CN1567114A - Wireless local area network field bus network control station - Google Patents
Wireless local area network field bus network control station Download PDFInfo
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Abstract
The invention relates to the field of automatic control, in particular to a wireless local area network field bus network control station for industrial field control. The system comprises a control master station and an I/O module, wherein the control master station operates a wireless local area network field bus protocol stack, completes distributed I/O control through an I/O module controller and also receives and transmits data to the Ethernet through a wireless local area network transmission module; the I/O module finishes the acquisition and conversion of field signals. The intelligent control device based on the wireless Ethernet changes a Distributed Control System (DCS) structure combining a distributed system (DCS) with a distributed system into a novel full-distributed structure, thoroughly disperses a control function to a field, can realize the control function by depending on a network control station, is particularly suitable for transforming a traditional industrial control system, and enables an old enterprise automation system to directly enter a field bus era.
Description
Technical field
The present invention relates to automation field, is a kind of WLAN (wireless local area network) fieldbus networks control station that is used for industry spot control specifically.
Background technology
Field bus control system (FCS, Fieldbus Control System) is owing to characteristics such as its opening, dispersiveness and interoperability manipulation become one of developing direction of following infant industry control system.Yet also there are problems in the development of field bus technique at present, does not most importantly form a unified consensus standard.Owing to vary between the different field bus communication agreements, realize that the interconnected and interoperability between the different bus product is very difficult, this not only makes the superiority of field bus control system be difficult to embody, and increased technology and the investment risk that the user uses, be unfavorable for the development of field bus technique and apply.
In the prior art, field control system comprises field mounted pneumatic instrument control system, electrodynamic element combination type analog blind controller system, centralized digital control system, Distributed Control System (DCS), wherein mainly is Distributed Control System (DCS) (DCS).DCS adopts one or more control modules that multiloop is controlled, and its control section is distributed on some control panels, and one or more loops are arranged on each control panel.In the process that the DCS system forms, owing to be subjected to early stage this defect influence of system lock that exists of computer system, the product of each producer establishes one's own system, the equipment of different manufacturers can not be interconnected, this solution based on sealing, special use is difficult to realize exchanging and interoperability, and the network system of forming wider information sharing exists a lot of difficult.
What form sharp contrast therewith is that one of mainstream technology of the business computer communications field---Ethernet but develops very fastly, obtains the technology and the product support in the whole world.Ethernet since open good, be widely used, lower-price characteristic, not only monopolized the network service market of commercial field substantially, and also obtained large-scale application at industrial control field (mainly being) at enterprise management level and key-course.Simultaneously, with WLAN (wireless local area network) (IEEE 802.11b) is that the wireless communication technology of representative has been passed through the development in several years, no matter is the perfect of agreement self, or properties of product is stable and compatible, significant progress has all been arranged, can satisfy the requirement that Industry Control is used; The more important thing is between Ethernet and WLAN (wireless local area network), can pass through access point (AP, Access Point) realize seamless interconnected, thereby the condition of providing convenience for WLAN devices.At present wireless ethernet being applied to Fieldbus Control does not appear in the newspapers as yet.
Summary of the invention
Realize the defective that caused by the closed system of dedicated network in order to overcome communication, the purpose of this invention is to provide a kind of WLAN (wireless local area network) fieldbus networks control station, the distributing system structure that it combines the DCS centralization and decentralization, become novel all distributed structure, control function thoroughly is distributed to the scene, relies on control station itself just can realize control function.
To achieve these goals, technical scheme of the present invention is as follows:
The present invention relates to following several gordian techniquies:
1) the seamless access WLAN (wireless local area network) of I/O (I/O) module that how will disperse, and can connect Ethernet by WLAN (wireless local area network), thus can each I/O module of transparent access in Ethernet;
2) I/O of main website administration module provides the function of diagnosis and dynamic management I/O module;
3) wireless local area network communications module has identical internal communication interface with I/O module centre;
4) hot plug and the plug and play technique of support I/O module.
The present invention includes controlling center, I/O module two parts, wherein:
-controlling center, operation of wireless lan field bus protocol stack, by I/O module controller managing I/O module, finish distributed I/O control, also pass through its WLAN (wireless local area network) transport module transceive data to Ethernet, realize the wireless transmission of data and any the moving in the effective range, and realize seamless interconnected with Ethernet;
-I/O module links to each other with controlling center by general purpose I/O terminal base, finishes the collection and the conversion of on-site signal, and each I/O module is all supported hot plug and plug and play;
Wherein said I/O module controller comprises:
-Di 1 central processing unit is in charge of the I/O module, and the field data of I/O module collection is sent to double port memory;
-double port memory is finished the exchanges data between the 2nd central processing unit of described the 1st central processing unit and described wireless local area network communications module;
-storer, comprise the 1st random access memory and the 1st programmable read only memory, needed internal memory when wherein the 1st random access memory is used as the 1st central processing unit and carries out work, the 1st programmable read only memory then are used for deposit operation system kernel and WLAN (wireless local area network) field bus protocol stack;
-complicated programmable logic device is connected with central processing unit and double port memory, carries out communication by I/O internal bus and I/O module, finishes identification, the attended operation of I/O module.
Described wireless local area network communications module, the interface of compliant wireless local area networks standard is provided, link to each other with the 2nd central processing unit, the 2nd random access memory, the 2nd programmable read only memory, carry out exchanges data, and be connected with Ethernet, comprising: interconnective WLAN (wireless local area network) media access controller through access point, the WLAN (wireless local area network) baseband module, modulator-demodular unit, power amplifier and antenna, and link to each other with Ethernet by access point; Described wireless local area network communications module both can be used as the communication interface of the on-the-spot main equipment of wireless ethernet, also can be used as the communication interface of slave unit, wireless local area network communications module can be encoded to the data that send and receive by its WLAN (wireless local area network) media access controller, can automatically utilize the WLAN (wireless local area network) media access controller to carry out frame check to receiving data simultaneously in receiving data procedures;
Described WLAN (wireless local area network) field bus protocol stack runs on the wireless local area network communications module, be responsible for the message of WLAN (wireless local area network) is handled, form by field bus management layer module, fieldbus application layer module, fieldbus socket module, field bus management layer module and fieldbus application layer module are connected with the host computer application program through host driver by the double port memory in the host card access modules controlling center; Fieldbus socket module and field bus management layer module, the mutual communication of fieldbus application layer module export data to wireless lan interfaces by TCP/IP again, are transferred on the Ethernet by access point then;
Described field bus management layer module finished address assignment, sign location and applied clock synchronizing function, idiographic flow is: at first fetch data from the system management pipeline, judge the success or not of peek state then, if do not have success then get back to the system management pipeline, if success then judge which kind of primitive; If request primitive is then judged the services request kind, wherein judgement formula is the set device attribute, removes device attribute, query facility physics item, and equipment is confirmed; If indication, then the protocol Data Unit decoding that fieldbus socket module is sent here divides following situation to respond, concrete judgement formula is the set device property response, the response of removing device attribute, query facility physics item is replied, and equipment is confirmed response;
Described fieldbus application layer module is the interface that provides for the data communication between user's application process, mainly is responsible for three kinds of services: territory management, variables access and incident management; User's application process is when calling the fieldbus application layer services, all service parameters needed are provided, after by the fieldbus application layer services data process being encoded then, pass to fieldbus socket module, call tcp data transmission service data are sent; When receiving, fieldbus socket module is responsible for monitoring the communication port of TCP, after receiving data from communication port, be uploaded to the fieldbus application layer services, by the fieldbus application layer services according to purpose functional block example in the service message, the data that receive are sent to corresponding user's application process in the client layer, corresponding parameter are upgraded and further processing by user's application process;
Idiographic flow is: at first fetch data from application layer management pipeline, judge the success or not of peek state then, if successfully do not get back to application layer management pipeline, if the success would judge which kind of primitive, if request primitive is then judged the services request kind, wherein judgement formula is the territory upload service, the event report service, the service of reading, information issuing service; If indication, then the protocol Data Unit decoding that fieldbus socket module is sent here divides following situation to respond, and specifically judgement formula is for setting the territory download service, and acknowledging time report service changes the event condition monitor service, writes service.
The present invention is used for the WLAN (wireless local area network) Fieldbus Control equipment of on-site data gathering and control in complete process robotization or the manufacturing automation field.The core technology of control station---WLAN (wireless local area network) field bus communication agreement, based on WLAN standard IEEE 802.11b, in conjunction with TCP (UDP)/IP agreement, field bus protocol, be the wireless field device communication agreement that is applicable to the opening of industry spot control.It has following advantage:
1. be widely used.Can be applied to the automation control area of industries such as chemical industry, petrochemical industry, pharmacy, metallurgy, mining, electric power, food processing, the energy, digital control system.
2. have the decentralised control characteristics.The present invention has discarded I/O unit and the control station of DCS, the I/O function of the control function of DCS control station and DCS is distributed to field apparatus on the network, thereby constitute the virtual controlling station, realized decentralised control completely, embodied the high dispersion of system architecture.
3. has the robotization integration capability.The closed system that the present invention has broken through in the DCS system by dedicated network adopts man-to-man equipment line, connect respectively by control loop and to realize the drawback that caused, become based on sealing, special-purpose solution based on come into the open, standardized solution, owing to adopted the present invention, can place field apparatus to the control module, the input/output module that are in the pulpit in the original DCS system, be convenient to the automation equipment of standard is linked to be system by the wireless ethernet network, realize the various functions of comprehensive automation.
4. the opening that has system.Open consistance, the publicity that is meant relevant criterion, emphasize to the common recognition of standard with defer to.Because communication protocol of the present invention is consistent to be disclosed, and can realize message exchange between the equipment of each different manufacturers.The present invention is devoted to set up the open system of unified factory's bottom-layer network, and the user can forming the random system of size from different suppliers' product, can construct the open interacted system of automatic field by this product by needs and the consideration of oneself.
5. have interoperability and interoperability.The interoperability that the present invention had, be meant realize between the InterWorking Equipment, the information between system transmits and link up; Interoperability means that then equipment can be realized mutual alternative like the performance classes of different manufacturers.
6. the intellectuality and the function autonomy that have field apparatus.The present invention with sensing measurement, compensation calculate, quantities is handled with functions such as control is distributed to and finishes in the field apparatus, only depends on field apparatus just can finish the basic function of automatic control, and the running status of diagnostic device at any time.
7. has good mobility.Owing to adopt wireless local area network technology, use radio magnetic wave as transmission medium, so the present invention can move arbitrarily, be not subjected to the restriction of the communications cable in the effective range of access point (AP).
8. seamless integrated with Ethernet.Because the effect of AP, wireless device can be by AP and Ethernet interconnection.And,, can realize seamless integrated with Ethernet easily so be transparent for the upper-layer user because Ethernet and WLAN (wireless local area network) all are the agreements under TCP (UDP)/IP.
Because the present invention has above characteristics, the particularly use of the simplification of field bus system structure and WLAN (wireless local area network) is the control system slave unit, be installed to normal operation and repair and maintenance thereof, all embodies superiority.As:
1. save hardware quantity and investment.Because being dispersed in on-the-spot smart machine, the present invention can directly carry out multiple sensing control warning and computing function, thereby can reduce the quantity of transmitter, no longer need independent regulator, computing unit etc., functional unit and complicated connections the thereof such as signal condition, conversion, isolation that also no longer need the DCS system, can also be with the industry control PC as active station, thereby saved a large number of hardware investment, and can reduce the floor area of pulpit.
2. saving erected cost.Owing to adopted wireless local area network technology, AP can covering diameter all field apparatuss in 100 meters (can arrive 1000 meters after installing power amplifier additional), thereby the consumption of cable, terminal, groove box, crane span structure significantly reduces, and the workload of connecting line equipment and joint check and correction also significantly reduces.When needs increase field apparatus, need not to set up new cable, can directly use, both saved investment, also reduced the workload of design, installation.
3. saving maintenance costs.Because the present invention has the ability of self diagnosis and simple fault processing, and being sent to the pulpit by the diagnosis maintenance information that digital communication will be correlated with, the user can inquire about the operation of all devices, the diagnosis maintenance information, so that early stage analyzing failure cause is also got rid of fast, shortened and safeguarded shut down time; Simultaneously, reduce line and reduced maintenance workload because system architecture is simplified.
4. the user has the system integration initiative of height.The equipment that adopting user of the present invention freely to select different vendor is provided comes integrated system, avoid being defined the range of choice of using equipment because of the product of having selected a certain brand, can not be stymied by, system integration power is firmly grasped in user's hand because of agreement incompatible in the system integration, interface.
5. the accuracy and the reliability of system have been improved.Because intellectuality of the present invention, digitizing are compared with simulating signal, it has fundamentally improved the degree of accuracy of measuring with control, has reduced the transmission error; Owing to the designs simplification of system and the use of wireless local area network technology, equipment and line reduce simultaneously, and the field instrument built-in function is strengthened, and have reduced the round-trip transmission of signal, have improved the functional reliability of system.
6. be easy to management, monitoring.Because Ethernet and WLAN (wireless local area network) is seamless integrated, field data can clog-freely directly be sent to administration and supervision authorities, is convenient to the enterprise administrator retrieve data, the watch-dog operation conditions.
Description of drawings
Fig. 1 is a hardware block diagram of the present invention.
Fig. 2-the 1st, controlling center circuit block diagram of the present invention.
Fig. 2-the 2nd, the circuit theory diagrams of Fig. 2-1.
Fig. 3 is a field bus protocol stack program structure diagram of the present invention.
Fig. 4 is a field bus management layer program flow diagram of the present invention.
Fig. 5 is a fieldbus application layer program flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As shown in Figure 1, the present invention includes controlling center, I/O module two parts, that is:
Controlling center operation of wireless lan field bus protocol stack is finished distributed I/O control by I/O module controller managing I/O module, also is responsible for by WLAN (wireless local area network) transport module transceive data simultaneously to Ethernet; Realize the wireless transmission of data and any the moving in the effective range, and realize seamless interconnected with Ethernet.
The I/O module links to each other with controlling center by general purpose I/O terminal base, finishes the collection and the conversion of on-site signal, and each I/O module is all supported hot plug and plug and play; Read when all comprising a configuration information storer (containing information such as module type, port number, sequence number) in each I/O module for the controlling center control and management; Each I/O module can provide 128 I/O address scopes; When forming system, the master station module address is distributed by agreement, and each module's address is distributed automatically by master station module; In case formed system, then each I/O module has just been distributed unique address, so each I/O module will be transparent in bus; When having reinstalled a certain I/O module, can under charged situation, carry out heat interchange, and all can automatically modules configured information be uploaded to controlling center; Therefore can replace out of order I/O module at system's run duration, the module of main website its new installation of verification automatically whether with former module compatibility; If compatible, then join automatically in the main website configuration information, whole process does not need to use the host computer intervention, can not influence the normal operation of other module.
Eight different I/O modules are dynamically controlled, managed to the controlling center maximum, present embodiment has been listed 7 kinds of different I/O modules as shown in Figure 1, is: each the I/O module that meets the field bus protocol standard is as eight/16 tunnels analogy load module AI, eight/16 tunnels analogy output module AO, eight/16 passage digital input module DI, eight/16 passages numeral output module DO, eight/16 path thermocouple module TC, eight/16 aisle resistance temperature sensing module RTD, eight/16 passage pulse width modulation module PWM.
General purpose I/O terminal base is responsible for connecting controlling center and I/O module, constitutes the high-speed channel of the data transmission between controlling center and the I/O module, and the data allocations and the address assignment of the I/O of dynamic organization module, holds the heat interchange of I/O module.
Shown in Fig. 2-1,2-2, controlling center of the present invention comprises I/O module controller, WLAN (wireless local area network) transport module, and the I/O module controller consists of:
-Di 1 central processor CPU 1 is in charge of the I/O module; And the field data of I/O module collection is sent to double port memory DPRAM;
-double port memory DPRAM finishes the visit between the 2nd central processor CPU 2 of described the 1st central processor CPU 1 and described wireless local area network communications module;
-storer, comprise the 1st random access memory ram 1 and the 1st programmable read only memory EPROM1, needed internal memory when wherein the 1st random access memory ram 1 is used as the 1st central processor CPU 1 and carries out work, the 1st programmable read only memory EPROM1 then are used for deposit operation system kernel and WLAN (wireless local area network) field bus protocol stack;
-complicated programmable logic device CPLD is connected with central processing unit and double port memory DPRAM, carries out communication by I/O internal bus and I/O module, finishes identification, the attended operation of I/O module;
Described wireless local area network communications module, the interface of compliant wireless local area networks standard is provided, the 2, the 2nd programmable read only memory EPROM2 links to each other with the 2nd central processor CPU the 2, the 2nd random access memory ram, wherein: the 2nd random access memory ram 2 is used as the 2nd central processor CPU 2 needed internal memory when carrying out work, and be connected with Ethernet through access point AP, provide the WLAN (wireless local area network) visit of standard to connect; Comprise interconnective WLAN (wireless local area network) media access controller CHIP1, adopt the ISL3873D chip, WLAN (wireless local area network) baseband module CHIP2, adopt the HFA3783 chip, modulator-demodular unit CHIP3, adopt the ISL3685 chip, power amplifier CHIP4 adopts ISL3984 chip and antenna Antenna, and links to each other with Ethernet by access point AP.
Wherein: the 1st～2 random access memory ram 1～RAM2 adopts the CY7C109 chip, the 1st～2 programmable read only memory EPROM1～EPROM2 adopts the 28SF040 chip, the 1st central processor CPU 1 adopts i386EX chip and the 2nd central processor CPU 2 to adopt the AT9140080 chip, complicated programmable logic device CPLD adopts the XC9572 chip, and double port memory DPRAM adopts the IDT7133 chip.
Wireless local area network communications module both can be used as the communication interface of the on-the-spot main equipment of wireless ethernet, also can be used as the communication interface of slave unit, wireless local area network communications module can be encoded to the data that send and receive by its WLAN (wireless local area network) media access controller CHIP1, can automatically utilize WLAN (wireless local area network) media access controller CHIP1 to carry out frame check to receiving data simultaneously in receiving data procedures.The 1st central processor CPU 1 of being responsible for the I/O management carries out exchanges data with the 2nd central processor CPU 2 that responsible operating system and WLAN (wireless local area network) field bus protocol stack move through double port memory DPRAM, and passes through complicated programmable logic device CPLD through I/O internal bus control I/O module.
As shown in Figure 3, described WLAN (wireless local area network) field bus protocol stack, run on the wireless local area network communications module, be responsible for the message of WLAN (wireless local area network) is handled, form by field bus management layer module SM, fieldbus application layer module APP, fieldbus socket module Socket, field bus management layer module SM and fieldbus application layer module APP are connected with the host computer application program through host driver by the double port memory DPRAM in the host card access modules controlling center; Fieldbus socket module Socket and field bus management layer module SM, the mutual communication of fieldbus application layer module APP, export data to wireless lan interfaces (WLAN standard IEEE 802.11b) by TCP (UDP)/IP again, be transferred on the Ethernet by access point AP then.
As shown in Figure 4, field bus management layer module SM finishes functions such as address assignment, sign location and applied clock be synchronous, idiographic flow is: at first fetch data from the system management pipeline, judge the success or not of peek state then, if do not have success then get back to the system management pipeline, if success then judge which kind of primitive.If request primitive is then judged the services request kind, wherein judgement formula is the set device attribute, removes device attribute, query facility physics item, and equipment is confirmed; If indication, then the protocol Data Unit decoding that fieldbus socket module is sent here divides following situation to respond, concrete judgement formula is the set device property response, the response of removing device attribute, query facility physics item is replied, and equipment is confirmed response.
As shown in Figure 5, fieldbus application layer module APP is the interface that provides for the data communication between user's application process, and it mainly is responsible for three kinds of services: territory management, variables access and incident management; User's application process is when calling the fieldbus application layer services, all service parameters needed should be provided, after by the fieldbus application layer services data process being encoded then, pass to fieldbus socket module Socket, call TCP (UDP) data transport service data are sent.
When receiving, fieldbus socket module Socket is responsible for monitoring the communication port of TCP (UDP), after receiving data from communication port, be uploaded to the fieldbus application layer services, by the fieldbus application layer services according to purpose functional block example in the service message, the data that receive are sent to corresponding user's application process in the client layer, corresponding parameter are upgraded and further processing by user's application process.
Idiographic flow is: at first fetch data from application layer management pipeline, judge the success or not of peek state then, if successfully do not get back to application layer management pipeline, if the success would judge which kind of primitive, if request primitive is then judged the services request kind, wherein judgement formula is the territory upload service, the event report service, the service of reading, information issuing service; If indication, then the protocol Data Unit decoding that fieldbus socket module is sent here divides following situation to respond, and specifically judgement formula is for setting the territory download service, and acknowledging time report service changes the event condition monitor service, writes service.
Claims (8)
1. WLAN (wireless local area network) fieldbus networks control station is characterized in that: comprise controlling center, I/O module two parts, wherein:
-controlling center, operation of wireless lan field bus protocol stack, finish distributed I/O control by I/O module controller managing I/O module, also pass through its WLAN (wireless local area network) transport module transceive data to Ethernet, realize the wireless transmission of data and any the moving in the effective range, and realize seamless interconnected with Ethernet;
-I/O module links to each other with controlling center by general purpose I/O terminal base, finishes the collection and the conversion of on-site signal, and each I/O module is all supported hot plug and plug and play.
2. according to the described WLAN (wireless local area network) fieldbus networks of claim 1 control station, it is characterized in that: described I/O module controller comprises:
-Di 1 central processing unit (CPU1) is in charge of the I/O module, and the field data of I/O module collection is sent to double port memory (DPRAM);
-double port memory (DPRAM) is finished the exchanges data between the 2nd central processing unit (CPU2) of described the 1st central processing unit (CPU1) and described wireless local area network communications module;
-storer, comprise the 1st random access memory (RAM1) and the 1st programmable read only memory (EPROM1), needed internal memory when wherein the 1st random access memory (RAM1) is used as the 1st central processing unit (CPU1) and carries out work, the 1st programmable read only memory (EPROM1) then are used for deposit operation system kernel and WLAN (wireless local area network) field bus protocol stack;
-complicated programmable logic device (CPLD) is connected with central processing unit and double port memory (DPRAM), carries out communication by I/O internal bus and I/O module, finishes identification, the attended operation of I/O module.
3. according to the described WLAN (wireless local area network) fieldbus networks of claim 1 control station, it is characterized in that: described wireless local area network communications module, the interface of compliant wireless local area networks standard is provided, with the 2nd central processing unit (CPU2), the 2nd random access memory (RAM2), the 2nd programmable read only memory (EPROM2) links to each other, carry out exchanges data, and be connected with Ethernet through access point (AP), comprise: interconnective WLAN (wireless local area network) media access controller (CHIP1), WLAN (wireless local area network) baseband module (CHIP2), modulator-demodular unit (CHIP3), power amplifier (CHIP4) and antenna, and link to each other with Ethernet by access point (AP).
4. according to the described WLAN (wireless local area network) fieldbus networks of claim 3 control station, it is characterized in that: described wireless local area network communications module both can be used as the communication interface of the on-the-spot main equipment of wireless ethernet, also can be used as the communication interface of slave unit, wireless local area network communications module can be encoded to the data that send and receive by its WLAN (wireless local area network) media access controller (CHIP1), can automatically utilize WLAN (wireless local area network) media access controller (CHIP1) to carry out frame check to receiving data simultaneously in receiving data procedures.
5. according to the described WLAN (wireless local area network) fieldbus networks of claim 1 control station, it is characterized in that: described WLAN (wireless local area network) field bus protocol stack runs on the wireless local area network communications module, be responsible for the message of WLAN (wireless local area network) is handled, by field bus management layer module (SM), fieldbus application layer module (APP), fieldbus socket module (Socket) is formed, field bus management layer module (SM) and fieldbus application layer module (APP) are connected with the host computer application program through host driver by the double port memory (DPRAM) in the host card access modules controlling center; Fieldbus socket module (Socket) and field bus management layer module (SM), fieldbus application layer module (APP) communication mutually, export data to wireless lan interfaces by TCP (UDP)/IP again, be transferred on the Ethernet by access point (AP) then.
6. according to the described WLAN (wireless local area network) fieldbus networks of claim 5 control station, it is characterized in that: described field bus management layer module (SM) finished address assignment, sign location and applied clock synchronizing function, idiographic flow is: at first fetch data from the system management pipeline, judge the success or not of peek state then, if do not have success then get back to the system management pipeline, if success then judge which kind of primitive; If request primitive is then judged the services request kind, wherein judgement formula is the set device attribute, removes device attribute, query facility physics item, and equipment is confirmed; If indication, then the protocol Data Unit decoding that fieldbus socket module is sent here divides following situation to respond, concrete judgement formula is the set device property response, the response of removing device attribute, query facility physics item is replied, and equipment is confirmed response.
7. according to the described WLAN (wireless local area network) fieldbus networks of claim 5 control station, it is characterized in that: described fieldbus application layer module (APP) is the interface that provides for the data communication between user's application process, mainly is responsible for three kinds of services: territory management, variables access and incident management; User's application process is when calling the fieldbus application layer services, all service parameters needed are provided, after by the fieldbus application layer services data process being encoded then, pass to fieldbus socket module (Socket), call TCP (UDP) data transport service data are sent; When receiving, fieldbus socket module (Socket) is responsible for monitoring the communication port of TCP (UDP), after receiving data from communication port, be uploaded to the fieldbus application layer services, by the fieldbus application layer services according to purpose functional block example in the service message, the data that receive are sent to corresponding user's application process in the client layer, corresponding parameter are upgraded and further processing by user's application process;
Idiographic flow is: at first fetch data from application layer management pipeline, judge the success or not of peek state then, if successfully do not get back to application layer management pipeline, if the success would judge which kind of primitive, if request primitive is then judged the services request kind, wherein judgement formula is the territory upload service, the event report service, the service of reading, information issuing service; If indication, then the protocol Data Unit decoding that fieldbus socket module is sent here divides following situation to respond, and specifically judgement formula is for setting the territory download service, and acknowledging time report service changes the event condition monitor service, writes service.
8. according to the described WLAN (wireless local area network) fieldbus networks of claim 1 control station, it is characterized in that: the I/O module that described controlling center maximum is dynamically controlled, managed is eight, can be: eight/16 tunnels analogy load modules (AI), eight/16 tunnels analogy output modules (AO), eight/16 passage digital input modules (DI), eight/16 passages numeral output module (DO), eight/16 path thermocouple modules (TC), eight/16 aisle resistance temperature sensing modules (RTD) and/or eight/16 passage pulse width modulation modules (PWM).
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