JPH053485A - Data transmitter - Google Patents

Abstract

(57) [Summary] [Purpose] The configuration of the controller connected to the remote station has been simplified. [Structure] The master station 1 and remote stations 3 and 4 are connected in a loop by a transmission line 5. The relay device 2 includes a connection circuit, and when the program is input from the program loader connected to the connection circuit, the relay device 2 outputs the program to the designated remote station 3. The remote station 3 to which the program is given from the relay device 2 outputs the program to the multifunction protection relay 9 connected thereto. The multifunction protection relay 9 operates according to a given program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for performing data transmission between a master station and a remote station or between remote stations based on address information from the master station.

[0002]

2. Description of the Related Art As a data transmission system of this type,
The master station has a memory for data transmission, and one remote station serving as a talker is set for each transmission address set in the memory for transmission, and the station serving as a listener is the master station or the remote station. Is set to. When data is transmitted from a predetermined remote station to the master station, the master station outputs address information including the talker address set in the remote station to the transmission path. Then, each remote station determines whether the transmission address indicating the address information is the talker address set in itself. Then, the remote station, which has determined that the address information is its talker address, transmits the data from the controller connected to itself to the transmission line, so that the master station receives the data output to the transmission line.

On the other hand, the programmable controller is provided so that data can be written in and read from the transmission memory of the master station, and when data from the remote station set in the talker is written in the transmission memory, The data is read, the read data is processed, and the data based on the result is written to a predetermined talker address in the transmission memory. Then, the master station sends the data in the memory for transmission following the address information to the transmission line, and each remote station, if the received address information matches the listener address set in itself, then Read the data following and send it to the connected controller. As a result, the controller connected to the remote station operates based on the input data.

Here, in order to operate the controller connected to the remote station by a predetermined program as described above, a connection circuit for connecting to the program loader is provided in the controller, and the program loader is connected to the connection circuit. By doing so, the program is input from the program loader to the controller via the connection circuit. Therefore, by inputting the program from the program loader, the controller operates based on the program.

On the other hand, the transmission line connecting each station tends to have a long distance. In such a case, the S / N ratio of the signal indicating the address information is deteriorated, so that a relay device is provided on the transmission line. The relay device relays the address information output to the transmission path to improve the noise characteristic.

[0006]

However, in the case of the above-mentioned conventional configuration, it is necessary to provide each controller with a connection circuit for connection with the program loader in addition to the configuration for connection with the remote station. It is complicated. Furthermore, in this case, in addition to the program for transmitting with the remote station, the program for inputting the program from the program loader through the connection circuit needs to be stored in the controller in advance, which makes the program complicated. It has the drawback of becoming

On the other hand, the relay device provided on the transmission line has only the function of relaying address information, and it has been desired to increase its added value, but at present it has not been realized yet. is there.

The present invention has been made in view of the above circumstances, and an object of the present invention is to perform transmission between a master station and a remote station via a relay device provided on a transmission line, which is connected to the remote station. It is an object of the present invention to provide a data transmission device that can simplify the configuration of the controller and increase the added value of the relay device when the controller is operated by the program from the program loader.

[0009]

According to the present invention, a master station having a transmission memory in which a transmission address composed of a talker address and a listener address is set, and a talker or a listener corresponding to the transmission address. Input from the remote station set in the talker via the transmission memory and a controller that operates according to the program set by the program loader and is connected to the remote stations. A programmable controller that outputs data to a remote station that is set as a listener through the transmission memory, and a transmission path that connects the master station and the remote station in a loop, and Ma By outputting address information including the transmission address from the target station to the remote station through the transmission path, the remote station that is set to be a talker corresponding to the transmission address is owned by the remote station. In a data transmission system in which the remote station or the master station, which is set to be a listener corresponding to the transmission address, receives the data from the transmission line, in the middle of the transmission line. A relay device that relays the address information output from the master station and outputs the address information to the transmission path is provided, and the relay device includes a connection circuit that connects to the program loader, and the connection circuit is connected from the program loader. Entered via With gram via the remote station transmits to the controller, in which the data output through the remote station from said controller and configured to transmit the program loader through the connection circuit.

[0010]

When address information is output from the master station to the transmission line, the address information is relayed by the relay device and output to the remote station. Then, the data output from the remote station is relayed by the relay device and output to the master station.

When a program created by the program loader is input to the controller connected to the remote station, the program loader is sent to the relay device while the program loader is connected to the connection circuit provided in the relay device. .. Then, the relay device transmits the program to the remote station designated by the program loader via the transmission line.
The designated remote station sends the inputted program to the controller to which it is connected, so that the controller operates according to the program received from the remote station.

Further, when it is desired to call the required data from the controller, the request code of the required data is sent from the program loader to the controller according to the above method, so that the controller can send the program loader to the program loader via the remote station and the relay device. Since the controller can be freely programmed and necessary data can be read out, it is not necessary to provide a program loader connection circuit for all the controllers.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the overall configuration of the control center control system. Here, the control center is, for example, a large number of control units arranged to control the low-voltage motor.

In FIG. 1, the master station 1 is connected to a plurality of repeaters 2, a control center remote station 3 and a site operation remote station 4 via a transmission line 5 formed in a loop. , And is connected to a programmable controller 7 for controlling the entire system via a system bus 6. The master station 1 receives the status signal sent from the relay device 2 and the remote stations 3 and 4, and sends the received status signal to the programmable controller 7.

In each unit of the control center 8,
A remote station for control center 3, a multifunctional protection relay 9 as a controller, and an electromagnetic contactor 10 are housed in each unit. The control center remote station 3 receives the operation data sent from the master station 1 and the field operation remote station 4 via the transmission path 5 and the relay device 2, and at the same time receives the operation data. Send to.
The multi-functional protection relay 9 opens and closes the electromagnetic contactor 10 in accordance with given operation data to induce the induction motor 11
The main circuit 12 is cut off to control the start / stop of the induction motor 11. The multifunction protection relay 9 also sends the status data of the induction motor 11, the main circuit current value, and the failure status data to the control center remote station 3. And the remote station for control center 3
Transmits various data given from the multifunctional protection relay 9 to the remote station 4 for site operation via the relay device 2 and the transmission path 5.

On the other hand, the remote station 4 for field operation
Is arranged in the vicinity of the induction motor 11 and transmits and receives operation data for starting and stopping the induction motor 11 to and from the master station 1 and the control center remote station 3, and displays the status signal of the induction motor 11. Turn on the lamp.

The programmable controller 7
Exchanges data with predetermined remote stations 2 and 3 via the master station 1 to control, monitor and protect the induction motor 11 and control the entire system.

Next, the structure of the relay device 2 will be described with reference to FIG. The relay device 2 includes a CPU 13 including a one-chip microcomputer and two serial data transmission units 1
4, 15 and a memory 16 are provided. Further, as the serial data transmission units 14 and 15, UART (asynchronous serial transfer) is used.
A pulse transformer with a function is used.
It is connected to the transmission line 5 via 7 and 18, respectively.
Then, the relay device 2 receives the signal received from the one transmission path 5 by the pulse transformer 17 and the serial data transmission units 14, 1.
5. Converted to a prescribed voltage level and pulse width and transmitted to the other transmission line 5 via the pulse transformer 18. In this case, the relay device 2 has bidirectionality, and the data received from the other transmission line 5 is transmitted to one transmission line 5 via the pulse transformer 18, the serial data transmission units 15 and 14, and the pulse transformer 17. Send out. Further, the CPU 13 uses the transmission line 5
The address information received from the serial data transmission unit 14, 1
5, the signal is sent to the other transmission line 5 via the pulse transformer 17. A connection circuit 19 is provided in the relay device 2, and the program loader 20 is connected to the connection circuit 19. The program loader 20 is for setting a program in the multi-function protection relay 9. In this case, the CPU 13 causes the connection circuit 19
When the program loader is connected to, the program from the program loader 20 is stored in the memory 16 via the connection circuit 19, and the data stored in the memory 16 is sent to the program loader 20 via the connection circuit 19. It has become.

Next, the structure of the master station 1 will be described with reference to FIG. The master station 1 includes a CPU 21, a serial data transmission unit 22 and a C, which is a one-chip microcomputer for controlling the entire operation.
The memory 23 is provided for storing the operation program of the PU 21, fixed data, and the like. The serial data transmission unit 22 has a UART function, and the pulse transformer 2
It is connected to the transmission path 5 via 4. The serial data transmission unit 22 receives serial data from the transmission line 5 via the pulse transformer 24 and outputs the serial data to the transmission line 5. One input port of the dual port memory 25, which is a transmission memory, is connected to the CPU 21, and the other input port is connected to the programmable controller 7 via the system bus 6. A talker area and a listener area are set in the dual port memory 25. Here, the talker area is the master station 1
Is a storage area to which a talker address is attached. For example, a 2-byte storage area is secured for each address, and transmission is performed to remote stations 3 and 4 that are set to be listeners corresponding to that address. The data to be done is retained. On the other hand, the listener area is a storage area to which an address for the master station 1 to be a listener is added, and a storage area of, for example, 2 bytes is secured for each address, and is set as a talker for that address. The data transmitted from the remote stations 3 and 4 and the relay device 2 are held. Then, the programmable controller 7 is adapted to access the dual port memory 23 via the system bus 6.

Next, the structures of the control center remote station 3 and the multifunctional protection relay 9 will be described with reference to FIG. The control center remote station 3 is provided with a CPU 26, which is a one-chip microcomputer for controlling the overall operation, a DC data transmission unit 27, and a memory 28 for storing operation programs and fixed data of the CPU 26. The DC data transmission unit 27 has a UART function and is connected to the transmission line 5 via a pulse transformer 29. The DC data transmission unit 27 receives the DC data transmission from the transmission line 5 via the pulse transformer 29 and outputs the DC data to the transmission line 5.

The multi-function protection relay 9 is composed of a CPU 30 and a memory 31 which are one-chip microcomputers.
And an input / output circuit 32 connected to an external circuit to control the electromagnetic contactor 10 and the like. The CPU 30 is connected to the CPU 26 of the remote station 3 via the data bus 33, and thereby, necessary data can be transmitted and received between the multifunctional protection relay 9 and the remote station 3.

Next, the operation of the above configuration will be described. With the transmission data written in the transmission memory 23 of the master station 1 from the programmable controller 7, the master station 1 outputs the address information including the transmission data written in the transmission memory 23 to the transmission line 5. .. Then, the relay device 2 connected to the transmission line 5
Since the signal waveform of the address information input from the transmission line 5 is shaped into a prescribed voltage and pulse width and then output to the transmission line 5, each remote station 3 or 4 connected to the transmission line 5 is connected to the transmission line 5 from the transmission line 5. Enter the address information. Then, the remote stations 3 and 4, which have determined that the talker is set based on the input address information, output the data owned by themselves to the transmission path 5. At this time, the remote stations 3 and 4 or the master station 1 that have determined that they have been set as listeners based on the input address information receive data from the transmission path 5 via the relay device 2.

Here, the multi-function protection relay 9 automatically controls the induction motor 11 by opening and closing the electromagnetic contactor 10, the interlock condition with another electromagnetic contactor 10, or the induction motor 11 for a fixed time. When it is necessary to input a control program for operation or the like, the program loader 20 is connected to the connection circuit 19 of the relay device 2 closest to the control center 8, and the control program created by the program loader 20 is output to the relay device 2. To do. Then, the CPU 13 of the relay device 2 writes the program input through the connection circuit 19 into the memory 16 and sends the program to the control center remote station 3 designated by the program loader 20 through the transmission path 5. As a result, the remote station 3 inputs the program output from the relay device 2 to the transmission path 5 and sends the program to the multifunction protection relay 9. As a result, the multifunctional protection relay 9 reads the program from the program loader 20 and controls the electromagnetic contactor 10 according to the program.

When data indicating the state of the electromagnetic contactor 10 is output from the multi-function protection relay 9, the remote station 3 outputs the data to the transmission line 5.
Then, the relay device 2 inputs the data from the transmission path 5 and stores the data in the memory 16, and outputs the data stored in the memory 16 to the program loader 20 while the program loader 20 is connected to the connection circuit 19. As a result,
The program loader 20 can read the data from the multifunction protection relay 9.

In short, in the above embodiment, the relay device 2 for relaying the address information output from the master station 1 is provided with the connection circuit 19 for connecting with the program loader 20, and the program loader. When a program is given to the relay device 2 from the connection device 20 via the connection circuit 19, the program is output to the designated remote station 3. Therefore, the controller is provided with a connection circuit for connection with the program loader. Compared with the conventional configuration, it is possible to reduce the connection circuit for inputting the program, which simplifies the configuration of the controller and simplifies the program for controlling the operation of the controller. it can.

Further, in the case of the above embodiment, since an additional function can be added to the relay device 2 for relaying the address information from the master station 1, as compared with the conventional configuration having only the function of relaying the address information. Thus, the added value of the relay device 2 can be increased.

[0027]

As is apparent from the above description, according to the data transmission apparatus of the present invention, the address information output from the master station is relayed in the middle of the transmission line connecting the master station and the remote station. A relay device for outputting to the transmission path is provided, and the relay device includes a connection circuit for connecting to a program loader for programming a controller connected to the remote station, and from the program loader via the connection circuit. Since the input program is transmitted to the controller via the remote station, and the data output from the controller via the remote station is transmitted to the program loader via the connection circuit, the master station as well as In the transmission between remote stations to perform via a relay apparatus provided in the transmission path, when operating by the program from the program loader a controller coupled to a remote station,
This has the excellent effect that the configuration of the controller can be simplified and the added value of the relay device can be increased.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an overall configuration showing an embodiment of the present invention.

FIG. 2 is a block diagram of a relay device.

[Figure 3] Block diagram of the master station

FIG. 4 is a block diagram of a remote station and protection relay.

[Explanation of symbols]

1 is a master station, 2 is a relay device, 3 is a remote station for a control center, 4 is a remote station for field operation, 7 is a programmable controller, 9 is a multi-functional protective relay (controller), 19 is a connection circuit, and 20 is a program. It is a loader.

Claims (1)

Claim: What is claimed is: 1. A master station having a transmission memory in which a transmission address consisting of a talker address and a listener address is set, and a talker or a listener corresponding to the transmission address. A plurality of remote stations to be set, a controller that is connected to the remote stations and operates according to a program set by a program loader, and data is input from the remote stations set to the talker via the transmission memory. The master station includes a programmable controller that processes and outputs data to a remote station set as a listener through the transmission memory, and a transmission path that connects the master station and the remote station in a loop. Data which is set to be a talker corresponding to the transmission address by outputting address information including the transmission address from the network to the remote station through the transmission path. In the data transmission system in which the remote station or the master station, which is set to become a listener corresponding to the transmission address, receives the data from the transmission line, is provided in the middle of the transmission line. A relay device that relays the address information output from the master station and outputs the address information to the transmission path.
A connection circuit for connecting to the program loader, and a program input from the program loader via the connection circuit is transmitted to the controller via the remote station and is output from the controller via the remote station. A data transmission device configured to send data to a program loader via the connection circuit.