KR200251567Y1 - Apparatus for transferring data communication protocol above scada system - Google Patents

Abstract

The present invention relates to a data transmission protocol conversion apparatus applied to a supervisory control and data acquisition system (SCADA) for centrally monitoring and controlling devices and equipment installed at remote locations. The present invention receives and analyzes a request packet transmitted from a central control computer on the supervisory control and data acquisition system (SCADA) formed with a communication link in a predetermined data transmission protocol, and corresponds to the result of the analysis. A high-level protocol analyzer for searching and detecting data according to a search result, and configuring the detected data into packets corresponding to a data transmission protocol formed with the central control computer and transmitting the detected data to the central control computer; Sub-protocol interpreter for receiving packets and messages transmitted from remote devices on the SCADA formed by a communication link in a predetermined data transmission protocol, and converting and storing the received packets and messages as data forms. ; Data applied to a Supervisory Control and Data Acquisition System (SCADA) further comprising a buffer for retrieving and detecting through the upper protocol interpreter and transmitted from the remote devices and storing the converted data through the lower protocol interpreter. A transmission protocol conversion device is featured.

Description

Data transfer protocol conversion device for supervisory control and data acquisition system {APPARATUS FOR TRANSFERRING DATA COMMUNICATION PROTOCOL ABOVE SCADA SYSTEM}

The present invention relates to a data transmission protocol conversion apparatus applied to a supervisory control and data acquisition system (SCADA) for centrally monitoring and controlling devices and equipment installed at remote locations.

Conventional Supervisory Control And Data Acquisition (SCADA) systems are used to centrally monitor and control devices and equipment installed remotely.

The SCADA system allows the central operator to monitor and control the remote situation in real time. Accordingly, the SCADA system has an automatic control, monitoring, and information processing function and is widely used in a wide range of fields.

Examples of the use thereof include railroad management and control, water resource management, transmission and distribution services, gas and oil storage and supply services, civil defense, flood warning systems, and the like.

In addition, the use of the SCADA system can be more effective and the cost savings can be increased, the automation and remote control function through the SCADA system is maximized the investment efficiency for equipment and operation personnel.

The SCADA system includes a central control computer, or a SCADA server, which allows a central operator to monitor and control, and remote devices installed remotely to control the central control computer, and the central control computer and the remote devices. It is generally composed of a communication link on a wired / wireless line forming a data transmission path.

In the case of the remote equipment, data collection and remote control, remote diagnosis-arithmetic function-wireless, wireless data communication-operator terminal access-remote input and output of the application-input and output data statistics, etc. It is implemented to transmit the details to the central control computer.

The central control computer monitors and displays various information reported by the remote devices.

Meanwhile, in the SCADA system, data exchange is continuously performed between the central control computer and the remote devices. To accomplish this, the communication protocol and the data transmission protocol must be identical in the data exchange.

In other words, a communication link is established between the central control computer and the remote equipment, thereby making necessary data exchange.

Therefore, if you want to build a SCADA system, the central control computer and remote equipment must be implemented to use the same data transmission protocol.

On the other hand, in addition to improving the performance of the constructed SCADA system, there are cases in which hardware equipment changes on the system are made due to additional construction of various remote devices and additional implementation of functions.

In this case, the data transmission protocols that form the communication link between the equipment to be improved and added for normal operation of the SCADA system must be identical. In such a case, the SCADA system can continue normal operation.

However, there are cases where data transmission protocols are different from each other according to the manufacturer's difference in supplying each device. In this case, the SCADA system does not perform normal operation.

As a representative example, if the manufacturer supplying the central control computer and the manufacturer supplying the remote devices are different from each other, the data transmission protocols on the communication link formed between them may be different. In this case, the central control computer and the remote devices do not have mutually necessary data exchange.

In general, in order to solve such problems, equipments using the same data transmission protocol have to be used to construct a SCADA system.

However, when the SCADA system is built or improved with equipment using the same data transmission protocol, it is usually used unified with equipment manufactured by the same company. This is because many manufacturers use different data transmission protocols.

This resulted in the problem that even if the performance of certain equipment is better, it can not be used.

In particular, there may be a demand to build a SCADA system using central control computers and remote devices having different data transmission protocols according to improved effects, cost savings, and improved performance. In this case, data between the devices If the transport protocols were not the same, there was no way to satisfy that requirement.

Therefore, there has been a need for a separate data transfer protocol conversion device that allows data to be exchanged freely between a central control computer and remote equipment using different data transfer protocols.

However, at present, there has not been proposed a data transfer protocol conversion apparatus that satisfies this suitably.

Therefore, an object of the present invention, which can be used on the SCADA system, the supervisory control and data acquisition system (SCADA) to enable the interchange of data between the central control computer and remote devices using different data transmission protocols An apparatus for converting a data transmission protocol is provided.

In order to achieve this purpose the present invention,

A data transmission protocol conversion apparatus applied on a supervisory control and data acquisition system (SCADA);

Receives and analyzes a request packet transmitted from a central control computer on the SCADA, which is formed by a communication link using a predetermined data transmission protocol, and searches for pre-stored data corresponding to the analyzed result, and a search result. A high-level protocol analyzer configured to detect data according to the data, and convert the detected data into packets corresponding to a data transmission protocol formed with the central control computer and transmit the data to the central control computer;

Sub-protocol interpreter for receiving packets and messages transmitted from remote devices on the SCADA formed by a communication link in a predetermined data transmission protocol, and converting and storing the received packets and messages as data forms. Wow;

An apparatus for converting a data transmission protocol comprising a buffer for retrieving and detecting data through a driving of the upper protocol interpreter, transmitted from the remote devices, and stored in the lower protocol interpreter is stored.

1 is a view showing the overall configuration of the supervisory control and data acquisition system (SCADA) to which the data transmission protocol conversion apparatus according to an embodiment of the present invention is applied.

2 is a view showing the internal module configuration of the data transmission protocol conversion apparatus according to an embodiment of the present invention.

3 is a control flowchart illustrating a control flow of an upper protocol interpreter in a data transmission protocol conversion apparatus according to an embodiment of the present invention.

4 is a control flowchart illustrating a first control flow of a lower protocol analyzer in the apparatus for converting a data transmission protocol according to an embodiment of the present invention.

5 is a control flowchart illustrating a second control flow of a lower protocol analyzer in the apparatus for converting a data transmission protocol according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they are displayed on different drawings.

In addition, in the following description, numerous specific details, such as specific design structures, are shown to provide a more general understanding of the subject innovation. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

And a detailed description of known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a view showing the overall configuration of the SCADA system to which the data transmission protocol conversion apparatus according to an embodiment of the present invention is applied.

Referring to this, reference numerals 100-1 and 100-2, which may be represented by reference numeral 100, are central control computers used in SCADA systems, which are commonly referred to as scarda servers.

The SCADA server monitors and controls the situation of facilities installed at remote sites in real time, and is usually a workstation-class processor, a UNIX environment, or a PC (Human Machine Interface) based on a PC. It is built through a combination of software.

The SCADA server manages a shared database, collects historical data, manages a database, and manages an entire network and a system.

Reference numeral 200 is a proposed data transmission protocol conversion apparatus according to the implementation of the present invention, which is implemented by being installed as a remote communication unit that requires control, monitoring, and management.

The data transmission protocol conversion device forms a communication link with the skida server, and performs necessary data exchange with the skida server through the formed communication link.

The communication link is formed based on the TCP / IP protocol to satisfy IEC 60870-104 and IEC 60870-101, DNP 3.0, Harris protocol, on the application layer.

That is, the SCADA server and the data transmission protocol conversion device perform data exchange according to IEC 60870-104, IEC 60870-101, DNP 3.0, and Harris protocol.

In addition, the data transmission protocol conversion device forms a communication link with the equipment consisting of the lower stage, the equipment on the remote site described below.

Typically, the lower end equipment and the upper end equipment, that is, the SCADA server may have different data transmission protocols when they are composed of products of different manufacturers, or according to further implementation and improvement of performance.

In this case, the data transmission protocol conversion apparatus according to an embodiment of the present invention performs data conversion between the different data transmission protocols so that a communication link can be formed between the sky server and the lower level equipment.

As an example, the data transmission protocol with the SCADA server may be IEC 60870-104, IEC 60870-101, DNP 3.0, Harris protocol, etc. as described above, and the data transmission protocol with the lower devices is IEC 60870-103. , DNP 3.0, or the like.

In the case of DNP 3.0, the data transmission protocols of the upper and lower stages match, so that there is no problem in data transmission. However, in the case of the IEC 60870-104 or IEC 60870-101 and IEC 60870-103 protocols, Since codes, 104, 101, and 103 are used, no communication link is formed between them.

For reference, the IEC 60870 transmission protocol is applied in the SCADA system applied as a railway control system.

Therefore, the data transmission protocol conversion apparatus performs protocol conversion between the codes 104, 101, and 103.

Reference numeral 300 denotes a star coupler, which forms a communication link on a lower layer in the open mode bus method with the data transfer protocol converter. The upper layer thereof becomes the TCP / IP protocol, and the upper layer thereof, that is, the application layer, becomes the IEC 60870-103 and the DNP 3.0 protocol.

Through the star coupler, a communication path between a protocol conversion device, that is, a communication unit proposed by the present invention and a plurality of devices is formed.

Reference numeral 400 is a MU (Majority Unit) to form a serial communication link with the protocol conversion device. Typical serial methods are RS 232C or RS 485.

However, depending on the needs of the practitioner, it is also possible to form a communication link that satisfies the IEC 60870-101 and IEC 60870-104 protocols. In this case, the data transmission protocol conversion apparatus according to an embodiment of the present invention handles data transmission between the same protocols.

Reference numerals 500-1 and 500-N are remote equipments installed on remote sites, and perform monitoring and control of actual site conditions, monitoring of alarms and events, and displaying real-time trends.

In addition, other report inquiry and output, history event inquiry and output function is additionally performed.

The remote equipment collects field data and transmits it to a higher system, that is, a server.

Similarly, it receives control data from the server and sends it to the site.

The remote devices form a communication link with the star coupler, and the formed communication link is formed to satisfy the IEC 60870-103, DNP 3.0 protocol on the application layer based on the TCP / IP protocol on the open mode bus.

Meanwhile, the remote devices may form a communication link directly with the protocol conversion device at the request of the implementer, in addition to forming a communication link through the star coupler. In this case, a communication link is also established that satisfies the IEC 60870-103, DNP 3.0 protocol.

2 is a view showing the internal module configuration of the data transmission protocol conversion apparatus according to an embodiment of the present invention.

Referring to this, the inside of the apparatus for converting data transmission protocol is largely a transmission / reception for storing packets and messages which are interpreted and transmitted on the upper protocol interpreter 210, the lower protocol interpreter 240, and the upper protocol interpreter 210 and the lower protocol interpreter 240 as data forms. It consists of buffers 220 and 230.

First, the higher protocol interpreter 210 forms a communication link with the SCADA server 100. And process the packet reception from the SCADA server 100 through the formed communication link, and process the verification of the received packet.

In addition, the upper protocol interpreter 210 retrieves data after being transmitted from the remote devices 500 and then transmitted through the star coupler 300 or the MU 400 in a stored state. The required data is detected from the retrieved data, and the detected data is transmitted to the SCADA server 100 for processing.

Data transmission with the SCADA server 100 is performed in the form of a packet that satisfies the IEC 60870-104, IEC 60870-101, DNP 3.0, Harris protocol.

The lower protocol analyzer 240 forms a communication link with the star coupler 300 and the MU 400. Then, the formed link and the reception and interpretation processing of the packets and messages transmitted from the star coupler 300 and the MU 400 is performed. It also handles verification of the received packets and messages.

Then, a data detection operation is performed from the verified packet and message, and an operation of storing and detecting the detected data into the transmission and reception buffers 230 and 240 is performed.

The lower protocol interpreter 240 performs packet and message transmission with the star coupler 300 and the MU 400 by performing processing according to the IEC 60870-103 and DNP 3.0 protocols on an open mode bus.

The reception buffer 220 stores the packets and messages verified after being analyzed by the lower protocol interpreter 240, and the storing of the packets and messages is performed in the form of data extracted from the packets and messages.

The stored data is searched, detected, and packetized by the upper protocol interpreter 210 according to a request from the skid server 100 and transmitted to the skid server 100.

The transmission buffer 230 stores a packet requested from the server server 100 in data form, or stores a packet transmitted from the server server 100 to the remote devices 500 at all times in data form.

Data stored in the transmission buffer 230 is transmitted in the form of packets and messages to the star coupler 300 or the MU 400 through the operation of the lower protocol analyzer 240.

The transmitted data is transmitted after being converted into packets and messages according to the IEC 60870-103, DNP 3.0 protocol.

3 is a control flowchart illustrating a control flow of the upper protocol interpreter 210 in the apparatus for converting a data transmission protocol according to an exemplary embodiment of the present invention.

Referring to this, in step 30, the upper protocol interpreter 210 performs a standby state. In step 31, it is determined whether the connection is with the SCADA server 100. The connection is made through the protocol defined among the IEC 60870-104, IEC 60870-101 DNP 3.0, Harris protocol on the application layer that is the upper layer according to the TCP / IP protocol base.

In step 31, when in the connected state, in step 32, a request packet transmitted from the scarda server 100 is received. The request packet is a packet that the server server 100 wants to receive and report from remote devices.

In step 33, the received request packet is verified, and when verification is confirmed, in step 34, the data received from the star coupler 300 or the MU 400 is searched and stored on the reception buffer 220 according to the analysis result.

The search and the detection are the data corresponding to the request packet, which is the data that the scarda server 100 requests to receive.

In step 35, the detected data is transmitted to the scarda server 100. Transmission is composed of packets according to the IEC 60870-104, IEC 60870-101, DNP 3.0, Harris protocol on the application layer in accordance with the TCP / IP protocol base.

In step 36, it is determined whether the connection with the SCADA server is terminated, and if it is determined that the connection is terminated, the transmission process is terminated.

4 is a control flowchart illustrating a first control flow of a lower protocol analyzer in the apparatus for converting a data transmission protocol according to an exemplary embodiment of the present invention. Control flow chart showing the control flow of the.

Referring to this, in step 40, the lower protocol analyzer 240 performs connection with the star coupler 300. In the SCADA system, the data of the remote devices are continuously transmitted, and the lower protocol interpreter 240 is connected to the star coupler 300 so that the transmitted data is transmitted.

In step 41, it is determined whether the connection is successful, and in such a case, the request packet is transmitted to the star coupler 300 in step 42. The request packet is a request packet transmitted from the server, or a request packet according to a predetermined command.

In step 43, the packet received in response to the request packet from the star coupler 300, that is, the response packet is received.

The request packet transmission and response packet reception are performed according to the IEC 60870-103 and DNP 3.0 protocols processed on the upper application layer according to the TCP / IP protocol based on the open mode bus.

However, it may be based on serial communication depending on the application of the implementer.

In step 44, the received response packet is verified and then the result is checked. If the verification of the packet is confirmed, in step 45, data is extracted from the received response packet.

In step 46, the extracted data is stored in the transmission buffer, and in step 47, it is determined whether there is a connection termination request.

If there is a connection termination request, the connection with the star coupler 300 is terminated in step 48.

5 is a control flowchart illustrating a second control flow of a lower protocol analyzer in the apparatus for converting a data transmission protocol according to an embodiment of the present invention. Control flow chart showing control flow.

Referring to this, in step 50, the serial port is initialized. In step 51, the data request message is transmitted. In step 52, a response message received in response to the transmitted request message is received.

In step 53, the received message is verified and verified, and if confirmed, in step 54, data is extracted from the message. The extracted data is stored in the transmission buffer 230 in step 55.

In step 56, it is determined whether to terminate, and according to the result, the operation or the termination process of step 51 is performed.

On the other hand, in the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments described, but should be defined by the scope of the utility model registration claims to be described later and the equivalents of the utility model registration claims.

As described above, the present invention has an advantage in the SCADA system that data can be exchanged between a central control computer and remote devices using different data transmission protocols.

In addition, by installing the data transmission protocol conversion apparatus according to the implementation of the present invention on the SCADA system, it is easy to expand and improve the system later in the construction of the SCADA system, and the side effect of reducing the construction cost Is achieved.

Claims (4)

In the data transmission protocol conversion apparatus applied to the supervisory control and data acquisition system (SCADA), Receives and analyzes a request packet transmitted from a central control computer on the SCADA, which is formed by a communication link using a predetermined data transmission protocol, and searches for pre-stored data corresponding to the analyzed result, and a search result. A high-level protocol analyzer configured to detect data according to the data, and configure the detected data into packets corresponding to a data transmission protocol formed with the central control computer, and transmit the data to the central control computer. Sub-protocol interpreter for receiving packets and messages transmitted from remote devices on the SCADA formed by a communication link in a predetermined data transmission protocol, and converting and storing the received packets and messages as data forms. Wow, And a buffer for storing the data retrieved and detected through the operation of the upper protocol interpreter, transmitted from the remote devices, and converted through the lower protocol interpreter. The method of claim 1, wherein the buffer, A receiving buffer for storing data extracted from the packet and the message which have been analyzed after being analyzed by the lower protocol interpreter; And a transmission buffer which is interpreted and verified by the upper protocol interpreter and is converted into a packet and a message form by driving the lower protocol interpreter and stored in the form of data in a request packet transmitted to the remote devices. Transmission protocol conversion device. The method of claim 1, wherein the higher protocol analyzer, And a communication link formed by the central control computer through a data transmission protocol defined among IEC 60870-104, IEC 60870-101, DNP 3.0, and Harris protocol. The method of claim 1, wherein the lower protocol interpreter, And a communication link is formed through the data transmission protocol of the IEC 60870-103 and the DNP 3.0 protocols on the central control computer and the open mode bus.