JPH0965455A - Transmission reception method in inverter drive remote setting display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the communication processing speed by allowing a remote setting display device to receive simultaneously communication texts from inverters so as to obtain frequency data and parameters so as to display the data on a monitor in real time. SOLUTION: Inverters send communication texts TR2 to plural remote setting display devices placed at a remote location. Each remote setting display device receives simultaneously communication texts TR2 to display a frequency in each text and to display a parameter being a station number on read request through key operation. A station whose station number is designated sends information of a frequency displayed at a current point of time and of a content of a parameter designated by key input, if any, in addition to the inverter as an answer. After the reception of the answer, the inverter sets a succeeding station number to a text TR2 and sends the resulting text. Thus, any remote setting display device displays the received information on its monitor in real time and the communication processing speed is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception method in an inverter drive remote setting display system for transmitting / receiving a remote setting display between, for example, a site side and an inverter body side.

[0002]

2. Description of the Related Art In an inverter drive, for example, a transmission / reception method in an inverter drive remote setting display system is known, in which a setting display signal is transmitted and received between a remote setting display installed on the site side and the inverter body side. Has been. Generally, in order to set parameters such as the operating frequency and acceleration / deceleration time of the inverter in the inverter drive, the main unit setting indicator connected to the inverter main unit and the remote setting indicator at a remote place, for example, in the field It is supposed to be. Also, only the parameters required for inverter operation can be set on the remote setting display side, and the main unit setting display example allows setting up to inverter constants other than inverter operating parameters.
It is normal. This will be described with reference to FIGS.

FIG. 5 shows a system of an inverter drive remote setting display system, where INV is an inverter.
, DI is the main unit setting indicator, RI1, RI2, ... RI
n is the first, second, ... nth remote setting display, A
1 and B1 are transmission lines, and A2 and B2 are reception lines. FIG. 6 shows an example of a communication message from the inverter, TR
1 is a communication message. Here, the remote setting display RI1,
RI2, ..., RIn are connected to each setting display device with a unique station number. The communication line is managed by the inverter INV, and the inverter INV transmits the frequency display data, which is the current output, such as the communication telegram TR1, and is connected to a remote station with a unique station number for each remote setting display unit. The setting display receives when the reception station number at the beginning of the communication message TR1 and the own station number match, and ignores the message when they do not match.

FIG. 7 is a flow chart of transmission / reception of an example in which two units are connected. RP1 is monitor display data for the first remote setting display RI1, RP2 is an answer (parameter request) from RI1, and RP3 is for RI1. Parameter data, RP4 is the answer from RI1, RP5 is the monitor display data for the second remote setting display RI2, RP6
Is an answer from RI2 (request paramehater), RP7
Is the parameter data for RI2, and RP8 is the answer from RI2.

That is, the first remote setting display RI1
Performs processing based on the contents of the received message, and when a parameter read request or parameter writing is performed by key operation, the contents are added and the communication message is transmitted as an answer to the inverter INV side.
When the received answer is a parameter read request, the inverter INV side transmits the parameter to the remote setting display RI1 side. When the parameter is not transmitted, the communication telegram TR1 is transmitted to the second remote setting display RI2.

When the remote setting display RI1 receives the parameter, the remote setting display RI1 displays the received parameter and sends the answer message of the communication message to the inverter INV. Then, when the inverter INV receives the answer from the far setting display RI1, the communication telegram TR1 is transmitted to the far setting display RI2. After this, repeat until the connected station number. Such a timing chart is as shown in FIG.

[0007]

In the prior art of this type, for example, the frequency display data is transmitted for each connected remote setting display unit, and it is particularly queried whether the frequency setting is changed by the operation key. Therefore, there is a difference in reception time between the far setting indicators. This is because the display data changes in the case of frequency display during acceleration / deceleration, so there is a display delay even if connected to the same line, even if the communication speed and communication processing are improved. I can't solve it. In addition, the main unit side setting display is usually able to set many items other than the inverter operation parameter, and for example, the inverter constant can be set, and the operation is complicated.

Therefore, an object of the present invention is to provide a transmission / reception method in a special inverter drive remote setting display system capable of displaying in real time on any remote setting display connected to a plurality of units. It is in. Further, by disposing a remote setting indicator on the site side on the inverter body side, the operator can change only the parameters necessary for the inverter operation.

[0009]

According to the present invention, in a transmission / reception method in an inverter drive far setting display system, a far setting indicator is provided also on the side of the inverter main body, and the far setting indicator simultaneously transmits communication messages from the inverter. The frequency display data and parameters in the received communication message are obtained, and the station number designating station can answer the frequency display or parameter being changed.

With this solution, the following operational effects can be obtained. (B) On the inverter body side, the operator can easily change only the parameters required for inverter operation. (B) Regardless of the station number being communicated with, it is possible to display the frequency on any distant setting display and read the inverter parameters. (Answer is the display frequency or parameter being changed)

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specifically, the remote setting display does not always receive a communication message as shown in FIG.
Answer the communication message as shown in. Here, FIG. 1 shows an example of a communication message from the inverter.
R2 is a communication message. Further, FIG. 2 shows an example of an answer from the designated station far setting display, and TR3 is a communication message. Further, the present invention will be described in detail with reference to the drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an example of a flow chart of transmission and reception to which the present invention is applied, which is similar to FIG.
RP11 is a communication message to the first remote setting display RI1,
RP12 is an answer from RI1, RP13 is a communication message to the second remote setting display RI2, and RP14 is an answer from RI2. FIG. 4 shows the timing chart of FIG.

That is, the inverter INV sets the receiving station number in the remote setting display RI1 and transmits the communication message (RP11) of the monitor display data. The distant setting display simultaneously receives the communication telegram TR2, and the distant setting display displaying the frequency displays the received frequency. For the station number for which a data read request is made by key operation, the parameter is read from the communication telegram TR2 and displayed. Since the remote setting display RI1 is given the right to send an answer from the inverter INV, the frequency currently displayed and the content of the parameter written when a key operation is performed are added, and the communication telegram TR3 is added. As an answer to the inverter INV. From this, when the inverter side receives the answer of the remote setting display RI1, the receiving station number of the remote setting display RI2 is set,
The communication message TR2 is transmitted. Repeat from this point on because the connected station number is used.

In this way, the frequency can be displayed in real time without depending on the number of connected stations. In addition to this, it is apparent that the failure display and the like can be simultaneously displayed from the inverter side. Moreover, if a plurality of parameters are transmitted, the parameters can be transmitted to any distant setting display device, and further parameters can be displayed and the setting can be changed.

[0015]

As described above, according to the present invention, it is possible to provide a special method capable of performing monitor display in real time on any remote setting display device. Further, it is not necessary to communicate the answer of the parameter reading request from the remote setting display, and the communication processing speed can be improved by the monotonous communication means.
The communication interval to the remote setting display can be made constant.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a communication message from an inverter to which the present invention is applied.

FIG. 2 is an explanatory diagram showing an example of an answer from a designated station far setting display to which the present invention is applied.

FIG. 3 is a diagram showing an example of a transmission / reception flowchart to which the present invention is applied.

FIG. 4 is a diagram showing a timing chart of FIG.

FIG. 5 is a system diagram shown for explaining the conventional technique.

FIG. 6 is an explanatory diagram showing an example of a communication message from the inverter.

7 is a diagram showing a flowchart of transmission / reception of FIG.

8 is a diagram showing a timing chart of FIG. 6;

[Explanation of symbols]

 INV Inverter DI Main body RI1 1st remote setting display RI2 2nd remote setting display RIn nth remote setting display RP1 Monitor display data to RI1 RP2 Answer from RI2 (parameter request) RP3 To RI1 Parameter data from RP4 RI1 Monitor display data from RP5 RI2 Answers from RP6 RI2 (parameter request) RP7 Parameter data from RI2 RP8 Answers from RI2 RP11 Communication message from RI1 RP12 Answers from RI1 RP13 To RI2 Communication message RP14 Answer from RI2 TR1 Communication message TR2 Communication message TR3 Communication message

Claims (1)

[Claims] 1. A transmission / reception method in an inverter drive far setting display system for transmitting or receiving, via a communication line, an inverter for driving an electric motor and a far setting indicator arranged at a place farther from a place where the inverter is installed. The setting display is designed to receive the communication message from the inverter at the same time to obtain the frequency display data and parameters in the communication message, and the station number designated station can answer the frequency display or the parameter being changed. Inverter drive remote setting display system.