CN102088444A - PROFIBUS DP and PROFIBUS PA protocol conversion gateway module - Google Patents
PROFIBUS DP and PROFIBUS PA protocol conversion gateway module Download PDFInfo
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Abstract
The invention provides a PROFIBUS DP and PROFIBUS PA protocol conversion gateway module comprising an isolation power source, a PROFIBUS DP isolation interface, a communication control unit, a profibus communication controller and a PROFIBUS PA isolation interface, wherein the PROFIBUS PA isolation interface is used for realizing the transceiving of PROFIBUS DP physical layer signals; and the communication control unit is used for sending a DP message to the profibus communication controller and sending a PA message of the profibus communication controller to a DP bus. The profibus communication controller is used for decoding the PA message sent by the PROFIBUS PA isolation interface so as to send to the communication control unit and encoding the DP message sent by the communication control unit to generate a PA message encoded in a Manchester format to send to the PROFIBUS PA isolation interface. The module provided by the invention has the advantages of simple hardware structure and low cost.
Description
Technical field
The present invention relates to the field bus technique field, particularly a kind of PROFIBUS DP and PROFIBUS PA protocol conversion gateway module.
Background technology
PROFIBUS is a kind of field bus technique that is used for the monitoring of factory automation workshop level and scene equipment level data communication and control.The PROFIBUS protocol architecture is according to the ISO7498 international standard, and with reference to model, this model has seven layers with open system internet (OSI, Open System Interconnection) conduct.Ground floor is a physical layer, and the second layer is a data link layer, and use at the three-six layer of end, and layer 7 is an application layer.PROFIBUS is made up of three compatible parts, i.e. PROFIBUS-DP, PROFIBUS-PA and PROFIBUS-FMS.
(1) PROFIBUS-DP: defined first and second layer and user interface.The the 3rd to seven layer does not add description.User interface has been stipulated the application function that user and system and distinct device can call, and describes the equipment behavior of various different PROFIBUS-DP equipment in detail.
(2) PROFIBUS-FMS: defined first and second, seven layers, application layer comprises fieldbus information standard (FMS, Fieldbus Message Specification) and LLI (LLI, Lower LayerInterface).FMS has comprised application protocol and but the strong communication service of wide selection is provided to the user.LLI coordinates different correspondences and the second layer access interface of the equipment of not relying on is provided.
(3) transfer of data of PROFIBUS-PA:PA adopts the PROFIBUS-DP agreement of expansion.In addition, PA has also described the PA professional etiquette of field apparatus behavior.According to the IEC61158-2 standard, the transmission technology of PA can be guaranteed its intrinsic safety, and can power to field apparatus by bus.Use connector can on DP, expand the PA network.
At present, the product of protocol conversion is DP LINK between the PROFIBUS DP of Siemens Company and PROFIBUS PA, and this kind equipment as slave station, as main website, communicates management to the PA instrument in the PA network in the DP network.Can be with the communication speed that is up to 12Mbps in the DP network, communication efficiency is higher.But the communication speed of realizing 12Mbps needs very complicated hardware circuit structure and complicated software control procedure, otherwise can't realize so high communication speed.And the raising of hardware circuit and control program complexity can bring cost to rise and guarantee that the difficulty of module functional reliability rises.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of PROFIBUS DP and PROFIBUS PA protocol conversion gateway module, and is simple in structure and cost is low.
The embodiment of the invention provides a kind of PROFIBUS DP and PROFIBUS PA protocol conversion gateway module, comprising: insulating power supply, PROFIBUS DP isolating interface, communication control unit, field bus communication controller and PROFIBUS PA isolating interface;
Described PROFIBUS DP isolating interface is connected between described PROFIBUS DP bus and the described communication control unit, is used to realize the transmitting-receiving of PROFIBUS DP bus physical layer signal;
Described communication control unit is used for the transmitting-receiving of high-speed asynchronous serial mode realization with the DP message of PROFIBUS DP isolating interface; Be used for again with parallel mode visit field bus communication controller;
Described field bus communication controller is connected between described communication control unit and the described PROFIBUS PA isolating interface, is used for the PA message that the transmission of described PROFIBUS PA isolating interface comes is decoded, and is passed to described communication control unit; Be used for again the DP message that described communication control unit transmission comes is encoded, generate the PA message of the coding of Manchester form, be sent to described PROFIBUS PA isolating interface;
Described PROFIBUS PA isolating interface is used to realize the transmitting-receiving of PROFIBUS PA bus physical layer signal.
Preferably, described communication control unit is used for that also the DP message that the transmission of described PROFIBUS DP isolating interface comes is carried out validity and judges, when described DP message is when sending to the message of PROFIBUS PA bus, the DP message to be sent to described field bus communication controller.
Preferably, described communication control unit comprises high-speed asynchronous serial line interface and microprocessor;
Described high-speed asynchronous serial line interface connects PROFIBUS DP isolating interface, is used to receive and send the DP message that the asynchronous serial mode is transmitted;
Described high-speed asynchronous serial line interface connects the serial peripheral equipment interface SPI on the described microprocessor, is used to realize the high-speed transfer of DP message.
Preferably, described high-speed asynchronous serial line interface and described microprocessor adopt the clock work of different frequency.
Preferably, the switch operating frequency of described insulating power supply is greater than 300KHz; Described insulating power supply output 5V, 3.3V and 1.8V three road voltages, the isolation voltage of three road voltages is not less than direct current 1000V.
Preferably, described insulating power supply provides 5V voltage for described PROFIBUS DP isolating interface and described PROFIBUSPA isolating interface, for described communication control unit provides 3.3V voltage, for the CPU core of described communication control unit provides 1.8V voltage.
Preferably, described PROFIBUS DP isolating interface employing operating rate is the following RS485 interface chip for driving of 2.5Mbit/s.
Preferably, it is the above interface chip of 2.5Mbit/s that described high-speed asynchronous serial line interface adopts communication speed, carries out communication by serial peripheral equipment interface SPI and microprocessor.
Preferably, also comprise three light-emitting diodes that are connected with described communication control unit, be respectively applied for that the described insulating power supply work of indication is whether normal, the DP communication is whether normal and whether the PA communication is normal.
Preferably, also comprise watchdog circuit, be used to monitor whether the work of described communication control unit is normal,, described communication control unit is resetted when monitoring when unusual.
Compared with prior art, the present invention has the following advantages:
PROFIBUS DP provided by the invention and PROFIBUS PA protocol conversion gateway module have adopted PROFIBUS DP isolating interface, communication control unit, field bus communication controller and PROFIBUSPA isolating interface can realize the mutual of DP message and PA message, and each part can adopt an integrated chip to finish its function.Because communication control unit not only can have been realized receiving and dispatching the DP message but also can visiting the field bus communication controller with parallel mode in the asynchronous serial mode; Finished conversion between DP message and the PA message with minimum hardware configuration like this, so hardware configuration is simple, system cost is low.
Description of drawings
Fig. 1 is PROFIBUS DP of the present invention and PROFIBUS PA protocol conversion gateway module embodiment one schematic diagram;
Fig. 2 is PROFIBUS DP of the present invention and PROFIBUS PA protocol conversion gateway module embodiment two schematic diagrames;
Fig. 3 is PROFIBUS DP of the present invention and PROFIBUS PA protocol conversion gateway module embodiment three schematic diagrames.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is PROFIBUS DP of the present invention and PROFIBUS PA protocol conversion gateway module embodiment one schematic diagram.
PROFIBUS DP that present embodiment provides and PROFIBUS PA protocol conversion gateway module comprise: insulating power supply 101, PROFIBUS DP isolating interface 102, communication control unit 103, field bus communication controller 104 and PROFIBUS PA isolating interface 105.
Described PROFIBUS DP isolating interface 102 is connected between described PROFIBUS DP bus and the described communication control unit 103, is used to realize the transmitting-receiving of PROFIBUS DP bus physical layer signal.
Described PROFIBUS DP isolating interface 102 specifically can be realized by the RS485 interface, is used for PROFIBUS DP main website equipment is converted to by the DP message of encoding with the asynchronous serial of differential signal transmission on the DP bus signal of CMOS level.
Described communication control unit 103 is used for realizing transmitting-receiving with the DP message of PROFIBUS DP isolating interface 102 in the asynchronous serial mode; Be used for again visiting field bus communication controller 104 in the parallel bus mode; Described communication control unit 103 carries program storage and data storage; Described field bus communication controller 104 carries data storage.
The function of communication control unit 103 is mainly finished DP message and PA message forwarding, the DP message that receives should be sent to the PA bus side, again the PA message is sent to the DP bus side.
Because communication control unit 103 is inconsistent with the mode of PROFIBUS DP isolating interface 102 and the communication of field bus communication controller, therefore need communication control unit can realize that high-speed asynchronous serial communication can realize concurrent access field bus communication controller again.
Described field bus communication controller 104 is connected between described communication control unit 103 and the described PROFIBUS PA isolating interface 105, be used for that described PROFIBUS PA isolating interface 105 is transmitted the PA message that comes and decode, be sent to described communication control unit 103; Be used for that again described communication control unit 103 is transmitted the DP message that comes and encode, generate the coding of Manchester form, be sent to described PROFIBUS PA isolating interface 105.
Because the DP message is different with the form of PA message, therefore need the field bus communication controller to carry out the conversion that Code And Decode is finished DP message and PA message.
The PA message is the coding that adopts Manchester form, therefore when communication control unit 103 sends to field bus communication controller 104 with the DP message, field bus communication controller 104 is encoded the DP message, generate the PA message of Manchester form, send to PROFIBUS PA isolating interface 105.PROFIBUS PA isolating interface 105 messages with Manchester form are converted to the signal of PA bus physical layer and deliver on the PA bus.
When field bus communication controller 104 receives PA message from the PA bus by PROFIBUS PA isolating interface 105, the PA message is decoded, the message after the decoding conversion is sent to communication control unit 103.
The field bus communication controller 104 preferred FBC0409 field bus communication controller chips that adopt that present embodiment provides.
FBC0409 follows the physical layer specification of IEC 61158-2 standard, and can cooperate with ARM series CPU very easily, is configured to the master and slave equipment of PA bus.Built-in chip type has the field bus communication controller, as long as externally can constitute PROFIBUS-PA field bus system interface with simple PROFIBUS-PA interface.
FBC0409 design has transmit frame and received frame verification, 16 1ms timers, 16 1/32ms timers, 16 bit byte timers, the decoding of frame sign indicating number and Address Recognition etc.When preventing that time that the PA interface is in transmit status from having surpassed the maximum time of stipulating in the agreement, stop automatically sending, realized becoming to send the function of " chatting " control.This function can be avoided making the danger of whole network paralysis owing to certain equipment on the bus breaks down to a certain extent.
In order to improve network throughput, alleviate the processing burden of CPU, simultaneously also for ease of software programming, chip internal is integrated direct memory visit (DMA, Direct Memory Access) controller is respectively applied for the transmitting-receiving of fieldbus PA message data and the matching addresses in the data link layer.Chip internal is integrated with the Asynchronous SRAM of 4K byte, is used for the message data and the address table data of transmitting-receiving are stored.
Described PROFIBUS PA isolating interface 105 is used to realize the transmitting-receiving of PROFIBUS PA bus physical layer signal.
Described PROFIBUS PA isolating interface 105 can adopt the high-frequency signal transmission transformer to realize the transmission and the reception of PA bus message, has realized the Signal Spacing of PA bus simultaneously, satisfies the requirement of the physical layer specification of IEC 61158-2 standard.
PROFIBUS DP provided by the invention and PROFIBUS PA protocol conversion gateway module have adopted PROFIBUS DP isolating interface 102, communication control unit 103, field bus communication controller 104 and PROFIBUS PA isolating interface 105 can realize the mutual forwarding of DP message and PA message, and each part can adopt an integrated chip to finish its function.Communication control unit 103 the highest communication speed and the DP bus communications that can realize 3M that present embodiment provides.Because communication control unit 103 not only can have been realized receiving and dispatching the DP message but also can visiting field bus communication controller 104 in the mode of running simultaneously in the asynchronous serial mode.And communication control unit 103 self-contained storing devices and field bus communication controller 104 carry RAM, finished conversion between DP message and the PA message with minimum hardware configuration like this, so hardware configuration are simple, and system cost is low.
Referring to Fig. 2, this figure is PROFIBUS DP of the present invention and PROFIBUS PA protocol conversion gateway module embodiment two schematic diagrames.
Need to prove that described communication control unit can be realized separately by a chip, requires this chip to have high-speed asynchronous serial line interface, with the communication of realization with PROFIBUS DP isolating interface.Certainly, described communication control unit also can be realized by two chips, a high-speed asynchronous serial interface chip, a microprocessor.Described high-speed asynchronous serial line interface can adopt different clock frequency work respectively with described microprocessor device, and the clock frequency of described high-speed asynchronous serial line interface can be higher than the clock frequency of described microprocessor.
Being embodied as example with communication control unit by two independent chips in the present embodiment is introduced.
PROFIBUS DP isolating interface realizes isolating conversion with level by RS485 interface 202 in the present embodiment.RS485 interface 202 adopts and can be operated in the following RS485 interface driver chip of 2.5Mbit/s speed, can preferably adopt SN65ALS176D, certainly, can adopt the chip that has the identical function index with SN65ALS176D.
The RS485 interface cooperates 3 passage high speed magnetic electricity isolating devices, powers to SN65ALS176D and magnetoelectricity isolating device by the DC/DC that isolates, and realizes 1000VDC electrical isolation voltage indexes.The magnetoelectricity isolating device is the ADUM1301B of ADI company or the device with identical function index preferably.
High-speed asynchronous serial line interface 203 is used for realizing receiving and dispatching the message with the asynchronous system transmission on the PROFIBUS DP bus.
The 203 preferred employings of present embodiment high speed Asynchronous Serial Interface can be operated in the above interface chip of 2.5Mbps speed, for example can adopt the XR20M1170 of EXAR company.
The main performance index of XR20M1170 is: single channel, 3.3V, 16Mbps, 64 byte push-up storages (FIFO, First In First Out), 5Mbps Serial Peripheral Interface (SPI, SerialPeripheral Interface).This chip need carry out communication by the SPI interface with microprocessor 204 by independent crystal oscillator as clock circuit work.Because the FIFO of this chip internal with 64 bytes, the effective DP message that receives of buffer memory, the normal transmitting-receiving of the DP message of realization 45.45Kbit/s, 93.75Kbit/s, 187.5Kbit/s, 500Kbit/s, 750Kbit/s and 1500Kbit/s speed.
The high performance ARM7 single-chip microcomputer of microprocessor 204 preferred employings also can adopt the open microprocessor LPC2214 of 32 buses of NXP company in the present embodiment.
Need to prove that in order to guarantee not lose DP message and PA message, microprocessor internal can adopt higher clock frequency work.By register and the PA message memory buffer of Single Chip Microcomputer (SCM) system expansion bus with parallel mode visit field bus communication controller 205 inside.
Identical among field bus communication controller 205 and the embodiment one do not repeat them here.
Identical among PROFIBUS PA isolating interface 206 and the embodiment one do not repeat them here.
The switch operating frequency of described insulating power supply 201 is exported 5V, 3.3V and 1.8V three road voltages greater than 300KHz, and the isolation voltage of three road voltages is not less than direct current 1000V.
Described insulating power supply 201 provides 5V voltage for described PROFIBUS DP isolating interface 202 and described PROFIBUSPA isolating interface 206, for described high-speed asynchronous serial line interface 203 and microprocessor 204 provide 3.3V voltage, for the CPU core of described microprocessor 204 provides 1.8V voltage.
The gateway module that present embodiment provides also comprises three light-emitting diodes 207 that are connected with described communication control unit, is respectively applied for that the described insulating power supply work of indication is whether normal, the DP communication is whether normal and whether the PA communication is normal.
For example, when light-emitting diode was redness, the expression operation irregularity during for green, was represented working properly.
Also comprise watchdog circuit 208, be used for monitoring whether the work of microprocessor 204 of described communication control unit is normal,, described communication control unit is resetted when monitoring when unusual.
Referring to Fig. 3, this figure is PROFIBUS DP of the present invention and PROFIBUS PA protocol conversion gateway module embodiment three schematic diagrames.
The difference of gateway module that present embodiment provides and embodiment two is to have increased: combined testing action group (JTAG, Joint Test Action Group) interface 301 and memory EEPROM302, the Flash303 and the RAM304 that extend out.
Described jtag interface 301 is that Communication Control microprocessor internal circuit is carried out boundary scan and malfunction monitoring, Communication Control microprocessor 204 carries described jtag interface, can come the test chip internal state by this interface, at this moment need be by described jtag interface under computer software is supported, to chip measure, program is downloaded and debugging.
When the gateway module that present embodiment provides is worked, with the DP message of PROFIBUS-DP main website equipment, convert the CMOS level signal to by encoding with the asynchronous serial of differential signal transmission on the DP bus by PROFIBUS DP isolating interface.After high-speed asynchronous serial ports receives, deliver in the microprocessor by the SPI synchronous serial interface of high-speed asynchronous serial port chip again.After microprocessor carries out validity identification to message, deliver in the field bus communication controller, form the PA message of Manchester form coding, convert the level that meets the PROFIBUS-PA physical layer protocol to by the PROFIBUS PA isolating interface of isolating at last and deliver on the PA bus, deliver to field instrument through the PA bus.
After field instrument is received these messages, can send corresponding response message, response message is again by the PA bus, PROFIBUS PA isolating interface receives, by after the decoding of field bus communication controller,, convert the DP message of asynchronous serial coding to by high-speed asynchronous serial line interface again via controller, send on the DP bus by the PROFIBUS DP isolating interface of isolating, as the response of the message that the PROFIBUS-DP main website is sent.
The device that the gateway module that the embodiment of the invention provides adopts is less, and hardware configuration is simple, so cost is low, and software control also realizes easily.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. PROFIBUS DP and PROFIBUS PA protocol conversion gateway module is characterized in that, comprising: insulating power supply, PROFIBUS DP isolating interface, communication control unit, field bus communication controller and PROFIBUS PA isolating interface;
Described PROFIBUS DP isolating interface is connected between described PROFIBUS DP bus and the described communication control unit, is used to realize the transmitting-receiving of PROFIBUS DP bus physical layer signal;
Described communication control unit is used for the transmitting-receiving of high-speed asynchronous serial mode realization with the DP message of PROFIBUS DP isolating interface; Be used for again with parallel mode visit field bus communication controller;
Described field bus communication controller is connected between described communication control unit and the described PROFIBUS PA isolating interface, is used for the PA message that the transmission of described PROFIBUS PA isolating interface comes is decoded, and is passed to described communication control unit; Be used for again the DP message that described communication control unit transmission comes is encoded, generate the PA message of the coding of Manchester form, be sent to described PROFIBUS PA isolating interface;
Described PROFIBUS PA isolating interface is used to realize the transmitting-receiving of PROFIBUS PA bus physical layer signal.
2. PROFIBUS DP according to claim 1 and PROFIBUS PA protocol conversion gateway module, it is characterized in that, described communication control unit is used for that also the DP message that the transmission of described PROFIBUS DP isolating interface comes is carried out validity and judges, when described DP message is when sending to the message of PROFIBUS PA bus, the DP message to be sent to described field bus communication controller.
3. PROFIBUS DP according to claim 2 and PROFIBUS PA protocol conversion gateway module is characterized in that described communication control unit comprises high-speed asynchronous serial line interface and microprocessor;
Described high-speed asynchronous serial line interface connects PROFIBUS DP isolating interface, is used to receive and send the DP message that the asynchronous serial mode is transmitted;
Described high-speed asynchronous serial line interface connects the serial peripheral equipment interface SPI on the described microprocessor, is used to realize the high-speed transfer of DP message.
4. PROFIBUS DP according to claim 3 and PROFIBUS PA protocol conversion gateway module is characterized in that, described high-speed asynchronous serial line interface and described microprocessor adopt the clock work of different frequency.
5. PROFIBUS DP according to claim 1 and PROFIBUS PA protocol conversion gateway module is characterized in that the switch operating frequency of described insulating power supply is greater than 300KHz; Described insulating power supply output 5V, 3.3V and 1.8V three road voltages, the isolation voltage of three road voltages is not less than direct current 1000V.
6. PROFIBUS DP according to claim 5 and PROFIBUS PA protocol conversion gateway module, it is characterized in that, described insulating power supply provides 5V voltage for described PROFIBUS DP isolating interface and described PROFIBUS PA isolating interface, for described communication control unit provides 3.3V voltage, for the CPU core of described communication control unit provides 1.8V voltage.
7. PROFIBUS DP according to claim 1 and PROFIBUS PA protocol conversion gateway module is characterized in that, it is the following RS485 interface chip for driving of 2.5Mbit/s that described PROFIBUS DP isolating interface adopts operating rate.
8. PROFIBUS DP according to claim 3 and PROFIBUS PA protocol conversion gateway module, it is characterized in that, it is the above interface chip of 2.5Mbit/s that described high-speed asynchronous serial line interface adopts communication speed, carries out communication by serial peripheral equipment interface SPI and microprocessor.
9. PROFIBUS DP according to claim 1 and PROFIBUS PA protocol conversion gateway module, it is characterized in that, also comprise three light-emitting diodes that are connected with described communication control unit, be respectively applied for that the described insulating power supply work of indication is whether normal, the DP communication is whether normal and whether the PA communication is normal.
10. PROFIBUS DP according to claim 1 and PROFIBUS PA protocol conversion gateway module, it is characterized in that, also comprise watchdog circuit, be used to monitor whether the work of described communication control unit is normal, when monitoring when unusual, described communication control unit is resetted.
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| CN103051506A (en) * | 2012-12-30 | 2013-04-17 | 上海自动化仪表股份有限公司 | ProfiBus (Process Field Bus) DP/PA (Decentialized Periphery/Process Automation) coupler and DP/PA message conversion method thereof |
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| CN105242592A (en) * | 2015-09-11 | 2016-01-13 | 重庆川仪自动化股份有限公司 | Method and system for directly reading HART instrument parameters through PROFIBUS PA operating station |
| CN105242592B (en) * | 2015-09-11 | 2018-11-23 | 重庆川仪自动化股份有限公司 | The method and system of HART meter parameter are directly read by PROFIBUS PA active station |
| CN106878158A (en) * | 2015-12-11 | 2017-06-20 | 重庆川仪自动化股份有限公司 | Fieldbus Based multichannel gateway device and its communication means |
| CN106878131B (en) * | 2017-03-24 | 2020-06-05 | 浙江中控技术股份有限公司 | PROFIBUS coupler and data transmission method of PROFIBUS |
| CN106878131A (en) * | 2017-03-24 | 2017-06-20 | 浙江中控技术股份有限公司 | A kind of data transmission method of PROFIBUS couplers and PROFIBUS |
| CN109194889A (en) * | 2018-08-16 | 2019-01-11 | 长芯盛（武汉）科技有限公司 | Low speed signal conversion module for DP interface |
| CN109194889B (en) * | 2018-08-16 | 2020-11-20 | 长芯盛（武汉）科技有限公司 | Low-speed signal conversion module for DP interface |
| CN112422872A (en) * | 2020-11-16 | 2021-02-26 | 飞昂创新科技南通有限公司 | Circuit compatible with DP and DP + + protocol low-speed signals for line speed forwarding |
| CN112445536A (en) * | 2020-12-10 | 2021-03-05 | 深圳市英威腾电气股份有限公司 | Profibus DP master station communication card, communication method and system |
| CN113452716A (en) * | 2021-06-29 | 2021-09-28 | 西安热工研究院有限公司 | PROFIBUS industrial control protocol safety ferrying method and device |
| CN113890785A (en) * | 2021-11-03 | 2022-01-04 | 西安热工研究院有限公司 | Communication system and method for field bus hybrid networking |
| CN113890785B (en) * | 2021-11-03 | 2022-12-27 | 西安热工研究院有限公司 | Communication system and method for field bus hybrid networking |
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Application publication date: 20110608 |