CN206323394U - Intelligent bus switching controller - Google Patents

Abstract

The utility model discloses an intelligent bus conversion controller, which comprises a conversion controller housing, a micro control unit and a power supply unit arranged in the conversion controller housing, and a first serial communication interface connected with the micro control unit signal And the second serial communication interface; the micro control unit is used to receive the data of the bus communication card, compare the data transmitted by the bus communication card with the stored data, judge the bus type of the bus communication card, and call the corresponding communication protocol conversion The program converts the data transmitted by the bus communication card into data recognizable by the actuator; the micro-control unit is used to receive the data of the actuator, and calls the corresponding communication protocol conversion program according to the bus type of the bus communication card judged , to convert the data transmitted by the actuator into data recognizable by the bus communication card. It reduces the load and memory of the main control CPU of the actuator, and at the same time realizes the seamless conversion or compatibility of various field buses.

Description

Intelligent Bus Conversion Controller

technical field

The utility model relates to the technical field of bus communication, in particular to an intelligent bus conversion controller for realizing data interaction between a bus communication card and a controller of an actuator.

Background technique

At present, there are two ways of intelligent actuator control in the market:

The first is to adopt the traditional control method, which has switch signal and 4-20mA analog signal control. Commonly used field bus control methods are PROFIBUS, FF, MODBUS, HART and so on.

The second is the use of fieldbus control. The intelligent actuator with field bus has functions required by various control technologies such as two-way communication, parameter online calibration, and fault self-diagnosis. At the same time, less auxiliary equipment needs to be used, no isolation, conversion and input and output modules such as DI, DO, AI, AO, etc., and a large number of signal cables, cable accessories and corresponding installation and maintenance work are reduced. The intelligence and fieldbus of electric actuators have become the inevitable development trend of technology in this field, and the bus-type intelligent electric actuators have brought broad development prospects.

However, the communication mode between each fieldbus and the actuator is to use the communication card to directly connect with the controller of the actuator for data interaction. Such a circuit structure requires a special design for each fieldbus intelligent actuator to configure Due to the specific hardware and software, the actuator with fieldbus can only be limited to a certain type of product, which not only has a long development cycle, but also increases the workload and memory requirements of the main controller of the actuator in this way, and increases the customer’s Limitation and complexity are caused in the selection of bus products and the upgrade of common products on site. When on-site customers need to upgrade the bus of ordinary intelligent actuators, they need to reconfigure and install the hardware, which increases the operating links and operating costs. Sometimes it is even necessary to replace the entire actuator, resulting in difficult construction, long renovation period, and increased renovation costs. Obviously, the existing intelligent actuators have certain limitations, and cannot fully meet the needs of customers and adapt to the needs of the market.

Contents of the invention

The purpose of this utility model is to provide an intelligent bus conversion controller for the deficiencies in the prior art, which reduces the load and memory of the main control CPU of the actuator, improves product performance, increases product diversity and adaptability, and simultaneously realizes The seamless conversion or compatibility of various field buses reduces auxiliary equipment and simplifies the operation process during upgrading and transformation, and reduces labor and design costs.

The purpose of this utility model is achieved by adopting the following scheme: an intelligent bus conversion controller, including a conversion controller housing, a micro-control unit and a power supply unit located in the conversion controller housing, and a signal connection with the micro-control unit The first serial communication interface and the second serial communication interface connected; the power supply unit is used to supply power for the entire conversion controller; the first serial communication interface is used to realize the communication between various bus communication cards and the micro control unit The data interaction between; the second serial communication interface is used to realize the data interaction between the micro control unit and the controller of the actuator; the micro control unit is used to receive the bus communication connected with the first serial communication interface Card data, and compare the data frame structure of the data transmitted by the bus communication card connected to the first serial communication interface with the data frame structure of various types of field bus data stored, and judge whether it is compatible with the first serial communication interface The bus type of the connected bus communication card, and call the corresponding communication protocol conversion program to classify and organize the data transmitted by the bus communication card connected to the first serial communication interface, and convert it into the data transmitted by the bus communication card connected to the second serial communication interface. The executor can output the identifiable data to the executor; the micro-control unit is used to receive the data of the executor, and call The corresponding communication protocol conversion program classifies and organizes the data transmitted by the actuator, converts the data into data recognizable by the bus communication card connected to the first serial communication interface, and sends it to the bus communication card.

The conversion controller of the utility model selects an MCU with a serial communication interface circuit for data transmission and reception and data conversion, and its interface with each communication card can be designed as a unified interface to realize the compatibility of various communication cards. It only needs to configure different communication protocol conversion programs in the MCU to process and convert the data of PROFIBUS bus communication card or FF bus communication card or MODBUS bus communication card or HART bus communication card to realize different fieldbus and execution control Organizational communication functions.

For field buses with standard protocols such as PROFIBUS bus or FF bus or MODBUS bus or HART bus, the utility model can identify and classify the data analyzed from various communication cards through the conversion controller, so as to Data interaction between various communication cards with standard communication protocols and actuator controllers, and finally realize data interaction between these field buses and actuator controllers. But for the field bus without standard communication protocol, the processing method of the present invention is to add a logic detection circuit, which is connected with the micro control unit, and the logic detection circuit is used for enforcing non-standard communication protocol Transformation provides a basis for judgment.

The logic detection circuit is used to detect the manual intervention signal, and transmit the detected manual intervention signal to the micro control unit, and the micro control unit is used to receive the manual intervention signal transmitted by the logic detection circuit, and judge that the manual intervention signal is valid , enforce a pre-set communication protocol conversion program, and no longer judge the bus type of the bus communication card connected to the first serial communication interface, so as to complete the data interaction between these field buses without standard protocols and the actuator controller . The manual intervention signal can be a hard-connected jumper signal, or a switch signal (such as a button switch signal) or a command signal, etc. Because there are many ways of manual intervention, as long as it can trigger the micro-control unit to forcibly execute a certain communication protocol conversion program set in advance, it is the solution to be protected by the utility model.

A level conversion circuit is provided between the micro control unit and the first serial communication interface, and the level conversion circuit is used to convert level signals meeting the requirements of the converter micro control unit and the communication card. That is, the level conversion circuit converts the level signal received by the first serial communication interface into a level signal that meets the requirements of the micro control unit and then transmits it to the micro control unit, and converts the level signal output by the micro control unit into a level signal that meets the requirements of the communication card. The required level signal is then transmitted to the communication card through the first serial communication interface.

An optocoupler isolation circuit is provided between the micro control unit and the first serial communication interface, and the communication signal is isolated by the optocoupler to improve the anti-interference performance and protect the micro control unit circuit.

The micro-control unit stores byte tables corresponding to various communication protocols, communication frame structures of various communication protocols, and communication protocol conversion programs corresponding to various bus types. Of course, the utility model can also not set byte lists of various communication protocols, communication frame structures of various communication protocols, and communication protocol conversion programs corresponding to various bus types in the micro-control unit, but according to the communication protocol to be connected According to the type of the card, a corresponding communication protocol conversion program is customized in the micro control unit to perform communication protocol conversion.

The second serial communication interface is a serial communication interface matched with the actuator, and the actuator is an intelligent actuator or an intelligent instrument.

The first serial communication interface is a serial communication interface that can be matched with various types of bus communication cards, such as the first serial communication interface can be designed as a bus communication card (such as PROFIBUS bus communication) Card, FF bus communication card, MODBUS bus communication card, HART bus communication card, etc.) all match the interface, the interface can be UART, SPI, I2C and other serial interfaces. Of course, we can also design the interface of each bus communication card to be compatible and unified.

The intelligent bus conversion controller has a redundant redundant interface.

There are multiple first serial communication interfaces for realizing data interaction between the bus communication card and the micro control unit, one first serial communication interface matches one type of bus communication card, and the plurality of first serial communication interfaces are respectively Match the same type or multiple types of bus communication cards, that is, the utility model can parallel multiple types of first serial communication interfaces.

The micro-control unit is provided with a storage module, a data sending and receiving module, a comparison and judgment module, and a communication protocol conversion module, and the storage module is used to store various types of field bus data and communication protocol conversion programs corresponding to various bus types; The data sending and receiving module is used to receive and send data, and the comparison and judgment module is used to compare the data received by the data sending and receiving module with the data in the storage module to obtain the required field bus type for communication; The communication protocol conversion module calls the communication protocol conversion program suitable for the field bus type according to the field bus type obtained by the comparison and judgment module to classify and organize the data, and converts it into a data format recognizable by the executive controller or the bus communication card Output, the micro-control unit is also provided with a hardware judgment module, the hardware judgment module is used to monitor the manual intervention signal, and when the manual intervention signal is judged to be valid, the pre-set field bus type is enforced to convert the communication protocol, and It is no longer necessary to judge the field bus type by comparing and judging modules.

The utility model has the advantages that: because the intelligent bus conversion controller of the present invention includes a conversion controller housing, a micro-control unit and a power supply unit arranged in the conversion controller housing, and a first signal connection with the micro-control unit A serial communication interface and a second serial communication interface. The intelligent bus switching controller of the utility model is separated from the actuator, and the first serial communication interface of the intelligent bus switching controller of the utility model can be connected with various bus communication cards, through the bus switching controller of the utility model Different protocol conversion programs or various communication protocol conversion programs and various bus communication cards can be configured to realize seamless conversion or compatibility of various field buses, and the actuator controller can communicate with various field buses to improve technical capabilities. And the diversity of actuator products, the actuator is no longer limited to a certain type of product, the utility model makes the actuator completely change this limitation, and meets the needs of customers in different periods.

The micro control unit is also provided with a hardware judging module, the hardware judging module is used to monitor the manual intervention signal, when judging that the manual intervention signal is valid, the pre-set field bus type is enforced to convert the communication protocol without further The field bus type is judged by comparing and judging modules. The purpose of this is to carry out manual intervention in advance to force the selection of the bus conversion type, reduce software work steps, improve conversion speed, and increase the diversity of communication card selection.

The intelligent bus conversion controller of the present invention is added between the bus communication card and the controller of the actuator to convert data in the middle layer, which can reduce the tasks of the controller of the actuator and the requirements for memory space in terms of performance, and improve the control accuracy and response. speed. In terms of development cost and economic benefits, the requirements for the serial communication interface circuit of the actuator controller (MCU) can be reduced. The actuator controller does not need to configure multiple serial ports to achieve multi-bus and redundancy requirements, and there is no need to replace the actuator control The device can be redesigned; the corresponding field bus control function can be realized only by adding the bus conversion controller of the utility model, which reduces the design and development cycle, saves design costs, responds quickly to the market, and generates economic benefits. At the same time, it can also expand the channels of other serial communication interfaces of the conversion controller to realize communication redundancy technology. Even if a channel fails, the actuator can still operate normally, improving the security of the communication network.

Description of drawings

Fig. 1 is the hardware functional block diagram of intelligent bus conversion controller of the present utility model;

Fig. 2 is a block flow diagram of the intelligent bus conversion controller of the present invention.

detailed description

Referring to Fig. 1 and Fig. 2, an intelligent bus conversion controller includes a conversion controller housing, a micro-control unit and a power supply unit arranged in the conversion controller housing, and a first serial bus connected to the micro-control unit A communication interface and a second serial communication interface; the power supply unit is used to supply power to the entire conversion controller; byte tables corresponding to various communication protocols and communication frame structures of various communication protocols are stored in the micro control unit And the communication protocol conversion program corresponding to various bus types. The first serial communication interface is used to realize the data interaction between various bus communication cards and the micro-control unit; the second serial communication interface is used to realize the data exchange between the micro-control unit and the controller of the actuator Interaction; the micro control unit is used to receive the data of the bus communication card connected with the first serial communication interface, and combine the data transmitted by the bus communication card connected with the first serial communication interface with various types of on-site stored Comparing the bus data, judging the bus type of the bus communication card connected to the first serial communication interface, and calling the corresponding communication protocol conversion program, sorting out the data transmitted by the bus communication card connected to the first serial communication interface , and convert it into data recognizable by the actuator connected to the second serial communication interface, and then output it to the actuator; The bus type of the bus communication card connected to the serial communication interface, call the corresponding communication protocol conversion program, classify and organize the data transmitted by the actuator, and convert it into a bus communication card connected to the first serial communication interface. The data is then sent to the bus communication card. The second serial communication interface is a serial communication interface matched with the actuator, and the actuator is an intelligent actuator or an intelligent instrument.

A level conversion circuit is provided between the micro control unit and the first serial communication interface, and the level conversion circuit is used to convert the received level signal into a level signal that meets the required voltage value for output. That is, the level conversion circuit converts the level signal received by the first serial communication interface into a level signal that meets the requirements of the micro control unit and then transmits it to the micro control unit, and converts the level signal output by the micro control unit into a level signal that meets the requirements of the communication card. The required level signal is then transmitted to the first serial communication interface. An isolation circuit is provided between the micro control unit and the first serial communication interface.

The first serial communication interface is a serial communication interface that can be matched with various types of bus communication cards, such as the first serial communication interface can be designed as a bus communication card (such as PROFIBUS bus communication) Card, FF bus communication card, MODBUS bus communication card, HART bus communication card, etc.) all match the interface, the interface can be UART, SPI, I2C and other serial interfaces. Of course, we can also design the interface of each bus communication card to be compatible and unified. The intelligent bus conversion controller has a redundant redundant interface. The control chip of the bus conversion controller of this embodiment selects the MCU with a plurality of asynchronous serial communication interfaces (UART) for data transmission and reception. One or more interfaces can be set. In this embodiment, the MCU with three serial communication interfaces is used for data transmission and reception and data conversion, and two serial communication interfaces are used to realize data interaction between various bus communication cards and micro control units. One of the communication interfaces 1 and 2 is a backup redundant interface. The interface with each communication card is designed as a unified interface to realize the compatibility of various communication cards. Another serial communication interface 3 is used to realize data interaction between the micro control unit and the controller of the actuator.

Certainly, the first serial communication interface that this utility model is used to realize the data interaction between the bus communication card and the micro control unit can also set multiple, one first serial communication interface matches a type of bus communication card, multiple The first serial communication interfaces match the same type or multiple types of bus communication cards respectively.

When the first serial communication interface of the intelligent bus conversion controller is connected to the PROFIBUS bus communication card, the micro-control unit receives the data of the PROFIBUS bus communication card, and combines the data transmitted by the PROFIBUS bus communication card with the stored various types of Comparing the field bus data, it is judged that the bus type of the PROFIBUS bus communication card or the field bus type required for communication is PROFIBUS bus, and the communication protocol conversion program suitable for PROFIBUS bus is called to convert the data transmitted by the PROFIBUS bus communication card Sorting and sorting, and converting it into data recognizable by the actuator connected to the second serial communication interface, and then outputting it to the actuator; the micro-control unit receives the data of the actuator, and calls the communication protocol conversion applicable to the PROFIBUS bus The program classifies and organizes the data transmitted by the actuator, and converts the data into data recognizable by the PROFIBUS communication card and sends it to the PROFIBUS communication card.

When the first serial communication interface of the intelligent bus conversion controller is connected to the FF bus communication card, the micro-control unit receives the data of the FF bus communication card, and combines the data transmitted by the FF bus communication card with the stored various types of Comparing the field bus data, it is judged that the bus type of the FF bus communication card or the field bus type required for communication is the FF bus, and the communication protocol conversion program suitable for the FF bus is called to convert the data transmitted by the FF bus communication card Sorting and sorting, and converting it into data recognizable by the actuator connected to the second serial communication interface, and then outputting it to the actuator; the micro-control unit receives the data of the actuator, and calls the communication protocol conversion applicable to the FF bus The program classifies and organizes the data transmitted by the actuator, converts them into data recognizable by the FF bus communication card, and sends them to the FF bus communication card.

When the first serial communication interface of the intelligent bus conversion controller is connected to the MODBUS bus communication card, the micro-control unit receives the data of the MODBUS bus communication card, and combines the data transmitted by the MODBUS bus communication card with the stored various types of Comparing the field bus data, it is judged that the bus type of the MODBUS bus communication card or the field bus type required for communication is the MODBUS bus, and the communication protocol conversion program suitable for the MODBUS bus is called to convert the data transmitted by the MODBUS bus communication card Sorting and sorting, and converting it into data recognizable by the actuator connected to the second serial communication interface, and then outputting it to the actuator; the micro-control unit receives the data of the actuator, and calls the communication protocol conversion applicable to the MODBUS bus The program classifies and arranges the data transmitted by the actuator, converts the data into data recognizable by the MODBUS communication card, and sends it to the MODBUS communication card.

When the first serial communication interface of the intelligent bus conversion controller is connected to the HART bus communication card, the micro-control unit receives the data of the HART bus communication card, and combines the data transmitted by the HART bus communication card with the stored various types of Comparing the field bus data, it is judged that the bus type of the HART bus communication card or the field bus type required for communication is the HART bus, and the communication protocol conversion program suitable for the HART bus is called to convert the data transmitted by the HART bus communication card Sorting and sorting, and converting it into data recognizable by the actuator connected to the second serial communication interface, and then outputting it to the actuator; the micro-control unit receives the data of the actuator, and calls the communication protocol conversion applicable to the HART bus The program classifies and organizes the data transmitted by the actuator, and converts the data into data recognizable by the HART bus communication card and sends it to the HART bus communication card.

The conversion controller of the utility model selects an MCU with a serial communication interface circuit for data transmission and reception and data conversion, and its interface with each communication card can be designed as a unified interface to realize the compatibility of various communication cards. Only need to configure different communication protocol conversion programs in the MCU to process and convert the data transmitted by bus communication cards such as PROFIBUS bus communication card or FF bus communication card or MODBUS bus communication card or HART bus communication card, so as to realize different The communication function between the field bus and the executive control mechanism.

For field buses with standard protocols such as PROFIBUS bus or FF bus or MODBUS bus or HART bus, the utility model can identify and classify the data analyzed from various communication cards through the conversion controller, so as to Data interaction between various communication cards with standard communication protocols and actuator controllers, and finally realize data interaction between these field buses and actuator controllers. But for the field bus without standard communication protocol, the processing method of the present invention is to add a logic detection circuit, which is connected with the micro control unit, and the logic detection circuit is used for enforcing non-standard communication protocol Transformation provides a basis for judgment.

The logic detection circuit is used to detect the manual intervention signal, and transmit the detected manual intervention signal to the micro control unit, and the micro control unit is used to receive the manual intervention signal transmitted by the logic detection circuit, and judge that the manual intervention signal is valid , forcibly execute a preset communication protocol conversion program, and no longer judge the bus type of the bus communication card connected to the first serial communication interface, so as to complete the data interaction between these field buses without standard protocols and the actuator controller .

The micro-control unit is provided with a storage module, a data sending and receiving module, a comparison and judgment module, and a communication protocol conversion module, and the storage module is used to store various types of field bus data and communication protocol conversion programs corresponding to various bus types; The data sending and receiving module is used to receive and send data, and the comparison and judgment module is used to compare the data received by the data sending and receiving module with the data in the storage module to obtain the required field bus type for communication; The communication protocol conversion module calls the communication protocol conversion program suitable for the field bus type according to the field bus type obtained by the comparison and judgment module to classify and organize the data, and converts it into a data format recognizable by the executive controller or the bus communication card output. The micro control unit is also provided with a hardware judging module, the hardware judging module is used to monitor the manual intervention signal, when judging that the manual intervention signal is valid, the pre-set field bus type is enforced to convert the communication protocol without further The field bus type is judged by comparing and judging modules.

The utility model configures a variety of protocol conversion programs for the bus conversion controller, and receives and converts information from communication cards such as PROFIBUS bus communication card, FF bus communication card, MODBUS bus communication card or HART communication card through the first serial communication interface. , and send it to the main control MCU of the actuator through the second serial communication interface, and participate in the control of the actuator. At the same time, the bus conversion controller receives the equipment data of the actuator through the second serial communication interface, then performs data conversion, and sends the converted data to the corresponding bus communication card through the first serial communication interface, so as to realize the connection with the PROFIBUS bus or Communication function of buses such as FF bus or MODBUS bus or HART bus.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (10)

1. An intelligent bus conversion controller, characterized in that: comprise a conversion controller housing, a micro-control unit and a power supply unit located in the conversion controller housing, and the first serial communication unit connected with the micro-control unit signal interface and a second serial communication interface; the power supply unit is used to supply power to the entire conversion controller; the first serial communication interface is used to realize data interaction between various bus communication cards and micro control units; the The second serial communication interface is used to realize the data interaction between the micro control unit and the actuator; the micro control unit is used to receive the data of the bus communication card connected with the first serial communication interface, and communicate with the first serial communication interface Compare the data frame structure of the data transmitted by the bus communication card connected to the serial communication interface with the stored data frame structures of various types of field buses, judge the bus type of the bus communication card connected to the first serial communication interface, and call the corresponding The communication protocol conversion program classifies and sorts the data transmitted by the bus communication card connected to the first serial communication interface, and converts it into data recognizable by the actuator connected to the second serial communication interface, and then outputs it to the actuator ; The micro-control unit is used to receive the data of the actuator, according to the bus type of the bus communication card connected with the first serial communication interface that has been judged, call the corresponding communication protocol conversion program, and execute the The data transmitted by the device is sorted and converted into data recognizable by the bus communication card connected to the first serial communication interface, and then sent to the bus communication card. 2. The intelligent bus conversion controller according to claim 1, characterized in that: said micro-control unit is connected with a logic detection circuit, said logic detection circuit is used to detect manual intervention signal, and detects manual intervention signal Passed to the micro control unit, the micro control unit is used to receive the manual intervention signal transmitted by the logic detection circuit, and when the manual intervention signal is judged to be valid, it will forcibly execute a certain communication protocol conversion program set in advance, and no longer judge whether it is the same as the first The bus type of the bus communication card connected to the serial communication interface. 3. The intelligent bus conversion controller according to claim 1, characterized in that: a level conversion circuit is provided between the micro control unit and the first serial communication interface, and the level conversion circuit is used to convert the received The level signal is converted to the level signal output that meets the requirements of the micro control unit. 4. The intelligent bus conversion controller according to claim 1, characterized in that: an optocoupler isolation circuit is provided between the micro control unit and the first serial communication interface. 5 . The intelligent bus conversion controller according to claim 1 , characterized in that: said micro-control unit stores communication protocol conversion programs corresponding to various bus types. 6 . 6. The intelligent bus conversion controller according to claim 1, characterized in that: the first serial communication interface is a serial communication interface that can match with various types of bus communication cards. 7. The intelligent bus conversion controller according to claim 1 or 6, characterized in that: the intelligent bus conversion controller is provided with a spare redundant interface. 8. The intelligent bus conversion controller according to claim 1, characterized in that: the first serial communication interface for realizing data interaction between the bus communication card and the micro-control unit is provided with multiple, one first serial communication interface The interface matches one type of bus communication card, multiple first serial communication interfaces match the same type of bus communication card, or match multiple types of bus communication cards respectively, so as to realize the communication between the intelligent bus conversion controller and various types of bus Cards match. 9. The intelligent bus conversion controller according to claim 1, characterized in that: the micro-control unit is provided with a storage module, a data sending and receiving module, a comparison and judgment module and a communication protocol conversion module, and the storage module is used for Store various types of field bus data tables and data frame structures of communication protocols corresponding to various bus types; the data sending and receiving module is used to receive and send data, and the comparison and judgment module is used to send and receive data received by the data sending and receiving module The data frame structure of the data is compared with the preserved data frame structure in the storage module to obtain the required field bus type for communication; the communication protocol conversion module, according to the field bus type obtained by the comparison and judgment module, calls the The communication protocol conversion program of the above-mentioned fieldbus type classifies and organizes the data, and converts it into a data format recognizable by the executive controller or the bus communication card for output. 10. The intelligent bus switching controller according to claim 9, characterized in that: said micro-control unit is also provided with a hardware judging module, said hardware judging module is used to monitor the manual intervention signal, and judge whether the manual intervention signal is effective , enforce the pre-set fieldbus type to convert the communication protocol, instead of judging the fieldbus type by comparing and judging modules.