CN114238193B - Device for data interaction between PROFIBUS-DP bus and BLVDS bus - Google Patents
Device for data interaction between PROFIBUS-DP bus and BLVDS bus Download PDFInfo
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- CN114238193B CN114238193B CN202210168494.9A CN202210168494A CN114238193B CN 114238193 B CN114238193 B CN 114238193B CN 202210168494 A CN202210168494 A CN 202210168494A CN 114238193 B CN114238193 B CN 114238193B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
- G06F13/4286—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a handshaking protocol, e.g. RS232C link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
Abstract
The invention discloses a device for data interaction between a PROFIBUS-DP bus and a BLVDS bus, which aims at the problem that the data between the conventional PROFIBUS-DP bus and the BLVDS bus cannot be interconnected and interacted, connects the PROFIBUS-DP bus through an RS485 interface circuit, receives the data of the PROFIBUS-DP bus and transmits the data to a communication control circuit; a first data processing circuit in the communication control circuit processes PROFIBUS-DP bus data into BLVDS data and transmits the BLVDS data to a BLVDS interface circuit; the BLVDS interface circuit is connected with the BLVDS bus and transmits BLVDS data to the BLVDS bus, so that data transmission from the PROFIBUS-DP bus to the BLVDS bus is realized; when data is transmitted from the BLVDS bus to the PROFIBUS-DP bus, a second data processing circuit in the communication control circuit receives BLVDS bus data transmitted by the BLVDS interface circuit, processes the BLVDS bus data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the RS485 interface circuit, and then the data is transmitted to the PROFIBUS-DP bus, so that data transmission from the BLVDS bus to the PROFIBUS-DP bus is realized, and the purpose of data interaction between the PROFIBUS-DP bus and the BLVDS bus is achieved.
Description
Technical Field
The invention belongs to the technical field of communication data processing, and particularly relates to a device for data interaction between a PROFIBUS-DP bus and a BLVDS bus.
Background
PROFIBUS is an internationalized, open, field bus standard independent of the equipment manufacturer, which was approved as the european industrial standard (EN50170) in 1995, as the international standard (IEC61158) in 1999, and was set as the national industry standard in china in 2001. The PROFIBUS bus technology has been widely used in automation processes in the fields of manufacturing automation, process industrial automation, building automation, and power and traffic.
PROFIBUS comprises PROFIBUS-DP, PROFIBUS-PA and PROFIBUS-FMS. The PROFIBUS-DP is mainly used for high-speed data transmission between a field device level control system and distributed I/O devices, and solves the communication task between an automatic control system and the distributed field devices through a high-speed serial bus. The PROFIBUS-DP can replace the on-site 24V or 4-20 mA parallel signal transmission technology.
The PROFIBUS-DP system is simple to install, the data transmission rate can reach 12MBit/s at most, and various network topologies (bus type, star type and ring type) and optional optical fiber double-ring redundancy are supported. It is a bus system working in master/slave mode, and the master station function can be completed by automatic control instrument/system (type 1 master station) or a PC (type 2 master station). The class 1 master station completes the automatic regulation and control functions and completely accesses the field instrument through circulating and non-circulating messages. The class 2 master station can exchange uploading, downloading and diagnosing data with the class 1 master station through the non-cyclic message when needed, and exchange data with a field instrument.
BLVDS is a new family of bus interface circuits based on LVDS technology, dedicated to the implementation of multi-drop cable or backplane applications, with low voltage differential signaling of about 250mV and fast transition times. This allows the product to achieve high data transmission rates from 100 Mbps to over 1 Gbps. Furthermore, the low voltage swing may reduce power consumption and noise to a minimum. The differential data transmission configuration provides a common mode range of +/-1V and hot swappable devices of the active bus.
However, for various reasons, the PROFIBUS-DP bus and the BLVDS bus cannot be compatible with each other, information sharing cannot be realized, and it is difficult to realize interoperation between different protocol devices.
Disclosure of Invention
The invention aims to provide a device for data interaction between a PROFIBUS-DP bus and a BLVDS bus, which solves the problem that data cannot be interconnected and interacted between the PROFIBUS-DP bus and the BLVDS bus, can enable equipment or a device with the BLVDS bus to be used as slave equipment of the PROFIBUS-DP bus in a network, and can communicate with any master equipment supporting a PROFIBUS-DP protocol.
In order to solve the problems, the technical scheme of the invention is as follows:
an apparatus for data interaction between a PROFIBUS-DP bus and a BLVDS bus, comprising: RS485 interface circuit, communication control circuit and BLVDS interface circuit;
the RS485 interface circuit is connected with a PROFIBUS-DP bus, receives the data of the PROFIBUS-DP bus and transmits the data to the communication control circuit;
the communication control circuit comprises a first data processing circuit, wherein the first data processing circuit is used for receiving data transmitted by the RS485 interface circuit, processing the data into BLVDS data and transmitting the BLVDS data to the BLVDS interface circuit; the BLVDS interface circuit is connected with a BLVDS bus, and transmits BLVDS data output by the first data processing circuit to the BLVDS bus, so that data transmission from a PROFIBUS-DP bus to the BLVDS bus is realized;
the communication control circuit further comprises a second data processing circuit, the second data processing circuit receives BLVDS bus data transmitted by the BLVDS interface circuit, processes the BLVDS bus data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the RS485 interface circuit, and the RS485 interface circuit transmits the PROFIBUS-DP protocol data to the PROFIBUS-DP bus, so that data transmission from the BLVDS bus to the PROFIBUS-DP bus is realized.
According to an embodiment of the present invention, the first data processing circuit includes a PROFIBUS-DP data transceiving block, a PROFIBUS-DP protocol block, a protocol conversion block, a BLVDS data group packet block, and a BLVDS data transmission block;
the PROFIBUS-DP data receiving and sending block is used for checking PROFIBUS-DP bus data, judging whether the data is an invalid instruction or not, and discarding the data if the data is the invalid instruction; if not, transmitting the PROFIBUS-DP bus data to the PROFIBUS-DP protocol block;
the PROFIBUS-DP protocol block analyzes the PROFIBUS-DP bus data to obtain PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the protocol conversion block;
the protocol conversion block encodes PROFIBUS-DP protocol data to convert the data into a data signal conforming to a BLVDS bus encoding mode, and transmits the data signal to the BLVDS data packet block;
the BLVDS data group packet block packs data signals according to a BLVDS protocol and sends the data signals to the BLVDS data sending block;
the BLVDS data sending block adds an address and a check code to the group data and then sends the group data to the BLVDS interface circuit.
According to an embodiment of the invention, the second data processing circuit comprises a BLVDS data receiving block, a BLVDS data parsing block, a protocol conversion block, a PROFIBUS-DP protocol block, and a PROFIBUS-DP data transceiving block;
the BLVDS data receiving block is used for receiving BLVDS bus data, carrying out frame check on the BLVDS bus data and transmitting the BLVDS bus data to the BLVDS data analyzing block;
the BLVDS data analysis block analyzes BLVDS bus data to obtain BLVDS protocol data and transmits the BLVDS protocol data to the protocol conversion block;
the protocol conversion block converts BLVDS protocol data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the protocol conversion block;
and the PROFIBUS-DP protocol block groups and packages the PROFIBUS-DP protocol data and transmits the data to the PROFIBUS-DP data receiving and transmitting block.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
the invention provides a device for data interaction between a PROFIBUS-DP bus and a BLVDS bus, which aims at the problem that the data between the conventional PROFIBUS-DP bus and the BLVDS bus cannot be interconnected and interacted, is connected with the PROFIBUS-DP bus through an RS485 interface circuit, receives the data of the PROFIBUS-DP bus and transmits the data to a communication control circuit; a first data processing circuit in the communication control circuit processes PROFIBUS-DP bus data into BLVDS data and transmits the BLVDS data to a BLVDS interface circuit; the BLVDS interface circuit is connected with the BLVDS bus and transmits BLVDS data to the BLVDS bus, so that data transmission from the PROFIBUS-DP bus to the BLVDS bus is realized; when data is transmitted from the BLVDS bus to the PROFIBUS-DP bus, a second data processing circuit in the communication control circuit receives BLVDS bus data transmitted by the BLVDS interface circuit, processes the BLVDS bus data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the RS485 interface circuit, and then transmits the PROFIBUS-DP bus to realize data transmission from the BLVDS bus to the PROFIBUS-DP bus, so that the aim of data interaction between the PROFIBUS-DP bus and the BLVDS bus is fulfilled, equipment or a device with the BLVDS bus can be used as slave equipment of the PROFIBUS-DP bus in a network, and can be communicated with any master equipment supporting the PROFIBUS-DP protocol.
Drawings
FIG. 1 is a block diagram of an apparatus for data interaction between a PROFIBUS-DP bus and a BLVDS bus according to an embodiment of the present invention;
fig. 2 is a block diagram of a communication control circuit according to an embodiment of the invention.
Detailed Description
The following describes a device for data exchange between a PROFIBUS-DP bus and a BLVDS bus according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
The embodiment provides a device for data interaction between the PROFIBUS-DP bus and the BLVDS bus, aiming at the problem that the data between the conventional PROFIBUS-DP bus and the BLVDS bus cannot be interconnected and interacted, so that the data interaction between the PROFIBUS-DP bus and the BLVDS bus is realized, equipment or the device with the BLVDS bus can be used as slave station equipment of the PROFIBUS-DP bus in a network, and can communicate with any master station equipment supporting the PROFIBUS-DP protocol.
Referring to fig. 1, the apparatus for data interaction between the PROFIBUS-DP bus and the BLVDS bus comprises: an RS485 interface circuit 1, a communication control circuit 2 and a BLVDS interface circuit 3; the RS485 interface circuit 1 is connected with a PROFIBUS-DP bus through a twisted pair, receives PROFIBUS-DP bus data and transmits the data to the communication control circuit 2; the first data processing circuit in the communication control circuit 2 processes the data of the PROFIBUS-DP bus into BLVDS protocol data and then transmits the BLVDS protocol data to the BLVDS interface circuit 3, and the BLVDS protocol data is transmitted to the BLVDS bus through the BLVDS interface circuit 3, so that the data transmission from the PROFIBUS-DP bus to the BLVDS bus is realized. The BLVDS interface circuit 3 is an interface circuit that can be used with a BLVDS bus.
When data is transmitted from the BLVDS bus to the PROFIBUS-DP bus, the second data processing circuit in the communication control circuit 2 receives BLVDS bus data transmitted by the BLVDS interface circuit 3, processes the BLVDS bus data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the RS485 interface circuit 1, and then transmits the PROFIBUS-DP bus to the BLVDS bus, so that data transmission from the BLVDS bus to the PROFIBUS-DP bus is realized, and the purpose of data interaction between the PROFIBUS-DP bus and the BLVDS bus is achieved.
Referring to fig. 2, the communication control circuit 2 includes a first data processing circuit and a second data processing circuit, wherein the first data processing circuit includes a PROFIBUS-DP data transceiving block, a PROFIBUS-DP protocol block, a protocol conversion block, a BLVDS data packet block, and a BLVDS data transmission block.
The PROFIBUS-DP data receiving and sending block is used for checking PROFIBUS-DP bus data, judging whether the data is an invalid instruction or not, and discarding the data if the data is the invalid instruction; and if not, transmitting the PROFIBUS-DP bus data to the PROFIBUS-DP protocol block.
Wherein, the data of the PROFIBUS-DP bus is the data which accords with the data frame format of the PROFIBUS-DP protocol, the definition of the data frame format of the PROFIBUS-DP protocol please refer to the table 1:
TABLE 1
When the PROFIBUS-DP bus data is verified, the PROFIBUS-DP bus data is verified by adopting an accumulation and operation method, namely all data in a frame of PROFIBUS-DP protocol data are added, the sum value is compared with the received verification value according to the last bit in a 16-system format, if the sum value is different from the received verification value, the sum value is judged to be an invalid instruction, and the data frame is discarded without processing; if the data frame is the same as the data frame, the data frame is judged to be a valid instruction, and the data frame is transmitted to a PROFIBUS-DP protocol block.
The PROFIBUS-DP protocol block analyzes the PROFIBUS-DP bus data, removes useless data such as data of function codes, frame check, data length and the like, extracts data DU in a data domain to obtain application data about a user in the PROFIBUS-DP protocol data, and transmits the application data to the protocol conversion block.
The protocol conversion block encodes and converts PROFIBUS-DP protocol data (namely data of a data domain) into a data signal conforming to a BLVDS bus encoding mode, and transmits the data signal to the BLVDS data group packet block.
That is, the protocol conversion block fills the extracted data with data in the format of the BLVDS bus protocol. Namely, the DU data in the PROFIBUS-DP data frame is transferred to the BLVDS dedicated transmission buffer area, and when the BLVDS protocol data is transmitted, the DU data is filled into the data area in the BLVDS protocol data format. The BLVDS protocol data frame format definition please refer to table 2:
TABLE 2
| Command word | Slave station address | Offset address from slave register | Data zone length | Data field | Work counter | Frame check |
| CMD | SLAVE | OFFSET | LEN | DATA | WKC | CRC |
And the BLVDS data group packet block is used for grouping the data signals according to the BLVDS protocol and sending the data signals to the BLVDS data sending block. The BLVDS data packet block carries out packet sending on the received BLVDS protocol data according to the preset data size and sends the data to the BLVDS data sending block.
The BLVDS data transmission block adds an address and a check code to the packet data and transmits the result to the BLVDS interface circuit 3. The BLVDS interface circuit 3 arbitrates and judges whether the BLVDS bus is idle, and transmits data to the BLVDS bus when the BLVDS bus is idle.
The first data processing circuit in the communication control circuit 2 realizes data transmission from the PROFIBUS-DP bus to the BLVDS bus, and the second data processing circuit in the communication control circuit 2 has a function opposite to that of the first data processing circuit, that is, realizes data transmission from the BLVDS bus to the PROFIBUS-DP bus.
The second data processing circuit comprises a BLVDS data receiving block, a BLVDS data analyzing block, a protocol conversion block, a PROFIBUS-DP protocol block and a PROFIBUS-DP data receiving and transmitting block.
The BLVDS data receiving block is used for receiving BLVDS bus data, and transmitting the BLVDS bus data to the BLVDS data analyzing block after performing frame verification on the BLVDS bus data.
The BLVDS DATA analysis block analyzes the BLVDS bus DATA, extracts DATA DATA in a DATA domain to obtain application DATA about users in the BLVDS protocol DATA, and transmits the application DATA to the protocol conversion block.
The protocol conversion block converts the user application data in the BLVDS protocol data into PROFIBUS-DP protocol data in an encoding mode, and transmits the PROFIBUS-DP protocol data to the protocol conversion block. Namely, the protocol conversion block transfers the DATA in the BLVDS DATA frame to the special transmission buffer area for PROFIBUS-DP, and when the PROFIBUS-DP protocol DATA is transmitted, the DATA is filled into the DATA field in the PROFIBUS-DP protocol DATA format.
The PROFIBUS-DP protocol block groups and packages the PROFIBUS-DP protocol data, transmits the data to the PROFIBUS-DP data receiving and transmitting block, and transmits the data to the PROFIBUS-DP bus through the PROFIBUS-DP data receiving and transmitting block.
The first data processing circuit and the second data processing circuit can share the PROFIBUS-DP data receiving and transmitting block, the PROFIBUS-DP protocol block and the protocol conversion block to realize opposite data processing processes. That is to say, the PROFIBUS-DP data transceiving block, the PROFIBUS-DP protocol block and the protocol conversion block have the function of bidirectional transmission.
The communication control circuit 2 in this embodiment may further include a BLVDS data transceiving block, configured to receive data transmitted by the BLVDS data transceiving block, and send the data to the BLVDS interface circuit; or receiving the BLVDS bus data transmitted by the BLVDS interface circuit and sending the data to the BLVDS data receiving block.
In practical application, the communication control circuit 2 may be composed of an appropriate ARM circuit and an FPGA circuit, so as to implement the function of data interaction between the PROFIBUS-DP bus and the BLVDS bus.
In summary, the apparatus for data interaction between the PROFIBUS-DP bus and the BLVDS bus in this embodiment implements data interaction between the PROFIBUS-DP bus and the BLVDS bus, and can enable the device or apparatus having the BLVDS bus to be used as a slave device of the PROFIBUS-DP bus in a network, and can communicate with any master device supporting the PROFIBUS-DP protocol.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (1)
1. An apparatus for data interaction between a PROFIBUS-DP bus and a BLVDS bus, comprising: RS485 interface circuit, communication control circuit and BLVDS interface circuit;
the RS485 interface circuit is connected with a PROFIBUS-DP bus, receives the data of the PROFIBUS-DP bus and transmits the data to the communication control circuit;
the communication control circuit comprises a first data processing circuit and a second data processing circuit, wherein the first data processing circuit is used for receiving data transmitted by the RS485 interface circuit, processing the data into BLVDS data and transmitting the BLVDS data to the BLVDS interface circuit; the BLVDS interface circuit is connected with a BLVDS bus, and transmits BLVDS data output by the first data processing circuit to the BLVDS bus, so that data transmission from a PROFIBUS-DP bus to the BLVDS bus is realized;
the second data processing circuit receives BLVDS bus data transmitted by the BLVDS interface circuit, processes the BLVDS bus data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the RS485 interface circuit, and the RS485 interface circuit transmits the PROFIBUS-DP protocol data to the PROFIBUS-DP bus so as to realize data transmission from the BLVDS bus to the PROFIBUS-DP bus;
the first data processing circuit comprises a PROFIBUS-DP data receiving and transmitting block, a PROFIBUS-DP protocol block, a protocol conversion block, a BLVDS data group packet block and a BLVDS data transmitting block;
the PROFIBUS-DP data receiving and sending block is used for checking PROFIBUS-DP bus data, judging whether the data is an invalid instruction or not, and discarding the data if the data is the invalid instruction; if not, transmitting the PROFIBUS-DP bus data to the PROFIBUS-DP protocol block;
the PROFIBUS-DP protocol block analyzes the PROFIBUS-DP bus data to obtain PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the protocol conversion block;
the protocol conversion block encodes PROFIBUS-DP protocol data to convert the data into a data signal conforming to a BLVDS bus encoding mode, and transmits the data signal to the BLVDS data packet block;
the BLVDS data group packet block is used for grouping data signals according to a BLVDS protocol and sending the data signals to the BLVDS data sending block;
the BLVDS data sending block adds an address and a check code to the group data and sends the group data to the BLVDS interface circuit;
the second data processing circuit comprises a BLVDS data receiving block, a BLVDS data analyzing block, a protocol conversion block, a PROFIBUS-DP protocol block and a PROFIBUS-DP data receiving and transmitting block;
the BLVDS data receiving block is used for receiving BLVDS bus data, carrying out frame check on the BLVDS bus data and transmitting the BLVDS bus data to the BLVDS data analyzing block;
the BLVDS data analysis block analyzes BLVDS bus data to obtain BLVDS protocol data and transmits the BLVDS protocol data to the protocol conversion block;
the protocol conversion block converts BLVDS protocol data into PROFIBUS-DP protocol data and transmits the PROFIBUS-DP protocol data to the protocol conversion block;
and the PROFIBUS-DP protocol block transmits PROFIBUS-DP protocol data to the PROFIBUS-DP data receiving and transmitting block after grouping and packaging the PROFIBUS-DP protocol data.
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