JPH03183232A - Repeating installation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to the case where there is an abnormality in the signal transmission line, central processing unit, terminal device, or power supply device when centrally controlling multiple terminal devices, resulting in loss of control. This invention relates to a relay device that limits an uncontrollable area in the event of an accident.

[Conventional technology]

Conventionally, a data transmission relay system has been disclosed, for example, in Japanese Patent Application Laid-Open No. 158153/1983.

In the case of this publication, a polling method with a multi-drop configuration in which multiple controlled stations are monitored and controlled from a control station is used.
Each controlled station normally performs relaying, and if its own station is in trouble, it is bypassed and disconnected from the line, and the uplink signal level or downlink signal level generated in the top five and lower controlled stations adjacent to the failed controlled station is detecting a decrease in signal level, compensating the level by detecting this decrease in signal level, and
This system inserts faulty station information into the uplink signal, compensates for the reception levels of the control station and a plurality of controlled stations, and allows the control station to quickly detect a faulty station.

In addition, regarding the centralized control device of terminals,
6951, Japanese Patent Publication No. 61-49863 regarding a transmission line short circuit protection device, and Japanese Patent Publication No. 63-29865 regarding a short circuit detection method for a time division multiplex transmission system.
They are disclosed in the respective publications.

On the other hand, FIG. 1 is a block diagram showing the overall configuration of a centralized control system having a relay device of the present invention, which will be described later.
The configuration on the block diagram has the same precept as the conventional example, and FIG. 1 will be referred to in explaining the conventional technology.

In this figure, 1 is a central processing unit that controls the terminals 23 to 2f, and 3 is a relay device that connects the transmission line 5a on the central processing unit l side and the transmission line A5b on the terminal side 2a to 2f. . The power supply device 4a is connected to the transmission line 5a, and the terminal device 2
3 to 2C, and the power supply device 4b is connected to the transmission 15b, and supplies power to the terminals $12d to 2f.

FIG. 7 is a block diagram showing the configuration of a conventional example of the relay device 3, where lla is the transmission line 5a of the central processing unit 1t11.
A receiving circuit 12a receives a transmission signal from the transmission line 5.
llb is a receiving circuit that receives transmission signals from the terminals 2a to 2' transmission 15b, 12b;
10 is a transmitting circuit that transmits data to the transmission line 5b, and 10 is a control circuit that controls the receiving circuit 12a12b and the transmitting circuits tta and llb.

Next, the operation will be explained. Taking an air conditioning system as an example, such a centralized control system includes terminals 2a to 2.
f is an indoor unit control device that controls the indoor unit according to operation commands from a local remote control (remote controller) and transmits data such as thermo on/off to the outdoor unit control device; an outdoor unit control device that controls the outdoor unit; It consists of a local remote control and is supplied with power from power supply devices 4a and 4b.

The relay device 3 is used to amplify the signal when the signal is attenuated and normal transmission cannot be performed, such as when the transmission distance becomes long or the number of terminals increases.

Further, the central processing unit 1 is installed in a manager's room, etc., and forcibly starts and stops the air conditioner according to a schedule, and allows or prohibits manual operation.

In the hand-prohibited state, the local remote controller cannot be operated, but in the hand-permitted state, the user can operate the local remote controller to issue operation commands to the indoor unit control device, so the user can freely start and stop the indoor unit.

Next, the transmission procedure will be explained. When the central processing unit 1 transmits to the terminal 112d, an index number indicating the terminal 2d is added to the data that the central processing unit 1 wants to send, and the data is transmitted in a transmission data format (not shown) at A5a.

The receiving circuit 12a of the relay device 3 receives the received data from the transmission A5a and transmits it to the control circuit 10.

The control circuit 10 directly transmits the received data to the transmission circuit 11b, and transmits it to the transmission line 5b. The terminals 2a to 2c receive direct transmission data from the central processing unit 1 to the terminals 112d to 2.
r receives the transmission data relayed by the relay device 3, respectively.

The terminal device 2d whose index number of the transmitted data matches its own index number takes in this transmitted data, and the transmission and reception are completed.

In this way, conventional relay devices are designed to guarantee signal attenuation when the transmission distance is long or when there are many terminals, and the function is to amplify the received signal as it is without modifying it. And it wasn't there.

[Problem to be solved by the invention]

Since the conventional relay device is configured as described above, it is possible to prevent transmission from the central processing unit 1 or the terminals ill'l a to 2c, short-circuit abnormality in the receiving circuit, short-circuit or open circuit of the transmission line 5a on the central processing unit l side. As a result, transmission between the central processing unit 1 and the terminals 2d to 2f is interrupted.

Also, if the power supply bag @ 4 a becomes unable to supply power,
Terminals 2a to 2C and terminals 2d to 2 that can no longer receive power
Transmission with f is interrupted.

Conversely, due to a short-circuit abnormality in the transmitting or receiving circuit of the terminals 2d-2f, or a short-circuit or open circuit of the transmission 15b on the terminal side, the transmission between the terminals 2d-2f and the central processing unit is interrupted.

Furthermore, if the power supply device 4b becomes unable to supply power, transmission between the terminals 1!2d to 2f, which are no longer able to receive power, and the central processing unit is interrupted.

For example, assume that the terminal 2a is the indoor unit controller and the terminal 2d is the outdoor unit controller, the indoor unit is thermo-on and the outdoor unit compressor is operating, and an abnormality has occurred on the central processing unit l side. In this case, the indoor unit control device goes down, so the refrigerant flow rate control device (not shown) is shut off, and the refrigerant stops flowing. At this time, if the compressor is not stopped immediately, the discharge pressure will rise and an abnormal state will occur.

In other words, it is necessary to perform transmissions to constantly check the communication partner, which increases the transmission line occupancy rate, requires a reduction in the amount of data to be transmitted, complicates the terminal equipment, and increases the communication interval. For example, there were problems such as a delay in detection.

Conversely, the same applies when an abnormality occurs on the terminal side, assuming that the terminal 2a is an outdoor unit control device and the terminal 2d is an indoor unit control device.

Next, the central processing unit 1 is a terminal device 2f which is a local remote controller.
On the other hand, if the user is operating the terminal device 2d, which is the outdoor unit control device, and the terminal device 2e, which is the indoor unit control device, with the hand-prohibited operation, if an abnormality occurs on the central processing unit side, the user can There was nothing I could do and I had to wait for the service person to arrive.

Furthermore, if an error occurs on the terminal side, the central processing unit l will treat it as an individual error on the terminals 2d to 2f, not on the terminal side, so the cause will not be known during service.
There was also the problem that recovery took time.

This invention was made in order to solve the above-mentioned problems. It is an object of the present invention to provide a relay device that can immediately detect a signal without causing congestion on a transmission line, and can continue operating a terminal on a terminal side even in the event of an abnormality on the central processing unit side.

[Means to solve the problem]

The relay device according to the present invention is installed in a relay circuit that regenerates and relays a signal received from one of a plurality of transmission paths to another transmission path, and is configured to reduce the DC voltage of the transmission line on the central processing unit side of a centralized control system. A detection means for detecting DC voltage or DC overcurrent in at least one of the transmission lines on the terminal side, and when the value detected by this detection means is not a specified value, A control circuit for identifying the occurrence of an abnormality in at least one of them is provided.

[For production]

The relay device according to the present invention is capable of detecting short-circuit abnormalities in the transmitting circuit or receiving circuit of the central processing unit or the terminal,
The state of the transmission line is detected by the detection means, such as a short circuit or open circuit of the transmission line on the tIF side, or an abnormality in the power supply device on the central processing unit side.The control circuit identifies the state of the transmission line based on the detection output, and the control circuit detects an abnormality on the terminal side. If detected, the occurrence of an abnormality is communicated to the central processing unit, and if there is an abnormality on the central processing unit side, the terminal side is controlled by a control circuit instead of the central processing unit.

〔Example〕

Hereinafter, an embodiment of the relay device of the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a centralized control system including the intermediate device of the present invention, and as described above, the feature of the present invention is shown in the relay device 3 in FIG. FIG. 2 is a block diagram showing the configuration of a first embodiment of this relay device 3.

In this FIG. 2, numerals 5a, 5b, 10 to 12b are the same parts as the conventional relay device shown in FIG.
A is a first voltage detection circuit as a detection means that detects the DC voltage of the transmission line 5a on the side of the central processing unit l newly added as shown in FIG. 2, and outputs the detection signal to the control circuit 10. .

The operation of relaying the signal on the transmission line 5a on the central processing unit l side to the transmission line 5b on the terminal side, and conversely the signal on the transmission line 5b on the terminal side to the central processing unit 1 side, is exactly the same as the conventional one.

Next, the operation will be explained. During normal operation, the first voltage detection circuit 13a of the relay device 3 detects the voltage that is supplied from the power supply device 4a and dropped due to the resistance of the transmission A5a.

The detection signal detected by this first voltage detection circuit 13a is
The signal is output to the control circuit 10, and the control circuit IO can detect whether the voltage of the transmission line 5a is normal, that is, whether the transmission line 5a is normal.

Next, if the transmitting circuit 11a or receiving circuit 12a (not shown) of the central processing unit 1 or the terminals 2a to 2C becomes short-circuited, or the transmission line 5a between the power supply device 4a and the relay device W3 is short-circuited. Or if it becomes open, or if the power supply device 4a becomes unable to supply power,
The first voltage detection circuit 13a detects a significant voltage drop,
An abnormality is detected.

FIG. 3 is a block diagram showing the configuration of a second embodiment of the invention, in which a storage circuit 14 is added to the configuration of FIG.

The memory circuit 14 stores the response method when the relay device W3 detects an abnormality in one example of the central processing unit set by the central processing unit l, and also stores the response method when the relay device W3 detects an abnormality in one example of the central processing unit.
It stores the control details for f.

Next, the operation will be explained. When the central processing unit 1 is started up, the central processing unit 1 informs the relay device 3 that if the relay device 3 detects an abnormality in one example of the central processing unit, it either stops the terminals 2d to 2f on the terminal side or the central processing unit 1 Sends whether to continue the controlled state or operate in special mode. When operating in a special mode, a signal is sent to set the operation details. Relay device 3 receives this signal and stores it in storage device 14 .

When it is set to continue the abnormal control state on the central processing unit 1 side, the latest control contents from the central processing unit 1 during normal operation are stored in the storage device 14.

When an abnormality occurs on the central processing unit side, if it is set to stop operation, a stop command is sent to the terminals 2d to 2f.

If the central processing unit 1 is set to continue controlling, the latest control contents from the central processing unit 1 stored in the storage circuit 14 are transmitted to the terminals 2d to 2f.

If it is set to operate in a special mode, the mode command stored in the memory circuit 14 is sent to the terminals 2d to 2.
Send to f.

Next, a third embodiment of the present invention will be described with reference to FIG. This figure 4 shows the second voltage detection circuit 13b that detects the DC voltage of the transmission A5b on the terminal side in accordance with the I command of figure 2.
is added.

When the transmitting circuit or receiving circuit (not shown) of the terminals 2d to 2' becomes short-circuited, or when the transmission 1i15b between the power supply device 4b and the relay device W3 becomes short-circuited or open, or when the power supply device 4b When an abnormality occurs in which power cannot be supplied, the second voltage detection circuit 13b detects the abnormality.

Next, a fourth embodiment of the present invention will be described with reference to FIG. When the relay device 3 of FIG. 5 is used, the centralized control system becomes as shown in FIG. 6, and the power supply device 4b shown in FIG. N1? It is omitted in the I system.

Instead of using the power supply device 4b in this centralized VTM system, the relay device 3 in FIG. 6 has the configuration shown in FIG. 2 in addition to the structure shown in FIG. Power supply system? If4C is provided as shown in FIG. 5, and a power supply current detection circuit 15 is provided as an example of power supply means for detecting the power supply current of this power supply device 4c and outputting a detection output to the control circuit IO. There is. The other configurations are the same as in FIG. 2.

With this configuration, if the transmitting circuit or receiving circuit (not shown) of the terminals 24 to 2f becomes short-circuited, or if the transmission 15b of the terminals 2d to 2f is short-circuited, the power supply current can be detected. Overcurrent flows from circuit 4C,
The power supply current detection circuit 15 detects this abnormality. This detection output is sent to the illllll circuit lO, and the control circuit 10 identifies this abnormality.

In this way, when an abnormality on the terminal side is detected by the relay device 3, the program built in the control circuit 1110 and stored in the program storage circuit (not shown) causes the
An abnormality on the terminal side is transmitted to the central processing unit 1. The central processing unit ll displays an abnormality on the terminal side.

〔Effect of the invention〕

As described above, according to the present invention, at least one transmission path is directly connected to a relay device that regenerates and relays a signal received from one of a plurality of transmission paths to another transmission path! A detection means for detecting L voltage or overcurrent is provided, and when the value detected by this detection means is not a specified value, an abnormality in at least one of the central processing unit side and the terminal side of the central control system is detected in the relay device. The control circuit identifies this and notifies the central processing unit, and if there is an abnormality on the central processing unit, the control circuit controls the terminal instead, so the reception of the central processing unit or terminal is Immediately detects short-circuit abnormalities in circuits or transmission circuits, short-circuits or open circuits in transmission lines on the central processing unit side or terminal side, and abnormalities in power supply equipment on the central processing unit side or terminal side without congesting the transmission line. In addition, in the event of an abnormality on the central processing unit side, the terminal side can freely select whether to stop, continue, or operate the terminal in a special mode. Furthermore, since abnormalities on the terminal side can be detected by the central processing unit, prompt and reliable service can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram of a centralized @control system including a relay device according to an embodiment of the present invention, FIG. 2 is a block diagram of a middle device of the first embodiment of the relay device of the present invention, and FIGS. 5
The figures are block diagrams showing the configurations of second to fourth embodiments of the relay device of the present invention, FIG. 6 is a block diagram of a centralized control system to which the relay device of FIG. 5 is applied, and FIG. 7 is a block diagram of a conventional relay device. FIG. 1 is a block diagram of a centralized control system including devices. 1... Central processing unit, 2a to 2f... Terminal, 3.
...Relay device, 4a, 4b...Power supply device, 4c...
Power supply circuit, 5a, 5b... Transmission line, 1O... Control circuit, 11a, 1lb-... Receiving circuit, 12a, 12b-
...Transmission circuit, 13a...First voltage detection circuit, 13
b...Second voltage detection circuit, 15...Power supply current detection circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A power supply device that supplies DC power to at least one of the transmission line from the central processing unit side and the transmission line on the terminal side, and a plurality of terminal devices connected to each of the transmission lines and controlled by the central processing unit. and a relay device that interconnects the plurality of transmission lines and performs regenerative relaying by receiving a signal between each transmission line in a receiving circuit and transmitting the signal to the transmission line from the transmitting circuit, and this relay. a detection means provided in the device for detecting a DC voltage or a DC overcurrent in at least one of the transmission lines; a detection means provided in the relay device for controlling the receiving circuit and the transmitting circuit; When the detection result of the means is not a specified voltage or current, identifying the occurrence of an abnormality on the central processing unit side or the terminal side, and notifying the abnormality on the terminal side to the central processing unit side, and on the central processing unit side. and a control circuit that controls the terminal device in place of the central processing unit when an abnormality is detected in the relay device.