CN103414625A - Ethernet IO module based on Modbus Tcp - Google Patents
Ethernet IO module based on Modbus Tcp Download PDFInfo
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- CN103414625A CN103414625A CN2013102380763A CN201310238076A CN103414625A CN 103414625 A CN103414625 A CN 103414625A CN 2013102380763 A CN2013102380763 A CN 2013102380763A CN 201310238076 A CN201310238076 A CN 201310238076A CN 103414625 A CN103414625 A CN 103414625A
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Abstract
The invention discloses an Ethernet IO module based on a Modbus Tcp. The Ethernet IO module comprises a DC power supply module, a TVS circuit, an optical coupling isolation circuit, a microprocessor, a watchdog circuit, a ferroelectric memory, a TCP module, an RJ45 serial port, an I2C bus decoder and a power driving module, wherein the DC power supply module is connected to the microprocessor through the TVS circuit and the optical coupling isolation circuit in sequence; the microprocessor is respectively in bidirectional connection with the watchdog circuit, the ferroelectric memory and the TCP module; the TCP module is further in bidirectional connection with the RJ45 serial port; and the microprocessor is connected with the power driving module through I2C bus decoder. When the equipment crashes, the equipment can maintain the output port status before the crash of the equipment by utilizing the I2C bus technology, and the port equipment status during the restart period of the equipment cannot be changed, thereby causing no impact on the application of user equipment.
Description
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Technical field
The present invention relates to a kind of IO of Ethernet based on Modbus Tcp module.
Background technology
Now in industrial circle, continuous expansion along with the plant design scale, the relatively dispersion that field apparatus is installed, cause signals collecting also to be disperseed very much, so a lot of control system adopt distributing to control, with the signal that remote I/O equipment is returned data acquisition, send to industrial control unit (ICU) and computer configuration monitoring software, industrial control unit (ICU) and computer configuration monitoring software send after treatment instruction by signal and control remote I/O equipment.Application on existing market is that the remote I/O equipment of each producer uses the communications protocol of each producer more widely; the Profibus agreement of German Siemens for example; the ControlNet of U.S. Rockwell, DeviceNet agreement etc.; these specialized protocols are due to the protection reason of brand; open little; range of application is narrower, can not realize a kind of remote I/O equipment simultaneously can with the controller communication of multiple product card series.
Due to the publicity of Modbus protocol source code, free property, the manufacturer of various products can develop the communication apparatus product based on the Modbus agreement; Remote I/O equipment based on the Modbus rtu protocol has been arranged in the market, the communication interface of this equipment is the RS232 serial communication interface, and communication distance need be in 15 meters, and communication speed is the highest can only reach 38.4KB/s, in the situation that the communication data amount is large, the efficiency of communication is lower; Owing to being serial communication interface, when crashing appearred in this remote I/O equipment, port data can return to initial condition during restarting in addition, and the state before can not keeping crashing, can impact subscriber equipment like this.
Summary of the invention
The present invention seeks to provides a kind of IO of Ethernet based on Modbus Tcp module for the defect that prior art exists.The present invention is during effectively solution equipment crashes and to restart, and port data remains the state before crashing; What this equipment adopted is Modbus TCP technology, and what physical layer was walked is the standard ethernet line, and communication distance can reach 90 meters, in the situation that increase optical-fibre communications, can reach a kilometer rank.Communication speed can reach 100MB/s, and communication efficiency has greatly improved.
The present invention for achieving the above object, adopt following technical scheme: a kind of IO of Ethernet based on Modbus Tcp module comprises DC power supplier, TVS circuit, light-coupled isolation module, microprocessor, watchdog circuit, ferroelectric memory, tcp module, RJ45 serial ports, I2C bus encoder/decoder and power driver module; Described DC power supplier is connected on microprocessor by TVS circuit and optical coupling isolation circuit successively; Described microprocessor is connected with described watchdog circuit, ferroelectric memory and tcp module are two-way respectively; Described tcp module also with described two-way connection of RJ45 serial ports; Described microprocessor is connected with power driver module by the I2C bus encoder/decoder.
Beneficial effect of the present invention: when the present invention occurred crashing when equipment, the output port state before equipment utilization I2C bussing technique can crash equipment kept, and the port device state can not change during equipment is restarted, and can not use and impact subscriber equipment; What the present invention adopted is Modbus TCP technology, and what physical layer was walked is the standard ethernet line, and communication distance can reach 90 meters, in the situation that increase optical-fibre communications, can reach a kilometer rank.Communication speed can reach 100MB/s, and communication efficiency has greatly improved.
The accompanying drawing explanation
Fig. 1 schematic diagram of the function of the present invention.
Embodiment
Shown in Figure 1, for a kind of IO of Ethernet based on Modbus Tcp module, comprise DC power supplier 6, TVS circuit 5, optical coupling isolation circuit 4, microprocessor 3, watchdog circuit 2, ferroelectric memory 1, tcp module 7, RJ45 serial ports 8, I2C bus encoder/decoder 9 and power driver module 10; 6 of described DC power supply moulds are connected on microprocessor 3 by TVS circuit 5 and optical coupling isolation circuit 4 successively; Described microprocessor 3 is respectively with described watchdog circuit 2, ferroelectric memory 1 with tcp module 7 is two-way is connected; Described tcp module 7 also with described two-way connection of RJ45 serial ports 8; Described microprocessor 3 is connected with power driver module 10 by I2C bus encoder/decoder 9.
Concrete, after entering this module, standard Modbus Tcp IO modular power source input of the present invention and external input signal at first to pass through the TVS circuit, and TVS is a kind of high-effect protection device of diode form.When the two poles of the earth of TVS diode are subject to reverse transient state high energy impact events, it can be with 10 the speed of bearing 12 power second-times, the high impedance of its two interpolar is become to Low ESR, the surge power of absorption up to thousands of watts, make the voltage clamp of two interpolars in a predetermined value, effectively protect the precision components in electronic circuit, avoid the damage of various surge pulses; Whether house dog of the present invention detects tcp module by microprocessor (NXP1752 components and parts) in real time and crashes, when crashing appears in detection module, NXP1752 sends a network Rapid reset signal restarts tcp module, and assurance is connected with the reliable of host computer or industrial control unit (ICU); At tcp module, crash and during tcp module restarted, before the I2C bus encoder/decoder latched and crashes, the state of output port, refreshing the I2C bus encoder/decoder after the normal operation of tcp module, tcp module is restarted Shi Buhui use is impacted to subscriber equipment like this; Modbus Tcp Ethernet IO module integration of the present invention the TCP chip, support the Modbus Transmission Control Protocol of standard, the Modbus Transmission Control Protocol of standard is supported: write coil, read coil, write register, read register, read-write register.The TCP chip just can will gather the signal of returning and support controller and the configuration software of Modbus Transmission Control Protocol to carry out exchanges data by the RJ45 port like this.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. the IO of the Ethernet based on Modbus Tcp module, it is characterized in that, comprise DC power supplier, TVS circuit, light-coupled isolation module, microprocessor, watchdog circuit, ferroelectric memory, tcp module, RJ45 serial ports, I2C bus encoder/decoder and power driver module; Described DC power supplier is connected on microprocessor by TVS circuit and optical coupling isolation circuit successively; Described microprocessor is connected with described watchdog circuit, ferroelectric memory and tcp module are two-way respectively; Described tcp module also with described two-way connection of RJ45 serial ports; Described microprocessor is connected with power driver module by the I2C bus encoder/decoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102380763A CN103414625A (en) | 2013-06-14 | 2013-06-14 | Ethernet IO module based on Modbus Tcp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102380763A CN103414625A (en) | 2013-06-14 | 2013-06-14 | Ethernet IO module based on Modbus Tcp |
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| CN103414625A true CN103414625A (en) | 2013-11-27 |
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| CN2013102380763A Pending CN103414625A (en) | 2013-06-14 | 2013-06-14 | Ethernet IO module based on Modbus Tcp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330699A (en) * | 2014-11-03 | 2015-02-04 | 合肥工业大学 | DC carrier based photovoltaic accessing monitoring system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101118528A (en) * | 2007-08-31 | 2008-02-06 | 中兴通讯股份有限公司 | Method and apparatus for recovering I2C bus locked by slave device |
| CN101179576A (en) * | 2007-12-05 | 2008-05-14 | 上海电器科学研究所（集团）有限公司 | Multi-protocol industry Ethernet adapter |
| US20100217967A1 (en) * | 2007-08-28 | 2010-08-26 | Abb Research Ltd | Real-time communication security for automation networks |
| CN201708820U (en) * | 2010-04-03 | 2011-01-12 | 天正集团有限公司 | Protocol converter of MODBUS and PROFIBUS-DP |
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2013
- 2013-06-14 CN CN2013102380763A patent/CN103414625A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100217967A1 (en) * | 2007-08-28 | 2010-08-26 | Abb Research Ltd | Real-time communication security for automation networks |
| CN101118528A (en) * | 2007-08-31 | 2008-02-06 | 中兴通讯股份有限公司 | Method and apparatus for recovering I2C bus locked by slave device |
| CN101179576A (en) * | 2007-12-05 | 2008-05-14 | 上海电器科学研究所（集团）有限公司 | Multi-protocol industry Ethernet adapter |
| CN201708820U (en) * | 2010-04-03 | 2011-01-12 | 天正集团有限公司 | Protocol converter of MODBUS and PROFIBUS-DP |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330699A (en) * | 2014-11-03 | 2015-02-04 | 合肥工业大学 | DC carrier based photovoltaic accessing monitoring system and method |
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Application publication date: 20131127 |