CN103889074A - WIA-PA wireless network adapter device oriented at HART equipment - Google Patents
WIA-PA wireless network adapter device oriented at HART equipment Download PDFInfo
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- CN103889074A CN103889074A CN201210554512.3A CN201210554512A CN103889074A CN 103889074 A CN103889074 A CN 103889074A CN 201210554512 A CN201210554512 A CN 201210554512A CN 103889074 A CN103889074 A CN 103889074A
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Abstract
The invention relates to an apparatus capable of carrying out information interaction with a wired field bus device, particularly to a wireless networks for industrial automation (WIA)-PA wireless network adapter device oriented at HART equipment. With the device, the field bus device can be connected to the WIA. The positive terminal of the wireless network adapter device is used for being connected with a power supply; and the negative terminal is used for connecting a positive terminal of a wired instrument. The wireless network adapter device comprises a filtering amplifying circuit, a power supply circuit, a WIA wireless communication module, a microprocessor, a modulation-demodulation module, and a bypass protection circuit. According to the invention, the device, together with the wired instrument, is connected in series to a current loop, so that the wired instrument can be accessed to the WIA by the wireless network adapter device.
Description
Technical field
The present invention relates to a kind of can and wired field bus device between the device of interactive information, and field bus device can be accessed to intelligent wireless network WIA(Wireless Networks forIndustrial Automation by this device).
Background technology
Intelligent wireless network WIA is based on short-distance wireless communication IEEE802.15.4 standard, use free frequency band, solve multipath effect wireless signal reflection, scattering being caused at large-scale apparatus, metallic conduit etc., and the electromagnetic noise that the running of motor, apparatus produces disturbs radio communication, provide highly reliable, real-time radio Communications service.Intelligent wireless network WIA technology is specially adapted to Industry Control and factory automation process control, and is widely used in the fields such as oil, chemical industry, metallurgy, mine.
Most of oil, chemical enterprise have hundreds of intelligent instrument.These instrument generally all adopt wired mode to be connected with control room.This wired connection is by forming measuring-signal and the control signal in the control of current loop transmittance process, and current loop also provides the electric energy of consumption for part instrument simultaneously.In addition, be connected by the intelligent network of wireless formation self-organizing, selfreparing with the wireless instrument of WIA technology.Wireless instrument adopts low power dissipation design to use powered battery, has significantly reduced the wiring cost of the outlying and difficult arrival area such as oil tank, mine.
On the one hand, these traditional wired HART instrument can detect abundant process control information and status information of equipment.But due to reasons such as scene transformation difficulty, wiring cost are high, control centre has only read the PV(master variable of instrument conventionally) etc. simple information, most information is idle.On the other hand, wired instrument and wireless WIA instrument are worked in same factory, and an urgent demand is imported the data of wired instrument in WIA network into by minimum change.
Summary of the invention
For prior art above shortcomings part, the technical problem to be solved in the present invention is to provide a kind of WIA-PA wireless network adaptive device towards HART equipment, for wired Instrument connection is used during to WIA network.
The technical scheme that the present invention adopted is for achieving the above object: a kind of WIA-PA wireless network adaptive device towards HART equipment, the plus end of described wireless network adaptive device is used for connecting power supply, negative terminal is for connecting the plus end of wired instrument, and described wireless network adaptive device comprises:
Filter amplification circuit, connects two terminals and the power supply circuits of described wireless network adaptive device, for input signal being carried out to filtering and amplifying;
Power supply circuits, connect WIA wireless communication module and described filter amplification circuit, are used to WIA wireless communication module that electric energy is provided;
WIA wireless communication module, connects microprocessor and power supply circuits, for send wireless signal under the control of microcontroller;
Microprocessor, connects WIA wireless communication module and modulation /demodulation module, and mutual for WIA wireless communication module, also for controlling the modulation and demodulation of modulation /demodulation module to HART analog signal;
Modulation /demodulation module, connects negative terminal and the described microcontroller of described wireless network adaptive device;
Bypass protection circuit, two ends connect two terminals of described wireless network adaptive device.
Described power supply circuits comprise
Pressure drop control module, input connects HART bus, and output connected system supply module, is used to system power supply module that burning voltage is provided;
System power supply module, connect microprocessor, pressure drop control module and charge control module, for by the voltage transitions of input being, for microprocessor power supply and for energy-storage travelling wave tube charge;
Charge control module, connected system supply module, microprocessor and energy-storage travelling wave tube, under the control of microprocessor, the charging that realizes energy-storage travelling wave tube enables;
Energy-storage travelling wave tube, connects charge control module and WIA supply module, for storage of electrical energy;
Microprocessor, controlling charge control module is energy-storage travelling wave tube charging, controlling WIA supply module is the power supply of WIA wireless communication module;
WIA supply module, connects energy-storage travelling wave tube and microprocessor, for according to WIA procotol, under the control of microprocessor, for described WIA wireless communication module provides electric energy.
Described system power supply module adopts TPS61070 chip, and the 2V direct current of input is changed into 3.3V DC power supply.
Described microprocessor adopts the M430F149 low-power scm of TI company.
Described charge control module is metal-oxide-semiconductor or analog switch chip.
Described energy-storage travelling wave tube is selected super capacitor, and capacitance is not less than 0.25F.
Described microprocessor also connects reset circuit.
Described modulation /demodulation module comprises modulation circuit, demodulator circuit, analog switch, partiting dc capacitor and load resistance;
Described power supply circuits are made up of two branch roads in parallel, and two ends connect the negative terminal of microprocessor and described wireless network adaptive device: one route modulation circuit and analog switch are in series; Another route demodulator circuit, partiting dc capacitor and load resistance are in series.
Described modulation circuit is made up of analog filter.
The present invention has the following advantages:
1. the invention provides a kind of wireless adaptation device device, be together connected in current circuit with wired instrument, make wired instrument to access WIA wireless network by wireless adaptation device.
2.WIA network can complete variable to wired instrument by wireless adaptation device and read, state-detection, and order transmission waits operation.
3. device will be connected in the current loop of wired instrument, and uses current loop for device power supply.Install procedural information and the state information that inner analog circuit and microcontroller can reading instrument and write control command to instrument, built-in with wireless module and WIA network be through the news that work, thereby make the information access WIA network of wired instrument.
Accompanying drawing explanation
Fig. 1 is the industrial control system topological diagram that has wireless adaptive device;
Fig. 2 is the connection layout of wireless adaptation device and wired instrument current loop;
Fig. 3 is wireless adaptation device circuit structured flowchart;
Fig. 4 is wireless adaptation device process chart.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 has shown the industrial control system of WIA wireless adapter 10 topological diagrams, comprising: backstage WIA server 11; Industrial Ethernet 12; The traditional structure that control room 19 and wired HART instrument 22 form.WIA radio network gateway 14, wireless HART instrument 23, by the WIA network with self-organizing adaptation function that interface 17 connects the wired HART instrument 18 of tradition of WIA wireless adaptation apparatus 16 and the WIA wireless adapter 15 that uses as relaying forms; Backstage WIA server 11 comprises industrial computer, operating system and application software composition.Its function has been the functions such as the storage of the configuration to equipment, the control to equipment under network, detection analysis of information collection, data.Common wired HART instrument 22 is connected with control room by 2 line 4-20mA interface 21 processed.4-20mA interface 20 can connect WIA wireless adapter 16 by interface 17, other devices communicatings 15,23,14 etc. in wireless adapter 16 wireless signals 24 and WIA network like this, and the information exchange of wired instrument is crossed wireless adaptation device will access WIA network.Interface 17 can not affect wired HART instrument 18 by the work between 4-20mA interface 20 and control room 19.In WIA network, gateway is by gateway network interface 13 access industrial Ethernets 12, a gateway can link many wireless WIA equipment by wireless signal 24, as the WIA wireless adapter 15 of relaying, WIA wireless adapter 16 can networking together with wireless HART instrument 23, and in the situation that not connecting wired instrument, can be configured to network trunk as the WIA wireless adaptation 15 of relaying.
The connection layout of Fig. 2 WIA wireless adaptation device and wired instrument current loop, comprises WIA wireless adapter 16, wired HART instrument 18, interface 17, control room 19 and WIA network 25.The current loop anode 26 in control room is connected with the plus end 31 of wireless adapter, and current loop negative terminal 27 is connected with wired instrument HART Interface Terminal negative terminal 30.Wired instrument HART Interface Terminal anode 29 is connected with the negative terminal 32 of wireless adapter by connecting line 28.WIA wireless adapter 16 carries out communication by wireless signal 24 and WIA network 25.Interface 17 guarantee to guarantee WIA wireless adapter put 16 and wired HART instrument 18 between the connecting together of safety and firmness.Control room 19 can be the one-level main website in HART bus, is equivalent to power supply 36 and forms with load resistance 37, and power supply 36 is for instrument provides electric current, and on current loop anode 26 by standard HART signal and wired HART instrument 18 communications.Load resistance 37 effects are control loop pressure drops, and size is determined by wired HART instrument 18, the resistance that adopts 500 ohm of 2W as normal in thermometer.WIA wireless adapter 16 is connected in series in current loop, thus the standard HART digital signal superposeing on can sending and receiving current loop.The 16 internal circuits equivalences of WIA wireless adapter with one with the variable Resistance model for prediction 33 of curent change resistance, can be to the change of the magnitude of current in circuit, so can not affect wired HART instrument 18 and the controlled quentity controlled variable of interface 17 and the transmission of amount of information in loop.WIA wireless adapter 16 can do secondary main equipment on HART current loop, if on loop without one-level main equipment, wireless adaptation device also can be configured to one-level main equipment.
Fig. 3 WIA wireless adaptation device circuit structured flowchart, by the electric circuit constitutes such as bypass protection 41, filter circuit 42, voltage control circuit 45, system module 46, WIA wireless communication module 51, microprocessor 52, HART modulation circuit 53 and HART modulation circuits 54.The plus end 31 of wireless adapter and the negative terminal 32 of wireless adapter are connected in series in HART current loop, and electric current flows into from internal loop positive 58 through the plus end 31 of wireless adapter, finally flows out from the negative terminal 32 of wireless adapter.Bypass protection 41 is connected in parallel between internal loop positive 58 and internal loop negative 59; its effect is to prevent electric current and the excessive damage internal circuit of voltage; it can clamp down under a safe voltage in the time of loop fault, if thereby running into the large voltage of large electric current can short circuit not affect the unimpeded of other equipment.Therefore, this partial circuit can adopt voltage-stabiliser tube and zener to protect, and also can adopt the method design of multi-stage protection according to the requirement of shelter of Different field.In order to measure the magnitude of current on loop, the voltage drop control 43 of connecting on internal loop negative 59, as far as possible little in order not affect loop dropping resistor value, for example select 10 ohm of 2W, 43 liang of termination differential signal amplifiers 44 of voltage drop control.It is positive and negative 58,59 that 46 liang of ends of system module are connected on internal loop, after the loop current signal that amplify through amplifier at voltage drop control 43 two ends converts voltage signal to, is connected with voltage drop circuit.Its effect is according to internal loop positive 58, in internal loop negative 59, the variation of electric current changes the voltage drop between the plus end 31 of wireless adapter and the negative terminal 32 of wireless adapter, do so on the one hand as power module produces pressure drop, can control on the other hand the pressure drop charge power that limits super capacitor 49 that matches with charging control circuit 47 and in the situation that loop current changes, keep power invariability.Voltage control part can be designed to the methods such as controllable resistor and realize, and also can adopt energising to press fiducial chip and 44 outputs of differential signal amplifier to compare by adjustable voltage stabilizing chip and will between current loop, be limited in safe scope.System module 46 is connected in parallel on voltage control circuit 45, for other circuit are the chip power supplies such as microprocessor, operational amplifier on the one hand, on the other hand for charging control circuit 47 provides electric energy.System module 46 can be selected linear voltage stabilization chip or DC-DC module.Charging control circuit 47 can be made up of analog switching circuit and voltage stabilizing circuit, and its function is charge and control charging voltage below 2.2V for super capacitor 49.WIA supply module 48 can be formed and be formed by DC-DC module and linear voltage stabilization chip and electric capacity electric weight supervisory circuit.Its function is the operating voltage that the voltage transitions of super capacitor 49 anodes is become to wireless module.Super capacitor 49 is electric energy storage device, is charged as WIA wireless communication module 51 electric energy is provided by charging control circuit 47, and the type selecting of its capacity has relation by the transmitting power of WIA wireless communication module 51 and the conversion efficiency of WIA supply module 48.Microcontroller processor 52 can be for having the low-power scm of the external equipment such as serial ports and timer.Its function, on the one hand by transmission of information between serial ports and WIA wireless communication module 51, is carried out modulation and demodulation to the HART analog signal on loop on the other hand.HART receiving course: first send the simulation HART signal on internal loop negative 59 to microprocessor 52 by HART demodulator circuit 54 with the form of digital waveform after 5.11 load resistances 56 and partiting dc capacitor 57, demodulator circuit part can be made up of comparator and voltage reference circuit; Signal is analyzed conversion by microprocessor 52, sends with the form of wireless signal 24 through WIA wireless communication module 51.HART process of transmitting: WIA wireless communication module 51 is passed to microprocessor 52 by serial ports after receiving the WIA network information by wireless signal 24; Signal after microprocessor 52 analyzing and processing sends to HART modulation circuit 53 with the form of digital waveform, and HART modulation circuit 54 can be made up of analog filter, and digital waveform signal is smoothed to analog sinus signals; Last analog signal sends on internal loop negative 59 through analog switch device 55.
Pressure drop control module 45 is made up of voltage stabilizing chip and peripheral circuit thereof.System power supply module 46 adopts TPS61070 chip, and the 2V direct current of input is changed into 3.3V DC power supply.Microprocessor 52 adopts the M430F149 low-power scm of TI company.Charge control module 47 is metal-oxide-semiconductor or analog switch chip.A charge control module 47 voltage stabilizing chip in parallel.Described voltage stabilizing chip adopts TLV3491.Energy-storage travelling wave tube 49 is selected super capacitor, and capacitance is not less than 0.25F.WIA supply module 48 is made up of DC-DC chip and peripheral circuit thereof.
Fig. 4 WIA wireless adapter course of work Figure 66, block diagram is from starting in the of 4.First, carrying out initialization 61 in order to configure the normal need of work of wireless adaptation device, the operation such as it comprises loader, is written into historical data, initialization analog switch, Detection capacitance voltage.Next, wireless adaptation device just enters and connects from equipment state 62, and it, is found as the standard HART instrument from equipment to transmitting apparatus polling message in HART bus by current loop, reads from the essential information of equipment and keeps in communication.Then, wireless adaptation device will connect WIA network 63, the essential information of instrument be passed to background server and carry out device configuration, according to controlling can configuring and the renewal frequency of WIA network with actual needs of power consumption.Enter after processing transmission of information 64, wireless adaptation device is by the information of processing and transmitting from instrument and WIA network.If when wireless adaptation device and instrument now disconnect, wireless adaptation device is still present in WIA network with the state of network trunk.Finally, enter and finish 65, wireless adaptation device will enter resting state and wait for startup next time.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210554512.3A CN103889074A (en) | 2012-12-19 | 2012-12-19 | WIA-PA wireless network adapter device oriented at HART equipment |
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| CN201210554512.3A CN103889074A (en) | 2012-12-19 | 2012-12-19 | WIA-PA wireless network adapter device oriented at HART equipment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682545A (en) * | 2007-04-13 | 2010-03-24 | Hart通信基金会 | Wireless protocol adapter |
| WO2012125169A1 (en) * | 2011-03-11 | 2012-09-20 | Awiatech, Corporation | Method and apparatus for incorporating a wirelesshart-enabled device into a wired hart network |
| WO2012129043A2 (en) * | 2011-03-18 | 2012-09-27 | Honeywell International Inc. | Adapter device for coupling an industrial field instrument to an industrial wireless network and related system and method |
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2012
- 2012-12-19 CN CN201210554512.3A patent/CN103889074A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682545A (en) * | 2007-04-13 | 2010-03-24 | Hart通信基金会 | Wireless protocol adapter |
| WO2012125169A1 (en) * | 2011-03-11 | 2012-09-20 | Awiatech, Corporation | Method and apparatus for incorporating a wirelesshart-enabled device into a wired hart network |
| WO2012129043A2 (en) * | 2011-03-18 | 2012-09-27 | Honeywell International Inc. | Adapter device for coupling an industrial field instrument to an industrial wireless network and related system and method |
Non-Patent Citations (2)
| Title |
|---|
| 张华良等: "HART仪表无线适配器设计", 《仪器仪表标准化与计量》 * |
| 韩军清: "HART无线适配器的研究与设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
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