CN101729453A - EPA bus and MODBUS bus conversion adapter - Google Patents
EPA bus and MODBUS bus conversion adapter Download PDFInfo
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- CN101729453A CN101729453A CN200910228191A CN200910228191A CN101729453A CN 101729453 A CN101729453 A CN 101729453A CN 200910228191 A CN200910228191 A CN 200910228191A CN 200910228191 A CN200910228191 A CN 200910228191A CN 101729453 A CN101729453 A CN 101729453A
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Abstract
The invention relates to an EPA bus and MODBUS bus conversion adapter. A main circuit module mainly comprises an ARM controller chip AT91SAM7*256, a network chip RTL8201, a network transformer HR611661, a standard JTAG circuit and a peripheral circuit. The main circuit module acquires a 24V power source for buses through the network; the EPA bus and MODBUS bus conversion adapter analyzes and converts MODBUS protocol messages into EPA protocol messages; and the EPA messages are directly connected to an industrial switch through a network interface RJ45 on the main circuit module of the conversion adapter by the Ethernet to finally realize the purpose of converting the MODBUS into the EPA. After MODBUS equipment and an MODBUS/EPA conversion module are connected, the purpose of converting the MODBUS messages into the EPA messages can be realized, the MODBUS equipment can be successfully monitored and configured in EPA configuration software, and the MODBUS equipment and the EPA equipment can coexist in the same network and can be operated and accessed mutually.
Description
Technical field
The present invention relates to the module of mutual conversion between a kind of industrial process control instrument different bus, particularly a kind of EPA bus and MODBUS bus conversion adapter.
Background technology
The field bus technique that produce and grow up the eighties in 20 century, improved antijamming capability greatly because having realized digital communication, exist multiple bus standard in the industrial automation field at present, what be accompanied by the field bus technique birth is that each golden eggs group is in order to grab the standard battle of market economy interests.Simultaneously, also there are other deficiencies of self in field bus technique: can not be compatible between the different bus, can not realize really that seamless integrated, the agreement and the realization technical sophistication of information are exchanged visits, can't be realized to transparent information, transmission rate is low, cost is high, be difficult for realizing the seamless link with the upper layer information network.
Meanwhile Industrial Ethernet becomes new developing direction, Ethernet has following characteristics: be widely used, with low cost, communication speed is high, software and hardware resources is abundant, the sustainable development potentiality are big, be easy to be connected with Internet, the information of realization office automation network and industrial control network is seamless integrated.The EPA bus standard is exactly a kind of Industrial Ethernet technology that has wide application prospect at present and have China's independent intellectual property right, and this makes other buses and the mutual communication of EPA bus become the focus of present research.
Summary of the invention
The technical problem to be solved in the present invention is: design a kind of brand-new bus conversion adaptation module, convert present widely used MODBUS bus signals to the EPA bus signals, realize interconnecting of MODBUS network and EPA network.
The present invention realizes by such technical scheme: EPA bus and MODBUS bus conversion adapter comprise the main circuit module, described main circuit module is mainly by ARM controller chip AT91SAM7x256, network chip RTL8201, network transformer HR611661, the jtag circuit of standard and peripheral circuit constitute, it is characterized in that: described main circuit module obtains bus 24V power supply by network, 24V power supply with acquisition is that power module WRB2405 provides input voltage, be converted to the 5V output voltage by power module WRB2405 then, be converted to 3.3V output through power module LM1117-3.3 again; With 3.3V voltage is the operating voltage of main circuit module; To send ARM controller chip AT91SAM7x256 to from the signal of MODBUS equipment by RS485 chip ADM2486; The standard jtag circuit connects ARM chip AT91SAM7x256; Network chip RTL8201 is connected with ARM controller chip AT91SAM7x256 by the MAC interface, realizes communication by the EMAC interface; Network transformer HR611661 is connected with network chip RTL8201, RJ45 network interface respectively; Adopt bus-poweredly, link to each other, directly connect industrial switch with MODBUS equipment, realize networkings with other EPA equipment in this network segment by Ethernet interface by the MODBUS joint.
The main circuit module of EPA bus and MODBUS bus conversion adapter adopts bus-powered, link to each other, directly connect industrial switch with MODBUS equipment by the MODBUS joint by Ethernet interface, realize networking with other EPA equipment in this network segment, realize the seamless link of EPA network and MODBUS fieldbus networks.
Equipment with MODBUS bus functionality links to each other with MODBUS special purpose interface on the MODBUS bus conversion adapter by the EPA bus, and the MODBUS signal is sent on EPA bus and the MODBUS bus conversion adapter.
EPA bus and MODBUS bus conversion adapter are through the analysis to the MODBUS protocol massages, be converted into the EPA protocol massages, and by the network interface RJ45 on the conversion adapter main circuit module, the EPA message is connected directly on the industrial switch by Ethernet, finally realizes the conversion of MODBUS to EPA.
The power supply of main circuit module adopts bus-powered mode to be, is provided+24V by RJ45 interface 4,5 pin of industrial switch, and 7,8 pin provide GND, provide power supply by netting twine for the main circuit module.
The main chip that the main circuit module adopts is the AT91SAM7x256 of the ARM7 series of Atmel company, its built-in ethernet controller and MAC layer, network chip adopts RTL8201, and it has the network PHY layer, cooperates with AT91SAM7x256 to form the whole network development module.Adopt embedded OS uC/OS-II mainly to comprise EPA ethernet communication module on the software, the MODBUS module, the ARM microprocessor is carried out software modules such as EPA protocol stack, MODBUS main website protocol stack and EPA/MODBUS protocol conversion module, and EPA agreement and MODBUS agreement realize the conversion interconnection by EPA protocol stack, MODBUS main website protocol stack and EPA/MODBUS protocol conversion module.
The invention has the beneficial effects as follows: with MODBUS equipment with can realize of the conversion of MODBUS message after MODBUS/EPA modular converter (EPA bus and MODBUS bus conversion adapter) links to each other to the EPA message, this MODBUS equipment of monitoring that can be successful in the EPA configuration software and configuration, realize MODBUS equipment and EPA coexistence in consolidated network, and realize that interoperability, exchanging visit between them ask.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present invention, and as Figure of abstract;
Fig. 2 is ARM controller chip of the present invention and peripheral circuit thereof;
Fig. 3 is network chip of the present invention and peripheral circuit thereof;
Fig. 4 is a software flow pattern of the present invention.
Embodiment
For a more clear understanding of the present invention, describe the present invention in detail with example in conjunction with the accompanying drawings:
Shown in Fig. 1-4, the equipment with MODBUS bus functionality links to each other with MODBUS special purpose interface on the MODBUS bus conversion adapter main circuit module by the EPA bus, and the MODBUS signal is sent on EPA bus and the MODBUS bus conversion adapter.EPA bus and MODBUS bus conversion adapter are through the analysis to the MODBUS protocol massages, be converted into the EPA protocol massages, and by the network interface RJ45 on the main circuit module, the EPA message is connected directly on the industrial switch by Ethernet, finally realizes the conversion of MODBUS to EPA.The power supply of integrated circuit board is adopted bus-powered, is provided+24V by RJ45 interface 4,5 pin of industrial switch, and 7,8 pin provide GND, provide power supply by netting twine for integrated circuit board.The main chip that integrated circuit board adopts is the AT91SAM7x256 of the ARM7 series of Atmel company, its built-in ethernet controller and MAC layer, and network chip adopts RTL8201, and it has the network PHY layer, cooperates with AT91SAM7x256 to form the whole network development module.Adopt embedded OS uC/OS-II mainly to comprise EPA ethernet communication module on the software, the MODBUS module, the ARM microprocessor is carried out software modules such as EPA protocol stack, MODBUS main website protocol stack and EPA/MODBUS protocol conversion module, and EPA agreement and MODBUS agreement are changed interconnection mutually by EPA protocol stack, MODBUS main website protocol stack and EPA/MODBUS protocol conversion module.
As shown in Figure 2, this is the CPU part of whole main circuit module, adopts AT91SAM7x256, and this is the ARM chip of a MAC of being integrated with layer and network controller.The operating voltage of entire chip is 3.3V, and the operating voltage of ARM kernel is 1.8V, and 1.8V voltage is given the kernel power supply of self by the VDDOUT output of this chip, and all the other IO parts and peripheral controls are 3.3V power supplies.Owing to adopting bus 24V power supply, so need two power modules, be respectively WRB2405 and LM1117-3.3, the former is used for 24V changes 5V, and the latter is used for 5V commentaries on classics 3.3V and powers to CPU then.The crystal oscillator of CPU adopts 18.432MHz, through producing the frequency of 48MHz as the ARM dominant frequency after the PLL controller frequency division frequency multiplication.Artificial debugging partly adopts the jtag circuit of standard.CPU realizes that with being connected by the EMAC interface of network chip RTL8201 the interface number of EMAC is altogether 15 pins.ADM2486 is the RS485 chip, and its A, B correspondence the signal of MODBUS joint.
As shown in Figure 3, this is the network portion of main circuit module, and wherein RTL8201 is the network chip of integrated PHY layer, and its external crystal oscillator is 25MHz, and it is connected with AT91SAM7x256 by the MAC interface.HR611661 is a network transformer, and it is connected with RTL8201 with the RJ45 network interface respectively.4,5 pin of the network interface of RJ45 obtain the 24V power supply by industrial switch, and 7,8 pin also link to each other with industrial switch and obtain GND, realize bus-powered.
Software flow as shown in Figure 4, the whole software system transplantation has embedded OS uC/OS-II and built-in network ICP/IP protocol, and adds the EPA layer on this basis, realizes the agreement of EPA, and adds the code of MODBUS protocol conversion in application layer.
Adopt embedded OS uC/OS-II mainly to comprise EPA ethernet communication module on the software, the MODBUS module, the ARM microprocessor is carried out software modules such as EPA protocol stack, MODBUS main website protocol stack and EPA/MODBUS protocol conversion module, and EPA agreement and MODBUS agreement realize the conversion interconnection by EPA protocol stack, MODBUS main website protocol stack and EPA/MODBUS protocol conversion module.
According to the above description, can realize the solution of the present invention in conjunction with art technology.
Claims (2)
1.EPA bus and MODBUS bus conversion adapter, comprise the main circuit module, described main circuit module mainly is made of the jtag circuit and the peripheral circuit of ARM controller chip AT91SAM7x256, network chip RTL8201, network transformer HR611661, standard, it is characterized in that: described main circuit module obtains bus 24V power supply by network, 24V power supply with acquisition is that power module WRB2405 provides input voltage, be converted to the 5V output voltage by power module WRB2405 then, be converted to 3.3V output through power module LM1117-3.3 again; With 3.3V voltage is the operating voltage of main circuit module; Will be by RS485 chip ADM2486 from the signal of MODBUS bus apparatus; Send ARM controller chip AT91SAM7x256 to; The standard jtag circuit is by connecting ARM chip AT91SAM7x256; Network chip RTL8201 is connected with ARM controller chip AT91SAM7x256 by the MAC interface, realizes communication by the EMAC interface; Network transformer HR611661 is connected with network chip RTL8201, RJ45 network interface respectively.
2. EPA bus and MODBUS bus conversion adapter according to claim 1, it is characterized in that: described main circuit modular power source is to obtain+the 24V power supply by RJ45 interface 4,5 pin of RJ45 netting twine from industrial switch, obtains GND from 7,8 pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009102281916A CN101729453B (en) | 2009-11-12 | 2009-11-12 | EPA bus and MODBUS bus conversion adapter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102281916A CN101729453B (en) | 2009-11-12 | 2009-11-12 | EPA bus and MODBUS bus conversion adapter |
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| CN101729453A true CN101729453A (en) | 2010-06-09 |
| CN101729453B CN101729453B (en) | 2011-12-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162670A (en) * | 2011-05-06 | 2011-08-24 | 山东大学 | Split networked intelligent temperature controller of central air conditioner |
| CN102681967A (en) * | 2012-05-16 | 2012-09-19 | 浙江中控研究院有限公司 | Data transmission device between EPA (Ethernet for plant automation) and PCI (peripheral component interconnect) buses |
| CN108881004A (en) * | 2018-08-29 | 2018-11-23 | 无锡小湖科技有限公司 | A kind of Industrial Ethernet IP address conversion gateway |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5896508A (en) * | 1995-02-23 | 1999-04-20 | Advanced Micro Devices, Inc. | Hub-network adapter device for a file server personal computer |
| CN100452107C (en) * | 2007-08-01 | 2009-01-14 | 太原理工大学 | AT91M40800 based multi-tandem port bus system |
| CN101442460A (en) * | 2008-12-26 | 2009-05-27 | 厦门大学 | Industry Ethernet adapter |
-
2009
- 2009-11-12 CN CN2009102281916A patent/CN101729453B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162670A (en) * | 2011-05-06 | 2011-08-24 | 山东大学 | Split networked intelligent temperature controller of central air conditioner |
| CN102681967A (en) * | 2012-05-16 | 2012-09-19 | 浙江中控研究院有限公司 | Data transmission device between EPA (Ethernet for plant automation) and PCI (peripheral component interconnect) buses |
| CN102681967B (en) * | 2012-05-16 | 2016-01-06 | 浙江中控研究院有限公司 | Data transmission device between EPA and pci bus |
| CN108881004A (en) * | 2018-08-29 | 2018-11-23 | 无锡小湖科技有限公司 | A kind of Industrial Ethernet IP address conversion gateway |
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| Publication number | Publication date |
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| CN101729453B (en) | 2011-12-07 |
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Assignee: Central sky instrument (Tianjin) weather instrument Co., Ltd. Assignor: Zhonghuan TIG Co., Ltd. Contract record no.: 2011120000293 Denomination of invention: EPA bus and MODBUS bus conversion adapter Granted publication date: 20111207 License type: Exclusive License Open date: 20100609 Record date: 20111227 |