CN202513948U

CN202513948U - Master-slave mode protocol conversion gateway from Ethernet to ProfiBus decentralized periphery (PROFIBUS-DP)

Info

Publication number: CN202513948U
Application number: CN2012201580369U
Authority: CN
Inventors: 方彦军; 胥军; 李昕; 孔政敏
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2012-04-16
Filing date: 2012-04-16
Publication date: 2012-10-31
Anticipated expiration: 2022-04-16

Abstract

The utility model discloses a master-slave mode protocol conversion gateway from Ethernet to ProfiBus decentralized periphery (PROFIBUS-DP). The master-slave mode protocol conversion gateway comprises a PROFIBUS-DP communication interface circuit, an Ethernet interface circuit and a data repeat circuit, wherein both the PROFIBUS-DP communication interface circuit and the Ethernet interface circuit are connected with the data repeat circuit, the PROFIBUS-DP communication interface circuit is used for receiving, transmitting and processing data from a PROFIBUS-DP master station and the data repeat circuit, the Ethernet interface circuit is used for receiving, transmitting and processing data from Ethernet equipment and the data repeat circuit, and the data repeat circuit is used for transmitting data from the PROFIBUS-DP master station to an application layer of an Ethernet communication station or transmitting data from the Ethernet equipment to a PROFIBUS-DP user interface. The master-slave mode protocol conversion gateway achieves device-level information exchange between the ProfiBus and the Ethernet, and has the advantages of being high in real-time performance, low in cost, and simple and flexible in information integration method.

Description

Ethernet is to the master-slave mode protocol conversion gateway of PROFIBUS-DP

Technical field

The utility model belongs to unidirectional protocol transfer gateway field, relates in particular to the master-slave mode protocol conversion gateway of a kind of Ethernet to PROFIBUS-DP.

Background technology

Because the objective reality of a large amount of incompatible networks, between network agreement be converted into unavoidable problem, also be the hot issue in the present communications field.At present most of research concentrates between commercial Ethernet or in the protocol conversion between computer network, and to the research of protocol conversion between Ethernet and the fieldbus rare report also.

Because the definition of most of Ethernet and each layer protocol of fieldbus is all inequality, so can only adopt protocol conversion gateway to realize interconnected between them.The protocol conversion gateway of research generally all belongs to bidirectional gateway both at home and abroad at present; And mainly concentrate on CAN (Controller Area Network to the research that is used for the protocol conversion gateway between Ethernet and the fieldbus; Controller local area network) in the protocol conversion of bus and Ethernet, the CAN bus is non-master-slave mode bus structures.Because the protocol data form of master-slave mode fieldbus definition is more; And to follow strict standard during network configuration; Therefore the protocol conversion gateway that is used for Ethernet and master-slave mode fieldbus is more complicated, and the research to the protocol conversion between master-slave mode fieldbus and the Ethernet does not at present almost have.

The utility model content

To the deficiency that prior art exists, the utility model provides the master-slave mode protocol conversion gateway of a kind of simple in structure, real-time is high, the information integration cost is low Ethernet to PROFIBUS-DP.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

Ethernet comprises to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

PROFIBUS-DP communication interface circuit, ethernet interface circuit and data forwarding circuit, wherein:

The PROFIBUS-DP communication interface circuit comprises CPU element 1, reset circuit 2, decoding circuit 3, establishes site circuit 4, address latch 5, the outer random asccess memory 6 of sheet and DP communication unit 7; Reset circuit 2 links to each other with CPU element 1; CPU element 1, address latch 5, the outer random asccess memory 6 of sheet, DP communication unit 7 link to each other with address bus, data/address bus respectively; One end link address bus of decoding circuit 3, the other end connect establishes site circuit 4, establishes site circuit 4 and also links to each other with data/address bus;

Ethernet interface circuit comprises ethernet mac controller 8, ethernet physical layer interface circuit 9, first peripheral circuit 10, second peripheral circuit 11; Ethernet physical layer interface circuit 9, first peripheral circuit 10 all link to each other with ethernet mac controller 8, and second peripheral circuit 11 links to each other with ethernet physical layer interface circuit 9;

The PROFIBUS-DP communication interface circuit links to each other with the data forwarding circuit through CPU element 1, and ethernet interface circuit links to each other with the data forwarding circuit through ethernet mac controller 8.

Above-mentioned DP communication unit 7 is connected to form by driver, optocoupler, protocol chip in order, and DP communication unit 7 is connected with the Profibus-DP bus through driver, is connected with address bus, data/address bus through protocol chip; The driver that is adopted is the RS-485 driver, and protocol chip is the interface chip of SPC3 model.

Above-mentioned CPU element 1 is the single-chip microcomputer of 89C52 model, and ethernet mac controller 8 is a S3C4510B model processor, and the data forwarding circuit is the dual port RAM chip of IDT7134 model.

Above-mentioned first peripheral circuit 10 comprises RS-232 interface, crystal oscillator, Flash memory circuitry, DRAM interface circuit and sdram interface circuit, and RS-232 interface, crystal oscillator, Flash memory circuitry, DRAM interface circuit and sdram interface circuit all link to each other with ethernet mac controller 8; Above-mentioned second peripheral circuit 11 is a crystal oscillator.

Compared with prior art, the utlity model has following advantage and beneficial effect:

The utility model can be realized the information interaction of device level between fieldbus and the Ethernet; Compare with the information integration pattern that in host computer, realizes; The information integration mode of the utility model is not only easy flexibly,, and have real-time height, advantage with low cost; Overcome the narrower bottleneck of communication bandwidth that the PROFIBUS-DP bus is supported, can satisfy the demand of control system bigger system scale.

Description of drawings

Fig. 1 is the PROFIBUS-DP communication interface circuit sketch map of the utility model;

Fig. 2 is a kind of sketch map of practical implementation of the ethernet interface circuit of the utility model;

Fig. 3 is the sketch map that is connected of PROFIBUS-DP communication interface circuit, ethernet interface circuit and the data forwarding circuit of the utility model;

Among the figure: CPU element 1, reset circuit 2, decoding circuit 3, establish the outer random asccess memory 6 of site circuit 4, address latch 5, sheet and DP communication unit 7, ethernet mac controller 8, ethernet physical layer interface circuit 9, first peripheral circuit 10, second peripheral circuit 11.

Embodiment

Below in conjunction with accompanying drawing and practical implementation the utility model is described further.

The Ethernet that the utility model proposes is to the master-slave mode protocol conversion gateway of PROFIBUS-DP; Constitute by PROFIBUS-DP communication interface circuit, ethernet interface circuit and data forwarding circuit; PROFIBUS-DP communication interface circuit, data forwarding circuit, ethernet interface circuit link to each other successively; In addition; The PROFIBUS-DP communication interface circuit also links to each other with the PROFIBUS-DP bus, and ethernet interface circuit also links to each other with Ethernet, and the data forwarding circuit adopts the dual port RAM chip of IDT7134 model in this practical implementation.

The PROFIBUS-DP communication interface circuit is responsible for receiving and dispatching and handling the data from PROFIBUS-DP main website and data forwarding circuit.Shown in Figure 1 is PROFIBUS-DP communication interface circuit sketch map; Like figure; The PROFIBUS-DP communication interface circuit by CPU element 1, reset circuit 2, decoding circuit 3, establish the outer random asccess memory 6 of site circuit 4, address latch 5, sheet and DP communication unit 7 is formed; Reset circuit 2 links to each other with CPU element 1, and CPU element 1, address latch 5, the outer random asccess memory 6 of sheet, DP communication unit 7 link to each other an end link address bus of decoding circuit 3 respectively with address bus, data/address bus; The other end connects establishes site circuit 4, establishes site circuit 4 and also links to each other with data/address bus.DP communication unit 7 is connected to form by driver, optocoupler, protocol chip in order, and DP communication unit 7 is connected into the PROFIBUS-DP fieldbus through driver, is connected with address bus, data/address bus through protocol chip.In this practical implementation, CPU element 1 adopts the single-chip microcomputer of 89C52 model, and the driver in the DP communication unit 7 adopts the RS-485 driver, and protocol chip adopts the interface chip of SPC3 model.

Ethernet interface circuit is responsible for receiving and dispatching and handling the data from ethernet device and data forwarding circuit.Shown in Figure 2 is the ethernet interface circuit sketch map; Like figure; Ethernet interface circuit is made up of ethernet mac controller 8, ethernet physical layer interface circuit 9, first peripheral circuit 10, second peripheral circuit 11; Ethernet physical layer interface circuit 9, first peripheral circuit 10 all link to each other with ethernet mac controller 8, and second peripheral circuit 11 links to each other with ethernet physical layer interface circuit (9), and ethernet interface circuit is linked Ethernet through ethernet physical layer interface circuit 9.In this practical implementation, ethernet mac controller 8 adopts the flush bonding processor (ARM7 kernel) of S3C4510B model; The core of ethernet physical layer interface circuit 9 is the RTL8201 chip; First peripheral circuit 10 comprises RS-232 interface, 10MHz crystal oscillator, Flash memory circuitry, DRAM interface circuit and sdram interface circuit, and RS-232 interface, crystal oscillator, Flash memory circuitry, DRAM interface circuit and sdram interface circuit all link to each other with ethernet mac controller 8; Second peripheral circuit 11 is the 25MHz crystal oscillator.

The data forwarding circuit is responsible for the PROFIBUS-DP main website data that receive are sent to the application layer of ethernet communication stack, and the data from ethernet device that perhaps will receive send to the PROFIBUS-DP user interface.Shown in Figure 3 is the sketch map that is connected of PROFIBUS-DP communication interface circuit, ethernet interface circuit and data forwarding circuit; Like figure; The PROFIBUS-DP communication interface circuit links to each other with the data forwarding circuit through CPU element 1, and ethernet interface circuit links to each other with the data forwarding circuit through ethernet mac controller 8.

The course of work of the utility model is following:

Access request is sent with PROFIBUS-DP fieldbus data frame form in the request message of PROFIBUS-DP field bus device and device address; The user calls the data transport service of PROFIBUS-DP fieldbus; Request message and device address are sent to DP communication unit 7 with the form of message; DP communication unit 7 is transmitted to CPU element 1 through data/address bus with this message after receiving this message; Message after will unpacking after 1 pair of message that receives of CPU element unpacks is sent to the data forwarding circuit, and the data forwarding circuit sends to ethernet mac controller 8 after message is handled, and nets very much mac controller 8 and adds heading and the verification frame that meets IEEE 802.3 standards in the front and back of message respectively; Form with ethernet frame is delivered to ethernet physical layer interface circuit 9, sends to ethernet device then.

Because Ethernet adopts the structure of sharing formula; Therefore all ethernet devices all will receive the request message from the PROFIBUS-DP field bus device; But only meet this request message of ethernet device response of the destination address in the request message, response data will send to the PROFIBUS-DP field bus device by the backward of above order.

Claims

1. Ethernet is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP, comprising:

The PROFIBUS-DP communication interface circuit comprises CPU element (1), reset circuit (2), decoding circuit (3), establishes site circuit (4), address latch (5), the outer random asccess memory (6) of sheet and DP communication unit (7); Reset circuit (2) links to each other with CPU element (1); CPU element (1), address latch (5), the outer random asccess memory (6) of sheet, DP communication unit (7) link to each other with address bus, data/address bus respectively; One end link address bus of decoding circuit (3); The other end connects establishes site circuit (4), establishes site circuit (4) and also links to each other with data/address bus;

Ethernet interface circuit comprises ethernet mac controller (8), ethernet physical layer interface circuit (9), first peripheral circuit (10), second peripheral circuit (11); Ethernet physical layer interface circuit (9), first peripheral circuit (10) all link to each other with ethernet mac controller (8), and second peripheral circuit (11) links to each other with ethernet physical layer interface circuit (9);

The PROFIBUS-DP communication interface circuit links to each other with the data forwarding circuit through CPU element (1), and ethernet interface circuit links to each other with the data forwarding circuit through ethernet mac controller (8).

2. Ethernet according to claim 1 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

Described DP communication unit (7) is connected to form by driver, optocoupler, protocol chip in order, and DP communication unit (7) is connected with address bus, data/address bus through protocol chip.

3. Ethernet according to claim 2 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

Described driver is the RS-485 driver, and described protocol chip is a SPC3 model interface chip.

4. Ethernet according to claim 1 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

Described CPU element is a 89C52 model single-chip microcomputer.

5. Ethernet according to claim 1 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP: described ethernet mac controller (8) is a S3C4510B model processor.

6. Ethernet according to claim 1 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

The dual port RAM chip that described data forwarding circuit is the IDT7134 model.

7. Ethernet according to claim 1 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

Described first peripheral circuit (10) comprises RS-232 interface, crystal oscillator, Flash memory circuitry, DRAM interface circuit and sdram interface circuit, and RS-232 interface, crystal oscillator, Flash memory circuitry, DRAM interface circuit and sdram interface circuit all link to each other with ethernet mac controller (8).

8. Ethernet according to claim 1 is characterized in that to the master-slave mode protocol conversion gateway of PROFIBUS-DP:

Described second peripheral circuit (11) is a crystal oscillator.