CN105404243B - Flow control and manufacturing execution system in industrial production line - Google Patents

Flow control and manufacturing execution system in industrial production line Download PDF

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CN105404243B
CN105404243B CN201410431237.5A CN201410431237A CN105404243B CN 105404243 B CN105404243 B CN 105404243B CN 201410431237 A CN201410431237 A CN 201410431237A CN 105404243 B CN105404243 B CN 105404243B
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information
workstation
tpok
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CN105404243A (en
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康乐
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Ladder Electronic Integrated Manufacturing Service Suzhou Co Ltd
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Ladder Electronic Integrated Manufacturing Service Suzhou Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/80—Management or planning

Abstract

The invention discloses a flow control and manufacturing execution system in an industrial production line, which comprises: the central server comprises a TPOK central database server and a main application server, a client service platform, a basic data and report query platform, a test file server and an information acquisition terminal which are connected to the main application server, an ERP central database server which is connected to the TPOK central database server, and the information of the main application server and the test file server is mutually transmitted with the TPOK central database server. The invention combines the methods of internal coding, client coding, internal coding and client bar code, completely meets the customization requirement of the client to the bar code, avoids the repetition of bar code information to the maximum extent, provides the production accuracy and the information query speed, and realizes the traceability of raw materials and products.

Description

Flow control and manufacturing execution system in industrial production line
Technical Field
The invention relates to a process control and manufacturing execution system in an industrial production line, which is used for system control in an electronic integrated manufacturing production process.
Background
In the electronic industry, especially the SMT manufacturing industry, the requirements for cost and accuracy are increasing day by day, and especially for small-batch and multi-variety production manufacturing enterprises, the requirements for fine production are particularly outstanding. To achieve the production of small-batch and multi-variety products, strict control needs to be performed on product types, production schedules, material investment and tracking, manufacturing processes, test processes, quality and manpower investment, for machines with different customer requirements and different design requirements, if the machines are processed by manual recording and handwritten process cards, fine production is difficult to achieve, especially for companies with small-batch and multi-variety manufacturing, dozens of manufacturing processes, hundreds of test instruments, thousands of machines and tens of thousands of raw materials, a targeted production control system is particularly important, and the outstanding problems solved by the system are in the following aspects:
production management: a complete production flow comprises a feeding point, a surface chip mounter, a plurality of inspection points and a plurality of test points (AOI/FCT/ICT), when a plurality of products are produced simultaneously, the work stations required to be selected by each machine type can be the same or different, if station passing information is managed and traced by hands completely, the possibility of error is very high, and for PCBs of the type of a link board or a double-sided board, the complexity cannot accurately control production and trace by a manual recording mode;
material management: for the SMT machine, once the feeding is wrong, the product repair rate and the raw material throwing rate can be greatly improved, a lot of manpower is needed for testing and maintaining, and when the SMT machine is used for manual feeding, complete accuracy is difficult to ensure through manual inspection;
in addition, for aviation and medical products and the like, material information needs to be strictly traced, and the information is difficult to record manually;
and (3) managing a serial number: as a substitute, customers also have requirements for respective bar codes, and how to avoid the repetition of serial numbers for different models of multiple customers cannot be solved through manual recording;
and (3) test management: the test is a key means for controlling the quality of the electronic product, if the result is visually observed and manually recorded by a tester, the missing test and the misjudgment are difficult to avoid, and the main three tests are AOI, ICT and FCT, wherein the AOI test mode and the standardization are strong, but how to confirm the serial numbers of the link plate and the front and back panels according to the test result of the system;
and (3) capacity and yield analysis: after the production of a batch of products is finished, the average station passing time, the station passing rate per unit time, the yield, a failure analysis and the like of each station must be based on the station passing situation of the actual serial number.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a process control and manufacturing execution system in an industrial production line, which is used for strictly controlling product types, production schedules, material input and tracking, manufacturing processes, test processes, quality and manpower input during the production of small-batch and multi-variety products.
First, prior to a detailed description of the technical solution, the related art to which the present invention relates will be described.
TPOK is a manufacturing execution system (manufacturing execution system) of MES, which is classified according to different industry requirements, the flow and specific implementation of MES are different, and TPOK is a customized development platform of MES which focuses on small-batch multi-variety electronic manufacturing.
The TPOK system comprises two parts in terms of architecture: 1) basic data maintenance and report form query page; 2) data acquisition and recording tools (e.g., station-crossing, testing, and packaging procedures). Net open source framework development, the main functions of the former are personnel authority role management, workstation, production line, bad and maintenance classification management, work order, material number, manufacturing process, serial number and other basic information management, and the information is the beginning of SN life cycle; in addition, the page platform also provides the inquiry of production data and tracing information. The later is a program set for various data acquisition and front-end operation, which is developed based on Net 2.0 Windows form/Mobile and comprises procedures of passing stations, packaging, maintaining, testing, feeding, upper and lower-order correlation procedures and the like, the procedures are mainly used for users to finish the acquisition of production and material data, in a process of maintaining complete, any serial number must pass stations according to a predefined process sequence, and the next station is used for clamping the front station. In addition, the data acquisition module comprises automatic test result acquisition, so that the influence of human errors on the accuracy of test results is prevented, the test files are automatically thrown to the central test server, the monitoring of the front station state and the analysis of the test results are completed under the processing of a multithreading program, and finally the test data are synchronized into the database.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a process control and manufacturing execution system in an industrial production line, comprising:
the central Server comprises a TPOK central database Server based on SQL Server and a main application Server based on NetframkWork, wherein the TPOK central database Server is used for storing relevant data information from each process, and the main application Server is used for controlling the production process of each process;
the client service platform is connected to the main application server; the system is connected with an acquisition workstation, a maintenance workstation, a packaging workstation and a station-crossing device, and is used for information acquisition, equipment maintenance, product packaging and station-crossing of products; the collecting workstation and the packaging workstation are connected with bar code printers for automatically printing serial number labels, receiving labels and delivery labels, and online supplementing and printing materials to track the labels;
the basic data and report form query platform is connected to the main application server; the system is connected with a manager instrument panel workstation for report query; the system maintenance personnel workstation is connected with the system maintenance personnel workstation and is used for maintaining work orders, material numbers, serial numbers and basic information of the manufacturing process;
the test file server is arranged in a central machine room, is connected to the main application server, is used for processing test programs thrown by various workstations, is connected with a plurality of test workstations, and is connected with corresponding test equipment;
the ERP central database server is connected to the TPOK central database server; the scheduling information based on work order and material number synchronization is uploaded to the ERP central database and then uploaded to the TPOK central database server; the method comprises the steps that a material main key for raw material tracking produced during material receiving is uploaded to the ERP central database and then uploaded to the TPOK central database server;
the information acquisition terminal is connected to the main application server and is used for scanning the material main key during loading and online supplementing and printing a material main key label;
and the information of the main application server and the test file server is mutually transmitted with the TPOK central database server.
The information acquisition terminal adopts a wireless acquisition functional module which is a one/two-dimensional bar code gun, a WinMobile PDA or a pipeline fixed bar code gun.
The acquisition workstation, the maintenance workstation, the packaging workstation and the testing workstation all comprise computers or terminals, and the terminals are fixed terminals or handheld mobile terminals.
The system comprises a plurality of workstations, a query device and a database, wherein the query device is arranged in each computer of each workstation, and the computers and the workstations can query required data, current position of serial numbers, bad details and material correlation conditions through Web pages in enterprises.
According to the technical scheme, the flow control and manufacturing execution system in the industrial production line provided by the invention has the advantages that the specific manufacturing process is defined according to the model by analyzing the design requirements of customers, the virtual manufacturing process and the sub-manufacturing process are adopted in the setting of the manufacturing process to ensure the controllability and traceability of the production stage of the product, the information of each serial number is associated in the system through the bar code, the format flexibility of the bar code is particularly important for the production of multiple products and multiple customers, the invention combines the methods of internal coding, customer coding, internal coding, customer bar code and the like, completely meets the customization requirements of the customer on the bar code, avoids the repetition of bar code information to the greatest extent, and provides the production accuracy and the information query speed; in the selection of the label, a small-size (0.7 x 0.7cm) label can be attached to the PCBA board with a small space, and meanwhile, the size of the bar code does not influence the scanning accuracy; in the aspect of material tracking, the fact that the bar code exists in the material which is led means that each product does have a unique identity label, the label information can always accompany the whole product period, namely the information can be kept from the beginning of production to the product shipment, even when the product is assembled on the final product, and the product traceability is really realized; in the product production preparation stage, each label is pasted on PCBA or a certain core component, the system requires the raw materials and the labels to be bound in the production link, and the system can automatically check whether the raw material attribute and the loading position meet the requirements in the process, so that the raw materials are traced; each test result and maintenance record of the product is associated with a product label in the test stage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a process control and manufacturing execution system in an industrial manufacturing line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a process control and manufacturing execution system in an industrial manufacturing line according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a material-dependent operation of a process control and manufacturing execution system in an industrial manufacturing line according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an automatic testing and time management and control testing operation of a process control and manufacturing execution system in an industrial production line according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating a working principle of a packing and warehousing process of a process control and manufacturing execution system in an industrial production line according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Based on fig. 1, the basic structure of the present invention is:
a process control and manufacturing execution system in an industrial production line, comprising:
the central Server comprises a TPOK central database Server based on SQL Server and a main application Server based on NetframkWork, wherein the TPOK central database Server is used for storing relevant data information from each process, and the main application Server is used for controlling the production process of each process;
the client service platform is connected to the main application server; the system is connected with an acquisition workstation, a maintenance workstation, a packaging workstation and a station-crossing device, and is used for information acquisition, equipment maintenance, product packaging and station-crossing of products; the collecting workstation and the packaging workstation are connected with bar code printers for automatically printing serial number labels, receiving labels and delivery labels, and online supplementing and printing materials to track the labels;
the basic data and report form query platform is connected to the main application server; the system is connected with a manager instrument panel workstation for report query; the system is connected with a system maintenance personnel workstation and is used for maintaining basic information such as work orders, material numbers, serial numbers, manufacturing procedures and the like;
the test file server is arranged in a central machine room, is connected to the main application server, is used for processing test programs thrown by various workstations, is connected with a plurality of test workstations, and is connected with corresponding test equipment;
the ERP central database server is connected to the TPOK central database server; the scheduling information based on work order and material number synchronization is uploaded to the ERP central database and then uploaded to the TPOK central database server; the method comprises the steps that a material main key for raw material tracking produced during material receiving is uploaded to the ERP central database and then uploaded to the TPOK central database server;
the information acquisition terminal is connected to the main application server and is used for scanning the material main key during loading and online supplementing and printing a material main key label;
and the information of the main application server and the test file server is mutually transmitted with the TPOK central database server.
The information acquisition terminal adopts a wireless acquisition functional module which is a one/two-dimensional bar code gun, a WinMobile PDA or a pipeline fixed bar code gun.
The acquisition workstation, the maintenance workstation, the packaging workstation and the testing workstation all comprise computers or terminals, and the terminals are fixed terminals or handheld mobile terminals.
The system comprises a plurality of workstations, a query device and a database, wherein the query device is arranged in each computer of each workstation, and the computers and the workstations can query required data such as the current position of a serial number, bad details, material correlation conditions and the like through Web pages in an enterprise.
Based on the work flow chart described in fig. 2, the TPOK operation flow of the flow control and manufacturing execution system in the industrial production line disclosed by the present invention is as follows:
maintenance of basic data:
a product engineer and a system engineer need to maintain information such as a wire identification, a workstation, a terminal computer, an operator number, bad information, a maintenance code and the like in TPOK at first;
work order and finished product material number information are synchronized to TPOK from an ERP system through a background script every night, and results of quantity, version and BOM are also stored; in addition, based on the planned classification of the work order, the shop floor (SMT, integrated manufacturing, or cable manufacturing) for the work order processing can be known;
(II) maintaining production batch information:
after the work order and the finished product material number are synchronized, the work order information is required to be maintained, and the work order information mainly comprises three aspects of process information, finished product characteristics and a serial number:
firstly, after process information, a work order and a finished product material number are imported into TPOK, a production plan and a product engineer are required to select board throwing time and production line grade in a system, the most suitable line grade is found according to the suggestion of the system, or the suitable sub-line grade is customized, for example, a certain product may be a semi-finished product of a customer, only hand welding and testing are needed, the product engineer can select hand welding and testing by himself to establish an independent sub-line grade, and the customizable process setting scheme meets various requirements of the customer to the greatest extent and achieves the greatest flexibility;
then the finished product characteristic, the finished product may be PCBA board, cabinet, cable, etc., their information has the vital influence to the serial number and cross the station too, the board may be a single plate or yoke plate, whether the front and back or single face, if it is the yoke plate that requires in the time of cross the station or testing, all serial numbers in the yoke plate of one pass; in addition, the packaging type and the material tracing type are provided, and the packaging type and the material tracing type are introduced in the subsequent introduction of the packaging and the material tracing;
the TPOK logically requires that the serial number in a finished product material number is unique, so that the repetition of the serial number is avoided, based on the requirement, the TPOK allows the use of an internal bar code and a client bar code, the serial number is registered according to each worksheet under the product, and in various bar code formats, the invention adopts a small label which is washable and high temperature resistant and is 0.7cm by 0.7cm for printing a two-dimensional code, and a specific coding rule is adopted, so that the repetition of the serial number is avoided, and the production time is flexibly displayed; the serial number format is specified by a product engineer, when the serial number is distributed, a barcode printer only needs to input the number, the serial number is automatically generated according to the number, and the barcode is automatically printed by a network barcode printer, so that the operation time is saved, and the possibility of errors is reduced (for example: TIMS-is a fixed input, a special format [ Y, 2] in middle brackets represents a two-bit year, such as 14 ═ 2014; [ W, 2] represents a two-bit week, such as 32 weeks, [ S, 10#10#10#10#, S represents a serial number, 10# represents a decimal number 0-9, such as 00032, and the serial number spliced according to the rule is TIMS-143200032); for customers with definite requirements on the bar codes, encoding rules can be provided, such as year, month, day and week, fixed input, serial numbers, and decimal and hexadecimal encoding modes are selected, so that the system can flexibly and conveniently print the bar codes in various formats according to requirements;
(III) material correlation:
referring to fig. 3, after the serial number registration and the printing of the barcode label are completed, the serial number can be generated in the system, and if the serial number is a single board or a sequential link board, the automatic allocation can be clicked, and the operation of the allocation can be completed at one time; for multi-link plates, single and double panels or plates containing scrapped plates, manual distribution is needed through a bar code gun, a work order and a complete serial number exist in the system, and the next step is material tracing, which specifically comprises the following steps:
step 1, the information amount of material tracing is large, the content is complex, multiple departments need to maintain in parallel, a program provides a multi-interface authority control platform and mail reminding combination, and the integrity of main information of material tracing, such as production date, production batch, manufacturer, manufacturing material number and the like, is ensured; in addition, on an on-machine attribute interface, material association types need to be defined, and for small-batch and multiple varieties, the number of materials is smaller but more than that of batches, and the materials are loaded according to the sequence number, so that the inaccuracy caused by frequent material change is controlled;
step 2, 3, the program files of the SMT high-speed machine and the universal machine contain material information and corresponding station information, the program obtains required information such as a serial number, the station information, loading frame information and a material number through a regular expression and a keyword processing mode, and the information is used as a comparison table during loading scanning to achieve the effect of preventing wrong loading; the three processes of SMT parts, manual welding and wave soldering relate to feeding operation, materials are classified according to a material table uploaded by SMT in a trial production stage, production is carried out according to the material table determined by research and development in mass production, and the feeding and material detecting efficiency is greatly improved;
step 4, 5, preparing materials according to a loading table, before using, performing material main key scanning and loading frame bar code scanning through a PDA of a motorola 9090, using C # mobile-based development, based on WinMobile5.0 program, mainly having the functions of database connection, WebService use and input information comparison and database writing, updating the lower-order materials of the serial numbers according to specific time points during loading by an algorithm, if the serial number S1 is before the station is passed, the material M1 is completely loaded, all S1 are automatically carried with the M1, if M1 is used up and M2 is used as a substitute, the material of S1 becomes M2, and after M1 is loaded, the station passing of serial number S2 is completed, even if M2 reloads, the material of S2 is still M1, and compared with the pure comparison of the station passing time of other programs, the method saves the station passing query time and improves the accuracy of station passing information acquisition;
and (IV) automatic testing and time management and control testing:
referring to fig. 4, loading is typically a process that occurs prior to inspection and testing operations, and a board that has completed loading can only enter the next station; through feeding, slow-release control, the conditions of wrong feeding and dislocation can be basically avoided, but the plate is poor due to unpredictable conditions and design problems in the welding process, the following test is the key of quality control, and the test contents of different products are different;
TPOK extracts the same or similar test contents (such as ICT and AOI), throws the test results into the test file server, and performs multi-thread processing through the powerful processing capability of the server, whereas for many FCT tests, a customized program is required to obtain the test results, and the steps are as follows:
step 1, the test file type can also be maintained in advance as the attribute of the model, and currently, more than one thousand test procedures exist, and the program result collection is divided into three types: the local computer is automatic, centralized processing and time control, if the local computer is automatic, the serial number cross-station state can be verified through text file handshaking and DLL (dynamic link library) calling of database access, and a test result is written into the database; the time control method mainly provides a forced test means for the programs which are long in time and cannot obtain test results, so that test omission is prevented, but the test results need to be manually input; the third centralized process is mainly discussed;
step 2, a judging function is added at a serial number scanning entrance, the judging function is realized in different Windows application programs and DLLs through WebService and classes, and the problem that a test file cannot be analyzed due to the fact that a program method is not used by a model is avoided;
step 3, for the test class which does not need to upload the test file, the state of the board to be tested can be directly judged through the calling of the DLL, whether the board is bad or not and whether the board is abnormal when the board passes through the station or not are judged, if the board is normal and the current station is indeed the test station, a test program is started for testing, and after the test is finished, a test result and bad information (the position of the board, the address of a part and the bad phenomenon) are automatically thrown out and are synchronized to a database;
step 4, if uploading is needed, synchronizing and sharing the test files according to a predefined client file path, after the test files are generated from a production line test machine, monitoring the state of the test files by a program, trying to obtain the read-write right of the files, synchronizing the read-write right to a test file server, uniformly filing according to classification, wherein the server program is a multi-thread self-adaptive file processor and comprises a file number analysis function, a thread manager, a thread processing mechanism and a thread cleaning finishing function, and mainly searches for a corresponding test file format according to the model attribute of a serial number, analyzes the file format and uploads a test result; for successfully tested serial numbers, files are moved to a specific folder for archiving; for exception handling, the system will perform reprocessing within a period of time, or remind the administrator of the exception through an email;
(V) poor treatment and maintenance:
when the defects occur at the moment, the times of misjudgment are determined according to the upper limit of the defect times which is defined by a product engineer and a test engineer in advance, so that the misjudgment rate is effectively reduced, and the production efficiency is improved;
predefined bad codes such as short circuit, passage, cold solder joint and the like can be automatically selected, the part positions of the PCBA board can be read out through the test file, if the final serial number is bad, the PCBA board enters a maintenance station to wait for maintenance, and the board which is not maintained cannot pass through the post-station;
after the maintenance personnel finish the maintenance, the board can select any historical test station in the manufacturing process to retest, and the board can pass the station after the test is passed;
and (VI) packaging and warehousing:
referring to fig. 5, when all assembly and testing processes are completed, the last station is the packaging, and in order to prevent the hidden trouble in the process, a quality inspection station is added before the packaging, and the steps are as follows:
step 1, checking all the station passing and test results, setting packaging as a general inspection for preventing missing detection and station leakage, checking whether all the set stations pass the station or not according to the process of SN, and checking whether all the tests pass or not, so that the packaging station is the last checkpoint in the TPOK serial number process;
step 2, the number of each box is set in the finished product material number, when a first serial number is scanned, the material number information can be automatically brought out, the scanned serial numbers must be consistent with the first serial number model, the number is continuously accumulated, and after the number reaches the number maintained by each box, the boxes are automatically stored and outer box labels are printed; quality departments can carry out spot check according to the outer container labels, and finished products without the outer container labels are prevented from being delivered, so that the conditions of station leakage and detection leakage in the system are avoided.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the above-described embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A process control and manufacturing execution system in an industrial production line, comprising:
the central Server comprises a TPOK central database Server based on SQL Server and a main application Server based on NetframkWork, wherein the TPOK central database Server is used for storing relevant data information from each process, and the main application Server is used for controlling the production process of each process;
the client service platform is connected to the main application server; the system is connected with an acquisition workstation, a maintenance workstation, a packaging workstation and a station-crossing device, and is used for information acquisition, equipment maintenance, product packaging and station-crossing of products; the collecting workstation and the packaging workstation are connected with a bar code printer for automatically printing serial number labels, receiving labels and delivery labels, and online supplementing and printing material tracing labels;
the basic data and report form query platform is connected to the main application server; the system is connected with a manager instrument panel workstation for report query; the system maintenance personnel workstation is connected with the system maintenance personnel workstation and is used for maintaining work orders, material numbers, serial numbers and basic information of the manufacturing process;
the test file server is arranged in a central machine room, is connected to the main application server, is used for processing test programs thrown by various workstations, is connected with a plurality of test workstations, and is connected with corresponding test equipment;
the ERP central database server is connected to the TPOK central database server; the scheduling information based on work order and material number synchronization is uploaded to the ERP central database and then uploaded to the TPOK central database server; the method comprises the steps that a material main key for raw material tracking produced during material receiving is uploaded to the ERP central database and then uploaded to the TPOK central database server;
the information acquisition terminal is connected to the main application server and is used for scanning the material main key during loading and online supplementing and printing a material main key label;
and the information of the main application server and the test file server is mutually transmitted with the TPOK central database server.
2. The system of claim 1, wherein the information collection terminal is a one/two-dimensional barcode gun, a Win Mobile PDA, or a pipeline fixed barcode gun.
3. The system of claim 1, wherein the collection station, the maintenance station, the packaging station, and the testing station comprise computers or terminals, and the terminals are fixed terminals or handheld mobile terminals.
4. The system of claim 3, further comprising a query engine, wherein the query engine is disposed in each computer of each workstation, and the computers and workstations can query the data required by the Web pages inside the enterprise: the current position of the serial number, bad details and material correlation conditions.
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