JPH01212200A - Terminal device for power line carrier system - Google Patents

Abstract

PURPOSE:To simplify work at the time of system rise and to make polling unnecessary at the time of system working by operating a terminal device itself so as to obtain the synchronization of the system at the time of power-on resetting. CONSTITUTION:A means is provided which can selectively set the terminal device of a power line carrier system at a control terminal device 2CT for a load control and to a terminal device 2IN for a control requiring input. At the time of the power-on resetting, the control terminal device 2CT communicates the condition of the input of itself to a corresponding input terminal device 2IN, on the other hand, the input terminal device 2IN adds a function to require the communication of the input condition of the control terminal device 2CT to the corresponding control terminal device 2CT. Thus, the work at the time of system rise is simplified, and the polling at the time of the system working is made unnecessary.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a terminal device for a power line carrier system, in particular, to a terminal device for a power line carrier system, in particular, to superimpose a control signal wave on a commercial power supply frequency and send it to an indoor power line, and to transmit the carried control signal wave to an indoor power line. This invention relates to a terminal device for a power line carrier system that receives signals and controls loads connected to the indoor power line.

[Conventional technology]

The third image is a block circuit diagram showing the configuration of an example of a conventional power line transport system to which a remote control device disclosed in Japanese Patent Publication No. 60-31307 is applied.

In the figure, 1 is a master unit that manages the system by synchronizing the entire system, and 2 is a master unit that receives control signals from the master unit 1 and controls each connected load device 3 according to that information. The terminals 2a, 2b, 2c, --= each have a monitoring input terminal and a function of reporting the control status. 3 is each load device controlled by each terminal device 2; 4 is each control input switch to each terminal device; 5 is:
A power line for transmitting signals.

The operation of the above configuration will be explained below.

First, the case where each load device 3 is controlled from the master device 1 will be explained. Each terminal device 2 has a different address, and when the address information in the control signal transmitted from the base device 1 onto the power line 5 matches the address previously assigned to itself, it stops receiving the control signal. and controls each load device 3 to be controlled according to the content of the control information in the control signal.

Next, a case will be described in which another terminal device is controlled from the control input switch 4 attached to the monitoring input terminal of the terminal device 2b.

The control input switch 4 of the terminal device 2b is connected to a monitoring input terminal, and transmits its on or off state as a monitoring signal to the base unit 1 via the power line 5. On the other hand, in the main device 1, by setting the address of the terminal device 2b to which the control input switch 4 is attached in advance using a switch, etc., only the required monitoring information is transmitted from the monitoring signal transmitted from the terminal device 2b. According to the program of the correspondence and dependency relationship between each control input switch 4 and each terminal device 2 set in advance,
The content of the control signal is determined, and the control signal is sent onto the power line 5 to each terminal device 2. After that, each predetermined load device 3 is controlled from each control input switch 4 in the same procedure as the method for controlling each load device 3 of the base unit 1 described above.

[Problem to be solved by the invention]

Now, when installing such a system and starting M(*, the master device 1 normally communicates with each terminal device 2 individually in order to understand the current status and control status of the control terminal device and input terminal device connections. The investigation is carried out by communicating (this is called "polling").However, for this purpose, all the devices that make up the system must be powered on in the specified order, and the system startup work is not complete. In addition, especially in power line transportation systems, in order to improve the degree of freedom in system installation, it is common for each terminal device to be fixed simply by inserting it into a power outlet.

For this reason, there is a possibility that terminal devices can be easily attached to and detached from the system even after installation, so in order to understand the connection status of each terminal device, it is necessary for the base device to periodically perform the above polling. . However, in power line carrier communication,
- Due to the numerically low reliability of the transmission line, the transmission speed is kept low, and the frequent polling of the base unit to quickly detect the attachment and detachment of terminal devices unnecessarily increases the amount of traffic on the transmission line. This caused problems such as deterioration of system responsiveness.

This invention was made in order to solve the problems of the conventional methods as described above, and provides a power line transport system that simplifies the work at system startup and eliminates the need for polling during system operation. The purpose is to provide

[Means to solve the problem]

Therefore, in the present invention, means is provided for selectively setting the terminal device of the power line transport system as a control terminal device for load control and an input terminal device for inputting control requests, and at the time of power-on reset, The control terminal reports the state of its own input to the corresponding input terminal, and the input terminal requests the corresponding control terminal to report the input state of the control terminal. The above object is attempted to be achieved by configuring the device to have additional functions.

[Effect]

In the terminal device of the present invention configured as described above, the terminal device itself operates to synchronize the system at the time of power-on reset, which simplifies the above-mentioned work at system start-up, and also simplifies the system startup process. polling is no longer necessary.

(Example) Hereinafter, this invention will be explained based on examples.

1 and 2 are block circuit diagrams showing respective examples of a control terminal 2CT and an input terminal 2.8 according to the present invention, and are the same (equivalent) as the conventional example shown in FIG. 3. Components are represented by the same symbols.

(Configuration) In Figure 1.2, 6 indicates each terminal, and the control terminal 2.
cT or a selection switch for selecting the input terminal 21N, 7 is a power control circuit for controlling the power supply to the load equipment 3, 8 is a selection switch for selecting the control state of the load equipment 3 to be controlled to the input terminal 21N. This is a display device for remote monitoring.

(Operation) Next, an overview of the operation in the above configuration will be explained based on the drawings. In FIG. 3 showing the conventional example, in this embodiment, the terminals 2a, 2 are selected by the selection switches 6, respectively.
c is the control terminal 2CT, and the terminal 2b is the control terminal 2
It is assumed that the input terminal 21N corresponding to a is set.

1) At system start-up - When the input terminal 2b is powered on after the control terminal 2a is powered on.

The input terminal device 2b transmits a message on the power line 5 requesting the state of the input terminal to the corresponding control terminal device 2a.

The control terminal 2a receives this message, reads the status of the monitoring input, and reports the status of the monitoring input terminal to the control terminal 2a. In the control terminal 2a, the control state of the load device 3 is input to the monitoring input terminal, so reporting the state of the monitoring input terminal is equivalent to reporting the control state of the load to the input terminal 2b. . The input terminal device 2b receives this notification, extracts the status of the load device 3 from the contents of the message, and outputs it to the display 8 to monitor the load device 3.

(2) When the control terminal 2a is also powered on after the input terminal 2b is powered on.

The control terminal device 2a transmits a message on the power line 5 informing the corresponding input terminal device 2b of the state of its own input terminal. The input terminal device 2b receives this notification, extracts the status of the load device 3 from the contents of the message, and outputs it to the display 8 to monitor the load device 3.

2) At system N tide, the control states can be synchronized using the same procedure as above.

(Effects of the Invention) As described above, in the power line transport system configuration according to the present invention, it is possible to synchronize the control states of the input terminal device and the control terminal device without the intervention of a master device. Further, there is no problem in any order in which the system component devices are power-on reset. In the system of this invention, the base unit only needs to poll the control terminal in order to grasp the control status of the system at the time of power-on reset, and when the system is in operation, the base unit only needs to poll the control terminal to understand the control status of the system. If you monitor it, there is no need for polling. That is, according to the terminal device according to the present invention, the terminal device itself operates to synchronize the system at the time of power-on reset, which simplifies the above-mentioned work at system startup and eliminates polling when the system is operating. It can be made unnecessary.

[Brief explanation of the drawing]

FIG. 1 is a configuration block circuit diagram of an example of a control terminal according to the present invention, FIG. 2 is a configuration block circuit diagram of an example of the above input terminal, and FIG. 3 is an example of a conventional power line conveyance system. FIG. 3 is a configuration block circuit diagram. In each figure, 1 is a master unit, 2 CT/21N are respective control/input terminals, 3 is a load device, 4 is a control input switch, 5 is a power line, and 6 is a control terminal/input terminal. 7 is a selection switch, and 7 is a power control circuit. In each figure, the same reference numerals indicate the same or equivalent components.

Claims (1)

[Claims] In a terminal device of a power line carrier system that superimposes a control signal wave on a commercial power supply frequency and sends it to an indoor power line, receives the carried control signal wave and controls a load connected to the indoor power line, the terminal device is equipped with at least one pair of output and input terminals, and uses the output terminal to control the load and the input terminal to input a controlled state of the load, and a control terminal for controlling the load. The terminal device is equipped with an input terminal device for remotely inputting a control request for a load connected to the control terminal device as a pair, and a selection means that can be externally set to two types, and at the time of power-on reset,
The control terminal has a function of reporting the state of its own input to the corresponding input terminal, and the input terminal requests the corresponding control terminal to report the input state of the control terminal. A terminal device for a power line transport system, characterized in that it is configured to have the following.