operation switch 12 sets the return signal for individual control of the terminal device returned during the succeeding return standby signal period after the control signal. Then a central supervisory controller transmits the supervisory content returned from the terminal device as the control signal in successing to the address signal calling the announciator 9 and changes the content of the control signal transmitted to the terminal device in response to the content of the return signal during the return signal period in successing to the control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a remote monitoring and control system using a time division multiplex transmission method.

[Background technology]

FIG. 1 is a block diagram of a conventional remote monitoring and control system using a time division multiplex transmission method. In the figure, (1) is a two-wire signal transmission line, through which time division multiplexed transmission signals based on a baseband transmission system are transmitted. signal transmission line f
A plurality of terminal devices (2) are connected in parallel to I, and each terminal device (2) is assigned a unique address. A transmission unit (4) of the central supervisory control device (3) is connected to the signal transmission line fl), and an address signal for selecting each terminal (2) on the signal transmission line ill and a terminal selected by the address signal are transmitted on the signal transmission line ill. terminal device (2) K
A control signal that gives control commands to the terminal device (2
) A return standby signal in the form of a long pulse indicating a waiting period for a return signal by a current t-do is transmitted in a time-division manner. The transmission unit (4) is fully controlled by the main CPU (5) within the central supervisory control unit (3). This main CPU +6+ has a ten board (6) connected as an input device, and a CRT +71 and a printer (8) as output devices.
is connected. (9) is an annunciator, which is a sub-monitoring control device, which selects a special number of equipment such as air conditioning and lighting from all the control points by terminal device (2), controls their start/stop, monitors their status, and monitors abnormalities. It is for monitoring. However, in such a conventional example, the annunciator (9) is connected to the main CPU in the central supervisory control device (3).
(5), and therefore the annunciator (
There was a problem in that the installation location of 9) was limited to the very vicinity of the central monitoring and control device (3).

[Purpose of the invention]

The present invention has been made in view of the above points,
It is an object of the present invention to provide a remote monitoring and control system in which the location for installing a submonitoring and controlling device can be freely set.

[Disclosure of the invention]

Hereinafter, the structure of the invention will be explained with reference to illustrated embodiments.
As shown in Figures 2 to 6, a plurality of terminal devices (2) to which unique addresses are assigned and a central monitoring and control unit (
3) are connected to each other via a two-wire signal transmission line (1), and an address signal for selecting a specific terminal (2) from the central supervisory control unit (3) to the signal transmission line +1); A control signal giving a control command to the terminal device (2) and a cough terminal device (2)
In a remote monitoring and control system in which a transmission signal in which a transmission signal is arranged in a time-division manner and a return standby signal indicating a reception period of a return signal from a remote control terminal is cyclically transmitted to each address in sequence, a transmission signal connected to a signal transmission line fl+ , signal transmission line (1)
When the above address signal matches its own address, a display section (101) serving as a monitoring output section that reads the control signal following the address signal and outputs an output according to the control signal and an abnormality output section (101) that reads the control signal following the address signal and outputs the control signal An annunciator (9) is provided as a sub-monitoring control device having an individual operation switch unit 02) for setting a return signal for individual control of the terminal device (2) that is returned during the return standby signal period following the return standby signal period, and central monitoring control is carried out. The device (3) sends out the monitoring contents returned from the terminal device (2) as a control signal following the address signal that calls the annunciator (9), and responds to the contents of the return signal during the return signal period following the control signal. The annunciator (9) has a transmission interface (13) connected to the signal transmission line (]). The transmission interface θ field is transmitted from another terminal device (
Perform the same reception and reply operations as in 2). That is, the transmission interface θ:i of the annunciator (9)
1 compares the address signal on the signal transmission line (1) with its own address, and when they match, reads the control signal following the address signal and sends a preset return signal following the control signal. During the return standby signal period, the signal is returned to the central monitoring and control device (3) in current mode or the like.

In this way, the transmission interface of the annunciator (9) has its own address, and the signal transmission line fi
Since the annunciator (9) of this embodiment can receive the control signal on the
) can be connected to any position on the signal transmission line (1) in the same way as the other terminal device I2). In addition, the annunciator (9) stores the operation of the CPU θ4) and the CPU PuO2), and the CPU (14).
Data R that stores data required during the operation of 1.
A M ++6), etc. Note that the display section (10
) is used to display the on/off status or abnormality of the terminal (2) using a plurality of LEDs and the like. The abnormality output section (Iil has a contact output, output collector output, TTL output, etc. for transmitting abnormalities to external equipment, etc.).In addition, the individual operation switch section (Iil has multiple switch groups) , from the annunciator (9) to the terminal (2
) so that the content of the address signal and control signal can be set when individually controlling the controllers.

The operation of this embodiment will be explained below. First, the terminal (2
), the case where the start/stop monitoring display and the abnormality monitoring display are performed will be explained. For example, when an air conditioner is turned on, the monitoring input of a terminal device (2) connected to the air conditioner changes, and the central monitoring and control device (3) detects the change in the monitoring input as a reply signal. This allows the central monitoring and control device (3)
displays the change in the monitoring input of the user, and at the same time sends a control signal to the address of the annunciator (9), indicating the content of the monitoring input and the address of the terminal device (2) that has returned the monitoring input. Transmit as. Anansheta (9)
) decodes the received control signal according to the conversion tool on the data RAM 116) and changes the entire display content on the display section (10). If the content of the monitoring input indicates any abnormality, the LED corresponding to the abnormality is lit on the display section QOI K, and the abnormality output section (1
1) provides relay contact output etc. to external equipment.

Next, when performing individual control of the terminal device (2) by the annunciator (9), operate the individual operation switch section (control) of the annunciator (9). At this time, the CPU Ui4 of the annunciator (9) It determines whether a switch has been operated and transmits the result from the interface 0 to the central monitoring and control unit (3) via the signal transmission line i11.
This is a reply to be sent as a return signal. The central supervisory control device (3) uses a data conversion table etc. from the return signal sent back from the annunciator (9) to create an address signal and a control signal for the terminal device (2) corresponding to the above switch operation, Send to signal transmission line (+). This makes it possible to individually control the terminal device (2) from the annunciator (I).

FIG. 4 is a block diagram showing the configuration of the transmission unit (4) in the central supervisory control device (3). In the same figure,
The logic operation section Q'7) receives operation input from the main CPU t51 or operation input section 08), or the reception fee section -
Information on terminal monitoring input from, especially annunciator (9)
Based on the monitoring input information from
Calculate and change the contents of. Further, the logic operation unit Oη is
In addition to outputting a display signal to the display section 11, it also calculates the terminal address to be transmitted and its control data in synchronization with the transmission output in the transmission signal generation section (a), and sends it to the transmission signal generation section 11. It is something to do. The transmission signal generation section (c) converts the address signal and control signal sent from the logic operation section θ into a transmission waveform and sends it to the transmission section array, and also sends a synchronization signal to the logic operation section ση as described above. Send. The transmitter (c) converts the signal sent from the transmitter signal generator (b) into a transmitter signal, and sends it to the terminal (2). The received signal detection section (goods) is a terminal device (2)
The reception fee foot θ9) is detected by detecting the return signal sent from
It is to be sent to. The reception determining section a determines whether the returned signal is correct data or not, and if the data is correct, sends the data to the logical operation section.

Fig. 5 is a diagram showing the configuration of the terminal device (2) connected to the signal transmission line (]), and Fig. 0 is an operation explanatory diagram showing the timing of signal transmission and reception of the terminal device (2). . Fifth
In the figure, the input voltage from the signal transmission line (1) is on the power source for driving the terminal logic circuit section 2 and control relay 027) by the terminal power supply conversion section (to). On the other hand, the signal input is half-wave rectified by the input protection section C8 to reduce the voltage, and the input signal between the terminal logic circuit sections (Fig. 6 (a))
becomes. In response to this input signal, the oscillator section (c) oscillates according to the time constant of the oscillation element section (c), and the oscillation output is increased by the counter section (counter section). It is used as a signal. As a result, the logic i'[II control section C4 controls the address discriminating section side and the 1/j signal discriminating section 6(1) to read the address and control signal in the input signal. The address discriminator side checks whether the address signal is normal data or not, and the address setting section (
351 and the address match, and if they match, the control gate signal (Fig. 6(b)) is sent to the return output section -, and the same signal is also sent to the logic control section p2. send. - 10,000, the control signal discrimination section (to) checks whether the control signal is a normal signal, and if it is a normal control signal, sends a signal to the logic control section ROKU, and if the addresses match. Obtain the signal and set the control data to the relay drive switch output section C. Logic control section c';! J
Now, when the signals from the address discriminator and the control signal discriminator (to) are complete, the timing of the return signal (Fig. 6(C)) and the return gate output of 7G (Fig. 6(f)) are determined. A signal is sent between the return and output sections, and the monitoring input and response section side is activated. The monitoring human response unit tan is the monitoring unit! based on the timing from the counter unit 13+1. The state of the monitoring input from 39) is converted into a signal and sent to the return output section 136). Return output section (
3G), the return signal (FIG. 6(C)) from the monitoring input reply unit is sent to the signal transmission line ill as a signal of current t. Furthermore, in the logic control section 0, when the signals from the address discriminating section (33) and the control signal discriminating section (33) are aligned, a timing is determined to drive the control relay η consisting of a latching relay. The relay drive pulse signal 8 (Fig. 6 (C)) for making j is sent to the relay drive unit (4
0). As a result, the relay drive unit 140) outputs the latch output of the relay drive latch output unit i3η (Fig. 6(
d)) Drives the control relay (41) according to the load (41
).

〔Effect of the invention〕

The present invention is configured as described above, and is used in a remote monitoring and control system in which a plurality of terminal devices and a central monitoring and control device are connected by a signal transmission line using a time division multiplex transmission method. A monitoring output section which is connected and reads a control signal following the address signal when the address signal on the signal transmission line matches its own address and generates an output according to the control signal, and during a return standby signal period following the control signal. A sub-monitoring control device is provided with an individual operation switch section for setting a return signal for individual control of the terminal device, which is sent back to the central monitoring and control device. The returned monitoring content is sent as a control signal, and the content of the control signal sent to the terminal device is changed depending on the content of the returned signal during the returned signal period following the control signal, so the sub-monitoring The installation location of the control device is no longer limited to the vicinity of the central monitoring and control device as in the past, but the submonitoring and control device can be connected to any position on the signal transmission line. There is an advantage that the installation location of the supervisory control device can be set relatively freely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a block diagram of a remote monitoring and control system according to an embodiment of the present invention, and FIG. 5 is a block diagram of an annunciator used in the above system.
FIG. 4 is a block diagram of a central monitoring and control device used in the above system, FIG. 5 is a block diagram of a terminal device used in the above system, and FIG. 6 is an explanatory diagram of the operation of the above terminal device. fil is a signal transmission line, (2) is a terminal, (3) is a central monitoring and control unit, (9) is an annunciator, (lO) is a display unit, (1 is an abnormality output unit, and 0'4 is an individual operation switch. Department, (11 is the transmission interface. Agent Patent Attorney Ishi 1) Chief Seven

Claims (1)

[Claims] (1) Connect multiple terminals to which unique addresses have been assigned to the central supervisory control unit to each other via a two-wire signal transmission line, and connect a specific terminal from the central supervisory control unit to the signal transmission line. A transmission signal in which an address signal to be selected, a control signal giving a control command to the terminal device, and a return standby signal indicating a reception period for a return signal from the terminal device are arranged in a time-division manner is sequentially transmitted for each address. In a remote monitoring and control system that transmits data cyclically, it is connected to a signal transmission line, and when the address signal on the signal transmission line matches its own address, it reads the control signal following the address signal and responds to the control signal. a sub-monitoring and controlling device having a monitoring output unit that generates an output, and an individual operation switch unit that sets a return signal for individual control of the terminal device that is returned during a return standby signal period following the control signal 8; Following the address signal that calls the sub-monitoring control device, the central monitoring control device sends out the monitoring content returned from the terminal as a control signal, and depending on the content of the return signal during the return signal period following the control signal, 1. A remote monitoring and control system comprising a controller for changing the content of a control signal sent to a terminal device.