JP2000295894A - Communication system for controlling motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible sending-backs of the confirmations of incoming calls as well as full and group simulcast communications, by forming identification codes out of three patterns comprising a plurality of digits, and by adding selectively to a transmitting information one of the three patterns of the identification codes. SOLUTION: A number comprising two digits is assigned to an identification code in a communication system for controlling motors to use given one of the individual numbers of 00-99 to each inverter 5. In the case of a full or group simulcast communication, the slave station whereto predetermined one of the plural assigned inverters 5 belongs sends back to a master station 8 the confirmation of a call incoming. Also, when one inverter 5 is assigned individually by its correspondent identification code in an information processing portion 12, the confirmations of the identification code and its reception are performed successively to perform necessary communications to a drive controlling portion 3. Simultaneously with this, in a transmitting-information creating portion 13, the confirming information of a call incoming is created to send back it from a transmitting portion 10 to the master station 8. As a result, both the full and group simulcast communications are made possible, and the sending-backs of the confirmations of call incomings can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a configuration in which information relating to motor control is transmitted and received between a plurality of slave stations each including an inverter for driving and controlling the motor and a communication device and one master station. The present invention relates to a control communication system.

[0002]

2. Description of the Related Art In the following description, a code does not mean a binary code [0] or [1], but means a character, a number or a symbol. The digit is used to mean that the code is composed of N digits when N (plural) codes having such a meaning are collected to constitute one identification code.

[0003] For example, in a motor control system related to an extremely large configuration such as a steel plant, a paper mill, or a chemical plant, a predetermined program is provided so that a large number of motors provide an operating state that maintains a predetermined correlation. Some are configured to be controlled according to the following. For this purpose, transmission / reception of information related to motor control is performed between a plurality of slave stations including an inverter for driving and controlling the motor and a communication device and one master station, that is, a central control center mainly including a personal computer. A communication network has been configured. Information such as start, stop, forward and reverse control signals and frequency signals (speed commands) for the inverters of each slave station according to the control program according to the control commands by the user operating the personal computer at the central control station Is transmitted to control the inverter. Thereby, each electric motor arranged in each part of the line is synchronously driven and controlled to wind up a steel sheet or paper based on the received information,
In order to adjust the flow rate of the chemical, control is performed to adjust the opening of a valve in the pipe.

[0004]

In such a motor control communication system, since a single transmission line is used, a slave station identification code is added to transmission information from the master station, and the information is multiplied. Of the number of slave stations, the slave station whose identification code matches is received. In communication in which information is sequentially and individually transmitted to a large number of slave stations by an identification code, the slave station uses a signal for confirming reception, that is, a reply of an incoming call confirmation, as a master station every time specified by the identification code. However, in broadcast communication in which the same information is transmitted to all slave stations at the same time, if a reply of the incoming call confirmation is sent, the reply information and the transmission information from the master station collide on a single transmission path.
There is a drawback that it is not possible to reply to such an incoming call confirmation. In the case of broadcast communication, since there is no reply of the incoming call confirmation at the master station, it was uneasy whether the control was performed as instructed.

In a conventional communication system of this type,
There is no choice but to specify the slave station from the master station as individual communication or the whole broadcast for all slave stations. For example, broadcast to a desired plurality of slave stations among all the slave stations. That was impossible.

Accordingly, an object of the present invention is to provide individual communication between a master station and slave stations, all-broadcast communication for all slave stations, and group broadcast communication for a plurality of desired slave stations. And a communication system for controlling the electric motor which can return the incoming call confirmation even in the broadcast state.

[0007]

A communication system for controlling a motor according to the present invention is capable of transmitting and receiving information to and from a plurality of slave stations each including an inverter and a communication device for driving and controlling the motor. An identification code judging unit for judging whether or not the received information is specified by the own station based on the identification code added to the information received from the master station in the communication device of each slave station and the communication device of each slave station. A communication system, wherein the identification code is composed of a plurality of first digits.
It consists of the second and third patterns, and the identification code of one of these patterns is selectively added to the transmission information.

[0008] The first pattern of the identification code is a code pattern composed of individual codes assigned to each slave station in advance, and the second pattern is a code pattern in which codes of all digits are replaced with non-determination codes. The third pattern is a code pattern in which some digits are replaced with non-determination codes. When the identification code of the transmission information is the first pattern,
One slave station with the same individual code of all digits is specified,
In this pattern, all slave stations are designated, and the third pattern designates a slave station in which individual codes of digits other than the digit of the non-determination code match.

When it is desired to individually transmit information from the master station to the slave stations, if a first pattern is added as an identification code, one slave station having the same individual code over all digits is designated.
Individual communication becomes possible. When it is desired to perform broadcast communication with all the slave stations, the second pattern is selected as the identification code. Thereby, the identification action of the individual code given to each slave station for identification is nullified by the non-determination code of the identification code,
All slave stations connected to the transmission line are specified.

[0010] A plurality of slave stations among all the slave stations are grouped into one group, and when it is desired to broadcast the group, a third pattern is selected. In the third pattern, a slave station of an individual code having a part of the same code as the code of the digit which is not replaced with the non-determination code among all the digits of the identification code is designated. In this case, since the matching between the identification code and the individual code is performed only for some digits, a plurality of slave stations are specified.

In another preferred first means of the present invention, the identification code has a fourth pattern including an even or odd designation symbol in some digits, and in the fourth pattern, the identification code is located at a predetermined digit position. It is configured such that a slave station having an even-numbered or odd-numbered individual code corresponding to the designated symbol is designated.

In the second means, the identification code has a fifth pattern including a specific symbol indicating "less than" or "more than" and a number, and in the fifth pattern, the identification code is equal to or more than the number. It is configured such that a slave station having an individual code of the number to which it belongs is designated.

[0013] In the third means, the identification code is "other than"
, And a sixth pattern including an individual code and an individual code. In the sixth pattern, a slave station having a code other than the specific code is designated. The fourth means has a seventh pattern including a specific symbol indicating the operation state of the inverter, and the control in which the inverter in the state indicated by the specific symbol among the slave stations that has received the seventh pattern is controlled by the received information. It has become.

In the fifth means, when a plurality of slave stations are simultaneously specified by the identification code, a predetermined one of the slave stations, for example, a slave station having the smallest number as an individual code is selected, and the slave station is selected. An incoming call confirmation is returned to the master station.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
, An operation control unit 3 for providing a control signal to the inverter main circuit 2, and a communication device 4 for allowing the operation control unit 3 to communicate with another device. Note that the inverter main circuit 2 and the operation control unit 3 constitute the inverter 5. The slave stations are A00 and A in FIG.
As shown by reference numerals 01, A02, A03, A12, A14, and A21, a plurality of, for example, seven units are arranged.
Are connected by a communication cable 6. Each inverter main circuit 2 is supplied with a power supply for driving a motor from a power supply 7.

The master station 8 is a personal computer (hereinafter, referred to as a personal computer).
A personal computer) is connected to the communication device 4 of each inverter 5 via a communication cable 6, and these form a control network. When the user operates the keyboard 8a, the master station 8 transmits new information, for example, a control program, to the operation control unit 3 of each inverter 5 to rewrite it, sets a control mode, and controls the operation of each electric motor 1. Settings, commands, etc. can be performed. In addition, driving information and the like received via the communication cable 6 are displayed on the display 8b.

The operation control unit 3 is mainly composed of a microcomputer, and has a built-in EE, for example.
The inverter main circuit 2 is controlled in accordance with a control program written in a memory such as a PROM or a RAM, and thereby the operation of the electric motor 1 is controlled.

The operation control unit 3 also provides various information on the operation states of the motor 1 and the inverter main circuit 2 connected thereto, such as an operation current value, an operation time, an open phase, and an abnormal operation signal such as a ground fault. Is periodically obtained from various measuring instruments (not shown). And
Once the various information is stored in the internal memory,
The data is transmitted from the communication device 4 to the personal computer 8 via the communication cable 6 at regular intervals.

As shown in FIG. 4, the inverter 5 of each slave station has a plurality of digits, for example, two digits from "00" to "99" for discrimination between itself and others as described as "INV-00". The inverter number is given in advance as an individual code. As shown in FIG. 3, a communication device 4 of each slave station includes a transmission path, that is, an interface 9 connected to a communication cable 6, and a transmission / reception unit 10 connected to the interface 9 and transmitting / receiving information to / from a partner station via the interface. When,
A reception information decoding unit 11 that decodes reception information, and an information processing unit 12 that performs processing such as command processing and parameter setting of reception information and processes information from the operation control unit 3.
And a transmission information creating unit 1 for creating information to be transmitted to the partner station.

As shown in FIG. 5, the format of the communication information is a start code B1, an identification code B2 for identifying the inverter 5 as a slave station, a command B3, a parameter B4, data B5, a checksum B6, and an end code B.
7 are arranged in this order.

Next, the identification code B2, which is a direct object of the present invention, will be described with reference to Table 1. The code form of the identification code B2 is assigned a plurality of digits, specifically two digits, and the individual number (inverter number) assigned to each inverter 5 uses a two-digit number “00” to “99”.
Furthermore, non-numerical symbols (hereinafter, referred to as specific symbols as necessary) are used as codes constituting the identification code.
"*", "E", "O", "<", ">", "!",
"S" is selectively used, and as shown in the code form column as an example, all of these specific symbols are
Alternatively, some of the digits are replaced with numbers to form an identification code.

Here, “*” is a non-judgment symbol.
The first code is a code pattern in which numbers are set in all digits as shown in the column a, and the second code pattern is a code pattern in which all digits are replaced with "*" as shown in the column b.
There is a code configuration in which a code pattern in which only some of the digits are replaced with “*” as a third pattern as shown in columns C and D is used as the third pattern.

The "*" sign has a function of searching for a match between the identification code and the inverter number only in the digits other than the digit where the sign "*" is located. The discriminating effect of the numeral in which "is located is invalidated. As a result, in the case of the first pattern in which the identification code exemplified in the column a is [01], as shown in the column "identification target (designated inverter)" in the column a, the same as the two-digit number is specified. Inverter number (hence [0
1], and an individual communication state is formed.

In the second pattern, the discriminating action by the numeral is invalidated for all two digits by "*", so that all the inverters 5 are designated by the discriminating code [**] illustrated in the column (b). In the third pattern, since only the digit of the digit where “*” is not located in the inverter number is the identification target code, “*” of the identification code [* 2] exemplified in the C column of the second digit is included. In this case, the inverter number [0
[0] to [99] whose first digit is “2” ([02, [12],..., [82], [9]
2]) is designated. In the identification code [1 *] in the example of the second column in which “*” has the first digit, the second digit is “1”.
Outgoing numbers ([10], [11],..., [1]
8] and [19]) are specified.

Next, the specific symbol "E" has a function of designating that the number of the digit where the symbol "E" is located in the inverter number is an even inverter number. The sign of the digit where "" is not located specifies the digit of that digit of the inverter number. In the identification code [2E] exemplified in column F of Table 1, in the inverter number, the second digit is “2” and the first digit is an even number ([2
2], [24],... [28]).

In the identification code [* E] exemplified in the column E, the second digit of the inverter number is "0" to "9".
In the range, the first digit is an even number ([02],
[04], ... [22], ... [98]). Although omitted in Table 1, the designation at the time of the specific symbol “O” of the even number designation is performed in the same manner except that the even number in the above description becomes an odd number. The specific symbol "<" or ">" is the number x
Constitutes an identification code such as [<x] or [> x], and is greater than or equal to the number indicated by the digit where the number x is located,
Alternatively, it has a function of designating an inverter having the following number. In the identification code [<05] illustrated in the example column, the inverter [0] whose first digit has a number less than or equal to [05]
5], [04],..., [00]).

The specific symbol "!" Is represented by the number x and [! x], and an inverter other than the same number as the numeral x following “!” is designated in the inverter number.

Although omitted in Table 1, when the identification code is [S1], all broadcast stations are set, and among all the slave stations, the slave station whose inverter is in the trip state resets the inverter. .

In the case of all-broadcast communication, or in the case of group broadcast communication, one of a plurality of designated inverters, for example, a slave station to which the inverter with the smallest number belongs performs an incoming call confirmation return.

The identification function (identification code determination means) for specifying the inverter by the identification code as described above is provided to the reception information decoding unit 11 of the communication device 4 provided in each slave station shown in FIG. I have.

As exemplified in column a of Table 1, when the inverters 5 are individually designated by the identification code corresponding to one inverter 5, that is, when information from the master station 8 arrives, the designation is made. In the communication device 4 of the selected inverter 5, the information processing function F1 enters the state of u2, and the information processing section 12 processes the received information following the identification code,
Necessary communication with the operation control unit 3 is performed. Sending function F2 at the same time
Is in the state of u4, and the transmission information creation unit 13 creates a reception confirmation information, and returns it from the transmission unit 10 to the master station 8 to execute a program. In FIG. 3, the symbol u1 schematically indicates that the processing of the reception information following the identification code is stopped, and the symbol u3 schematically indicates that the incoming call confirmation return is not performed.

[0032]

[Table 1]

[0033]

Embodiment 1 First Embodiment (see FIG. 1) << When the reception identification code is [01] (individual designation function of the inverter) >> The identification code [y2 y1] added to the information transmitted from the master station 8 Is [01], the slave station receiving this performs the following operation. For convenience of explanation, it is assumed that NO is always set in step P12.

In step P1, the own inverter number [01]
Are the identification codes in invNx [x2 x1] and i
nvNz [z2 z1], and the next step P
In step 2, the number of check characters n is set to 2, and step P3
Move to The number of check characters is the number of digits of the identification code. In this example, since it is two digits, n = 2. Step P
In step 3, every time the identification code [01] is received, a process of extracting the code one by one in the order of reception is performed.

In the next step P4, it is determined whether or not the sign of the first digit (the second digit) taken out is a numeral.
In this example, the n-th digit of [01] of the reception identification code, that is, 2
YES because the digit "y2" is [0] and is a number
And in the next step P5, the reception identification code (rx
dN), the n-digit (here, the second digit) code “0” is [y2
y1] is set to "y2".

Subsequently, the flow shifts to step P8, where n-1
Is calculated, but at this point n
= 2, so that n-1 = 1. Therefore, in the next step P9, the result is NO, and the process returns to step P3. In this step P3, the code received next, that is, the code "1" of the first digit is taken out, and it is determined in step P4 whether or not it is a number as in the above. Since the result is YES, the code "1" of the n-digit (here, the first digit) of the reception identification code (rxdN) is set to "y1" of [y2 y1] in the next step P5. Thus, rxdN [y2 y1] becomes [0
1], in other words, at this stage, invNx [x
2 x1] and rxdN [y2 y1] are x2 = 0, x1
= 1, y2 = 0, y1 = 1.

Subsequently, in step P8, n-1 = 0, step P9 becomes YES, and the routine goes to step P10. In this step P10, invNx = rxdN?
In this example, x2 x1 (= [01]) = y2 y1
(= [01]) is determined, and here, YES
Then, the routine goes to Step P11.

In step P11, invNz set in step P1 is compared with rxdN. In this case, the code [z2 z1] of the invNz is [01], which is the same as the own inverter number because the code has not been replaced in step P7, as will be understood later.
Since xdN is also [01] without being subjected to the replacement action, the result of the comparison is YES. Based on this determination result, the process shifts to the program process a1 in FIG. 1, recognizes that the own inverter No. 01 is specified by the identification code [01], continues the process of the received information, and returns the incoming call confirmation.

<< When the reception identification code is [* 2] (inverter group designation) "<Operation of slave station A01> In step P1, the own inverter number [01] is used as an identification code of invNx [x2 x1].
, And invNz [z2 z1], respectively. In the next step P2, the number n of check characters is set to 2, and the routine goes to a step P3. In step p3, every time the identification code [01] is received, a process of extracting the code one by one in the order of reception is performed. In the next step P4, it is determined whether or not the sign of the extracted first digit (second digit) is a numeral. In this example, the reception identification code [*
2], the n-th digit, that is, the second digit “y2” is “*” and not a numeral, so that the determination is NO.

In the next step P6, n (=
2) It is determined whether or not the sign x2 of the digit is a non-determination symbol, that is, "*". In this example, since it is "*", YES is determined, and the process proceeds to Step P7. This step P
In step 7, the identification code at the digit position of the non-determination symbol * is regarded as the same among invNx and rxdN. Therefore, the sign [0] of x2 and the sign "*" of y2 in the n-th digit, that is, the second digit, are forcibly replaced with [0], respectively.
As a result, [x2 x1] becomes [01] (in this example, the state is the same as the state at step P1), and [y2 y1] becomes [02].
Becomes

Subsequently, the process proceeds to steps P8 and P9 in the same manner as described above, and returns to step P3. In step P3, the code, that is, the code "2" in the first digit is extracted, and it is determined in step P4 whether or not the code is a number, as described above. Since the result is YES, in the next step P5, the n-digit (here, the first digit) code “2” of the reception identification code (rxdN) is set to “y1” of [y2 y1]. As a result, rxdN [y2 y1] becomes [02], in other words, even at this stage, invNx [x2 x1] and rx
dN [y2 y1] is x2 = 0, x1 = 1, y2 = 0, y1
= 2.

Subsequently, in step P8, n-1 = 0, step P9 becomes YES, and the routine goes to step P10. In this step P10, invNx = rxdN?
In this example, x2 x1 (= [01]) = y2 y1
(= [02]) is determined. Here, the determination is NO, and the final determination result is that the reception identification code [* 2] is the same as that of the own inverter [01] as shown by the program processing a2 in FIG. Since it is not specified, no further processing of the received information is performed.

<Operation of Slave Station A12> Slave station A as described above
In parallel with the operation of 01, the following operation is performed in the slave station A12. In step P1, the own inverter number [1
2] are set as invNx [x2 x1] and invNz [z2 z1] as identification codes. When the identification code [* 2] is received, rxdN [* 2] is replaced with [02] by the process in step P7, and invNx [12] is replaced with the second digit "x2", as in the case of the slave station A01. Is replaced with “0”, so [02]
become.

In step P10, invNx = r
xdN? In this example, x2 x1 (= [02]) = y2
It is determined whether or not y1 (= [02]). Here, YES is determined, and the routine goes to Step P11 where invNz set in Step P1 is compared with rxdN. In this case, the code [z2 z1] of invNz is [12] which is the same as the own inverter number since the code is not replaced in step P7, and rxdN is [02] due to the replacement action. From the comparison result is NO
It is. Based on this determination result, as shown by the program processing a3 in FIG. 1, the identification code [* 2] is recognized as the designation of the own inverter 12, the reception information processing is continued, and the reception confirmation return is not performed.

<Operation of slave station A02> Slave station A as described above
In contrast to the operation at 12, the slave station A02 performs the following operation. In step P1, the own inverter number [02] is used as the identification code invNx [x2 x1].
, And invNz [z2 z1]. When the identification code [* 2] is received, rxdN [* 2] is obtained by the process in step P7, as in the case of the slave station A01.
Is replaced by [02], and invNx [02] is 2
Since “0” of the digit “x2” is replaced with “0”, [0
2] (actually no change).

In step P10, invNx = r
Determination of xdN, x2 x1 (= [02]) = y2 in this example
It is determined whether or not y1 (= [02]).
It becomes ES and moves to Step P11. This step P1
In step 1, the invNz and rxd set in step P1
N is compared. In this case, the sign of invNz [z2
z1] is the same [02] as its own inverter number because it has not undergone code replacement in step P7.
Since dN is [02] due to the substitution action, the result of the comparison is YES. Based on this determination result, as indicated by the program processing a1 in FIG. 1, it is recognized that the own inverter 02 has been designated, the reception information processing is continued, and the incoming call confirmation is returned.

The operations in steps P6 and P7 have the following significance. In this routine, in both invNx and rxdN, the sign of the digit where the “*” is located is forcibly replaced with a specific same symbol, for example “0”, so the “*” digit between invNx and rxdN This means that the position code identification function has been invalidated.

The determination operation in step P11 has the following significance. The fact that the code “*” in the reception identification code rxdN has been replaced with “0” in Step P7 means that the replaced rx
It also means that dN is the minimum identification code. In step P11, it is determined whether or not the own inverter number matches the identification code of the minimum value.
When they match, the slave station AO2 having the smallest numbered inverter 02 among the plurality of inverters 02 and 12 specified by the identification code [* 0] is responsible for the operation of the incoming call confirmation return.

<Other slave stations A00, A03, A14,
Operation of A21> When the identification code is [* 2], as is clear from the description of the slave stations A02 and A12,
Since the first digit specifies the inverter having the number of “2”, the inverters belonging to the slave stations A00, A03, A14, and A21 are not specified.

As described above, when the identification code is [* 2], all the slave stations A00, A connected to the communication cable are connected.
01, A02, A03, A12, A14, and A21, the slave stations A02 and A12 to which the inverter 5 having the first digit number “2” belongs are designated, and the slave station A02 having the smallest number is designated.
Acknowledgment is returned. In this manner, a broadcast communication state is established for the plurality of inverters 5 designated as a group.

<When the received code is [**] (all inverters are specified)> When the received code is [**], step P5 → step P8 → step P9 → step P in FIG.
In the routine of No. 5, in step P5, n of rxdN
Since the sign of the digit is not always a number, in step P7, both the signs of the second and first digits of invNx and rxdN are replaced with “0”, and therefore, step P10
Then, the result is always YES for both digits. As a result, all the slave stations A00, A01, A0 connected to the communication cable
2, A03, A12, A14, and A21 are specified, and the slave station A00 having the smallest numbered inverter [00] returns an incoming call confirmation. In this way, a broadcast communication state for all the inverters 5 is established.

When "*" is the identification code [0 *] of the first digit, "*" in the first digit of the reception identification code rxdN is replaced with "0" in all the slave stations. The first digit of the inverter number invNx is "0".
, That is, the discriminating action by the first digit code is invalidated. In this state, invNx = rxdN? Is determined, the inverter [00] having the number corresponding to the second digit of the identification code has the second digit,
[01], [02], and [03] are specified.

<< Case where the identification code is omitted >> The case where the identification code is omitted means that in a system in which a plurality of slave stations are connected to the communication cable 6, one slave station is left for some reason. Corresponds to the case where the slave station is temporarily disconnected. In this case, the format in FIG. 5 is a format in which the identification code B2 is deleted. In this format, the code of the command B3 is received next to the start code B1, and since the code is not a numeral, the result is NO in Step P4, the result is NO in Step P6, and the process proceeds to Step P4. In this step P4, whether or not the identification code is omitted is determined based on whether or not n = 2. From the beginning, that is, when the received code is not a number and is not a specific symbol recognized to be used in the identification code when n is "2", it is determined that the identification code is omitted, and the result is YES. . As a result, the processing shifts to the execution of the program processing a1 in FIG. In other words, it recognizes the designation of its own inverter, continues the reception information processing, and returns the incoming call confirmation.

{Second Embodiment (FIG. 6) << Designation of Inverter Group by Specifying Even or Odd Number >> An example in which the identification code is [2E] will be described with reference to FIG. In FIG. 6, the difference from FIG.
6, Step P7 is Step P21, Step P2
2. The point that step P23 is replaced. When the identification code [2E] is received, the second digit “2” is processed in the same manner as in FIG. When the process proceeds to the process of the next first digit (n = 1), the sign of the first digit is "E" and not a numeral, so that step P4 becomes NO and step P4 becomes NO.
The process proceeds to 21.

In this step P21, it is determined whether or not the code of the n-th digit is an even code "E" or an odd code "O". In the next step P22, if the result of the determination is "E", n A process is performed in which “E” in the digit is replaced with “0”, and if it is an odd number, “O” is replaced with “1”.

Therefore, in this example, the reception identification code rx
dN [2E] is [20]. Although the flowchart is omitted for simplicity of processing, the slave station performs step P21
Is determined to be an even number or an odd number for each digit of the number assigned to its own inverter.

According to the result of the judgment, in step P23, if the same digit as the digit processed in step P22 is an even number, x2 (or x1) of invNx is replaced with "0", and if it is an odd number, A process of replacing with “1” is performed. In this example, since "E" is included in the first digit, i
nvNx [x2 x1] is invNx for even-numbered slave stations.
[X20], and in the odd-numbered slave station, invNx [x2
1].

After the processing in step P23, the step becomes P
8. The process proceeds to step P10 through P9. This step P
In 10 invNx = rxdN? Make a judgment. In this example, since rxdN changes to [20], this [2]
0] is [x2 0], that is,
x2 is [2] [20]. InvNx is [2
0] is only the number whose second digit of the inverter number is “2” and whose first digit is “even”.
In this example, even-numbered inverters in the 20's are specified.

In the case where the identification code is [* E], the identification function is invalidated by the numeral "*" in the inverter number,
Since it is specified that the number of the "E" digit is even,
A number whose second digit corresponds to one of “0” to “9” and whose first digit is an even number is designated. In the case of an identification code including an odd code “O” as a part, an even number in the above description need only be replaced with an odd number, and a description thereof will be omitted.

Third embodiment (FIG. 7) << Reset command to trip motor side inverter >> When the main circuit of the inverter is in an abnormal state such as an overcurrent, the inverter main circuit is disconnected from the motor. Alternatively, a so-called trip such as disconnecting the inverter main circuit from the power supply is performed. To enable the tripped inverter to be restarted, the inverter control circuit must be returned to the initial state. In the present embodiment, a reset command is transmitted from the master station 8 to the slave station group periodically or arbitrarily, and in the slave station group receiving the reset command, one or more inverters of the slave station to which the tripped inverter belongs are reset. At the same time, a reset command arrival confirmation return is performed from a predetermined one of the slave station groups.

The embodiment will be described below with reference to FIG. In this embodiment, the identification code added to the transmission information including the reset command is [S1]. Identification code [S
[1] is transmitted from the master station 8 to each of the slave stations A00 to A21, and this code is sequentially read out (from the second digit) in step P8. Is determined, and if not “S”, as indicated by the destination symbol h1, the step P in FIG.
The process proceeds to step P32.
Then, it is determined whether or not the next received code is "1".

Further, the process shifts to step P33 where it is determined whether or not the inverter 5 of the own station is tripping based on the reception of the reception identification code [S1]. And the contents [S1] of the reception identification code rxdN are forcibly replaced with [00].

In the next step P11, the own inverter number invNz = rxdN (= [00])? The judgment is made. This determination can be YES only when the own inverter number is invNz = [00]. Therefore, the slave station A0 having the minimum number of inverters
0 is the program processing a when step P11 is YES
Move on to execution of 1.

That is, the reception of the reset instruction is returned, and the processing of the received information including the reset instruction is performed. In this case, if the inverter 5 of the local station is tripping, information processing is performed for resetting the inverter. On the other hand, in the other slave stations, that is, in the slave stations other than A00, when step P11 is YES, the program processing a
Then, the process proceeds to step 3 to process the received information for resetting without returning the incoming call confirmation.

Fourth Embodiment (FIGS. 8 and 9) << Designation of an inverter group belonging to a certain number or more or less >> In this case, the identification code has a three-digit configuration.
The code "<" or ">" is used, and in this example, the identification code is [<05].
In the flow shown in FIG. 8, in step P40, it is determined whether the received code is ">" or "<". When the received code is ">" as shown in steps P41 and P42, the flag Fo =
If 1, "<", the flag Fu = 1. In this example, rxdN is used in the routine of steps P4, P5, P8, and P9.
Is set to [05], and Fu = 1.

In step P43, it is determined whether Fo or Fu is "1". If Fo = 1, step P44
The program proceeds to Step P45 when Fu = 1. Since Fu = 1 in this example, invNz is determined in step P45.
<RxdN is determined. In this example, since rxdN is [05], YES is obtained when invNz is equal to or less than [05], and the process proceeds to step P11 to perform the same operation as described with reference to FIG. In this case, the slave station for which YES is determined in step P45 has the inverter number of [05].
In addition to [04], [03], [02], [01],
This is a slave station having [00], and a group is designated in this way.

Fifth Embodiment (FIGS. 10 and 11) << Designation of an inverter group other than a certain number >> In this case,
The sign "!" Is used. In this example,
The identification code in this case is a three digit [! 04]. In the flow shown in FIG. 10, in step P50, it is determined whether or not the received code is "!". If YES, the flag Fe is set to 1 in step P51.
At 52, the received code is extracted one character at a time, and each time, the routine of steps P4, P5, P8, and P9 is executed, and rxdN is set to [04].

Step P9 becomes YES and step P
Proceeding to 53, here, Fe = 1? Judgment and i
nvNx = rxdN? It is determined that “Fe = 1 and invNx ≠ rxdN” = K1,
"Fe = 0 and invNx = rxdN" = K2,
“Fe = 1 and invNx = rxdN” = K3, and “Fe = 0 and invNx ≠ rxdN” = K4
Any one of the four judgment results is obtained.

In the case of K1, that is, when the received code is a number with "!", In a slave station having an inverter number different from that number, in step P54, rxdN = [00]? Is determined in the present example, since rxdN = [04], which is NO, the process proceeds to step P55 where the minimum number, rxdN =
Forcibly replaced by [00]. Moving to Step P11, invNz = rx as in the case of the embodiment shown in FIG.
A determination is made whether it is dN. Inverter number [00]
In the slave station rxdN = [00] and invNz = [00]
Is YES, that is, the program processing a1
Then, the information processing is continued assuming that it is the designation of the own inverter, and the reception confirmation return is performed.

When the judgment result of step P53 is K3,
That is, in the slave station having the inverter number that matches the number with “!”, The processing shifts to the program processing a2, and no further information processing is performed. As described above, when the identification code with “!” Is received, inverters other than the inverter number that matches the two-digit number following “!” Are designated as a group. In addition,
If the identification code is [! 00], the inverter [00]
The determination result in step P53 of the number-th slave station is K3, which is out of the specified range. If YES in step P54, the process shifts to step P56 where rxdN =
Since it is forcibly replaced by the smallest number next to [00], rxdN = [01], a reception confirmation return is performed from the slave station of the inverter [01]. Step P57 is a step of determining whether or not the identification code is omitted.

Sixth Embodiment (FIG. 12) A sixth embodiment will be described with reference to FIG. This embodiment has four slave stations A31 to A34, each of which has a first interface 20F and a second interface 21F, and one slave station A31 substitutes for the master station 8. It is configured as follows. In this case, each station has its first interface.
By connecting the first station 20F to the first transmission line 20, the same transmission and reception as described in FIG. 3 is performed between the master station substitute slave station A31 and the other slave stations a32 to A34.

Further, a predetermined one of the other slave stations a32 to A34 and the master station substitute slave station A31 are connected to the second transmission line 21 as a feedback communication network by the second second station.
Are connected by an interface 21. Therefore, in this embodiment, the function of the master station 8 of FIG. 2 is provided to the slave station A31, and the same operation as that of the embodiment shown in FIG. 1 is performed. Various information is fed back from one slave station via the second transmission line 21.

[0073]

According to the present invention, not only all broadcasts but also group broadcasts can be performed between the master station and the slave stations with respect to the control of the inverter. Can be returned. Moreover, the group designation includes a non-judgment symbol, a symbol representing “even number, odd number”,
This can be easily performed by using a symbol representing “the following” and a symbol representing “other” as part of the identification code.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining a first embodiment.

FIG. 2 illustrates an embodiment of the present invention, and is a block diagram illustrating a configuration of a communication network between a master station and a plurality of slave stations.

FIG. 3 is a block diagram of the communication device according to the embodiment;

FIG. 4 is an explanatory diagram showing a connection configuration between a master station and all slave stations in the embodiment.

FIG. 5 is a diagram showing a communication format.

FIG. 6 is a view corresponding to FIG. 1 showing a second embodiment.

FIG. 7 is a view corresponding to FIG. 1 showing a third embodiment.

FIG. 8 is a view corresponding to FIG. 1 showing a fourth embodiment.

FIG. 9 is a flowchart corresponding to FIG. 1 showing one flowchart with FIG. 8 to show the fourth embodiment;

FIG. 10 is a view corresponding to FIG. 1 showing a fifth embodiment.

FIG. 11 is a flowchart corresponding to FIG. 1 showing one flowchart with FIG. 10 to show the fifth embodiment;

FIG. 12 is a block diagram showing a sixth embodiment.

[Explanation of symbols]

1 is an electric motor, 2 is an inverter main circuit, 3 is an operation control unit,
4 is a communication unit, 5 is an inverter, 6 is a communication cable, 8 is a parent and child station, and A00 to A21 are child stations.

Claims (9)

[Claims] 1. A plurality of slave stations each including an inverter for driving and controlling an electric motor and a communication device, a master station connected to be able to transmit and receive information to and from the slave stations, and A communication system comprising an identification code determining means for determining whether or not the received information is specified by the own station from an identification code added to information received from the master station in the communication device, wherein the identification code is A first pattern composed of a plurality of digits, the code pattern of which is an individual code previously assigned to each slave station, a second pattern in which codes of all digits are replaced with non-determination codes, and some digits And a third pattern replaced with a non-determination symbol, and one of these patterns is selectively added to the transmission information.
In the first pattern, one slave station in which the individual codes of all digits match is specified, in the second pattern, all slave stations are specified, and in the third pattern, individual codes of digits other than the digits of the non-determination code are specified. A communication system for controlling a motor, wherein a slave station that matches each other is designated. 2. The identification code has a fourth pattern including even or odd designation symbols in some digits, and in the fourth pattern, an even number or an odd number corresponding to the designation symbol at a predetermined digit position. The communication system for controlling a motor according to claim 1, wherein a slave station having an individual code is designated. 3. The identification code has a fifth pattern including a specific symbol representing “less than” or “more than” and a numeral, and in the fifth pattern, an individual code of a number belonging to or more than the numeral is used. The motor control communication system according to claim 1, wherein a slave station having a code is configured to be designated. 4. The identification code has a sixth pattern including a specific symbol representing “other” and an individual code, and the sixth pattern specifies a slave station having a code other than the specific code. 2. The apparatus according to claim 1, wherein
3. The communication system for controlling a motor according to claim 1. 5. The identification code has a seventh pattern including a specific symbol indicating an operation state of the inverter, and a control unit in which, among the slave stations that have received the identification code, the inverter indicated by the specific symbol indicates the inverter indicated in the received information. The communication system for controlling an electric motor according to claim 1, wherein the communication is performed. 6. When a plurality of slave stations are specified at the same time by the identification code, a predetermined one of the slave stations is selected, and the slave station returns an incoming call to the master station. The electric motor control communication system according to any one of claims 1 to 5, wherein 7. The communication system for controlling a motor according to claim 6, wherein the predetermined one of the plurality of slave stations is a slave station having a minimum number as an individual code among a plurality of designated slave stations. . 8. The motor control communication system according to claim 1, wherein the master station is substituted by one slave station. 9. The motor control communication system according to claim 8, further comprising a feedback communication network for transmitting various information from one slave station other than the master station slave station to the master station slave station.