Systems and methods that integrate radio frequency identification (RFID) technology with industrial controllers

The subject invention relates to systems and methods that provide electronic data (e.g., Electronic Product Code (EPC) data) obtained from Radio Frequency Identification (RFID) tags by RFID readers and/or from servers to one or more industrial components (e.g., controllers, programmable logic controllers, modules, etc.). The systems and methods employ component that processes, if desired, and stores received electronic data as records within a table. Processing includes filtering for data of interest and/or formatting the data in a suitable structure. Storage can include delineating related electronic data across rows the table and types of data across columns of a row. Upon receiving a subscription and/or request for electronic data from the one or more industrial components, the data can be retrieved and conveyed to the subscribing and/or requesting components.

RELATED APPLICATIONS

This application is related to co-pending U.S. patent application Ser. No. 10/985,173 filed on Nov. 10, 2004 and entitled “SYSTEMS AND METHODS THAT INTEGRATE RADIO FREQUENCY IDENTIFICATION (RFID) TECHNOLOGY WITH AGENT-BASED CONTROL SYSTEMS,” the entirety of which is incorporated herein by reference.

TECHNICAL FIELD

The subject invention relates to industrial control systems and, more particularly, to systems and methods that provide electronic product data to industrial control components.

BACKGROUND OF THE INVENTION

Industrial controllers are special purpose processing devices used for controlling (e.g., automated and semi-automated) industrial processes, machines, manufacturing equipment, plants, and the like. A typical controller executes a control program or routine in order to measure one or more process variables or inputs representative of the status of a controlled process and/or effectuate outputs associated with control of the process. Such inputs and outputs can be digital and/or analog, assuming a continuous range of values. A typical control routine can be created in a controller configuration environment that has various tools and interfaces whereby a developer can construct and implement a control strategy using industrial and conventional programming languages or graphical representations of control functionality. Such control routine can be downloaded from the configuration system into one or more controllers for implementation of the control strategy in controlling a process or machine.

Measured inputs received from a controlled process and outputs transmitted to the process can pass through one or more input/output (I/O) modules in a control system. Such modules can serve in the capacity of an electrical interface between the controller and the controlled process and can be located local or remote from the controller. Inputs and outputs can be recorded in an I/O memory. The input values can be asynchronously or synchronously read from the controlled process by one or more input modules and output values can be written directly to memory by a processor for subsequent communication to the process by specialized communications circuitry. An output module can interface directly with a controlled process by providing an output from memory to an actuator such as a motor, drive, valve, solenoid, and the like.

During execution of the control routine, values of the inputs and outputs exchanged with the controlled process can pass through memory. The values of inputs in memory can be asynchronously or synchronously updated from the controlled process by dedicated and/or common scanning circuitry. Such scanning circuitry can communicate with input and/or output modules over a bus on a backplane or network. The scanning circuitry can also asynchronously or synchronously write values of the outputs in memory to the controlled process. The output values from the memory can be communicated to one or more output modules for interfacing with the process. Thus, a controller processor can simply access the memory rather than needing to communicate directly with the controlled process.

In distributed control systems, controller hardware configuration can be facilitated by separating the industrial controller into a number of control elements, each of which performs a different function. Particular control modules needed for the control task can then be connected together on a common backplane within a rack and/or through a network or other communications medium. The control modules can include processors, power supplies, network communication modules, and I/O modules exchanging input and output signals directly with the controlled process. Data can be exchanged between modules using a backplane communications bus, which can be serial or parallel, or via a network. In addition to performing I/O operations based solely on network communications, smart modules exist which can execute autonomous logical or other control programs or routines. Various control modules of a distributed industrial control system can be spatially distributed along a common communication link in several locations. Certain I/O modules can thus be located proximate a portion of the controlled equipment, and away from the controller. Data can be communicated with these remote modules over a common communication link, or network, wherein all modules on the network communicate via standard communication protocols.

In a typical distributed control system, one or more I/O modules are provided for interfacing with a process. The outputs derive their control or output values in the form of a message from a master or peer device over a network or a backplane. For example, an output module can receive an output value from a processor via a communications network or a backplane communications bus. The desired output value is generally sent to the output module in a message. The output module receiving such a message will provide a corresponding output (analog or digital) to the controlled process. Input modules measure a value of a process variable and report the input values to another device over a network or backplane. The input values can be used by a processor for performing control computations.

As noted above, industrial controllers can be utilized to control systems, machines, processes, etc. in the industrial automation and manufacturing environment. An evolving technology that is gaining more and more interest in this environment is Radio Frequency Identification (RFID), which leverages electronic data to mitigate scanning bar codes and/or opening containers to obtain product information. Suitable electronic product data can include Electronic Product Code (EPC) data as well as other product related data. A typical EPC is a unique number bit-encoded and embedded in an RFID tag (a small silicon chip with one or more antennas) affixed to an associated product. An RFID reader is a device that can be utilized to read and/or write RFID tag data, depending on read/write privileges. For example, an RFID reader can be utilized to read EPC and/or electronic data from an RFID tag via wireless (e.g., radio frequency (RF)) communication and/or write EPC and/or electronic data to an RFID tag. Electronic product data read from an RFID tag can be utilized to provide a greater degree of certainty over what goes into a supply chain and/or how to manage raw materials, warehouse inventory, shipments, logistics, and/or various other aspects of manufacturing. However, conventional systems that employ RFID technology generally convey electronic product data obtained by RFID readers from RFID tags to a PC based server that performs data filtering and management and provides interfaces to other industrial applications. Thus, there is a need to provide techniques that integrate RFID technology with industrial controllers.

SUMMARY OF THE INVENTION

The systems and methods of the subject invention provide novel techniques that integrate Radio Frequency Identification (RFID) technology with industrial controllers. The systems and methods provide for receiving electronic data such as Electronic Product Code (EPC) data or other product data from the physical RFID reader(s) and/or a server (e.g., Savant-like). Electronic data from RFID readers is received by RFID reader interfaces via vendor specific plug-ins, and electronic data from RFID related servers is received by server interfaces. The electronic product data can be filtered to discriminate between data of interest and other data and to mitigate receiving duplicate data, processed (e.g., where the EPC data is raw data) to a suitable format, and stored. Such storage can include delineating the electronic data across rows and columns of a table. Where the electronic product data includes EPC data, the table can store EPC code, logical reader, timestamps, various flags, etc. Stored data can be provided to one or more PLCs, controllers, modules, control applications, ERPs, MESs, and/or MCs, for example, upon receiving a subscription and/or request for such data. In addition, historical electronic product data and/or signal quality information associated with electronic product data can obtained and provided to a PLC, ERP, MES, and/or MC.

To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. However, these aspects are indicative of but a few of the various ways in which the principles of the invention can be employed. Other aspects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the drawings.

DETAILED DESCRIPTION OF THE INVENTION

The subject invention facilitates distribution of electronic product data such as Electronic Product Code (EPC) data to PLCs, controllers, modules, control applications, ERPs, MESs, and/or MCs, for example. The systems and methods integrate Radio Frequency Identification (RFID) technology with such industrial components. Electronic data residing in RFID tags can be received through RFID reader interfaces employing various vendor specific plug-ins, and electronic data residing in a server can be received through server interfaces. Received electronic product data can be filtered, processed, and stored, for example, as records in a table. Stored data can be provided to one or more PLCs, controllers, modules, control applications, ERPs, MESs, and/or MCs, for example, upon receiving a subscription and/or request for such data. In addition, historical electronic product data and/or signal quality information associated with electronic product data can obtained and provided to a PLC, ERP, MES, and/or MC.

FIG. 1illustrates a system100that facilitates electronic data exchange within an industrial environment. The system100includes a processing module110that exchanges electronic data with entities within industrial environment that store and/or convey electronic data. For example, the processing module110can exchange electronic data with various readers, writers, servers, storage components, etc. Such data can include unprocessed (e.g., raw data) and/or processed (e.g., filtered and formatted) electronic data. In addition, suitable electronic data can be compressed, encrypted, encoded, modulated within a carrier envelope, protected (e.g., password), etc. and conveyed as a data stream, one or more data bursts and/or one or more data packets, for example.

In one instance, the electronic data can be electronic product data (e.g., Electronic Product Code (EPC) data and other data associated with the product). Such data can be obtained from a Radio Frequency Identification (RFID) tag affixed to the product and read by devices such as RFID readers and/or stored in related servers. The communications channel between the processing module110and these devices can be through essentially any wire and/or wireless channel, including Ethernet (e.g., 10BASE-T, 100BASE-T and 1000BASE-T), serial port (e.g., RS-232 and RS-422), parallel port, coaxial cable, Infrared (IR), BlueTooth, Universal Serial Bus (USB), Firewire, and the like. In addition, the processing module can employ various interfaces to receive data from different sources (e.g., different device models, manufacturers, vendors, software revisions, etc.).

The processing module110can receive pushed and/or pulled data. In one example, a reader can periodically transmit or emit electronic data to the processing module110, which can accept or reject the electronic data, for example, based on whether the electronic data is data of interest to the industrial environment. Such data discrimination can be facilitated by filters or other software and/or hardware that pass and/or reject data. Alternatively and/or additionally, intelligence can be utilized to facilitate selection of suitable electronic data. In this instance, the intelligence can employ machine learning techniques that utilize statistics, probabilities, inferences, classifiers, etc. to render a decision as to whether electronic data should be accepted. In another example, the processing module110can transmit a message that indicates it is ready to receive electronic data. In yet another example, the processing module110can query electronic data, for example, from one or more other components, servers and/or databases.

The processing module110can operate on received electronic data. For example, the processing module110can filter, parse, and/or format electronic data. In addition, the processing module110can selectively extract and/or discard portions of the electronic data. Where the data is compressed, encrypted, encoded, modulated, protected, etc. the processing component110can act on the electronic product data in this state and/or decompress, decrypt, decode, demodulate, unprotect, etc. the data prior to acting on it. In addition, the processing module110can store the electronic data, for example, within local and/or remote storage components. For example, the processing module110can include various volatile and/or non-volatile memory that can be utilized to store the electronic data. Alternatively and/or additionally such memory can reside remote from the processing module110.

It is to be appreciated that the electronic data can be variously stored. For example, the data can be stored in records of a database, one or more binary files, one or more ASCII files, etc. Stored electronic data can be conveyed to an industrial control interface120, which can provide communication interfaces to convey at least a portion of the electronic data to one or more entities within the industrial environment (e.g., industrial controllers). Such interfaces can include essentially any interface, including subscribe and query based interfaces that enable an entity to subscribe to receive electronic product data and/or a signal quality indicator when such data becomes available and/or query saved electronic data.

It is to be appreciated that the system100can be integrated within one or more control systems. In one instance, the system100can reside and execute within an entity of a control system. In another instance, the system100can be an additional component that facilitates electronic data exchange as described herein. It is to be appreciated that the processing component110and/or the industrial control interface120can be software and/or hardware based. For example, these components can be implemented in essentially any programming language, such as, for example, C, C++, C# or Java based languages. In addition, a markup language such as Extensible Markup Language (XML) and/or Physical Markup Language (PML) can be utilized to define a system configuration, which can include information on mapping between logical-physical readers, available filters, etc.

FIG. 2illustrates a system200that provides electronic data to entities within an industrial environment. The system200includes an industrial control interface210that is utilized to communicate with industrial systems such as Enterprise Systems (ERPs), Manufacturing Execution Systems (MESs), Machine Control Systems (MCs), agent-based control systems, and the like, and components such a industrial controllers, programmable logic controllers, and/or industrial modules. As depicted, the industrial control interface can include one or more PLC interfaces220and one or more industrial protocols230. The one or more PLC interfaces220provide a mechanism for the industrial control interface210to exchange electronic data with an industrial controller, a PLC, etc. without having to utilize any industrial control protocol. For example, the industrial control interface210can be utilized to directly write to and/or read from I/O, tags, and/or memory (e.g., registers, buffers, RAM, cache, portable, etc.).

The one or more industrial protocols230provide various communication protocols for communication with industrial systems (e.g., ERPs, MESs, MCs, agent-based systems, etc.) and/or components (e.g., controllers, programmable logic controllers, modules, etc.). For example, the one or more industrial protocols230can include Control and Information Protocol (CIP) protocols for communicating via DeviceNet, ControlNet, EtherNet/IP, and/or Controller Area Network (CAN), fieldbus protocols for communicating via Profibus, Interbus-S, RIP, P-Net, and AS-i, Transport Control Protocol (TCP) and Internet Protocol (IP) for communicating via the Internet, NetBios Extended User Interface (NetBEUI) for communicating via Large and Wide Area Networks (LANs and WANs), File Transfer Protocol (FTP) for communicating with workstations, servers and the like, Hyper Text Transfer Protocol (HTTP) for communicating via the World Wide Web (WWW), etc.

The industrial control interface210can read electronic data from an industrial systems and/or component and convey the data to a processing module240, which can store and/or provide the data to other entities. For example, the processing module240can provide the electronic data to a reader, which can write the data to a RFID tag on a product and/or a server. In another example, the processing module240can directly provide the data to the server. In addition, the industrial control interface210can be utilized to transfer electronic data from the processing module240to one or more industrial systems and/or components. Such data can be obtained from an RFID product tag. Such data can be received as unprocessed or processed data and compressed, encrypted, encoded, modulated within a carrier envelope, protected (e.g., password), etc. In addition, the electronic data can be received as a data stream, one or more data bursts and/or one or more data packets via wire and/or wireless technologies. Moreover, the data can include EPC as well as other electronic data.

Received electronic product data can be processed and stored by the processing module240. Processing can include determining data of interest, wherein such data can be subsequently stored while other data is discarded; formatting the data, for example, prior to saving it; decompressing the data, decrypting the data, decoding the data, demodulating the data, unprotecting the data, transforming the data, etc. In one example, the data can be parsed by various characteristics and stored in a structured format. For example, similar data can be grouped and stored in a logical manner and/or a form suitable to the industrial systems and/or components. For example, the electronic data can be stored within rows and columns of a table. The stored data can be conveyed to the industrial systems and/or components through via the industrial control interface210. Conveyance of the stored data can be based on a subscription and/or query by the industrial systems and/or components for the data. The system200can be integrated in one or more industrial systems within an entity of a system or as an additional component, as described in connection with the system100ofFIG. 1.

FIG. 3illustrates an industrial control system300. The system300includes an arbitration component310that exchanges electronic data between industrial systems and/or components and product tags that store product related information. The arbitration component310includes a processing module320and an industrial control interface330. The processing module320can be substantially similar to the processing modules110and240described previously in connection withFIGS. 1 and 2, respectively. Likewise, the industrial control interface330can be substantially similar to industrial control interfaces120and210described previously in connection withFIGS. 1 and 2, respectively. For example, the industrial control interface330can include one or more protocols340that facilitate data exchange with industrial systems (e.g., ERPs, MESs, MCs, agent-based control systems, etc.) and/or components (e.g., controllers, PLCs, modules, etc.) and one or more PLC interfaces350that facilitate data exchange with I/O, tags, memory, etc. of an industrial controller, PLC, module, etc. Examples of suitable protocols include CIP, fieldbus, TCP, IP, NetBEUI, FTP, HTTP, etc.

As depicted, the arbitration component310communicates with a controller360and one or more applications370. The controller360includes a data region380and one or more control applications390. The arbitration component310can utilize the one or more PLC interfaces350to read and/or write parameters in the data region380. Such parameters can include I/O, status, and/or state data, for example. In addition, the arbitration component310can utilize the one or more industrial protocols340to exchange data with the control applications390of the controller360. The control applications390can be programmed in essentially any programming language. Examples of suitable languages include industrial control languages (e.g., structured text (ST), sequential function chart (SFC), functional block diagram (FBD), instruction list (IL), and ladder diagram (LD)), C, C++, C#, Graphical Motion Language (GML), Java, Flow-Charts, etc., and/or any combination thereof. Moreover, the arbitration component310can utilize the one or more industrial protocols340to exchange electronic data with the applications370, which can include essentially any application residing outside of the controller360.

As described herein, the data communicated with the arbitration component310can be associated with electronic data obtained from a reader (e.g., RFID), a server, an RFID tag, or other component, wherein the electronic data can include EPC data (e.g., EPC code, logical reader, timestamp, signal quality indicator, various flags, etc.), product type, date of manufacture, lot number, and/or associated cases, pallets, and/or container levels, for example. The arbitration component310is depicted as an individual component within the system300; however, it is to be appreciated that the arbitration component310can execute within the controller360and/or other entity of an industrial system. In addition, the arbitration component310can execute within a personal computer, a laptop, a human interface machine, a handheld computer, a workstation, an agent, a hardware module, a software module, firmware, a state machine, a microprocessor, a PDA, a smart phone, a mobile phone, etc. Moreover, the arbitration component310can be distributed and/or execute across industrial systems in a distributed environment.

In one aspect of the invention, the arbitration component310exchanges data with the controller360and/or applications370based on a subscription and/or query. For example, the controller360and/or any of the applications370can employ a Subscribe Interaction Protocol (e.g., FIPA, ACS/JDL, etc.) to subscribe to the arbitration component310to receive electronic data when such data arrives, a signal quality indicator associated with received electronic data, and/or other environmental information. The signal quality indicator and/or the other environmental information can be utilized to resolve the source of the electronic data (e.g., an RFID tag) and the location thereof. In another example, the controller360and/or applications370can request (e.g., query) the arbitration component310for historical information such as electronic data read within a particular time period (e.g., between timestamps), signal quality indicators read within a particular time period (e.g., between timestamps), timestamps corresponding to particular electronic data, signal quality indicators corresponding to a particular electronic data, etc. Such data can be provided by the arbitration component310to a subscriber(s) and/or requestor(s) as a list of records as described in detail below.

FIG. 4illustrates a system400, which is an alternative configuration of the system300. In system300, the processing module320and the industrial control interface330execute within the arbitration component310, whereas in the system400the processing module320and the industrial control interface330execute within the controller360. In another configuration (not shown), the arbitration component310can execute within the controller360.

FIG. 5illustrates an industrial control system500. The system500includes a plurality of readers505that receive electronic data (e.g., EPC data) from RFID tags within one or more antenna range coverage areas of the readers505. The readers505can convey the electronic data to one or more servers510, which can filter, process and/or store the data and/or a reader interface515of a processing module520. The electronic data can be received by the reader interface515through an RFID Reader Driver Plug-in. It is to be appreciated that the reader interface515can employ one or more plug-ins (e.g., RFID Reader Driver Plug-ins) to facilitate communication with various readers. For example, each of the readers505can be associated with a plug-in and associated protocol, which can correspond to a manufacturer or vendor of the reader, the reader model, the reader software revision, etc. The reader interface515can utilize various communication channels such as Ethernet, serial port, Firewire, USB, parallel port, etc. in connection with suitable communication protocols (e.g., generic and reader dependent protocols). Electronic data from the one or more servers510can be received by a server interface525of a processing module520. As noted above, the electronic data can obtained from an RFID tag. Such tags can be formed from a chip (e.g., silicon, germanium, etc.) and one or more antennas, encoded with product related data, and affixed to a product.

The processing module520further includes a filter and processing component530that can be utilized to process raw electronic data received through the reader interface515and/or the sever interface525. The filter and processing component530can be utilized to discriminate between electronic data, for example, to recognize and store particular data, while discarding other data. Typically, electronic data received through the server interface525is processed and does not require further filtering and/or processing; however, such data may be unprocessed or additional filtering and/or processing may be desired. The filter and processing component530can convey the data to a storage component535, which can include local and/or remote volatile and/or non-volatile memory.

An application interface540of the processing component520can be utilized to transfer electronic data stored in the storage component535through an industrial control interface545to an industrial control system550. For example, a control application can of the industrial system550can subscribe to receive electronic data whenever an RFID tag enters and/or leaves a coverage area of the readers505. In another example, the control application can query, or request, electronic data. In one instance, such request can be for historical electronic product data. For example, the historical data can be related to unique codes and/or a signal quality indicator read within a specific period of time and/or timestamps and/or signal quality indicators corresponding to particular electronic data. This information can be conveyed to the control application of the industrial system550as a list of records or other format. In addition, PLC plug-ins555and/or industrial protocols560can be employed to facilitate communication with the industrial control system550.

FIG. 6illustrates an industrial control system600that collects electronic data from RFID tags, stores the data within a table, and distributes the data to industrial systems. The system600includes a plurality of RFID readers605and a plurality of server610that provides electronic data to a processing module615. In general, the electronic data obtained from the plurality of readers605is received by a reader interface620of the processing module615, and electronic data from the server610is received by a server interface625of the processing module615. The electronic data can be processed and/or raw data and communicated through various communication channels and protocols as described herein. Received electronic data is conveyed by the reader interface620and/or the server interface625to a filter and processing component630, wherein the data can be filtered and/or processed, if desired, for example, to selectively accept data and format raw data.

The electronic data is conveyed by the filter and processing component630to a storage component635, which is depicted as a two dimensional table. However, it is to be appreciated that this example is illustrative and not limitative, and that essentially any technique for storing data can be employed in accordance with aspects of the invention. For example, the table can be a database of records (e.g., records within a table, in-memory database and a simple DB system). In addition, essentially any number of rows and columns can be utilized to store the data, and the table can be one, two, three, four, . . . , N dimensional, wherein N is an integer equal to or greater than one. As depicted, the storage component635includes a plurality of columns640and a plurality of rows645in which electronic data is stored. In this particular example, the columns640are utilized to store EPC codes, logical reader identifiers (e.g., denoting the logical reader coverage area where the EPC data was acquired), time stamps, and flags that indicate whether a RFID tag is within a coverage area of a reader, respectively. The flag can be set based on incoming EPC (e.g., a sequence of EPC data periodically emitted by an RFID tag) data and/or by a transmitting reader (e.g., one of the readers605), the server610and/or a photo-eye. It is to be understood that the columns640could be utilized to store more or less, and/or different information.

Respective rows645are associated with individual EPC codes. By way of example, a first row650includes an EPC code 110 . . . 0011, an associated logical reader identifier LR1, a timestamp of 12:35:00:00, and an “IN” flag that denotes the RFID tag entered the coverage area of the readers605; a second row655includes an EPC code 101 . . . 1101, an associated logical reader identifier LR2, a timestamp of 12:35:05:30, and an “IN” flag that denotes the RFID tag entered the coverage area of the readers605; and a third row660includes an EPC code 110 . . . 1010, an associated logical reader identifier LR2, a timestamp of 12:35:45:20, and an “OUT” flag that denotes the RFID tag left the coverage area of the readers605. As described in detail below, a logical reader can be defined by one or more physical readers and associated antennas. The electronic data stored in the storage component635can be conveyed through an application interface665to an industrial control interface670, which facilitates distributing the electronic data, via one or more PLC interfaces680and/or one or more industrial protocols690, to one or more industrial systems695.

FIG. 7illustrates a system700that receives electronic data from various RFID readers and servers and provides the data to one or more industrial systems. The system700includes a physical RFID reader702and a physical RFID reader704. However, it is to be understood that essentially any number of readers can be employed in accordance with the invention. The physical RFID readers702and704can individually be associated with one or more antennas, which can be respectively directed at an area in which to read data. In this example, the physical RFID reader702is associated with an antenna706, and the physical RFID reader704is associated with an antenna708and an antenna710. A logical RFID reader712can be formed from the physical RFID reader704and the antenna706, and a logical RFID reader714can be formed by from the physical RFID reader704and the antennas708and710. A reading from antenna706can be represented as a reading from the logical RFID reader712, and a reading from antenna708and/or710can be represented as a reading from the logical RFID reader714.

The system700further includes a server716that stores electronic product data. The electronic data stored within the server716can be uploaded and/or downloaded from a user and/or programmer's interface (not shown) and/or from the readers702and704. Typically, electronic data received from the readers702and704is raw data, which can be filtered and processed within the server716before, during and/or after saving the electronic data. The electronic data within the server716can be stored as records within a database or other formats, for example, binary and ASCII. The electronic data read by the readers702and704and/or stored in the server716can be conveyed to a processing module718for storage and distribution to an industrial system(s)720. The processing module718can include a reader interface722that can accept electronic data from the readers702and704as described herein. The processing module718further includes a server interface724that accepts electronic data from the server716as described herein. The server interface716can include interfaces to Savant-like servers.

The processing module718further includes a filter and processing component726that can filter electronic data to discriminate between electronic data and format the data. Suitable filtering includes recognizing and filtering duplicate readings. For example, when an RFID tag enters a range of one of the antennas706,708and710, the corresponding physical RFID reader (physical RFID reader702or physical RFID reader704) periodically reads electronic data transmitted from the RFID tag and sends it to the processing module718. In many instances, the reader reads duplicate electronic data emitted by the RFID tag. For example, the reader702can read the same EPC code multiple times per second. In another example, two RFID tags can be within the range of the antenna706. In this instance, the reader702can read duplicate data from both RFID tags (e.g., EPC1, EPC2, EPC1, EPC1, EPC2. . . ). Suitable filtering can recognize and discriminate between the two RFID tags. For example, the filtering can recognize that two tags with different electronic data entered the reader at a particular time and consider the mapping between physical and logical readers. The filter and processing component726can convey the electronic data to a storage component728, and stored electronic data can be distributed to the industrial systems720through an application interface730and an industrial control interface732via various PLC interfaces734and/or industrial protocols736, as described herein.

The following discussion provides two specific examples that further explain possible mappings between physical and logical RFID readers. It is to be appreciated that these examples are illustrative and do not limit the invention. A first example depicts a conveyor belt system with a physical reader738coupled to a plurality of antennas740,742,744and746. The system further includes a logical reader748formed from the antennas740and742, and a logical reader750formed from the antennas744and746. The antenna740, for example, can read a tag752, a tag754, or both tags752and754and, simultaneously, the antenna742can read the tag754, the tag752, or both tags752and754. A filtration module (e.g., the filter and processing component726) can determine the tags752and754have been read by the logical reader748. Likewise, the antenna744can read a tag756, a tag758, or both tags756and758and, simultaneously, the antenna746can read the tag758, the tag756, or both tags756and758. The filtration module can determine the tags756and758have been read by the logical reader750. A second example depicts a location such as a dock door, wherein a single logical reader760is formed from a physical reader762and associated antennas764,766,768and770and a physical reader772and associated antennas774,776,778and780. Utilizing several antennas can ensue that all tags going through the dock door (e.g., on pallets on a track) will be read. Some tags will be read by the antennas764,766,768and770(e.g., tags closer to these antennas), and some tags will be read by the antennas774,776,778and780(e.g., tags closer to these antennas). However, all tags go through the same area and, thus, belong to the same logical reader760.

FIG. 8illustrates a system800that employs intelligence to facilitate distribution of electronic data to industrial control systems. The system800includes an arbitration component810that collects, filters, and/or processes the electronic data via a processing module820and/or distributes the data to an industrial control system(s)830through various PLC interfaces840and/or industrial protocols850of an industrial control interface860. The system800further includes an intelligent component870that facilitates collecting, filtering, processing and/or distributing data. For example, a plurality of RFID readers880can be associated with coverage areas, wherein individual readers can scan and read electronic data from one or more RFID tags within their respective coverage areas. Such data can be conveyed to the arbitration component810. The intelligent component870can facilitate recognizing data (e.g., as raw or processed data, the logical reader coverage area, the physical reader . . . ) and directing it to the appropriate reader interface (not shown). Similarly, the intelligent component870can facilitate recognizing electronic data received from a server890and directing it to an appropriate server interface (not shown).

Upon receiving electronic data at an interface, the intelligent component870can facilitate determining whether the data should be filtered and/or formatted. Such filtering can include saving electronic data deemed to be desired and discarding remaining electronic data. The intelligent component870can then be utilized to facilitate storing the electronic data. For example, the intelligent component870can parse the electronic data and store respective portions within different fields. In one instance, such fields can be associated with a database table as described herein. The intelligent component870can facilitate conveying the stored electronic data to the industrial system(s)830as described herein. Such conveyance can be in accordance with agent subscriptions and/or queries, wherein the electronic data is provided to the industrial system(s)830based on a corresponding subscription or query.

FIG. 9illustrates an industrial controller900in accordance with an aspect of the invention. The industrial device900can be an industrial controller, a programmable logic controller (PLC), and the like. As such, the industrial controller900can comprise one or more modules such as a processing module910, a memory module920, and an I/O module930, and a power component940to energize components therein. The processing module910can be utilized to execute control applications, end-user programs and associated instructions, which can be stored within the memory module920or memory external to the industrial controller900. The I/O module930provides communication with the environment. For example, an input channel can be employed to receive analog and digital signals through sensors, switches and the like to provide information indicative of state and/or relating to a process, whereas an output channel can be utilized to convey a next state to an entity under the control of the controller. The controller900further includes a control object950, which can includes a processing module (not shown) and an industrial control interface (not shown), to facilitate the exchange of electronic data obtained from RFID tags (not shown) and the controller900, as well as other industrial control components (not shown), as described herein.

FIGS. 10-13illustrate methodologies, in accordance with an aspect of the present invention. While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the present invention is not limited by the order of acts, as some acts can, in accordance with the present invention, occur in different orders and/or concurrently with other acts from that shown and described herein. For example, those skilled in the art will understand and appreciate that one or more of the methodologies could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement the methodologies in accordance with the present invention.

FIG. 10illustrates a method1000for distributing electronic data received from RFID readers to entities of industrial control systems. At1010, electronic data (e.g., unprocessed and processed) from one or more RFID tags is received. The electronic data can be indicative of an EPC code, a logical reader, a timestamp, a signal quality indicator, a flag indicating whether an RFID tag is within a coverage area, a product type, a date of manufacture, a lot number, case information, pallet information, and/or container levels information, for example. In addition, the electronic data can be provided by an RFID reader that scanned the RFID tag. Such readers typically are associated with logical reader, wherein individual readers can employ one or more antennas to scan one or more RFID tags. In addition, one or more readers can scan similar and/or different coverage areas and, thus, more than one reader can obtain data from a single RFID tag. The electronic data from the reader can be received by one or more reader interfaces, for example, an RFID reader plug-in associated with the manufacturer of the reader. Typically, conveyance of the electronic data is through an Ethernet connection utilizing a communication protocol supported by the reader manufacturer.

At1020, the electronic data is filtered. Such filtering includes recognizing and filtering duplicate readings. For example, when an RFID tag enters a range of an antenna of a reader, the reader begins to periodically read the electronic data from the RFID tag and send the read data. In many instances, the reader reads duplicate electronic data emitted by the RFID tag (e.g., the same EPC code, for example, 100 readings of the same EPC per second). In another example, two RFID tags can be within the range of the antenna. In this instance, the reader can read duplicate data from both RFID tags (e.g., EPC1, EPC2, EPC1, EPC1, EPC2. . . ). The filtering can recognize that two tags with different electronic data entered the reader at a particular time and consider the mapping between physical and logical readers. At reference numeral1030, the electronic data is processed. Such processing includes formatting the electronic data for subsequent storage, recognizing electronic product data of interest, etc. At1040, the electronic data is stored. In one instance, the electronic data is stored as records in a table, wherein individual rows are utilized to delineate related electronic data across fields, or columns. In one particular example, individual fields can store an EPC code, a logical reader identifier, a timestamp, a flag that indicates whether a RFID tag is within a coverage area, etc.

At reference numeral1050, stored electronic data is provided to one or more components of the industrial control system. Conveyance of such data can be in response to a subscription (e.g., a Subscribe Interaction Protocol) by the component to receive electronic data information and/or signal quality information whenever an RFID tag enters a coverage area. In another instance, one or more of the components can automatically receive such information. In yet another example, intelligence can be employed to determine when or if received and/or stored electronic data should be conveyed to the component. In still another example, conveyance can be in response to a request for historical information.

FIG. 11illustrates a method1100for distributing electronic data obtained from a server to components within an industrial control system. At reference numeral1110, electronic data from a server is received. For example, a server interface can be provided to receive EPC and/or other electronic data from an associated server. Typically, such data is formatted and stored, for example, within records of a database associated with the server. In these instances, the formatted data, or records, can be conveyed to the server interface. Typically, the data is conveyed through an Ethernet connection utilizing a communication protocol supported by the server. However, it is to be appreciated that any wire and/or wireless connection can be utilized in accordance with aspects of the invention.

At1120, the electronic data can be stored. If desired, prior to storage the data can be filtered and/or processed. However, data received from a server typically has been filtered and processed and, thus, additional filtering and processing may or may not be desired. In one example, the data is stored as records in a table. As such, individual rows can include one or more fields that store particular portions of the data. For example, individual fields can store an EPC code, a logical reader identifier, a timestamp, a flag that indicates whether a RFID tag is within an antenna's coverage area, etc. At reference numeral1130, stored data can be provided to one or more components of the industrial control system. Conveyance of such data can be in response to a subscription and/or query.

FIG. 12illustrates a method1200that provides electronic data to components in an industrial control system. At reference numeral1210, one or more components subscribe to receive electronic data when an RFID tag enters a coverage area. At1220, electronic data received from a reader and/or a server. At1230, the electronic data is filtered, processed and/or stored as described herein. At1240, the electronic data is provided to subscribed component.FIG. 13illustrates a method1300for a component of an industrial system to retrieve electronic product data. At reference numeral1310, one or more components issue a query for electronic data. The query can be a request for historical data from a database. For example, the query can be to get all data read within a particular time period (e.g., between two timestamps). In another example, the query can be for a list of timestamps corresponding to particular electronic data. At1320, the data can be retrieved, and at1330, the requested data is provided to the requesting component.

In order to provide a context for the various aspects of the invention,FIGS. 14 and 15as well as the following discussion are intended to provide a brief, general description of a suitable computing environment in which the various aspects of the present invention can be implemented. While the invention has been described above in the general context of computer-executable instructions of a computer program that runs on a computer and/or computers, those skilled in the art will recognize that the invention also can be implemented in combination with other program modules. Generally, program modules include routines, programs, components, data structures, etc. that perform particular tasks and/or implement particular abstract data types. Moreover, those skilled in the art will appreciate that the inventive methods may be practiced with other computer system configurations, including single-processor or multiprocessor computer systems, mini-computing devices, mainframe computers, as well as personal computers, hand-held computing devices, microprocessor-based or programmable consumer electronics, and the like. The illustrated aspects of the invention may also be practiced in distributed computing environments where task are performed by remote processing devices that are linked through a communications network. However, some, if not all aspects of the invention can be practiced on stand-alone computers. In a distributed computing environment, program modules may be located in both local and remote memory storage devices.

With reference toFIG. 14, an exemplary environment1410for implementing various aspects of the invention includes a computer1412. The computer1412includes a processing unit1414, a system memory1416, and a system bus1418. The system bus1418couples system components including, but not limited to, the system memory1416to the processing unit1414. The processing unit1414can be any of various available processors. Dual microprocessors and other multiprocessor architectures also can be employed as the processing unit1414.

The system memory1416includes volatile memory1420and nonvolatile memory1422. The basic input/output system (BIOS), containing the basic routines to transfer information between elements within the computer1412, such as during start-up, is stored in nonvolatile memory1422. By way of illustration, and not limitation, nonvolatile memory1422can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM), or flash memory. Volatile memory1420includes random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in many forms such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).

It is to be appreciated thatFIG. 14describes software that acts as an intermediary between users and the basic computer resources described in suitable operating environment1410. Such software includes an operating system1428. Operating system1428, which can be stored on disk storage1424, acts to control and allocate resources of the computer system1412. System applications1430take advantage of the management of resources by operating system1428through program modules1432and program data1434stored either in system memory1416or on disk storage1424. It is to be appreciated that the present invention can be implemented with various operating systems or combinations of operating systems.

A user enters commands or information into the computer1412through input device(s)1436. Input devices1436include, but are not limited to, a pointing device such as a mouse, trackball, stylus, touch pad, keyboard, microphone, joystick, game pad, satellite dish, scanner, TV tuner card, digital camera, digital video camera, web camera, and the like. These and other input devices connect to the processing unit1414through the system bus1418via interface port(s)1438. Interface port(s)1438include, for example, a serial port, a parallel port, a game port, and a universal serial bus (USB). Output device(s)1440use some of the same type of ports as input device(s)1436. Thus, for example, a USB port may be used to provide input to computer1412and to output information from computer1412to an output device1440. Output adapter1442is provided to illustrate that there are some output devices1440like monitors, speakers, and printers, among other output devices1440, which require special adapters. The output adapters1442include, by way of illustration and not limitation, video and sound cards that provide a means of connection between the output device1440and the system bus1418. It should be noted that other devices and/or systems of devices provide both input and output capabilities such as remote computer(s)1444.

Computer1412can operate in a networked environment using logical connections to one or more remote computers, such as remote computer(s)1444. The remote computer(s)1444can be a personal computer, a server, a router, a network PC, a workstation, a microprocessor based appliance, a peer device or other common network node and the like, and typically includes many or all of the elements described relative to computer1412. For purposes of brevity, only a memory storage device1446is illustrated with remote computer(s)1444. Remote computer(s)1444is logically connected to computer1412through a network interface1448and then physically connected via communication connection1450. Network interface1448encompasses communication networks such as local-area networks (LAN) and wide-area networks (WAN). LAN technologies include Fiber Distributed Data Interface (FDDI), Copper Distributed Data Interface (CDDI), Ethernet/IEEE-1102.3, Token Ring/IEEE-1102.5 and the like. WAN technologies include, but are not limited to, point-to-point links, circuit switching networks like Integrated Services Digital Networks (ISDN) and variations thereon, packet switching networks, and Digital Subscriber Lines (DSL).

Communication connection(s)1450refers to the hardware/software employed to connect the network interface1448to the bus1418. While communication connection1450is shown for illustrative clarity inside computer1412, it can also be external to computer1412. The hardware/software necessary for connection to the network interface1448includes, for exemplary purposes only, internal and external technologies such as, modems including regular telephone grade modems, cable modems and DSL modems, ISDN adapters, and Ethernet cards.

FIG. 15is a schematic block diagram of a sample-computing environment1500with which the present invention can interact. The system1500includes one or more client(s)1510. The client(s)1510can be hardware and/or software (e.g., threads, processes, computing devices). The system1500also includes one or more server(s)1530. The server(s)1530can also be hardware and/or software (e.g., threads, processes, computing devices). The servers1530can house threads to perform transformations by employing the present invention, for example. One possible communication between a client1510and a server1530can be in the form of a data packet adapted to be transmitted between two or more computer processes. The system1500includes a communication framework1550that can be employed to facilitate communications between the client(s)1510and the server(s)1530. The client(s)1510are operably connected to one or more client data store(s)1560that can be employed to store information local to the client(s)1510. Similarly, the server(s)1530are operably connected to one or more server data store(s)1540that can be employed to store information local to the servers1530.