JPH103442A - Communication equipment and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a sequence program without being conscious of the bits and the characteristics of respective stations on a controller-side by realizing data communication adapted to the bits and the characteristics of the respective stations on a communication equipment-side. SOLUTION: In the communication equipment 3, the transmission rearrangement rule and a reception rearrangement rule of the bit units of the respective stations are stored in a transmission rearrangement table 13 and a reception rearrangement 12. At the time of transmitting data to the respective stations, data of transmission objects are rearranged in accordance with the transmission rearrangement rule of the transmission rearrangement table 13 so that they are arranged in a bit order which the respective stations operate. At the time of receiving data from the respective stations, data of reception objects are rearranged in accordance with the reception rearrangement rule of the reception rearrangement table 12 so that they are arranged in a bit order which the communication equipment 3 operates. At the time of communication with the communication equipment 3 in a CPU unit 1, data being the transmission object is transmitted and data which is rearranged by the reception rearrangement table 12 is received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus for performing data communication with each station connected to a network, and a communication system for performing communication control according to the bit arrangement characteristics of each station using the communication apparatus.

[0002]

2. Description of the Related Art For example, MAP (Manufacturing Automa
OSI (Op. Protocol) and PROFIBUS
In a network in which an application layer protocol of "en Systems Interconnection" is implemented, types such as an integer type, a floating point type, and a bit string type are strictly defined for data to be transmitted and received. For this reason, even if a plurality of vendor products are connected to the network like a multi-vendor network, data compatibility can be maintained between the products. In particular, in the bit string type, the order in which the received one-byte bit string is to be stored from the upper bit or the lower bit is strictly defined.

However, since the application layer protocol requires extremely complicated processing, there is a problem that the speed performance of the network is significantly reduced. For such reasons, FA (Factory Auto
In the field of mation), networks that do not implement application layer protocols are often used.

Here, an example of a conventional configuration will be described.
FIG. 19 is a diagram showing a network to which a communication device according to a conventional example is applied. In FIG. 19, reference numeral 101 denotes a CPU of a PC (Programmable Controller) which is a control device (not shown).
Unit, sequence program 102, PC communication device (not shown) 150, CPU unit 101
2-port memory for transferring data between the communication device 150 and the communication device 150; 152, a transmission data setting area in the 2-port memory 151; 153, a reception data setting area in the 2-port memory 151; A data transfer unit that mediates the unit 55.

[0005] Further, reference numeral 155 denotes a transmission / reception unit which controls transmission / reception of data to / from the digital input station 158 and digital output station 159 using the transceiver 156, and 156 denotes a transceiver which performs mutual conversion between data and physical signals. Fifteen
7 is a communication medium for physically connecting the communication device 150 to each digital input station 158 and digital output station 159 to transmit data, 158 is a digital input station from which the communication device 150 reads data via the communication medium 157, Reference numeral 159 denotes digital output stations to which the communication device 150 writes data via the communication medium 157.

In the above configuration, the CPU unit 10
1, when transmitting the transmission data to the communication device 150, the sequence program 102 writes the transmission data in the transmission data setting area 152, and conversely,
When receiving the reception data from 50, the reception data written in the reception data setting area 153 is read.
In the communication device 150, the data transfer unit 154
The transmission data written in the transmission data setting area 152 is read and passed to the transmission / reception unit 155.

[0007] The transmission / reception section 155 includes a data transfer section 15.
When the transmission data is received from the digital input station 158, the transceiver 156 controls the transceiver 156 to transmit the transmission data to the digital output station 159, or controls the transceiver 156 to receive the data from the digital input station 158 and passes the data to the transfer section 154. . The data transfer unit 154 writes the data received from the transmission / reception unit 155 as reception data in the reception data setting area 153. This reception data setting area 153
Is read by the sequence program 102 as described above.

Next, a specific communication example of the communication device 150 will be described. FIG. 20 is a diagram illustrating an example of data reception from the digital input station to the communication device 150. In FIG. 20, 158A and 158B denote digital input stations that handle data having different bit arrangement characteristics, respectively.
Reference numerals 60 and 161 denote received data having different bit arrangement characteristics.

FIG. 21 is a diagram showing an example of data transmission from the communication device 150 to the digital output station.
Numerals 59A and 159B denote digital output stations which handle data having different bit arrangement characteristics, and 162 and 163 denote transmission data having different bit arrangement characteristics. Digital input station 158A and digital output station 159
A handles data having the same bit arrangement characteristics (for example, the reception data 160 and the transmission data 162), and the digital input station 158B and the digital output station 159B have the same bit arrangement characteristics (for example, the reception data 160). 16
1 and transmission data 163).

The received data 159 and the received data 160 have the same contents, but have different bit arrangement characteristics from each other. The transmission data 162 and the transmission data 163 have the same contents, but have the same bit arrangement. Data with different characteristics. Here, the bit arrangement characteristics refer to the bit arrangement order.

First, data reception will be described. In the digital input station 158A, ON, ON, OFF, ON, O
FF and OFF are set. This digital input station 1
58A sets the signal "1" of the terminal 1 to the first bit (least significant bit) of the received data 160, and then sets the signal "1" of the terminal 2 to the second bit of the received data 160. , Terminals 1 to 6 are set in order from the lower bit to the upper bit, and
Create 0. Therefore, valid data is assigned to the lower 6 bits (first to sixth bits) of the received data 160, and is passed to the received data setting area 153 in that state.

In the digital input station 158B, FIG.
0, terminals 1 to 6 are ON,
ON, OFF, ON, OFF, OFF are set. Conversely, the digital input station 158B sets the signal “1” at the terminal 1 to the eighth bit (most significant bit) of the received data 161, and then sets the signal “1” at the terminal 2 to the seventh bit of the received data 161. Bits 1 to 3
The received data 161 is created by setting the signals up to the terminal 6 in order from the upper bit to the lower bit. Therefore, valid data is assigned to the upper 6 bits (3rd to 8th bits) for the received data 161.
In addition, even if the contents are the same as the received data 160, the bits are transferred to the received data setting area 153 in a state where the bit arrangement order is set in reverse.

Next, data transmission will be described. As shown in FIG. 21, the digital output station 159A transmits the transmission data 16 read from the transmission data setting area 152.
2 is output to the terminal 1 and then the second bit of the transmission data 162 is output to the terminal 2 so that the signal of the transmission data 162 is shifted from the lower bit to the upper bit. To the terminals 1 to 6 in this order. As a result, terminals 1 to 6 of the digital output station 162 have ON, ON, OFF, ON, OFF,
OFF is set.

Further, the digital output station 159B is provided as shown in FIG.
Conversely, the eighth bit (the most significant bit) of the transmission data 163 is output to the terminal 1 and then the seventh bit of the transmission data 163 is output to the terminal 2 in the same manner. The signal 163 is output to the terminals 1 to 6 in order from the upper bit to the lower bit. Therefore, the upper 6 bits of the transmission data 163 correspond to the terminals 1 to 6
, And the transmission order of the bits is opposite to that of the transmission data 162. As a result, the terminals 1 to 6 of the digital output station 163 are connected to the terminals 1 to 6 in the same manner as the setting of the terminals 1 to 6 of the digital output station 162, respectively.
N, ON, OFF, ON, OFF, and OFF are set.

As an approximation technique, see, for example,
Japanese Unexamined Patent Publication No. 22720 discloses a technique for transmitting data in land mobile radio data communication by reversing the order of data transmission with the most significant bit and the least significant bit. Other techniques for converting the bit order include Japanese Patent Application Laid-Open No. 4-288626.

[0016]

Since the conventional communication system is configured as described above, when data is received,
The received data 160 and 161 are written in the received data setting area 153 as they are without changing the order of the bits of the received data 160 and 161 in the communication device 150. In this case, in the digital input station 158A and the digital input station 158, the reception data 160 and 161 having different bit arrangement characteristics are written in the reception data setting area 153 although the same signal is input to the terminals. . Therefore, in the user, both received data 1
There is the inconvenience that the sequence program 102 must be created so that the arrangement characteristics of the 60 and 161 bits are matched.

In transmitting data, the communication device 150
Although the order of the bits of the transmission data 162 and 163 is not interchanged within the data, in order to accurately output the desired data to the terminal of the digital output station, the transmission data must be arranged in the order of the bits of the digital output stations 159A and 159B. It is necessary to match. Therefore, the user has to create the sequence program 102 so as to match the bit arrangement characteristics of the digital output stations 159A and 159B.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is a first object of the present invention to provide a communication device capable of realizing data communication adapted to the bit arrangement characteristics of each station. The purpose of.

Also, by realizing data communication adapted to the bit arrangement characteristics of each station on the communication device side, a communication system capable of creating a sequence program without considering the bit arrangement characteristics of each station on the control device side The second object is to obtain

[0020]

A communication apparatus according to the present invention stores a bit-by-bit arrangement characteristic corresponding to each station, and performs a bit-by-bit arrangement characteristic for each station during data communication with each station. The data to be communicated is converted according to.

In the communication apparatus according to the present invention, at the time of data communication, the data to be communicated is adapted to the bit arrangement characteristics of each station, so that data communication adapted to the bit arrangement characteristics of each station is realized. It becomes possible to do.

The communication apparatus according to the next invention stores a transmission rearrangement rule and a reception rearrangement rule in bit units corresponding to each station, and when transmitting data to each station, the transmission rearrangement rule for each station is stored. The bit order of the data to be transmitted is rearranged according to the rearrangement rules, and when receiving data from each station,
The bit order of the data to be received is rearranged according to the reception rearrangement rule for each station.

In the communication apparatus according to the present invention, the data to be transmitted is rearranged in a bit order handled by each station when transmitting data, and the data to be received is handled by each station when receiving data. The bit order rearranged from the bit order handled by the own device to the bit order handled by the own device, the bit order rearranged on the basis of the bit order handled in the own device, thereby realizing data communication adapted to the bit order of each station It becomes possible to do.

[0024] In the communication system according to the next invention, in the communication device, the bit-by-bit alignment characteristic is stored in correspondence with each station, and when performing data communication with each station, the bit-by-bit alignment characteristic for each station is stored. The control device transmits data to be rearranged by the communication device and receives the data rearranged by the communication device when communicating with the communication device.

In the communication system according to the present invention, the communication device adapts data to be communicated to the bit-wise arrangement characteristics of each station, and the control device only transmits and receives data to and from the communication device. Data communication adapted to the bit arrangement characteristics of each station is realized only on the communication device side, thereby eliminating the need for the control device to adapt data to the bit arrangement characteristics of each station for communication with each station. As a result, it becomes possible for the control device to create a sequence program without being aware of the bit arrangement characteristics of each station.

In the communication system according to the next invention, in the communication apparatus, a transmission rearrangement rule in units of bits and a reception rearrangement rule in units of bits are stored in correspondence with each station. Then, the data to be transmitted is rearranged according to the transmission rearrangement rule for each station so that the bit order handled by each station is used, and when data is received from each station, the bit order is handled by the communication device. The data to be received is rearranged in accordance with the reception rearrangement rule for each station, and the control device transmits the data to be rearranged by the communication device when communicating with the communication device, and rearranges the data by the communication device. Received data.

In the communication system according to the present invention, the communication device side rearranges the data to be transmitted so as to be in the bit order handled by each station, or changes the bit order handled by the communication device from the bit order handled by each station. Since the data is only sent to and received from the communication device on the control device side, the communication device realizes data communication adapted to the bit order handled by each station only on the communication device side. This eliminates the need for the control device to adapt to the bit order in which data is handled at each station. As a result, it becomes possible for the control device to create a sequence program without being aware of the bit arrangement order of each station.

In the communication system according to the next invention, the transmission rearrangement rule and the reception rearrangement rule for initialization are transmitted from the control device to the communication device, and the transmission rearrangement rule and the reception rearrangement rule in the communication device are set. initialize.

In the communication system according to the present invention, the transmission rearrangement rule and the reception rearrangement rule are initialized by the control device, so that the transmission rearrangement rule and the reception rearrangement rule of each station need to be initialized. It is only necessary to send the transmission rearrangement rule and the reception rearrangement rule for initialization from the control device to the communication device, and simple initialization of the transmission / reception rearrangement rule can be realized.

[0030]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, the basic configuration of the present embodiment will be described. FIG. 1 is a diagram showing a system configuration of a communication device and peripheral devices according to an embodiment of the present invention. In the figure, for example, reference numeral 1 denotes a C control device (not shown) of a PC.
A PU unit is shown, and controls a sequence to be controlled by communication with a communication device 3 described later. Reference numeral 2 denotes a sequence program created on the CPU unit 1. Reference numeral 3 denotes a PC communication device (not shown), which controls communication with a plurality of stations via a communication medium 18 described later.

4 is provided in the communication device 3 and has a CPU
2 for transferring data between the unit 1 and the communication device 3
Port memory, 5 for firmware, 6 for RAM, 17
Is a transceiver for converting between a physical signal transmitted to the communication medium 18 and transmitted / received data, and 18 is a communication device 3
And a communication medium for physically connecting a digital input / output station (not shown) and transmitting data.

In the firmware 5, a communication order management unit 7 manages the execution order of the reception rearranging unit 8, the transmission rearranging unit 9, and the table initialization unit 10 and the execution thereof. Rearranging the bit order of the received data with reference to the data of the conversion table 12,
After that, the reception rearranging unit 9 that passes the rearranged reception data to the sequence program 2 refers to the data of the transmission rearrangement table 13 described later to rearrange the bit order of the transmission data passed from the sequence program 2. After that, the transmission rearrangement unit that passes the rearranged transmission data to the transmission / reception unit 11, a table initialization unit that initializes a reception rearrangement table 12 and a transmission rearrangement table 13, which will be described later, and 11 transmits the transceiver 17. The transmission / reception units that control the transmission / reception of data by using them are shown.

In the RAM 6, reference numeral 12 denotes a reception rearrangement table for storing data indicating a rearrangement rule of bits of reception data, 13 denotes a transmission rearrangement table for storing a rearrangement rule of bits of transmission data, and 14 denotes a reception rearrangement table. A reception rearrangement buffer used by the rearrangement unit 8 as a work area for rearranging bits, a transmission rearrangement buffer 15 used by the transmission rearrangement unit 9 as a work area for rearrangement of bits, and 16 is a transmission rearrangement buffer. Rearranger 9
And a temporary buffer used by the reception rearranging unit 8 to temporarily copy transmission / reception data.

Next, a specific configuration example of the communication device 3 will be described. FIG. 2 is a block diagram showing an example of a hardware configuration in the communication device 3 in the system configuration shown in FIG. In the figure, a communication device 3 electrically connects a connector 20 and a connector 21 to a CPU unit 1 and a communication medium 18, respectively, and exchanges data with the outside via the connectors 20 and 21.

The communication device 3 transmits data received from the connector 20 to the internal bus 41 via the two-port memory 4, and transmits data transmitted to the bus 41 to the connector 20 via the two-port memory 4. To send to. Similarly,
The communication device 3 transmits data received from the connector 21 to the internal bus 41 via the transceiver 17,
The data transmitted to the bus 41 is transmitted to the connector 21 via the transceiver 17.

A CPU 40 controls the operation of the entire communication device 3 according to a program, and is connected to a bus 41. This CPU 40 has a ROM 1
9, a two-port memory 4 coupled to the bus 41 in accordance with various programs of the firmware 5 stored in the
M6, ROM 5, and transceiver 17 are controlled.

In the firmware 5 shown in FIG.
Reference numeral 20 denotes a communication order management program, 21 denotes a transmission rearrangement program, 22 denotes a reception rearrangement program, 23 denotes a transmission / reception program, and 24 denotes a table initialization program. With respect to the firmware 5 shown in FIG.
And a CPU that executes the communication order management program 20
40 is realized by a configuration in which C.40 is combined. The transmission rearrangement unit 9 is realized by a configuration in which a transmission rearrangement program 21 and a CPU 40 that executes the transmission rearrangement program 21 are combined.

The reception rearranging section 8 is realized by a configuration in which a reception rearranging program 22 and a CPU 40 that executes the reception rearranging program 22 are combined. The transmission / reception unit 11 is realized by a configuration in which a transmission / reception program 23 and a CPU 40 that executes the transmission / reception program 23 are combined. The table initialization unit 10 is realized by a configuration in which a table initialization program 24 and a CPU 40 that executes the table initialization program 24 are combined.

In the RAM 6 shown in FIG. 2, reference numeral 42 denotes a work area used when executing various programs of the firmware 5.

Next, the two-port memory 4 will be described in detail. FIG. 3 is a diagram showing a memory structure of the two-port memory 4. In the figure, 22 is a sequence program 2
A handshake area for performing a handshake of initialization between the firmware and the firmware 5, a transmission rearrangement data setting area 23 for setting a transmission data rearrangement rule, a reception rearrangement data setting area 24 for setting a reception data rearrangement rule, Reference numeral 25 denotes a transmission data area for setting data to be transmitted by the sequence program 2, and reference numeral 26 denotes a reception data area for setting received data by the firmware 5.

The transmission rearrangement data setting area 23 includes transmission rearrangement data setting areas for a plurality of stations.
For example, 27 is the transmission rearrangement data setting area of the first station, 28 is the transmission rearrangement data setting area of the nth station (n is a natural number), and 29 is the transmission rearrangement data of the Mth station (M is a natural number, M ≧ n). Each of the changed setting areas is shown. The transmission rearrangement setting area of each station includes a rearrangement data setting area of each bit of transmission data transmitted by each station. For example, SS [n] [1] is the transmission rearrangement data setting area of the first bit of the n-th station, SS [n]
[2] indicates a transmission rearrangement data setting area of the n-th station second bit, and SS [n] [K] (K is a natural number) indicates a transmission rearrangement data setting area of the n-th station Kth bit.

The reception rearrangement data setting area 24 includes a reception rearrangement data setting area for a plurality of stations.
For example, 30 is a reception rearrangement data setting area of the first station, 31 is an reception rearrangement data setting area of the nth station, 3
Reference numeral 2 denotes setting areas in which the reception rearrangement of the M-th station has been performed. And the reception rearrangement setting area of each station is
It consists of a rearranged data setting area for each bit of the received data received by each station. For example, RS [n] [1]
Is the reception rearrangement data setting area of the n-th station first bit,
RS [n] [2] indicates a reception rearrangement data setting area for the n-th station second bit, and RS [n] [K] indicates a reception rearrangement data setting area for the n-th station Kth bit.

The transmission data area 25 is composed of transmission data areas of a plurality of stations. For example, SD [1] is the first
The transmission data area of the station, SD [2] is the transmission data area of the second station, SD [n] is the transmission data area of the nth station, S
D [M] indicates a transmission data area of the Mth station. The transmission data area 26 includes reception data areas of a plurality of stations. For example, RD [1] is the reception data area of the first station, RD [2] is the reception data area of the second station, RD [n] is the reception data area of the nth station, RD
[M] indicates the reception data area of the Mth station.

Regarding the relationship between the above-mentioned areas, first,
The transmission rearrangement data setting area of each station will be described. FIG. 4 is a diagram for explaining a bit rearrangement rule in the transmission rearrangement data setting area. In FIG. 4, reference numeral 34 denotes n-th station transmission data consisting of K bits transmitted to the communication medium 18.

In the transmission rearrangement setting area of each station, a rearrangement position in bit units with respect to data (K bits) stored in the transmission data area of each station is defined. FIG. 4 shows a bit rearrangement rule defined by the transmission rearrangement data setting area 28 of the n-th station. That is, when each bit of the transmission data area SD [n] of the n-th station is transmitted to the communication medium 18, it is set in the transmission rearrangement data setting areas SS [n] [1] to SS [n] [K]. The value specifies which bit position each bit must be reordered and transmitted in order to match the bit alignment characteristics of each station. For example, in the transmission rearrangement data setting area 28, since the value “3” is stored in the transmission rearrangement data setting area SS [n] [1] of the first bit of the n-th station, the rearrangement position is the third. Bit.

Therefore, the transmission data area SD of the n-th station
The value of the first bit of the data stored in [n] is rearranged to the position of the third bit of the n-th station transmission data 34. Similarly, since the value of the transmission rearrangement data setting area SS [n] [i] of the i-th (i is a natural number, K ≧ i) bit is defined as “2”, the transmission data area SD of the n-th station is defined. The i-th bit of [n] is rearranged to the position of the second bit of the n-th station transmission data 34. In this manner, the K-bit data in the transmission data area SD [n] of the n-th station is rearranged in accordance with the rules of the transmission rearrangement data setting area 28 of the n-th station, and finally the data is rearranged. As shown in FIG. 4, the n-th station transmission data 34 is obtained. This n-th
The station transmission data 34 is transmitted from the 2-port memory 4 to the bus 41,
Communication medium 18 via transceiver 17 and connector 21
Is the data transmitted to

Next, the reception rearrangement data setting area of each station will be described. FIG. 5 is a diagram for explaining the bit rearrangement rule of the reception rearrangement data setting area. In FIG. 5, reference numeral 36 denotes n-th station reception data consisting of K bits received from the communication medium 18.

In the reception rearrangement setting area of each station, a rearrangement position in bit units for data (K bits) stored in the reception data area of each station is defined. FIG. 5 shows a bit rearrangement rule defined by the reception rearrangement data setting area 31 of the n-th station. That is, the reception rearrangement data setting area RS [n] [1] to
The value set in RS [n] [K] is based on the bit position of the bit in the reception data area RD [n] of the n-th station that was originally set in the reception data 36 of the n-th station. Is specified. For example, in the reception rearrangement data setting area 31, since the value “3” is stored in the reception rearrangement data setting area RS [n] [1] of the first bit of the n-th station, the original bit position is It becomes 3 bits.

Therefore, the reception data area RD of the n-th station
The value of the first bit of the data stored in [n] is originally the position of the third bit of the n-th station received data 36. Similarly, the ith bit reception rearrangement data setting area RS
Since the value of [n] [i] is defined as “2”, the n-th
The i-th bit of the reception data area RD [n] of the station is originally the position of the second bit of the n-th station reception data 36. As described above, the data in the reception data area RD [n] of the n-th station is based on the reception rearrangement data setting area 31 of the n-th station, and the data of the n-th station reception data 36 shown in FIG. It is a sequence of bits. The n-th station received data 36 is transmitted from the communication medium 18 to the connector 21, the transceiver 17, the bus 4
1 is the data received by the 2-port memory 4 via

As described above, the data in the reception rearrangement data setting area 31 of the n-th station is stored in the reception data area R of the n-th station.
When each bit of D [n] is transmitted from the n-th station to the two-port memory 4 via the communication medium 18, it specifies which bit position was originally set. On the other hand, in the data of the transmission rearrangement data setting area 28 of the n-th station, each bit of the n-th station transmission data area SD [n] is 2 bits.
When transmitting to the n-th station from the port memory 4 via the communication medium 18, the bit position is specified.

According to these rules, the bit arrangement standard is the n-th station transmission data area SD on the two-port memory 4.
[N], and the order of each bit of the n-th station reception data area RD [n]. Therefore, the data in the transmission rearrangement data setting area 28 of the n-th station is stored in the n-th station transmission data area SD.
Since the rearrangement of the bits of [n] is specified, the bit arrangement of the n-th station transmission data 34 is the order of the bits rearranged at the time of transmission.

On the other hand, the data in the reception rearrangement data setting area 31 of the n-th station is the reception data area RD [n] of the n-th station.
Since the order of the original bits of the data of
The bit arrangement of the station reception data 36 is the original bit order at the time of reception. Here, the example of the n-th station has been described, but the transmission / reception data is also defined for the other first to M-th stations based on the same bit arrangement standard.

Next, the transmission rearrangement table 13 of the RAM 6 will be described in detail. FIG. 6 shows the transmission rearrangement table 1.
3 is a diagram showing a memory structure of No. 3; FIG. The transmission rearrangement table 13 shown in FIG.
It stores data that specifies the rearrangement position for each bit from the bit to the K-th bit, and the address of each data is a two-dimensional array in which the station numbers in the horizontal axis correspond to the bit numbers in the vertical direction. Has become.

The transmission rearrangement table 13 defines the same bit rearrangement position as the transmission rearrangement data setting area of each station in the two-port memory 4 described above. Therefore, in the transmission rearrangement table 13, for example, in the case of the n-th station, the data in the transmission rearrangement data setting area 28 is copied as it is. When transmitting each bit of the n-th station transmission data area SD [n] to the communication medium 18, an area ST [n] of the n-th station table in which data exactly the same as the transmission rearrangement data setting area 28 is copied.
[1] to ST [n] [K] are referred to.

Therefore, the n-th station transmission data area SD
When the data of [n] is transmitted to the communication medium 18, for example, for the i-th bit, the area S of the n-th station table
It indicates to which bit the data of T [n] [i] should be rearranged.

Next, the reception rearrangement table 12 of the RAM 6 will be described in detail. FIG. 7 shows the reception rearrangement table 1.
2 is a diagram illustrating a memory structure of FIG. The reception rearrangement table 12 shown in FIG. 7 stores the first
It stores data that specifies the rearrangement position for each bit from the bit to the K-th bit, and the address of each data is a two-dimensional array in which the station numbers in the horizontal axis correspond to the bit numbers in the vertical direction. Has become.

While the reception rearrangement data setting area of each station in the 2-port memory 4 defines the original bit position of each bit of the reception data area, the reception rearrangement table 12 receives the reception data. It specifies which bit position in the data area should be rearranged. When each bit of the n-th station reception data is received from the communication medium 18, the area RT [n] [1] of the n-th station table is used.
ＲＴRT [n] [K] are referred to. Therefore, the data in the area RT [n] [i] of the table for the n-th station corresponds to the bit i in the reception data area RD [n] in the n-th station received data 36 received from the communication medium 18. Tells you if you should sort them. Further, a specific example will be described with reference to FIG.

FIG. 8 is a diagram for explaining a bit rearrangement rule of the reception rearrangement table 12. In FIG.
Indicates an n-th station table. The n-th station table 37 includes areas RT [n] [1] and RT [n] [2].
... RT [n] [i]... RT [n] [K] with data “K”, “i”.
1 "is stored.

For example, the area R of the n-th station table 37
The data of T [n] [1] specifies which bit position in the n-th station reception data area RD [n] the first bit of the n-th station reception data 36 should be rearranged. Therefore, in the n-th station table 37 shown in FIG. 8, since the data “K” is stored in the area RT [n] [1], the first bit of the n-th station reception data 36 is the n-th station reception data. It will be rearranged to the K-th bit of the data area RD [n]. Similarly, since data “3” is stored in the area RT [n] [i], the i-th bit of the n-th station reception data 36 is the third bit of the n-th station reception data area RD [n].
Will be sorted into bits.

As described above, in the case of the reception rearrangement data setting area 31 of the n-th station shown in FIG. 5, the reference of the bit arrangement is the bit order of the reception data area RD [n] of the n-th station. However, in the case of the n-th station table 37 shown in FIG. 8, the bit arrangement is based on the bit order of the n-th station received data 36. Due to this difference, in the case of the reception rearrangement table 12, it is necessary to initialize the data in the n-th station reception rearrangement data setting area 31 with the converted data in the n-th station table 37.

Next, the transmission rearrangement buffer 15, the reception rearrangement buffer 14, and the temporary buffer 16 will be described.

FIG. 9 is a diagram showing a memory structure of the transmission rearrangement buffer 15. In FIG. 9, SB [1], SB [1]
[2], SB [3] ... SB [i] ... SB [K]
Are the first bit of the transmission rearrangement buffer 15, respectively.
2nd bit, 3rd bit ... i-th bit ... K-th bit are shown. The transmission rearrangement buffer 15 illustrated in FIG. 9 includes the first bit SB [1] to the K-th bit SB [K]
This stores up to K bits of data, and is used by the transmission rearrangement unit 9, that is, the CPU 40 operating according to the transmission rearrangement program 21.

FIG. 10 is a diagram showing the memory structure of the reception rearrangement buffer 14. In FIG. 10, RB [1], R
B [2], RB [3] ... RB [i] ... RB
[K] indicates a first bit, a second bit, a third bit,..., An i-th bit,..., A K-th bit of the reception rearrangement buffer 14, respectively. The reception rearrangement buffer 14 shown in FIG. 10 includes the first bit RB [1] to the K-th bit RB
It stores K bits of data up to [K], and is used by the reception rearrangement unit 8, that is, the CPU 40 that operates according to the reception rearrangement program 22.

FIG. 11 is a diagram showing the memory structure of the temporary buffer 16. In FIG. 11, TB [1], TB [1]
[2], TB [3] ... TB [i] ... TB [K]
Indicate the first bit, second bit, third bit,..., I-th bit,..., K-th bit of the temporary buffer 16, respectively. Temporary buffer 1 shown in FIG.
Numeral 6 temporarily stores K-bit data from the first bit TB [1] to the K-th bit TB [K], and is used by the transmission rearrangement unit 9 and the reception rearrangement unit 8. .

Next, the operation will be described. FIG. 12 is a flowchart illustrating the communication order management process. This communication order management process is performed by the CPU unit 1 executing the sequence program 2 and the communication order management program 20.
2 shows an operation in cooperation with the CPU 40 of the communication device 3 that executes the operation.

First, when activating the sequence program 2, the CPU unit 1 waits until "1" is written in the handshake area 22 (step S100).
When activating the communication order management program 20, the CPU 40 writes a default value in the two-port memory 4 and initializes it (S109). Here, the default value is the transmission data rearrangement data setting area 2 of the two-port memory 4.
This means that data that does not change the bit order at all is set in the reception rearrangement data setting area 24 as 3 and that 0 is written in all other areas. That is, in FIG.
A value satisfying [n] [i] = i (1 ≦ i ≦ K, 1 ≦ n ≦ M) is heard, and R is set in the reception rearrangement data setting area 24.
A value that satisfies S [n] [i] = i (1 ≦ i ≦ K, 1 ≦ n ≦ M) is written, and 0 is written to other areas to initialize.

After that, the CPU 40
Then, it waits until a valid value "2" is written in the transmission rearrangement data setting area 23 and the reception rearrangement data setting area 24 (step S111).

When the CPU 40 confirms that "1" has been written into the handshake area 22 by the CPU 40 (step S100), the transmission rearrangement data setting area 23 and the reception rearrangement data setting area 24
Then, the rearranged data is written as shown in FIG. 3 (step S101). Further, the CPU unit 1
“2” is written in the handshake area 22 to notify the CPU 40 of the completion of the setting of the rearrangement data (step S
102), wait for the CPU 40 to initialize the transmission rearrangement table 13 and the reception rearrangement table 12; If it is not necessary to change the initial value written by the communication order management program 20 in step S109,
U unit 1 is transmission data rearrangement data setting area 2
It is sufficient to write “2” in the handshake 22 without changing the value of the reception rearrangement data setting area 24 to 3.

When the CPU 40 confirms that “2” has been written into the handshake area 22 by the CPU unit 1 (step S111), the CPU 40 activates the table initialization program 24 and transmits the transmission rearrangement table 13 and the reception rearrangement table. 12 (Step S1)
12). The table initialization process (see FIG. 14) by the table initialization program 24 will be described later. When the initialization is completed in this way, the CPU 40 writes “3” in the handshake area 22 and notifies the CPU unit 1 of the completion of the initialization (step S11).
3).

The CPU unit 1 includes a CPU 40
When it is confirmed that "3" has been written in the handshake area 22 (step S103), the transmission data is written in the transmission data area 25 (step S10).
4) Further, after writing "4" in the handshake area 22, the communication start is notified to the CPU 40 (step S105).

When the CPU 40 confirms that "4" has been written in the handshake area 22 by the CPU unit 1 (step S114), it writes "1" in the station number variable n set in the work area 42 (step S114).
115).

Further, the CPU 40 specifies the n-th station according to the station number variable n, and then executes the transmission rearrangement program 2
1, the transmission data area SD [n] is rearranged, and a transmission rearrangement process is executed (step S116). Similarly, the n-th station is designated, and then the reception rearrangement program 22 is started, and the reception data area SD [n] is activated. RD [n] is rearranged to execute the reception rearrangement process (step S117). In addition,
The transmission rearrangement processing (see FIG. 16) and the reception rearrangement processing (see FIG. 18) will be described later.

Thereafter, the CPU 40 increments the station number variable n by one (step S118), and determines whether the value of n is equal to or less than the maximum value M, that is, the communication from the first station to the maximum M-th station is completely completed. It is determined whether or not it has been performed (step S119). As a result, when it is determined that the communication has not been completely completed, the process jumps to step S116, and executes communication with the n-th station, which is incremented by one in step S118.

If it is determined in step S119 that the n value exceeds the maximum value M, that is, if it is determined that the communication from the first station to the maximum Mth station has been completed, the process proceeds to step S114. To monitor the value of the handshake area 22. At this time, if the handshake area 22 is held at the value “4” (Step S114), the CPU 40 returns to Step S114.
Communication is continued by repeating the processing from 115 to step S119.

If the value of the handshake area 22 has been rewritten to "2" (step S11)
4) Since the rewriting indicates that the reordering of the transmission rearrangement table 13 and the reception rearrangement table 12 has been instructed by the CPU unit 1, the processing jumps to step S112, and the table initialization program 24 is again executed. to start.

Returning to the processing of the CPU unit 1,
After writing “4” in the handshake area 22 (step S105), the CPU unit 1 writes the transmission data in the transmission data area 25 (step S10).
6) The communication is performed by reading the received data from the received data area 26 (step S107).

Thereafter, if the transmission rearrangement table 13 and the reception rearrangement table 12 need to be initialized again (step S108), the process jumps to step S101, and instructs the CPU 40 to initialize again. On the other hand, if the initialization is not necessary again (step S10
8) The process jumps to step S106, and continues the communication processing of steps S106 and S107.

Next, the table initialization processing in step S112 will be described in detail. FIG. 13 is a diagram for explaining a method of initializing the reception rearrangement table 13. In the transmission rearrangement table 13, the data in the transmission rearrangement data setting area 23 of the two-port memory 4 can be copied and initialized as it is, but in the reception rearrangement table 12, the reception rearrangement is performed at the time of initialization. It is necessary to perform a predetermined conversion process without directly copying the data in the data setting area 24.

FIG. 13 shows a method of creating (initializing) the n-th station table 37 by converting the data arrangement in the transmission rearrangement data setting area 31 of the n-th station.
Reception rearrangement data setting area RS [n] [1] to RS
[N] [K] and area RT of the n-th station table 37
[N] [1] to RT [n] [K] have a relationship in which the second subscript and data are exchanged. For example, in the case of the reception rearrangement data setting area RS [n] [1], the second subscript is “1” and the data is “3”. In the office table 37, the second subscript is "3" and the data is "1".

As a result, the data in the area RT [n] [3] of the n-th station table 37 becomes “1”. Similarly, since the data of the reception rearrangement data setting area RS [n] [i] is “2”, if the second subscript and the data are exchanged, the area RT [n] in the n-th station table 37 is obtained.
[2] The data becomes “i”. Thus, the reception rearrangement data setting areas RS [n] [1] to RS [n]
By exchanging the second subscript and data for all of [K], the initialization of the n-th station table 37 is completed. The operation related to the initialization process is executed according to a table initialization program 24 described later.

Next, a specific operation of the initialization processing will be described. FIG. 14 is a flowchart illustrating the initialization process. This initialization processing is performed by the initialization processing program 2
4 shows the operation by the CPU 40 of the communication device 3 that executes Step 4. In FIG. 14, i indicates a second subscript variable for setting (storing) the second subscript of the reception rearrangement data setting area 24 in the work area 42, and x indicates the work area 4
2 shows an area for setting (storing) data in the reception rearrangement data setting area 24.

When the processing shifts to the initialization processing, the CPU 4
0 first copies the data in the transmission rearrangement data setting area 23 as it is to the transmission rearrangement table 13 (step S130). Next, the CPU 40 determines the station number variable n.
Is written to the memory (step S131), and whether the n value is equal to or less than the maximum value M, that is,
It is determined whether the initialization up to the station has been completed (step S132).

As a result, if it is determined that the initialization has not been completely completed, the process proceeds to step S
The flow shifts to 133, where "1" is written into the second subscript variable i.
Thereafter, the process proceeds to step S134, and if the i value is equal to or less than the maximum value K, that is, from the first bit to the Kth
It is determined whether the exchange of the second subscript up to the bit and the data has been completed. If it is determined in step S132 that the initialization has been completed, the initialization process is terminated, and the process returns to the communication order management process of FIG.

If it is determined in step S134 that the exchange has not been completely completed, the process proceeds to step S135, in which the reception rearrangement data setting area RS [n] [1] is set. It is determined whether the data is "0". In this case, since the data is "3",
In step S135, it is determined that the data is not "0".

Thereafter, the processing shifts to step S136. The CPU 40 controls the reception rearrangement data setting area RS
The data “3” of [n] [1] is stored in the area x (step S136), and the value “1” of the second subscript variable i is stored in the area R
It is stored in T [n] [x], that is, in the area RT [n] [3] (step S137).

As described above, steps S136 and S137
Then, between RS [n] [i] and RT [n] [x],
An exchange between the second subscript and data is performed. If it is determined in step S134 that the data is "0", the value "0" is determined not to be a valid value in the present process, and the process is performed to exchange the next data. Jump to step S138.

When the process proceeds to step S138, the CPU 40 increments the i value by one (step S138), and sets RS [n] [i] and RT again.
[N] [x], the second subscript “2” and the data “4”
(Steps S134 to S13)
7). The exchange processing from step S134 to step S137 is repeatedly performed up to the last K-th bit.

Thereafter, when the exchange processing up to the last K-th bit is completed, the i value reaches “K + 1” (step S138), and it is confirmed in step S134 that the i value has exceeded the maximum value K. In this case, in order to start the exchange processing of the next station, that is, the second station, the next step S13
At 9, the value "1" of the station number variable n is incremented by one to become a value "2". Then, the process jumps again to step S132, and the above-described steps S132 to S132 are performed.
The initialization for the second stations up to 38 is repeatedly executed.

As described above, even after the initialization for the second station, the initialization for the third, fourth,..., Mth stations is sequentially performed while incrementing the station number variable n one by one. When the initialization for the Mth station is completed,
Since the n value reaches “M + 1” (step S139),
In step S132, it is confirmed that the n value has exceeded the maximum value M. In this case, since the initialization of the reception rearrangement table 12 has been completed, the process returns to the communication order management process of FIG. Thus, the initialization of the transmission rearrangement table 13 and the reception rearrangement table 13 is completed.

Next, the transmission rearrangement process in step S116 will be described in detail. FIG. 15 is a diagram for explaining the rules of the transmission rearrangement process. In FIG. 15, reference numeral 38 denotes a table for the n-th station of the transmission rearrangement table 13,
j (j is a natural number) indicates a second subscript variable for setting (storing) the second subscript of the transmission rearrangement table 13 in the work area 42.

When transmitting the data in the n-th station transmission data area SD [n] to the communication medium 18, for example, for the j-th bit, the area ST [n] of the n-th station table 38
It indicates to which bit the data of [j] should be rearranged. If all bits of the transmission rearrangement buffer 15 have been initialized to "0", the n-th station transmission data area SD is referred to while referring to the n-th station table 38.
Of the data of [n], only the bit positions storing data "1" are rearranged.

In FIG. 15, the first, third, fourth, K-2, and K-th transmission rearrangement data setting areas SD [n] are shown.
Since data “1” is set in each bit,
The data at these five bit positions are to be rearranged. For example, the first of the n-th station transmission data area SD [n]
The bit stores data "1". The first bit to be rearranged is stored in the n-th station table 38.
Area ST [n] [1] is referred to. Since the data of this area [n] [1] is “3”, data “1” is written to the third bit SB [3] of the transmission rearrangement buffer 15.

That is, data “1” is rearranged from the first bit of the n-th station transmission data area SD [n] to the third bit SB [3] of the transmission rearrangement buffer 15.
Similarly, the data of the third bit of the n-th station transmission data area SD [n] is "1". In this case, the data of the area ST [n] [3] of the n-th station table 38 is "j". Therefore, the j-th bit SB of the transmission rearrangement buffer 15
Data “1” is written to [j].

Also, the n-th station transmission data area SD [n]
The data "0" is stored in the second bit. In this case, the area ST [n] [2] of the n-th station table 38
Is "4", the data "0" may be stored in the fourth bit SB [4] of the transmission rearrangement buffer 15, but as described above, the transmission rearrangement buffer 15 is initialized to "0". If they have been stored, the storing process is unnecessary.

Next, a specific operation of the transmission rearrangement process will be described. FIG. 16 is a flowchart illustrating the transmission rearrangement process. This transmission rearrangement processing is performed by the CPU of the communication device 3 that executes the transmission rearrangement program 21.
The operation by reference numeral 40 is shown. In FIG. 16, y indicates an area in the work area 42 in which data of the transmission rearrangement table 13 is set (stored).

When the processing shifts to the transmission rearrangement processing, C
The PU 40 firstly transmits the n-th station transmission data area SD [n].
Is directly copied to the temporary buffer 16 (step S150). Next, the CPU 40 initializes the data of the transmission rearrangement buffer 15 to all bits “0” (step S151), and sets “1” to the second subscript variable j.
Is written (step S152). The value written to the second subscript variable j indicates the bit position of the temporary buffer 16 where data is temporarily copied in the transmission rearrangement processing.

Subsequently, the processing shifts to step S153 to determine whether or not the j value is equal to or less than the maximum value K, that is, whether or not the transmission rearrangement from the first bit to the maximum K-th bit has been completed. I do. As a result, if it is determined that the transmission rearrangement is not completely completed,
The processing shifts to step S154, where the j-th bit TB [j] of the temporary buffer 16, that is, the first bit TB
The value of [1] is determined.

The value of the first bit TB [1] is "1" because the first bit data of the n-th station transmission data area SD [n] is copied. Therefore, as a result of the determination, the value of the first bit TB [1] becomes "1" (step S154), and in the subsequent step S155, the area ST [n] [j] of the n-th station table 38, that is, ST [n]. The data “3” of [1] is written to the area y.

Subsequently, the data (y value) written to the area y is determined (step S156). If the y value is other than "0", the y value is regarded as a value effective for the transmission rearrangement process. Is determined. In this case, since the y value is "3", it becomes a valid value (step S156), and the process proceeds to the next step S157, where the transmission rearrangement buffer 1
5, the y-th bit SB [y], that is, the third bit SB
Write "1" to [3].

In step S154, if the value of the j-th bit TB [j] of the temporary buffer 16 is "0", all the bits of the transmission rearrangement buffer 15 have been initialized to "0". Therefore, there is no need to manipulate the bits of the transmission rearrangement buffer 15 as described with reference to FIG. Therefore, the process jumps to step S158 without doing anything. If the y value is “0” in step S156, the y value is determined to be invalid for the transmission rearrangement process, and the process jumps to step S158.

When the processing shifts to step S158, the CPU 40 increments the j value by one (step S158).
(Step S153 to step S157). This step S15
The transmission rearrangement from 3 to step S157 is repeatedly performed up to the last K-th bit. Then the last K-th
When the transmission rearrangement up to the bits is completed, the j value becomes “K +
1 ”(step S158), so that step S1
At 53 it is confirmed that the j value has exceeded the maximum value K.

In this case, since the transmission rearrangement processing using the transmission rearrangement buffer 15 for the n-th station has been completed, the processing shifts to step S159 to transmit and receive the data in the transmission rearrangement buffer 15. Program 2
Then, the process returns to the communication order management process of FIG. In this way, the CPU 40 sends the transmission rearrangement buffer 1 according to the transmission / reception program 23.
5 is transmitted to the n-th station via the communication medium 18.

Next, the reception rearrangement process in step S117 will be described in detail. FIG. 17 is a diagram for explaining the rules of the reception rearrangement process. In the figure, k (k
Indicates a second subscript variable for setting (storing) the second subscript of the reception rearrangement table 12 in the work area 42. If all the bits of the reception rearrangement buffer 14 have been initialized to “0”, while referring to the n-th station table 37 of the reception rearrangement table 12,
Only the bit positions storing the data “1” in the n-th station received data 36 are rearranged.

In FIG. 17, since data "1" is set in the first, third, k-th, K-2, and K-1 bits of the n-th station reception data 36, these five bits are set. The data at the position is to be rearranged. For example, the n-th
Data "1" is stored in the first bit of the station reception data 36. For the first bit to be rearranged, the area RT [n] [1] of the n-th station table 37 is referred to. . The data of this area [n] [1] is "K"
Therefore, the K-th bit RB of the reception rearrangement buffer 14
Data [1] is written to [K].

That is, data “1” is rearranged from the first bit of the n-th station reception data 36 to the K-th bit SB [K] of the reception rearrangement buffer 14. Similarly, the n-th
The data of the third bit of the station reception data 36 is also "1". In this case, the area RT of the n-th station table 37
Since the data of [n] [3] is “1”, data “1” is written to the first bit RB [1] of the reception rearrangement buffer 14.

[0107] Data "0" is stored in the second bit of the n-th station received data 36. In this case, since the data in the area RT [n] [2] of the n-th station table 37 is “k”, the data “0” may be stored in the k-th bit RB [k] of the reception rearrangement buffer 14. As described above, when the reception rearrangement buffer 14 has been initialized to "0", the storing process is unnecessary.

Next, a specific operation of the transmission rearrangement process will be described. FIG. 18 is a flowchart illustrating the transmission rearrangement process. This transmission rearrangement processing is performed by the CPU of the communication device 3 that executes the reception rearrangement program 22.
The operation by reference numeral 40 is shown. In FIG. 18, z (z
Is a natural number) indicates an area in the work area 42 in which data of the reception rearrangement table 12 is set (stored).

When the processing shifts to the reception rearrangement processing, C
The PU 40 copies the n-th station received data 36 received first according to the transmission / reception program 23 as it is to the temporary buffer 16 (step S170). Next,
The CPU 40 initializes the data in the reception rearrangement buffer 14 to all bits “0” (step S171), and
"1" is written into the subscript variable k (step S172).
The value written to the second subscript variable k indicates the bit position of the temporary buffer 16 for temporarily copying data in the reception rearrangement process.

Subsequently, the processing shifts to step S173 to determine whether or not the k value is equal to or less than the maximum value K, that is, whether or not the reception rearrangement from the first bit to the maximum Kth bit has been completed. I do. As a result, if a determination result that the reception rearrangement is not completely completed is obtained,
The process proceeds to step S174, where the k-th bit TB [k] of the temporary buffer 16, that is, the first bit TB
The value of [1] is determined.

The value of the first bit TB [1] is “1” because the data of the first bit of the n-th station received data 36 is copied. Therefore, as a result of the judgment,
The value of the first bit TB [1] becomes “1” (step S
174) In the following step S175, the area RT [n] [k] of the n-th station table 37, that is, RT [n]
The data “K” of [1] is written to the area z.

Subsequently, the data (z value) written in the area z is determined (step S176). If the z value is other than "0", the z value is regarded as a value effective for the reception rearrangement process. Is determined. In this case, since the z value is “K” (maximum value), it becomes a valid value (step S176), and the process proceeds to the next step S177, where the z-th bit RB [z] of the reception rearrangement buffer 14, ie, the K-th bit Write "1" to RB [K].

In step S174, if the value of the k-th bit TB [k] of the temporary buffer 16 is "0", all the bits of the reception rearrangement buffer 14 have been initialized to "0". Therefore, there is no need to manipulate the bits of the reception rearrangement buffer 14 as described with reference to FIG. Therefore, the process jumps to step S178 without doing anything. If the z value is “0” in step S176, the z value is determined to be invalid for the reception rearrangement process, and the process jumps to step S178.

When the process proceeds to step S178, the CPU 40 increments the k value by one (step S178).
(Step S173 to step S177). This step S17
The reception rearrangement from 3 to step S177 is repeatedly performed up to the last K-th bit. Then the last K-th
When the reception rearrangement up to the bits is completed, the k value becomes “K +
1 ”(step S178), so that step S1
At 73, it is confirmed that the k value has exceeded the maximum value K.

In this case, since the reception rearrangement processing using the reception rearrangement buffer 14 for the n-th station has been completed, the processing shifts to step S179 to transfer the data in the reception rearrangement buffer 14 to the nth station. The data is copied as is to the reception data area RD [n] of the n station. Then, FIG.
It returns to the communication order management processing of No. 2. In this manner, the data is copied to the reception data area RD [n] of the n-th station, so that the data can be transferred to the CPU unit 1.

As described above, according to the present embodiment, at the time of data transmission, the data to be transmitted is rearranged in the bit order handled by each station, and at the time of data reception, the data to be transmitted is rearranged. Since the data is rearranged from the bit order handled by each station to the bit order handled by the communication device 3, the bit order is rearranged based on the bit order handled in the communication device 3, whereby the bit order of each station is determined. Data communication adapted to the order can be realized.

The communication apparatus 3 rearranges the data to be transmitted so as to be in the bit order handled by each station, or arranges the data to be received from the bit order handled by each station to the bit order handled by the communication apparatus 3. Instead, the CPU unit 1 only transmits and receives data to and from the communication device 3, so that only the communication device 3 realizes data communication adapted to the bit order handled by each station, thereby achieving communication with each station. This eliminates the need for the CPU unit 1 to adapt to the bit order in which data is handled by each station. As a result, CP
The U unit 1 can create the sequence program 2 without being aware of the bit arrangement order of each station.

Since the transmission rearrangement table 13 and the reception rearrangement table 12 are initialized by the CPU unit 1, only when the transmission rearrangement rule and the reception rearrangement rule of each station need to be initialized. It is sufficient that the CPU unit 1 sends the data for initializing the transmission rearrangement table 13 and the reception rearrangement table 12 to the communication device 3, and simple initialization of the transmission and reception rearrangement rule can be realized.

According to the present invention, conversion of little-endian data and big-endian data can be performed on word data and double word data in order to manipulate the rearrangement of bits.

Further, the present invention has been described by way of an example in which the PC is applied to the communication device 3 and its communication system as in the above-described embodiment. However, the present invention is not limited to this. The present invention can be applied to a communication device such as a robot controller and the communication system thereof.

[0121]

As described above, according to the communication apparatus of the present invention, at the time of data communication, the data to be communicated is adapted to the bit-by-bit characteristics of each station. Data communication adapted to the bit arrangement characteristics can be realized.

According to the communication apparatus of the next invention, when transmitting data, the data to be transmitted is rearranged so as to have a bit order handled by each station, and when receiving data, the data to be received is rearranged. Since the bit order handled by each station is rearranged to the bit order handled by its own device, the bit order rearrangement is based on the bit order handled in its own device, and this adapts to the bit order of each station. Data communication can be realized.

According to the communication system of the next invention,
The communication device adapts the data to be communicated to the bit-by-bit characteristics of each station, and the control device only sends and receives data to and from the communication device. Realizing data communication adapted to
This eliminates the need for the control device to adapt the data to the bit-by-bit alignment characteristics of each station for communication with each station. As a result, a sequence program can be created on the control device side without being aware of the bit arrangement characteristics of each station.

According to the communication system of the next invention,
The communication device rearranges the data to be transmitted to the bit order handled by each station, or the data to be received is rearranged from the bit order handled by each station to the bit order handled by the communication device, and the control device communicates. Since data is only transmitted to and received from the device, data communication that is adapted to the bit order handled by each station is realized only on the communication device side, and by this, data is transmitted on the control device side for communication with each station. There is no need to adapt to the bit order handled by each station. As a result, a sequence program can be created on the control device side without being aware of the bit arrangement order of each station.

According to the communication system of the next invention,
Since the transmission rearrangement rule and the reception rearrangement rule are initialized by the control device, only when the transmission rearrangement rule and the reception rearrangement rule of each station need to be initialized, the control device initializes to the communication device. It is only necessary to send the transmission rearrangement rule and the reception rearrangement rule, and simple initialization of the transmission and reception rearrangement rule can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration of a communication device and peripheral devices according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a hardware configuration in a communication device in the system configuration of FIG. 1;

FIG. 3 is an explanatory diagram showing a memory structure of a two-port memory according to the present embodiment.

FIG. 4 is an explanatory diagram showing a bit rearrangement rule of a transmission rearrangement data setting area according to the present embodiment.

FIG. 5 is an explanatory diagram showing a bit rearrangement rule of a reception rearrangement data setting area according to the present embodiment.

FIG. 6 is an explanatory diagram showing a memory structure of a transmission rearrangement table according to the present embodiment.

FIG. 7 is an explanatory diagram showing a memory structure of a reception rearrangement table according to the present embodiment.

FIG. 8 is an explanatory diagram showing a bit rearrangement rule of a reception rearrangement table according to the present embodiment.

FIG. 9 is an explanatory diagram showing a memory structure of a transmission rearrangement buffer according to the present embodiment.

FIG. 10 is an explanatory diagram showing a memory structure of a reception rearrangement buffer according to the present embodiment.

FIG. 11 is an explanatory diagram showing a memory structure of a temporary buffer according to the present embodiment.

FIG. 12 is a flowchart showing a communication order management process according to the present embodiment.

FIG. 13 is an explanatory diagram showing a method of initializing a reception rearrangement table according to the present embodiment.

FIG. 14 is a flowchart illustrating initialization processing according to the present embodiment.

FIG. 15 is an explanatory diagram showing a rule of a transmission rearrangement process according to the present embodiment.

FIG. 16 is a flowchart illustrating transmission rearrangement processing according to the present embodiment.

FIG. 17 is an explanatory diagram showing a rule of a reception rearrangement process according to the present embodiment.

FIG. 18 is a flowchart illustrating a reception rearranging process according to the present embodiment.

FIG. 19 is a block diagram showing a network to which a conventional communication device is applied.

FIG. 20 is a block diagram illustrating a conventional data reception example from a digital input station to a communication device.

FIG. 21 is a block diagram showing a conventional example of data transmission from a communication device to a digital output station.

[Explanation of symbols]

1 CPU unit, 2 sequence program, 3
Communication device, 42-port memory, 5 firmware,
6 RAM, 7 communication order management unit, 8 transmission rearrangement unit, 9 reception rearrangement unit, 10 table initialization unit, 1
REFERENCE SIGNS LIST 1 transmission / reception unit, 12 reception rearrangement table, 13 transmission rearrangement table, 14 reception rearrangement buffer, 1
5 transmission rearrangement buffer, 16 temporary buffer, 18 communication medium, 20 communication order management program,
21 transmission rearrangement program, 22 reception rearrangement program, 23 transmission / reception program, 24 table initialization program, 40 CPU

Claims (5)

[Claims] 1. A communication device for controlling communication with a plurality of stations via a communication medium, wherein: a characteristic storage means for storing an arrangement characteristic in a bit unit corresponding to each of said stations; A conversion unit for converting data to be communicated in accordance with a bit-by-bit arrangement characteristic of each station stored in the characteristic storage unit. 2. A communication device for controlling communication with a plurality of stations via a communication medium, comprising: first storage means for storing a bit-by-bit transmission rearrangement rule corresponding to each station; A second storage unit for storing a reception rearrangement rule in bit units, and a data storage unit configured to store each of the stations stored in the first storage unit such that a bit order handled by each of the stations when transmitting data to each of the stations. Transmission rearranging means for rearranging data to be transmitted in accordance with another transmission rearrangement rule; and storing the data in the second storage means so as to be in a bit order handled by the own apparatus when receiving data from each station. And a reception rearranging means for rearranging the data to be received in accordance with the reception rearrangement rule for each station. 3. A communication system comprising: a communication device that controls communication with a plurality of stations via a communication medium; and a control device that controls a predetermined control target by communicating with the communication device. The apparatus includes: a characteristic storage unit that stores a bit-by-bit arrangement characteristic corresponding to each of the stations; and a data unit-by-station bit-unit arrangement characteristic stored in the characteristic storage unit during data communication with each of the stations. A conversion unit that converts data to be communicated according to the control device, wherein, when communicating with the communication device, the control device transmits the communication target data to be converted by the conversion unit. And a transmitting / receiving means for receiving data obtained by converting the data to be communicated by the converting means. 4. A communication system comprising: a communication device that controls communication with a plurality of stations via a communication medium; and a control device that controls a predetermined control target by communicating with the communication device. The apparatus comprises: a first storage unit that stores a transmission rearrangement rule in bit units corresponding to each of the stations; a second storage unit that stores a reception rearrangement rule in bit units corresponding to each of the stations; Transmission rearranging means for rearranging data to be transmitted in accordance with the transmission rearrangement rule for each station stored in the first storage means so that the bit order handled by each station at the time of data transmission is performed. When receiving data from the respective stations, the data to be received is arranged in accordance with the reception rearrangement rule for each of the stations stored in the second storage means so that the bit order handled by the own apparatus is used. The control unit transmits the data to be transmitted to be rearranged by the transmission rearrangement unit when communicating with the communication device, and performs the reception rearrangement. A communication system comprising transmitting / receiving means for receiving data obtained by rearranging the data to be received by the means. 5. The control device includes rule transmission means for transmitting a transmission rearrangement rule and a reception rearrangement rule for initialization to the communication device, and the communication device receives the rule from the rule transmission device. 5. The communication system according to claim 4, further comprising initialization means for initializing said first storage means and said second storage means based on said transmission rearrangement rules and reception rearrangement rules for initialization.