JPH0777378B2 - Relay device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is incapable of control due to an abnormality in a signal transmission line, a central processing unit, a terminal or a power supply unit when centrally controlling a plurality of terminals. The present invention relates to a relay device that limits an uncontrollable area against an accident.

[Conventional technology]

Conventional data transmission relay systems include, for example, Japanese Patent Laid-Open No.
It is disclosed by Japanese Patent Publication No. 59-158153.

In the case of this publication, by the polling method of the multi-drop configuration in which the controlled station monitors and controls a plurality of controlled stations,
Each controlled station normally relays, and when its own station is out of order, it is bypassed and disconnected from the line, and the upstream signal level or the downstream signal level generated in the upper or lower controlled station adjacent to this failed controlled station A signal level drop is detected and the level is compensated by detecting this signal level drop.
The fault station information is inserted in the upstream signal so that the reception levels of the control station and a plurality of controlled stations are constantly compensated so that the control station can promptly detect the fault station.

Regarding the centralized control device for terminals, see
Japanese Laid-Open Patent Publication No. 61-61 discloses a transmission line short-circuit protection device.
No. 49863 discloses a short-circuit detection method for a time division multiplex transmission system, which is disclosed in, for example, Japanese Patent Publication No. 29865/1988.

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 described later.
The configuration on the block diagram is the same as that of the conventional example, and will be described with reference to FIG. 1 when describing the conventional technique.

In FIG. 1, 1 is a central processing unit for controlling the terminals 2a to 2f, 3 is a relay device, and a transmission line 5a on the side of the central processing unit 1
And the transmission line 5b on the terminal side 2a to 2f. Power supply device
4a is connected to the transmission line 5a, the terminals 2a to 2c, and the power feeding device 4b is connected to the transmission line 5b to supply power to the terminals 2d to 2f.

FIG. 7 is a block diagram showing a configuration of a conventional example of the relay device 3, 11a is a receiving circuit for receiving a transmission signal from the transmission line 5a of the central processing unit 1, and 11b is a side of the terminals 2a to 2f. A receiving circuit for receiving a transmission signal from the transmission line 5b, 12b is a transmitting circuit for transmitting to the transmission line 5b, 10 is the receiving circuit 12a, 12b,
It is a control circuit that controls the transmission circuits 11a and 11b.

Next, the operation will be described. Such a centralized control system is, for example, in the air conditioning system, the terminals 2a to 2f.
Is an indoor unit control device that controls the indoor unit according to an operation command from a local remote controller (remote controller) and also 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 controller, and power is supplied from power supply devices 4a and 4b.

The relay device 3 is used to amplify the signal when the signal is attenuated and the normal transmission is not performed 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 or the like, and forcibly starts and stops the air conditioner according to a schedule or the like, and permits or prohibits hand operation.

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

Next, the transmission procedure will be described. When the central processing unit 1 transmits to the terminal 2d, the index number indicating the terminal 2d is added to the data which the central processing unit 1 wants to send, and the data is transmitted by the transmission line 5a in a transmission data format not shown.

The reception circuit 12a of the relay device 3 receives the reception data from the transmission line 5a and transmits it to the control circuit 10.

The control circuit 10 transmits the received data as it is to the transmission circuit 11b and transmits it to the transmission line 5b. The terminals 2a to 2c send the transmission data directly from the central processing unit 1, and the terminals 2d to 2f the relay device 3
Each of the transmission data relayed by is received.

A terminal whose index number in the transmitted data matches the index number of its own station
2d takes in this transmission data, and transmission / reception is completed.

In this way, the conventional relay device is for guaranteeing signal attenuation when the transmission distance becomes long or when the number of terminals is large, and the function of amplifying the received signal as it is without modifying it. Besides, it wasn't.

[Problems to be Solved by the Invention]

Since the conventional relay device is configured as described above, due to the short circuit abnormality of the transmission or reception circuit of the central processing unit 1 or the terminals 2a to 2c, the short circuit or the opening of the transmission line 5a of the central processing unit 1 side, Transmission between the central processing unit 1 side and the terminals 2d-2f is interrupted.

Further, if the power supply device 4a becomes unable to supply power, the transmission between the terminals 2a to 2c and the terminals 2d to 2f, which cannot be received, is interrupted.

On the contrary, short circuit abnormality of the transmission or reception circuit of the terminals 2d to 2f,
By shorting or opening the transmission line 5b on the terminal side, the terminal 2d
Transmission between ~ 2f and the central processing unit side is interrupted.

In addition, if the power supply device 4b cannot supply power, the transmission between the terminals 2d to 2f that cannot receive power and the central processing unit side is interrupted.

For example, assume that the terminal 2a is an indoor unit controller, the terminal 2d is an outdoor unit controller, the indoor unit is in a thermo-on state, the compressor of the outdoor unit is in operation, and an abnormality occurs on the central processing unit 1 side. Then, since the indoor unit control device goes down, the refrigerant flow rate control device (not shown) is shut off and the refrigerant does not flow. At this time, if you do not stop the compressor immediately,
The discharge pressure rises, causing an abnormal condition.

In other words, it is necessary to perform transmission for always checking the communication partner, the transmission line occupation rate increases, the required transmission data must be reduced, and the terminal becomes complicated, and the contact interval can be lengthened. In that case, there was a problem that the detection was delayed.

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

Next, the central processing unit 1 performs a hand prohibition operation with respect to the terminal 2f which is a remote controller, and the terminal 2 which is an outdoor unit controller.
d. If the terminal 2e, which is an indoor unit control device, was operating, if an abnormality occurred on the central processing unit side, the user could not do anything at hand and had to wait for the arrival of the serviceman. .

Furthermore, if an abnormality occurs on the terminal side, the central processing unit 1 will treat it as an individual abnormality of the terminals 2d to 2f, not on the terminal side, so that the cause at the time of service is unknown and it takes time to restore. There were also problems.

The present invention has been made in order to solve the above problems, and an abnormality of the central processing unit, or a short-circuit or open of the transmission layer on the side of the central processing unit and a short-circuit or open of the transmission line on the side of the terminal. It is an object of the present invention to obtain a relay device which can immediately detect the transmission line without being congested, and can continue the operation of the terminal device even when the central processing device side is abnormal.

[Means for Solving the Problems]

A relay device according to the present invention is a relay device provided between a central side transmission line connected to a central processing unit for controlling a plurality of terminals and a terminal side transmission line connected to a terminal, wherein the central side transmission line is First transmitting / receiving means for receiving a signal from the central processing unit via the terminal and transmitting it to the terminal, and second transmitting / receiving means for receiving a signal from the terminal via the terminal side transmission line and transmitting it to the central processing unit. And an energization detecting means for detecting an energization state of the central side transmission line or the terminal side transmission line, and an abnormality of the central processing unit side or the terminal side is judged based on the detection result of the energization detecting means. The control means for controlling the transmitting / receiving means and transmitting the abnormality to the terminal side or the central processing unit side.

In addition, the energization detection means for detecting the energization state of the central side transmission line or the terminal side transmission line, the storage means for pre-storing the control contents at the time of abnormality that may occur on the central processing unit side, and the detection result of the energization detection means When an abnormality on the side of the central processing unit is judged, the first unit is determined according to the control content stored in the storage unit.
Control means for controlling the transmitting / receiving means and transmitting the stored control contents to the terminal side.

Furthermore, the power supply means for supplying power to the transmission line on the terminal side, the power supply detection means for detecting the power supply of the power supply means, and the detection result of the power supply detection means determine the abnormality on the terminal side to control the second transmission / reception means. The central processing unit side is provided with control means for transmitting an abnormality on the terminal side.

[Work]

The relay device according to the present invention determines whether the central processing unit side or the terminal side is abnormal by the energization detecting unit that detects the energization state of the central side transmission line or the terminal side transmission line, and operates the first or second transmitting / receiving unit. Controls and transmits an abnormality to the terminal side or central processing unit side. Further, when an abnormality on the side of the central processing unit is judged based on the detection result of the energization detection unit, the first transmission / reception unit is operated according to the control content at the time of the abnormality which may be generated on the side of the central processing unit stored in the storage unit in advance. The stored control contents are transmitted to the terminal side. Furthermore, if the power supply detection means detects the power supply of the power supply means for supplying power to the terminal side transmission line and determines the abnormality on the terminal side, the second
It controls the transmitting / receiving means of the terminal to transmit the abnormality on the terminal side to the central processing unit side.

〔Example〕

Embodiments of the relay device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a centralized control system including a relay device according to the present invention. As described above, the configuration of the relay device 3 in FIG. Have, second
FIG. 3 is a block diagram showing the configuration of the first embodiment of the relay device 3.

In FIG. 2, reference numerals 5a, 5b, 10 to 12b are the same parts as those of the conventional relay device shown in FIG. 6, and 13a is a transmission line on the side of the central processing unit 1 newly added according to FIG. This is a first voltage detection circuit as detection means for detecting the DC voltage of 5a and outputting the detection signal to the control circuit 10.

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

Next, the operation will be described. In the normal state, the first voltage detection circuit 13a of the relay device 3 detects the voltage dropped due to the resistance of the transmission line 5a supplied from the power supply device 4a.

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

Next, when the transmitter circuit 11a (not shown) or the receiver circuit 12a of the central processing unit 1 or the terminals 2a to 2c has a short circuit abnormality, or the transmission line 5a between the power feeding device 4a and the relay device 3
Is short-circuited or opened, or when the power supply device 4a is in an abnormal state in which power cannot be supplied, the first voltage detection circuit 13a detects a large voltage drop and the abnormality is detected.

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

The memory circuit 14 stores a method of dealing with a case where the relay device 3 detects an abnormality on the side of the central processing unit 1 set by the central processing unit 1, and stores the control contents of the central processing unit 1 to the terminals 2d to 2f. I remember.

Next, the operation will be described. When the central processing unit 1 starts up, when the relay device 3 detects an abnormality on the side of the central processing device 1 with respect to the relay device 3, either the terminals 2d to 2f on the terminal side are stopped, or the central processing device 1 Send whether to continue the controlled state or operate in special mode. When operating in the special mode, a signal for setting the operation content is transmitted. The relay device 3 receives this signal and stores it in the storage device 14.

When it is set that the control state at the time of abnormality of the central processing unit 1 side is set, the latest control content from the central processing unit 1 during normal operation is stored in the storage device 14.

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

When it is set to continue the control of the central processing unit 1, the latest control content from the central processing unit 1 stored in the storage circuit 14 is transmitted to the terminals 2d to 2f.

When it is set to operate in the special mode, the mode command stored in the storage circuit 14 is transmitted to the terminals 2d to 2f.

Next, a third embodiment of the present invention will be described with reference to FIG. This FIG. 4 shows the transmission line on the terminal side in the configuration of FIG.
A second voltage detection circuit 13b for detecting the DC voltage of 5b is added.

When a transmitter circuit or a receiver circuit (not shown) of the terminals 2d to 2f has a short circuit abnormality, or the transmission line 5b between the power feeding device 4b and the relay device 3 is short circuited or opened, or the power feeding device 4b. If there is an abnormality that can not supply power,
An abnormality is detected by the second voltage detection circuit 13b.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The centralized control system using the relay device 3 of FIG. 5 is as shown in FIG. 6, and the power feeding device 4b shown in FIG. 1 is omitted in the centralized control system.

Instead of using the power supply device 4b in this central control system,
In the relay device 3 of FIG. 6, in addition to the configuration of FIG. 2, a power feeding device 4c for supplying DC power to the transmission line 5b on the terminals 2d to 2f side is provided as shown in FIG. In addition, a power supply current detection circuit 15 is provided as an example of power supply means that detects the power supply current of the power supply device 4c and outputs a detection output to the control circuit 10. Other configurations are the same as in FIG.

With such a configuration, when the transmitter circuit or the receiver circuit (not shown) of the terminals 2d to 2f has a short circuit abnormality, or when the transmission line 5b on the terminals 2d to 2f side is short-circuited, the power supply current is supplied. An overcurrent flows from the detection circuit 4c, and the feeding current detection circuit 15 detects this abnormality. This detection output is sent to the control circuit 10, 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 central processing of the abnormality on the terminal side is carried out by a program stored in the control circuit 10 and stored in a program storage circuit (not shown). Transmit to device 1. The central processing unit 1 displays the abnormality on the terminal side.

As described above, the relay device of the present invention includes 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 the central processing unit connected to each transmission line. A relay that performs regenerative relay by connecting a plurality of terminals controlled by a device and a plurality of transmission lines to each other, receiving signals between the transmission lines by a receiving circuit, and transmitting to the transmission lines by a transmitting circuit. A device and at least one DC voltage of each transmission line provided in the relay device,
Alternatively, the detecting means for detecting a DC overcurrent and the receiving circuit and the transmitting circuit provided in the relay device are controlled, and when the detection result of the detecting means is not the specified voltage or current, the central processing unit side or the terminal side is A control circuit is provided to identify the occurrence of an abnormality, notify the central processing unit of the abnormality on the terminal side, and when the central processing unit detects the abnormality, controls the terminal side instead of the central processing unit. It is a thing. Then, the state of the transmission line is detected by the detecting means for short circuit abnormality of the transmission circuit or reception circuit of the central processing unit or terminal, transmission line short circuit or open of the central processing unit side, and abnormality of the power supply device of the central processing unit side. If the control circuit detects an abnormality on the terminal side by the detection output, the control circuit notifies the central processing unit of the occurrence of the abnormality. It is controlled by a control circuit instead of the processing device. This enables transmission of short circuit abnormalities in the central processing unit or terminal reception circuit or transmission circuit, short-circuiting or opening of the central processing unit side or terminal side transmission line, and abnormalities in the central processing unit side or terminal side power supply device. The line can be detected immediately without being congested, and when the central processing unit side is abnormal, the terminal side operation can be freely selected from stop, continue, and special mode operation. Further, since the abnormality on the terminal side can be detected by the central processing unit, there is an effect that a quick and reliable service can be realized.

〔The invention's effect〕

As described above, according to the present invention, the energization detecting means for detecting the energization state of the central side transmission line or the terminal side transmission line is provided, and the abnormality is detected on the central processing unit side or the terminal side based on the detection result. The abnormality is transmitted to the terminal side or the central processing unit side via the first or second transmitting / receiving means. Also,
Storage means for storing in advance the control contents when an abnormality occurs is provided, and when the abnormality detection on the side of the central processing unit is detected by the energization detection means, the first transmission / reception means is controlled and stored by the storage contents of the storage means. The controlled contents are transmitted to the terminal side. Further, the power supply detecting means for detecting the power supply of the power supply means for supplying power to the terminal side transmission line determines the abnormality of the terminal side and transmits it to the central processing unit side. With such a configuration, even if an abnormality occurs on the central processing unit side or the terminal side, the transmission between the central processing unit and the terminal is not interrupted, for example, when the central processing unit side is abnormal, the operation of the terminal side is stopped, Continuation,
Control such as special mode operation can be performed.

[Brief description of drawings]

FIG. 1 is a block 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 the relay device of the first embodiment of the relay device of the present invention, and FIGS. Block diagrams showing 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 conventional relay device. It is a block diagram of a centralized control system including. 1 ... Central processing unit, 2a to 2f ... Terminal device, 3 ... Repeater device, 4a, 4b ... Power feeding device, 4c ... Power feeding circuit, 5a, 5b ... Transmission line, 10 ... Control circuit, 11a , 11b ... Reception circuit, 12a, 12b
...... Transmission circuit, 13a ...... First voltage detection circuit, 13b ...... Second voltage detection circuit, 15 ・ ・ ・ Feed current detection circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A central side transmission line connected to a central processing unit for controlling a plurality of terminals, a terminal side transmission line connected to the terminal, and the central side transmission line and the terminal side transmission line. In the relay device provided in, the first transmitting / receiving means for receiving a signal from the central processing unit via the central transmission line and transmitting the signal to the terminal, and transmitting / receiving from the terminal via the terminal transmission line. Second transmission / reception means for receiving a signal and transmitting it to the central processing unit; energization detection means for detecting an energization state of the central side transmission line or the terminal side transmission line; and based on a detection result of the energization detection means Control means for judging an abnormality of the central processing unit side or the terminal side to control the first or second transmitting / receiving means and transmitting the abnormality to the terminal side or the central processing unit side. Relay device. 2. A central-side transmission line connected to a central processing unit for controlling a plurality of terminals, a terminal-side transmission line connected to the terminal, and between the central-side transmission line and the terminal-side transmission line. In the relay device provided in, the first transmitting / receiving means for receiving a signal from the central processing unit via the central transmission line and transmitting the signal to the terminal, and transmitting / receiving from the terminal via the terminal transmission line. Second transmission / reception means for receiving a signal and transmitting it to the central processing unit, energization detection means for detecting an energization state of the central side transmission line, and control contents at the time of abnormality that may occur on the central processing side When an abnormality on the side of the central processing unit is judged based on the storage means for storing and the detection result of the energization detection means, the first transmission / reception means is controlled according to the control content stored in the storage means, and the stored control is performed. Contents to the terminal side A relay device comprising: a control unit for transmitting. 3. A central-side transmission line connected to a central processing unit for controlling a plurality of terminals, a terminal-side transmission line connected to the terminal, and the central-side transmission line and the terminal-side transmission line. In the relay device provided in, the first transmitting / receiving means for receiving a signal from the central processing unit via the central transmission line and transmitting the signal to the terminal, and transmitting / receiving from the terminal via the terminal transmission line. Second transmission / reception means for receiving a signal and transmitting it to the central processing unit, power supply means for supplying power to the terminal side transmission line, power supply detection means for detecting power supply of the power supply means, and detection result of the power supply detection means And a control means for controlling the second transmission / reception means and transmitting the abnormality on the terminal side to the central processing unit side by judging the abnormality on the terminal side.