CN103728957B - HART (highway addressable remote transducer) field equipment management method and system based on real-time database - Google Patents

Abstract

The industrial operation station sends the valid data corresponding to the HART command to the control station in the form of a message in the industrial Ethernet protocol; the control station sends the unpacked valid data in the form of a message in the CAN protocol; the HART module unpacks The received CAN protocol message will send valid data in the form of HART command; after receiving the HART command, the HART device will return the response information to the HART module, unpack it, and send it to the control station in the form of a message in the CAN protocol; The control station unpacks the received CAN protocol message, packs and sends it to the industrial operation station in the form of a message in the industrial Ethernet protocol. The invention can send all HART field device data to the operation station of the main control room, allowing users to remotely view, modify, and configure field device configuration information in the control room, improving equipment maintenance efficiency and reducing production costs.

Description

A kind of HART field device management method and system based on real-time database

technical field

The invention relates to the technical field of HART communication, in particular to a real-time database-based HART field device management method and system.

Background technique

CAN (Controller Area Network), which belongs to the category of field bus, is a serial communication network that effectively supports distributed control systems. It was developed by Bosch in Germany in the 1980s for the automotive industry. communication bus. Because of its high performance, high reliability and unique design, people pay more and more attention to it, and it is widely used in many fields. And any errors that occur can be detected. When the signal transmission distance reaches 10km, CAN can still provide a data transmission rate up to 50kbit/s. Because the CAN bus has high real-time performance and application range, it can be arbitrarily matched from a high-speed network with a bit rate up to 1Mbps to a low-cost multi-line 50Kbps network. Therefore, CAN has been widely used in the fields of automobile industry, aviation industry, industrial control, safety protection and so on.

Highway Addressable Remote Transducer (HART for short) is a fieldbus communication protocol used between field smart instruments and control room equipment. The HART protocol is a protocol for transitioning from 4 to 20mA standard analog signals to digital signals. It superimposes a digital signal on the traditional 4-20mA standard analog signal, so that the original analog signal can still be used, and other information can be transmitted through the digital signal. This agreement enables the existing analog instruments to be gradually digitized without improvement, thereby greatly reducing costs and improving competitiveness. At present, HART protocol products have been widely used in the field of automation control. Therefore, in a certain period of time, the HART protocol still has strong vitality.

At present, HART field device management is to send and receive HART commands through RS-232 through the PC control station installed in the field, and communicate with HART field devices. HART field device management operation must have a PC control station with a serial port, which is connected to the HART field device through the serial port line, HART Modem, and matching resistors, so that the control station can manage the HART field device. Therefore, the current HART field devices must be connected to the on-site PC control station, and operators can only manage and maintain the HART field devices on site. At the same time, in most of the on-site PC control stations, the 4-20mA analog signal is only connected to the conventional I/O module through a separate cable, and any communication with the HART field device is temporarily connected through the handheld terminal to complete. The staff in the main control room cannot understand the actual situation of the HART field equipment, and cannot perform operations such as equipment management and parameter configuration on it. The traditional on-site inspection method is time-consuming and labor-intensive, and the operating status of the HART field equipment cannot be well known, which increases the probability of production failure.

Contents of the invention

The HART field device management method based on the real-time database of the present invention uses the real-time database to store effective data to connect the conversion between different protocols, and enhances the HART capability by converting the three different protocols, and can convert the digital signal of the HART field device It is integrated with its conventional process signals in the system platform, and sends all HART field device data to the operation station in the main control room, so that users can easily view, modify, and configure the configuration information of field devices remotely in the control room. All operations will be recorded in the database to be well documented. In this way, the maintenance rate is improved and the production cost is reduced. The specific technical scheme is as follows:

A kind of HART field device management method based on real-time database, comprises the steps:

The object of the present invention is to provide a kind of HART field equipment management method based on real-time database, comprise the steps:

S1: The industrial operation station sends the valid data corresponding to the HART command to the control station in the form of a message in the industrial Ethernet protocol;

S2: The control station unpacks the received industrial Ethernet protocol message, stores the valid data in the control station database, and sends it to the HART module in the form of a message in the CAN protocol;

S3: The HART module unpacks the received CAN protocol message, stores the valid data in the HART module database, and then forms a HART command form and sends it to the corresponding HART device;

S4: The HART device returns the response information to the HART module after receiving the HART command, and the HART module unpacks the response information to obtain valid response data, and packages the valid response data in the form of messages in the CAN protocol and sends them to the control station ;

S5: The control station unpacks the received CAN protocol message sent by the HART module, stores the effective response data in the control station database, and then packs and sends it to the industrial operation station in the form of a message in the industrial Ethernet protocol.

Further, the control station database is provided with two buffers for temporarily storing the industrial Ethernet protocol message and the CAN protocol message respectively.

Further, the frame format of the industrial Ethernet protocol message includes: destination address, source address, type, data, and CRC, wherein the data adopts UDP data message format and includes: IP header, UDP header, and application data.

Further, the format of the application data adopts a self-defined data frame format, including: verification information 1, user data and verification information 2.

Further, the HART module database is provided with two buffers for temporarily storing CAN protocol messages and HART commands respectively.

Another object of the present invention is to provide a kind of HART field device management system based on real-time database, including industrial operation station, control station, HART module and HART equipment;

The industrial operation station sends the valid data corresponding to the HART command to the control station in the form of a message in the industrial Ethernet protocol;

The control station unpacks the received industrial Ethernet protocol message, and stores the valid data in the control station database and sends it to the HART module in the form of a message in the CAN protocol;

The HART module unpacks the received CAN protocol message, and stores the effective data in the HART module database to form a HART command form and send it to the corresponding HART device;

The HART device returns the response information to the HART module after receiving the HART command, and the HART module unpacks the response information to obtain effective response data, and sends the effective response data to the control station in the form of messages in the CAN protocol ;

The control station unpacks the received CAN protocol message sent by the HART module, stores the effective response data in the control station database, and then packs and sends it to the industrial operation station in the form of a message in the industrial Ethernet protocol.

Further, the control station is provided with a database module, and the database module is provided with two buffers for temporarily storing the industrial Ethernet protocol message and the CAN protocol message respectively.

Further, the HART module is provided with a database module, and the database module is provided with two buffers for temporarily storing CAN protocol messages and HART commands respectively.

The beneficial effects of the present invention are as follows:

In the prior art, the HART module uses the hart master protocol and the CAN slave protocol, so it is impossible to directly convert data between different protocols. In the technical solution of the invention, the two communication protocols are isolated through the database, and the two use different buffers for temporary storage, which effectively solves the problem of the speed mismatch between the two protocols. A protocol communication problem affects another protocol. Furthermore, by using different buffers, the speed mismatch problem is effectively solved. At the same time, it is stipulated that the database is operated uniformly in one place, so that only one object can process the database at the same time, thereby avoiding operation conflicts caused by multiple objects processing data at the same time, and improving the efficiency of program operation.

Description of drawings

Fig. 1 is a flow chart of the method of the embodiment of the present invention.

FIG. 2 is a conversion diagram of the Ethernet protocol, the CAN protocol, and the HART protocol according to the embodiment of the present invention.

FIG. 3 is a conversion diagram of Ethernet protocol, CAN protocol, and HART protocol frame data flow according to the embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a HART field device management system based on a real-time database according to an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1 embodiment, a kind of HART field equipment management method based on real-time database comprises the following steps:

S1: The industrial operation station 1 sends the valid data corresponding to the HART command to the control station 2 in the form of a message in the industrial Ethernet protocol.

S2: After the control station 2 receives the industrial Ethernet protocol message sent by the industrial operation station 1, it unpacks it, puts the valid data in the corresponding position of the database of the corresponding control station, and the control station 2 takes out the corresponding valid data with the CAN protocol In the form of the message, it is packaged and sent to HART module 3.

Among them, the conversion process between the Industrial Ethernet (SNET) protocol and the CAN protocol is as follows:

As shown in Figure 3, the frame format of the Ethernet protocol message includes five parts: destination address, source address, type, data, and CRC. The data is in the form of UDP data message: IP header, UDP header, and application data. We have improved the application data format, customized the data frame format, and added check information 1 and check information 2 before and after the user data, which reduces the bit error rate, thus forming the principle of the SNET protocol.

The CAN protocol extended frame format includes five parts: command word, destination address, source address, data pointer, and user data.

In the control station, we have established an operation station database, and the operation station database is provided with two buffers for temporarily storing the industrial Ethernet protocol message and the CAN protocol message respectively. The industrial Ethernet (SNET) protocol is isolated from the CAN protocol, and the two use different buffers for temporary storage, which effectively solves the problem of the speed mismatch between the two protocols; because they are isolated from each other and do not affect each other, it also avoids a protocol communication failure. When a problem occurs, it causes a problem with another protocol. Using different buffers effectively solves the problem of speed mismatch. At the same time, it is stipulated that the database is operated uniformly in one place, so that only one object can process the database at the same time, thereby avoiding operation conflicts caused by multiple objects processing data at the same time, and improving the efficiency of program operation. After the industrial Ethernet protocol message is unpacked, the user data is placed in the corresponding position of the database of the corresponding operation station. According to the specification of the CAN master station protocol S3, the corresponding user data in the database 1 is packaged in the form of a message in the CAN protocol. .

S3: HART module 3 receives the CAN protocol message sent by the control station, unpacks it, puts the valid data in the corresponding position of the HART module database, HART module 3 takes out the corresponding valid data from the corresponding database, and According to the frame format requirements in the HART protocol, a complete HART command is formed and sent to the corresponding HART device 4 .

The conversion process between the CAN protocol and the HART protocol is as follows:

The HART protocol frame format includes seven parts of information: preamble, delimiter, address, HART command number, byte count, valid data, and checksum. Among them, the three parts of HART command number, byte count and valid data belong to HART application layer data; the three parts of delimiter, address and checksum belong to HART data link layer data; the preamble information belongs to HART physical layer data.

What is used in the HART module is the master station agreement of HART and the slave station agreement of CAN. Since the HART protocol is a low-speed communication protocol, and the CAN protocol is a high-speed communication protocol, it is impossible to directly convert data between different protocols. Therefore, we have established an ART module database to isolate the CAN protocol from the HART communication protocol. At the same time, the two use different buffers for temporary storage, effectively solving the problem of the speed mismatch between the two protocols; It avoids the problem of another protocol when there is a problem with the communication of one protocol.

Using different buffers effectively solves the problem of speed mismatch. At the same time, it is stipulated that the database is operated uniformly in one place, so that only one object can process the database at the same time, thereby avoiding operation conflicts caused by multiple objects processing data at the same time, and improving the efficiency of program operation. Using the HART command buffer effectively improves the efficiency of HART command execution. It solves the problem that many HART field device management software force users to fail to operate during the communication process. During HART communication, the normal HART data sampling will not be affected.

After the CAN protocol message is unpacked, the user data is placed in the corresponding position of the corresponding HART module database. According to the frame format requirements of the HART protocol, the corresponding user data in the HART module database is encapsulated in the HART frame format to form a complete The HART command information completes the conversion between the CAN protocol and the HART protocol.

S4: HART device 4 returns the response information to HART module 3 after receiving the HART command, and HART module 3 unpacks the response information to obtain valid response data, and packages and sends the valid response data in the form of messages in the CAN protocol Give control station 2.

S5: After the control station 2 receives the CAN protocol message sent by the HART module 3, it unpacks it, puts the valid data in the corresponding position of the control station database, and the control station takes out the corresponding valid data as the industrial Ethernet protocol. In the form of a message, it is packaged and sent to the industrial operation station 1.

In the embodiment shown in Fig. 2, we model the HART field devices, abstract the HART field devices into a data model, and facilitate unified management. This process does not depend on the HART protocol.

In the operation station, the industrial operation station interface obeys the Ethernet receiving protocol X1, and sends the valid data corresponding to the HART command to the control station in the form of a message in the industrial Ethernet protocol. At the same time, the response information fed back by the control station is received, and this information is returned in the form of a message in the Ethernet protocol. This message is not a complete HART command message, but a standard Ethernet protocol data frame, which transmits valid data of the HART field device model. Compared with HART protocol commands, the amount of data is much less, and has nothing to do with HART field devices.

In the control station, according to the Ethernet publishing protocol X2, the control station unpacks the industrial Ethernet protocol message sent by the operation station after receiving it, and puts the valid data in the corresponding position of the corresponding real-time database. At the same time, according to the specification of the CAN master station protocol X3, the control station takes out the corresponding valid data and sends them to the HART module in the form of messages in the CAN protocol. At the same time, according to the CAN master station protocol X3, after receiving the CAN protocol message sent by the HART module, the control station unpacks it and puts the valid data in the corresponding position of the corresponding real-time database. According to the specific specification requirements of the Ethernet release protocol X2, the control station takes out the corresponding valid data in the form of messages in the industrial Ethernet protocol, packages and sends them to the HART field device management software based on the real-time database in the operation station.

In the HART module, according to the CAN slave station protocol X4 specification content, the HART module receives the CAN protocol message sent by the control station, unpacks it, and puts the valid data in the corresponding position of the corresponding database. According to the content of the HART master station protocol X5, the HART module takes out the corresponding valid data from the corresponding database, and forms a complete HART command according to the frame format requirements in the HART protocol and sends it to the corresponding HART field device. The CAN protocol message is a self-defined CAN data frame, which is used for effective data transmission of the high-speed HART field device model. And has nothing to do with HART field devices. At the same time, the HART module receives the response information from the HART device according to the X5 specification of the HART master station protocol. The HART module unpacks the response information, stores the valid data in the form of messages in the CAN protocol, and sends them to the control station in packages.

In the HART device, according to the content of the HART slave station protocol X6, the HART device receives the HART command from the HART module, and returns the corresponding slave station response information to the HART module after successful reception.

Corresponding to a kind of HART field device management method based on real-time database of the present invention, also provide a kind of HART field device management system based on real-time database, Fig. 4 is the structural representation of the software update system of a kind of mobile terminal of the present invention, as shown As shown in 4, the system includes an industrial operation station, a control station, a HART module and a HART device;

The industrial operation station sends the valid data corresponding to the HART command to the control station in the form of a message in the industrial Ethernet protocol;

The control station unpacks the received industrial Ethernet protocol message, and stores the valid data in the control station database and sends it to the HART module in the form of a message in the CAN protocol;

The HART module unpacks the received CAN protocol message, and stores the effective data in the HART module database to form a HART command form and send it to the corresponding HART device;

The HART device returns the response information to the HART module after receiving the HART command, and the HART module unpacks the response information to obtain effective response data, and sends the effective response data to the control station in the form of messages in the CAN protocol ;

The control station unpacks the received CAN protocol message sent by the HART module, stores the effective response data in the control station database, and then packs and sends it to the industrial operation station in the form of a message in the industrial Ethernet protocol.

Wherein, the control station is provided with a database module, and the database module is provided with two buffers for temporarily storing the industrial Ethernet protocol message and the CAN protocol message respectively. The HART module is provided with a database module, and the database module is provided with two buffers for temporarily storing CAN protocol messages and HART commands respectively.

Claims (8)

1. a kind of hart site equipment management method based on real-time data base is it is characterised in that comprise the steps:

Corresponding for hart order valid data are sent to control with the message form in industrial ethernet protocol by s1: industrial operation station System station；

S2: control station unpacks to the industrial ethernet protocol message being received, and valid data are stored in control station data Behind storehouse, hart module is transmitted with the message form in can agreement；

S3:hart module unpacks to the can protocol massages being received, and valid data are stored in after hart module data base Constitute hart command forms and be sent to corresponding hart equipment；

Response message is returned to hart module after receiving hart order by s4:hart equipment, and hart module unpacks described response Information acquisition significant response data, and significant response data is transmitted to control station with the message form in can agreement；

The can protocol massages that s5: control station sends to the hart module being received unpack, by significant response data storage in After control station data base, industrial operation station is transmitted with the message form in industrial ethernet protocol.

2. according to claim 1 the hart site equipment management method based on real-time data base it is characterised in that described control System station data base is provided with two relief areas and is respectively used to keep in described industrial ethernet protocol message and can protocol massages.

3. according to claim 2 the hart site equipment management method based on real-time data base it is characterised in that described work The frame format of industrial Ethernet protocol massages includes: destination address, source address, type, data, crc, wherein data adopt udp number Include according to message format: ip head, udp head, application data.

4. according to claim 3 the hart site equipment management method based on real-time data base it is characterised in that described should Adopt self-defining data frame format with the form of data, comprising: check information one, user data and check information two.

5. according to claim 4 the hart site equipment management method based on real-time data base it is characterised in that described Hart module data base is provided with two relief areas and is respectively used to temporary can protocol massages and hart order.

6. a kind of hart Field Device Management System based on real-time data base is it is characterised in that include industrial operation station, control Stand, hart module and hart equipment；

Corresponding for hart order valid data are sent to by described industrial operation station with the message form in industrial ethernet protocol Control station；

Described control station unpacks to the industrial ethernet protocol message being received, and valid data are stored in control station data Behind storehouse, hart module is transmitted with the message form in can agreement；

Described hart module unpacks to the can protocol massages being received, and valid data are stored in hart module data base Constitute hart command forms afterwards and be sent to corresponding hart equipment；

Response message is returned to hart module after receiving hart order by described hart equipment, and hart module unpacks described response Information acquisition significant response data, and significant response data is transmitted to control station with the message form in can agreement；

The can protocol massages that described control station sends to the hart module being received unpack, by significant response data storage After control station data base, industrial operation station is transmitted with the message form in industrial ethernet protocol.

7. according to claim 6 the hart Field Device Management System based on real-time data base it is characterised in that described control Station processed is provided with DBM, and described DBM is provided with two relief areas and is respectively used to keep in described EPA Protocol massages and can protocol massages.

8. according to claim 7 the hart Field Device Management System based on real-time data base it is characterised in that described Hart module is provided with DBM, and described DBM is provided with two relief areas and is respectively used to temporary can agreement report Literary composition and hart order.