JPH0847052A - Remote supervisory and controlling system - Google Patents

Abstract

PURPOSE:To provide the remote supervisory and controlling system whose function is easily extended without the need for replacement of a transmission processing unit. CONSTITUTION:Plural control terminal equipments 2 and a control terminal equipment 3 are connected to a transmission processing unit 1 via a signal line Ls. The transmission processing unit 1 sends/receive data between the control terminal equipments 2 and the control terminal equipment 3 in the time division multiplex transmission system to control a load L connecting to the control terminal equipment 3 in response to the operation of a switch S provided to the control terminal equipments 2. An external extension device 11 is connected to the transmission processing unit 1 and external extension devices 12, 13 are connected even to he signal line Ls. The transmission processing unit controls the transmission of data to the control terminal equipments 2 and the control terminal equipment 3 by a command from the external extension devices 11-13 and the control result of the control terminal equipments 2 and a control terminal equipment 3 by the transmission processing unit is returned to the external extension devices 11-13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a plurality of terminals to a transmission processing apparatus via a two-wire type signal line, and transmits a transmission signal from the transmission processing apparatus to the terminals by a time division multiplex transmission system. By doing so, the present invention relates to a remote monitoring control system capable of controlling a load connected to another terminal device by operating a switch connected to the terminal device.

[0002]

2. Description of the Related Art Conventionally, there has been considered a remote monitoring control system in which a plurality of operation terminals and control terminals are branched and connected to a transmission processing device via a two-wire signal line. Addresses are set separately for the operation terminal and the control terminal, and the transmission processing device individually recognizes each operation terminal and each control terminal by the address. The operation terminal has a switch and transmits an interrupt signal generated by the operation of the switch to the transmission processing device. When the transmission processing device receives the interrupt signal, the operation processing terminal device searches for the operation terminal device requesting the interrupt, and further searches. The control data is transmitted to the control terminal device whose correspondence is preset by the address and the operation terminal device. The control terminal device that has received the control data controls the connected load in accordance with the operation of the switch.

Explaining in more detail, the remote monitoring and control system has, for example, a configuration shown in FIG. A plurality of operation terminals 2 for monitoring the operation state of the switch S and a plurality of control terminals 3 for controlling the load L are connected to the transmission processing device 1 through a two-wire signal line Ls. It Individual addresses are set to the operation terminal 2 and the control terminal 3, respectively, and the transmission processing device 1 individually recognizes the operation terminal 2 and the control terminal 3 using the addresses.

The transmission processing device 1 sends a transmission signal Vs having a format as shown in FIGS. 9A and 9B to the signal line Ls. That is, the transmission signal Vs is a start pulse ST indicating the start of signal transmission, a mode data signal MD indicating the signal mode, and an address data signal for transmitting address data for individually calling the operation terminal 2 and the control terminal 3. AD, a control data signal CD for transmitting control data for controlling the load L, a checksum data signal CS for detecting a transmission error, a time for receiving a return data signal from the operation terminal 2 or the control terminal 3. It is a multi-pole (± 24 V) time division multiplexed signal having a signal return period WT which is a slot, and data is transmitted by pulse width modulation.

Each operation terminal 2 and each control terminal 3
Then, when the address data transmitted by the transmission signal Vs received via the signal line Ls matches the preset address data, the control data is fetched from the transmission signal Vs, and at the same time as the signal return period WT of the transmission signal Vs. The return data is synchronized with the current mode signal (signal line L
It is sent back as a signal sent by short-circuiting the lines of s via a suitable low impedance.

Further, the transmission processing device 1 is provided with dummy signal transmitting means and interrupt signal processing means. The dummy signal transmitting means always sends out a dummy transmission signal in which the mode data signal MD is in the dummy mode. Further, the interrupt signal processing means, when receiving an interrupt signal Vi as shown in FIG. 9 (c) generated in response to the operation of the switch S in any of the operation terminals 2, the operation that generated the interrupt signal Vi. The terminal device 2 is searched for, and the address data set in the operating terminal device 2 is returned as reply data. That is, the dummy transmission signal is always sent to the signal line Ls by the dummy signal transmission means, and the interrupt signal Vi generated from the operation terminal device 2 in accordance with the operation of the switch S.
Is detected in synchronization with the start pulse signal ST of the dummy transmission signal, the transmission processing device 1 sends the transmission signal Vs in which the mode data signal MD is in the address confirmation mode by the interrupt processing means to the signal line Ls. Each operation terminal 2 sets an interrupt flag for requesting an interrupt when the interrupt signal Vi is generated, and the operation terminal 2 in which the interrupt flag is set has a mode data signal MD.
Receives the transmission signal Vs in the address confirmation mode, the address data set in the operation terminal device 2 is returned as reply data in synchronization with the signal return period WT of the transmission signal Vs. In this way, the transmission processing device 1 can obtain the address of the operating terminal device 2 that has generated the interrupt signal Vi.

In the transmission processing device 1, when the address of the operation terminal device 2 which has generated the interrupt signal Vi is acquired, it is transmitted to the control terminal device 3 to which the load L having the preset correspondence relationship with the switch S is connected. A transmission signal Vs that generates control data and includes the control data
Is transmitted to the signal line Ls, control data is transmitted to the corresponding control terminal device 3, and the load L is controlled.

In the operation terminal 2 and the control terminal 3, the transmission signal Vs transmitted on the signal line Ls is full-wave rectified and stabilized to obtain a power source for operating the internal circuit. ing. A power source is separately provided for the load L connected to the control terminal 3.

[0009]

By the way, in the above-mentioned remote monitoring control system, the load L is controlled according to a time schedule, communication with an external system is performed, and power recovery processing is performed at the time of power failure. When the functions of the transmission processing device 1 are to be expanded in order to realize various functions, it is necessary to provide the transmission processing device 1 having the expanded functions. That is, since the transmission processing device 1 includes a microcomputer and various functions are realized by programs, it is necessary to change the programs in order to expand the functions, and remote monitoring that is already installed. The control system has a problem that it is difficult to expand the function in the field. As a result, when the function is to be expanded in the existing remote monitoring and control system, the transmission processing device 1 is currently replaced.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and even in an existing system, remote monitoring control can be performed so that the function can be easily expanded without replacement of the transmission processing device. It is intended to provide a system.

[0011]

According to a first aspect of the present invention, a plurality of terminal devices each having an address are branched and connected to a transmission processing device through a two-wire signal line, and the transmission processing device is an address device. When the operation data is received when the operation data from the terminal is received during the signal return period set in synchronization with the transmission signal by individually accessing the terminals by sending the transmission signal containing data to the signal line by the time division multiplexing transmission method. Control data is generated based on the control data, and the control data is transmitted to another terminal device in which the correspondence between the terminal device that generated the operation data and the address is preset and the load connected to that terminal device is controlled. In the remote monitoring control system, the transmission processing device controls the transmission with the terminal device according to an instruction from the external expansion device provided separately from the transmission processing device to the transmission processing device, and The extended control unit to return the control result of the vessel to the external expansion device, characterized by comprising providing to the transmission processor.

According to a second aspect of the present invention, the transmission processing device is provided with an expansion connection unit for connecting the external expansion device to the expansion control unit. In the invention of claim 3, the external expansion device is connected to the signal line together with the terminal device, and the expansion control unit processes the instruction from the external expansion device separately from the data from the terminal device.

According to a fourth aspect of the invention, the expansion control unit is connectable to a plurality of types of external expansion devices.
According to a fifth aspect of the present invention, the transmission processing device transmits the transmission signal to the signal line in an asynchronous manner.

[0014]

According to the invention of claim 1, an extension controller is provided in the transmission processing device, and the transmission processing device controls transmission with the terminal device in response to an instruction from an external extension device provided separately from the transmission processing device, Since the control result is returned to the external expansion device, if the external expansion device is connected to the transmission processing device, the control of the terminal device can be managed in time, the control status of the terminal device can be transmitted to the external system, and the terminal device can be transmitted. The external expansion device can realize various functions such as recording the control state of the above, or giving an instruction for recovery in case of an abnormality such as a power failure. That is, the expandability of the remote monitoring control system is enhanced, and the functions of the remote monitoring control system can be flexibly selected. As a result, even in the existing remote monitoring and control system, the function can be expanded only by the work of adding the external expansion device, and the construction work becomes easy.

According to the second aspect of the present invention, since the transmission processing device is provided with the expansion connection unit and the external expansion device is connected to the expansion connection unit, the external expansion device is connected to the external expansion device without affecting the data transmission with the terminal device. Communication becomes possible. According to the invention of claim 3, the external extension device is connected to the signal line together with the terminal device, and the extension control unit provided in the transmission processing device separates the transmission signal to and from the terminal device from the instruction from the external extension device. The function can be expanded by a simple construction in which an external expansion device is connected to the signal line in the existing remote monitoring and control system.

According to the invention of claim 4, since a plurality of types of external expansion devices can be connected, various external expansion devices can be connected by simply selecting and connecting the external expansion device having the required function from the external expansion devices of various functions. Functions can be realized, and various functions can be realized by combining the functions. That is, by preparing a plurality of types of external expansion devices having a single function and combining and using the necessary functions, it is possible to prevent unnecessary expansion of the functions.
Moreover, various combinations are possible.

According to the fifth aspect of the present invention, since the transmission signal from the transmission processing device to the signal line is transmitted by the start-stop synchronization, other devices widely used by the start-stop synchronization only by performing signal conversion at the physical level. Can be connected to. That is, in the case where a computer device is connected to the signal line as an external expansion device, physical level conversion is performed on an interface of various standards such as RS232C, RS485, RS422 provided in the computer device, and the connection is performed. At the same time, at the data link level, the connection becomes easier by adopting the start-stop synchronization method that can be controlled more easily than the synchronization method.

[0018]

【Example】

(Embodiment 1) The basic configuration of the remote monitoring control system is the same as the conventional configuration shown in FIG. 8, and as shown in FIG. 1, the transmission processing device 1 has a function for enabling connection with an external system. The external expansion device 11 having the external expansion device 11 is connected to the signal line Ls, and the external expansion device 12 for controlling the load L connected to the control terminal 3 according to the time schedule, and the operation at the time of a power failure such as a fire occurrence The external expansion device 13 having a function of restoring the states of the control terminal device 2 and the control terminal device 3 is connected. The external expansion device 11 is connected to an expansion connection section provided in the transmission processing device 1 separately from the signal line Ls. In addition, the transmission processing device 1 includes external expansion devices 11 to 13.
A transmission control unit (not shown) for transmitting data between the external expansion devices 11 to 1 is provided in the transmission control unit.
In response to an instruction from 3, the operation terminal 2 and the control terminal 3
Data transmitted to the transmission processing devices 11 to 13 for controlling the transmission signal to the control terminal device 2 and the data returned from the operation terminal device 2 or the control terminal device 3.
Return to. Here, the transmission control unit can exchange data with a plurality of types of external expansion devices 11 to 13. That is, a plurality of types of external expansion devices 11 to 13
Is identified by identification data, and each external expansion device 11-1
3 from the external expansion device 1 for normal transmission processing between the operation terminal 2 and the control terminal 3.
The instructions 1 to 13 are preferentially executed. Such normal transmission processing and processing as the extended control unit are realized by a microcomputer built in the transmission processing device 1 and controlled by a program as appropriate.

In the system configuration shown in FIG. 1, an operation terminal 2 having a pattern switch Sp and an operation terminal 2 having a group switch Sg are also provided.
The switch S has a one-to-one correspondence with the switch S and the load L so as to individually control each load L by operation, and the pattern switch Sp and the group switch Sg collectively control a plurality of loads L. The loads L are associated with the pattern switches Sp or the group switches Sg one to one. The pattern switch Sp collectively controls a plurality of loads L so that the loads L are individually set in advance, and the group switch Sg collectively controls a plurality of loads L to the same state.

External expansion device 12 connected to the signal line Ls
As an example, the external expansion devices 11 to 13 will be described in more detail. As shown in FIG. 2, the transmission processing device 1 includes a basic processing unit 21 that performs normal transmission processing and a basic processing unit 2
1, a transmission control unit 22 for transmitting the data transmitted / received in 1 by a predetermined protocol of a time division multiplex transmission system, and a signal line L.
and a transmission / reception circuit 23 that performs signal conversion at a physical level for connecting to s. Further, although not shown, an expansion control unit for exchanging data with the external expansion devices 11 to 13 is also provided. The basic processing unit 21, the transmission control unit 22, and the expansion control unit are configured by a microcomputer that operates according to a program as appropriate. Here, the transmission / reception circuit 23 sends out a pulse-width-modulated voltage-mode transmission signal and receives a current-mode return signal.

On the other hand, the external expansion device 12 includes the basic processing unit 2
1, an extension processing unit 31 that realizes an extension function, a transmission control unit 32 that controls a transmission procedure so that data can be exchanged by a predetermined protocol, an operation terminal 2 or a control terminal 3 In the same manner as above, a transmission / reception circuit 33 having an address and connected to the signal line Ls is formed. Therefore, when an instruction is given from the external expansion device 12 to the transmission processing device 1, the transmission / reception circuit 33 generates an interrupt signal Vi to the transmission processing device 1 in the same manner as the operation terminal 2, and then the expansion processing is performed. The data generated by the unit 31 is returned to the transmission processing device 1. Transmission processing device 1
Then, when the data is received, it is known from the address that the data is from the external expansion device 12, so the data is processed separately from the data from the operation terminal 2 and the control terminal 3. That is, the data from the external expansion device 12 is input to the expansion control unit and is processed with priority over the data from the operation terminal device 2 and the control terminal device 3. For example, if the expansion processing unit 31 of the external expansion device 12 is set to have a function of turning on a specific load L at a specific time, when the time measured by the expansion processing unit 31 reaches the specific time, By instructing the transmission processing device 1 to turn on the load L, the instructed load L is turned on regardless of the operation of the switch S or the like.
When the load L is turned on, the operation confirmation return signal is returned to the transmission processing device 1. Therefore, if this return signal is returned to the external expansion device 12, the target load L is returned to the external expansion device 12. It is possible to recognize whether or not it is turned on.

External expansion devices 11 to 13 and transmission processing device 1
3 to 6 specifically show a procedure of transmitting data between the data and
become that way. FIG. 3 shows a case where a plurality of loads L are collectively pattern-controlled according to a time schedule. That is, at a specific time, the pattern switch S
This operation realizes the same operation as when p is operated. First, when the external expansion device 12 issues a pattern control instruction to the transmission processing device 1, the transmission processing device 1 loads the load L to be collectively controlled. After transmitting the transmission signal to the connected control terminals 3, the control terminals 3 are controlled in accordance with the control of the load L.
Receives the monitoring data returned from for confirmation of operation. When receiving the monitoring data, a transmission signal is transmitted to the operation terminal 2 having the switch S corresponding to each load L so as to display the operation state of the load L, and the operation terminal having the pattern switch Sp is also provided. Notify that pattern control is also performed on No. 2. When the above process is completed,
Since the pattern control by the external expansion device 12 is completed,
The external expansion device 12 is notified of the end of the pattern control.

FIG. 4 shows a transmission procedure of the external expansion device in which the priority of operation of each switch S is set. That is, this external expansion device is provided with a specific operation terminal device 2 (SW in FIG. 4).
The control terminal 3 (T / U in FIG. 4) is connected to a specific load L by operating a switch S (shown as 1-1).
(Shown as 1-1) is controlled so as to invalidate the operation of the switch S of the operation terminal 2 (SW1-2) having a low priority. First, when the switch S is operated, the transmission processing device 1 notifies the external expansion device of the operation of the switch S, and the external expansion device performs transmission processing of load control permission / non-permission according to the priority of the switch S. Notify the device 1. If permitted here, the transmission processing device 1 transmits a transmission signal to the control terminal device 3 corresponding to the address according to a normal transmission procedure, controls the load L, and receives the control state of the load L. In addition, the control state of the load L is returned to the operation terminal device 2 that operates the switch S to display the operation. Since the individual control of the load L is completed by the processing so far, the transmission processing device 1 notifies the external expansion device of the end of the individual control. In this state, when the switch S having a lower priority is operated, the transmission processing device 1 notifies the external expansion device that the switch S has been operated, but the load control is not permitted and the load L is controlled. Is not done. As described above, it becomes possible to set the priority of each switch S and control the load L.

FIG. 5 shows a case where the load L such as a lighting load is pattern-controlled only when it is required in accordance with the occurrence of a fire. In this case, it is necessary to interlock with a fire alarm system which is an external system. Therefore, the external expansion device 11 connected to the transmission processing device 1 is used. That is,
When a fire occurs, each switch S from the external expansion device 11
The external expansion device 11 receives the current control state of the load L from the transmission processing device 1 for recovery later. next,
The external expansion device 11 instructs the transmission processing device 1 which load L is in which control state. After that, the transmission processing device 1 controls each load L by a normal transmission procedure, receives the operating state of the load L from the control terminal device 3, and displays the operating state of the load L on each operating terminal device 2. Let By the above processing, the load L can be controlled in a predetermined pattern corresponding to the fire occurrence. When the pattern control is completed, the external expansion device 11 is notified to that effect.

In order to restore the load L after controlling the load L in the pattern corresponding to the fire occurrence as described above, as shown in FIG. 6, the source of the load L received by the external expansion device 11 in association with the fire occurrence. The control state of 1 is transmitted to the transmission processing device 1.
The transmission processing device 1 controls each load L according to an instruction from the external expansion device 11, receives an operating state of the load L from the control terminal device 3, and further includes a switch S corresponding to each load L for operation. The operation state of the load L is displayed on the terminal device 2. When this series of processing is completed, the transmission processing apparatus 1 notifies the external expansion apparatus 11 of the processing completion. When the external expansion device 11 is notified of the end of the recovery process, the external expansion device 11 gives an instruction to the transmission processing device 1 to permit the operation by each switch S.

(Embodiment 2) In this embodiment, as shown in FIG. 7, an external expansion device 14 is provided for enabling the signal line Ls to be relayed with an external system. It has the same configuration as that of the first example. The difference from the first embodiment is that the transmission signal is not the pulse width modulation but the baseband double current system, and the synchronization control system is not the synchronous system but the start-stop synchronization system. Therefore, in the external system RS232C, RS485, RS422
If such standards are adopted, the external extension device 14 converts the voltage mode signal transmitted through the two-wire type signal line Ls into a transmission signal to the external system, and converts the reception signal from the external system into a current. Data can be transmitted between the external system and the transmission processing apparatus 1 without changing the waveform only by converting into a mode signal. Further, since the interface of the standard as described above is generally adopted in the computer device, and the computer device often adopts the asynchronous interface, the transmission processing device 11, the operation terminal 2 and the control device are used. By performing the asynchronous transmission control with the terminal device 3, the connection with the external system becomes easier. here,
Since the transmission signal is a double-current system, the operation terminal 2 and the control terminal 3 can be supplied with power by rectifying the transmission signal as in the first embodiment.

In this embodiment, since the start-stop synchronization type transmission control is carried out as the transmission signal, the signal line can be easily extended by inserting the repeater into the signal line and repeating the reproduction. By using a general-purpose integrated circuit for start-stop synchronization, the cost can be reduced as a whole. In particular, many commercially available computer devices are equipped with this type of interface, so that they can be easily used. Furthermore, if two external expansion devices 14 are connected to the signal line Ls as shown in FIG. 7, data can be exchanged between the external expansion devices 14 through the signal line Ls and the transmission processing device 1. Data can be transmitted between the two external systems through the signal line Ls. In this case, RS232
In the standards such as C, RS485, and RS422, three lines are required for transmission and reception, but the data transmitted through the signal line Ls uses the voltage mode signal for transmission from the transmission processing device 1 and the current mode signal for reception. The transmission and reception can be performed by two lines, and the transmission line between the external systems can be a two-line type transmission line. Other configurations and operations are the same as those of the first embodiment.

[0028]

According to the first aspect of the present invention, the transmission processing device is provided with the expansion controller, and the transmission processing device controls the transmission with the terminal device in response to an instruction from the external expansion device provided separately from the transmission processing device. However, since the control result is returned to the external expansion device, if the external expansion device is connected to the transmission processing device, the control of the terminal device can be managed in time, the control status of the terminal device can be transmitted to the external system, There is an effect that various functions such as recording the control state of the terminal device or giving an instruction for restoration to an abnormality such as a power failure can be realized by the external expansion device. That is, the expandability of the remote monitoring and control system is enhanced, and the functions of the remote monitoring and control system can be flexibly selected. As a result, even if the existing remote monitoring and control system is used, work for adding an external expansion device is required. It has the advantage that the function can be expanded only by itself and the construction work becomes easy.

According to the second aspect of the present invention, since the transmission processing device is provided with the expansion connection unit and the external expansion device is connected to the expansion connection unit, the external expansion device is connected without affecting the data transmission with the terminal device. There is an advantage that communication becomes possible. According to the invention of claim 3, the external extension device is connected to the signal line together with the terminal device, and the extension control unit provided in the transmission processing device separates the transmission signal to and from the terminal device from the instruction from the external extension device. The advantage is that the function can be expanded by a simple construction in which an external expansion device is connected to the signal line in the existing remote monitoring and control system.

According to the fourth aspect of the present invention, a plurality of types of external expansion devices can be connected. Therefore, by selecting an external expansion device having a required function from the external expansion devices having various functions and connecting the external expansion devices, various kinds of external expansion devices can be connected. There is an effect that the functions can be realized, and various functions can be realized by combining the functions. That is, by preparing a plurality of types of external expansion devices having a single function and combining and using necessary functions, it is possible to perform various combinations without expanding unnecessary functions. Has the advantage.

According to the fifth aspect of the present invention, since the transmission signal from the transmission processing device to the signal line is transmitted by start-stop synchronization, another device that is widely used by start-stop synchronization only needs to perform signal conversion at the physical level. The effect is that it can be connected to. That is, when a computer device is connected to the signal line as an external expansion device, RS232C, RS485, RS provided in the computer device are provided.
The advantage is that connection is facilitated by converting the interface of various standards such as 422 by connecting at the physical level and connecting at the data link level, and by adopting an asynchronous method that can be controlled more easily than the synchronous method. Have.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment.

FIG. 2 is a block diagram of a main part of the first embodiment.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is an operation explanatory diagram of the first embodiment.

FIG. 5 is an operation explanatory diagram of the first embodiment.

FIG. 6 is an operation explanatory diagram of the first embodiment.

FIG. 7 is a schematic configuration diagram of a second embodiment.

FIG. 8 is a schematic configuration diagram of a remote monitoring control system.

FIG. 9 is an operation explanatory view showing a transmission signal of the remote monitoring control system.

[Explanation of symbols]

 1 transmission processing device 2 operation terminal device 3 control terminal device 11 external expansion device 12 external expansion device 13 external expansion device 14 external expansion device L load Ls signal line S switch Sp pattern switch Sg group switch

Claims (5)

[Claims] 1. A plurality of terminals each having an address separately are branched and connected to a transmission processing device through a two-wire signal line,
The transmission processing device individually accesses the terminals by sending a transmission signal including address data to the signal line in a time division multiplex transmission method, and operates from the terminal during the signal return period set in synchronization with the transmission signal. When the data is received, the control data is generated based on the operation data, and the control data is transmitted to the terminal device that generated the operation data and the control data is transmitted to the other terminal device in which the correspondence by the address is preset. In the remote monitoring and control system that controls the connected load, control the transmission with the terminal device by the instruction from the external expansion device provided separately from the transmission processing device to the transmission processing device, and the control result of the terminal device by the transmission processing device. A remote supervisory control system, wherein an extension control unit for returning the data to an external extension device is provided in the transmission processing device. 2. The remote supervisory control system according to claim 1, wherein the transmission processing device comprises an expansion connection unit for connecting the external expansion device to the expansion control unit. 3. The external expansion device is connected to the signal line together with the terminal device, and the expansion control unit processes the instruction from the external expansion device separately from the data from the terminal device. Remote monitoring control system. 4. The remote monitoring control system according to claim 1, wherein the expansion control unit is connectable to a plurality of types of external expansion devices. 5. The remote monitoring and control system according to claim 1, wherein the transmission processing device transmits the transmission signal to the signal line in asynchronous mode.