JPH08251670A - Control communication equipment for air conditioning device - Google Patents

Abstract

PURPOSE: To repair an error in connection polarity by automatically inverting connec tion to transmission lines when data are not received even after the elapse of pre scribed time. CONSTITUTION: Plural control devices 1 each of which is provided with a transmitting means 3, a receiving means 4, polarized two-wire communication means 2, and a control part 5 are respectively connected to two transmission lines 8, 9 in parallel and mutually transmit/receive serial data to control respective air conditioning devices for instance. In this case, one of the plural control devices 1 is set up as a master control device and others are set up as slave control devices. Each slave control device 1 is provided with a communication polarity reversing means 10 consisting of a switching relay, a logic element circuit, etc., and a timer. When data are not received from the master control device 1 even after the elapse of prescribed time from its start after the completion of wire connection, the reverse polarity is judged and the polarity of connection to the transmission lines 8, 9 is automatically reversed through a communication polarity reversing means 10. When the automatic reversing operation of connection polarity exceeds the prescribed number of times, the state is judged as a transmission line fault other than a connection error and an alarm is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a control device for a plurality of air conditioners or a plurality of control devices for controlling an air conditioner.
The present invention relates to a control communication device of an air conditioner connected in parallel by a transmission line of a line.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a configuration of a control device used for a control communication device of a conventional air conditioner of this type. As shown in the figure, the control device 1 comprises a transmitting means 3, a receiving means 4, a polarized two-wire communication means 2 and a control section 5, and its terminal 6,
7 is connected to the transmission lines 8 and 9, respectively. A plurality of control devices 1 having such a configuration are connected in parallel with two transmission lines 8 and 9 as shown in FIG. 6 to form a control communication device, and a master device control device 1 _{1 to a} slave device control device are configured. 1 ₂ to 1
to _n, it is performed the serial data transceiver from the slave unit control device 1 ₂ to 1 _n the parent device controller 1 _1.

[0003]

In the control communication device having the above-mentioned conventional structure, the transmission line 8 and the transmission line 9 need to be connected to the terminals 6 and 7 of the control device 1, respectively, which have the same polarity. If the polarities are connected in reverse due to problems such as, the communication will be disabled and it is necessary to re-wire.

The present invention has been made in view of the above-mentioned problems, and eliminates the above-mentioned problems and enables communication even when terminals of a control device are connected without matching the polarities of transmission lines with a simple structure. An object of the present invention is to provide a control communication device for a simple air conditioner.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a plurality of control devices connected in parallel to two transmission lines, each control device including a transmission means, a reception means, and A polar two-wire communication unit and a control unit for controlling them are provided, and one of the plurality of control devices is a master unit and the other is a slave unit, and the master unit control unit to the slave unit control unit and the slave unit control. In a control communication device of an air conditioner for transmitting / receiving serial data from the device to the master device control device to control the air conditioner, at least the slave device control device of the control device is provided with communication polarity reversing means, and each slave device control device. The control means includes a means for automatically reversing the connection polarity to the transmission line via the communication polarity reversing means when no data is received from the master unit control device even after a lapse of a predetermined time from the start-up. Characterize.

Further, the control communication device of the air conditioner is characterized by further comprising an abnormality display means for displaying a communication abnormality when the number of inversions of the polarity of connection to the transmission line reaches a predetermined number.

[0007]

According to the present invention, by adopting the above configuration, when the transmission line is connected in reverse polarity between the master unit control device and the slave unit control device, even if the slave unit control device starts up, the master unit control device is activated. Unable to receive data from. At this time, if the slave unit control device does not receive data even after a predetermined time has elapsed from the start-up, it automatically reverses the connection polarity to the transmission line via the communication polarity reversing means. The polarities of the child device control devices match, the child device control device can receive data from the parent device, and the child device control device can also send data to the parent device control device. Therefore, when installing the control communication device of the air conditioner, the installation work can be performed without being aware of the polarity of the transmission line, and the occurrence of erroneous wiring can be prevented.

Further, when the number of times the polarity of connection to the transmission line is reversed reaches a predetermined number, a communication abnormality is displayed. If this communication abnormality is displayed, this communication abnormality is due to an abnormality other than the incorrect wiring of the transmission line. Can be identified.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a control device used in a control communication device of an air conditioner of the present invention. As shown
The control device 1 shown in FIG. 5 is that the control device 1 includes a transmission means 3, a reception means 4, a polarized two-wire communication means 2 and a control section 5.
Is the same as This control device is different from the control device 1 shown in FIG. 5 in that the communication polarity reversing means 10 is provided between the polarized two-wire communication means 2 and the terminals 6 and 7. A plurality of control devices having the above-mentioned configuration are connected in parallel to the two transmission lines 8 and 9 as shown in FIG. 6, and the master device control device 1 _{1 to the} slave device control device 1 _{2 are connected.}
And performing serial data transmission and reception to to 1 _n from the slave unit control device 1 ₂ to 1 _n the parent device controller 1 _1.

As described above, the master unit controller 1 ₁ and the slave unit controllers 1 ₂ to 1 _n have the same structure, but the master unit controller 1 ₁ has its communication polarity reversing means 10 to operate the DIP switch. Has stopped its function. That master unit controller 1 ₁ has no communication polarity reversal.

In the control device having the above-mentioned configuration, the control unit 5 is provided with a monitoring timer (software (not shown) may be used), and the control device 1 as a child device monitors the time with the monitoring timer after the control device 1 has started up. If, however, no data is received from the control device 1, which is the parent device, after a predetermined time has elapsed, the communication polarity reversing means 10 is activated to reverse the connection polarity of the terminals 6 and 7 to the transmission lines 8 and 9. . As a result, the transmission lines 8 and 9 are connected between the control device 1 which is the master device and the control device 1 which is the slave device.
When the data cannot be received because the polarity of the connection to the terminal is opposite, the polarities match, so that the control device 1 as the slave can receive the data.

FIG. 2 is a diagram showing an example of the communication polarity reversing means 10, and the communication polarity reversing means 10 comprises a switching relay 11. When a switching signal is input to the switching relay 11 from the control unit 5 through the control signal line 13, the contact is switched, the connection of ae, cf is switched to the connection of be, df, and the transmission is performed. The connection polarity to the lines 8 and 9 is switched.

FIG. 3 is a diagram showing another example of the communication polarity reversing means 10. The communication polarity reversing means 10 is an exclusive OR circuit 12
The connection polarity to the transmission lines 8 and 9 is switched when the control unit 5 inputs a signal of “0” or “1” to the control signal line 13.

FIG. 4 is a diagram showing a communication polarity reversal processing flow. First, the control unit 5 of the control device 1, which is a child device, starts the monitoring timer at the same time when the control device 1 starts up (step S01). Subsequently, it is determined whether or not the monitoring timer set by the monitoring timer has timed out (whether or not a predetermined monitoring time has elapsed) (step S02), and if the monitoring timer has timed out, the communication polarity reversing means 10
A switching signal is sent to the control signal line 13 to reverse the communication polarity (reverse the connection polarity to the transmission lines 8 and 9) (step S0).
3). The set time of the monitoring timer is set to a value sufficiently larger than the frequency of communication between the control devices 1. For example, if the communication is performed at a cycle of 1 second and the transmission quality is good, the set value is set to about 5 seconds.

Then, the monitoring timer is restarted (step S04), an inversion counter for counting the number of communication polarity inversions is added (step S05), and it is judged whether or not the inversion counter is counting out (step S).
06), if it is not a countout, the above step S0
Returning to step 2, when the count-out, that is, the communication polarity inversion is performed a predetermined number of times, the communication abnormality is displayed (step S
07), the processing ends.

In step S02, the transmission line 8,
9 is normally connected to the control device 1 as a slave unit, and if normal data is received before the monitoring timer times out, it is determined that normal data is received in step S08, and the monitoring timer is restarted (step S09), and returns to step S02.

When the transmission lines 8 and 9 are completely disconnected due to disconnection, failure or the like, the communication polarity reversing operation is repeated in step S03, and the added value in step S05 increases to reach the specified value. When it reaches, a communication error is displayed outside,
It can be seen that there is an abnormality other than the incorrect connection of the transmission lines 8 and 9.

As described above, according to this embodiment, even if an error occurs in the connection polarity of the transmission lines 8 and 9 when the control communication device of the air conditioner is installed, the error can be repaired by the subsequent operation.

In some cases, one control device 1 is provided for each of a plurality of air conditioners constituting an air conditioner, or a plurality of control devices 1 are configured to control one air conditioner. There are also cases.

[0020]

As described above, according to the present invention, the following excellent effects can be obtained. (1) Since the communication inability when the transmission lines are connected in reverse polarity between the master unit control device and the slave unit control device is automatically repaired through the communication polarity reversing means, control communication of the air conditioner is performed. When installing the device, the installation work can be performed without paying attention to the polarity of the transmission line, and the occurrence of erroneous wiring can be prevented.

(2) When the number of times the polarity of connection to the transmission line is reversed reaches a predetermined number, a communication abnormality is displayed. When this communication abnormality is displayed, this communication abnormality is due to an abnormality other than the incorrect wiring of the transmission line. Can be identified.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a control device used in a control communication device of an air conditioner of the present invention.

FIG. 2 is a diagram showing a configuration example of a communication polarity reversing unit of a control device used in the control communication device of the present invention.

FIG. 3 is a diagram showing a configuration example of a communication polarity reversing means of a control device used in the control communication device of the present invention.

FIG. 4 is a diagram showing a communication polarity reversal processing flow of the control communication device of the present invention.

FIG. 5 is a diagram showing a configuration of a control device used in a control communication device of a conventional air conditioner.

FIG. 6 is a diagram showing a configuration example of a control communication device of an air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control device 2 Polarized 2-wire communication means 3 Sending means 4 Receiving means 5 Control part 6 Terminal 7 Terminal 8 Transmission line 9 Transmission line 10 Communication polarity reversing means 11 Switching relay 12a Exclusive OR circuit 12b Exclusive OR circuit 13 Control signal line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taku Kawanishi 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Inside the EBARA Research Institute, Inc. (72) Inventor Kazufumi Tateishi 4-2-1, Fujisawa, Kanagawa No. 1 Incorporated EBARA Research Institute (72) Inventor Chuichi Sone 4-2-1 Motofujisawa, Fujisawa City, Kanagawa Incorporated EBARA Research Institute

Claims (2)

[Claims] 1. A plurality of control devices connected in parallel to two transmission lines, each control device including a transmission means, a reception means, a polarized two-wire communication means, and a control means for controlling them. Then, one of the plurality of control devices is a master device and the other is a slave device, and serial data is transmitted and received from the master device control device to the slave device control device and from the slave device control device to the master device control device. In a control communication device of an air conditioner for controlling an air conditioner, at least a slave unit control device of the control device is provided with a communication polarity reversing unit, and the control unit of each slave unit control device has passed a predetermined time from startup. Even if there is no data received from the master unit controller,
A control communication device for an air conditioner, comprising means for automatically inverting the connection polarity to the transmission line via the communication polarity reversing means. 2. The air conditioner control communication device according to claim 1, further comprising an abnormality display means for displaying a communication error when the number of times of reversal of the connection polarity to the transmission line reaches a predetermined number. Control communication device for air conditioner.