JP2003067683A - Recognition system in production line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out a highly reliable recognition processing without taking costs even for a production line including a process of bad conditions. SOLUTION: The same information is written to all of a plurality of RF tags 1 and the RF tags 1 are attached to a palette 4 for carrying articles through a supporting holder 6a and carried together with the articles. An antenna 2 successively communicates with the respective RF tags 1, reads the information inside a memory and outputs it to a controller and the controller transmits the information to host equipment further. The host equipment compares the information read from the respective RF tags 1 with each other, and in the case that the majority of the information match, judges that the matching information is appropriate and specifies it as a recognition object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for managing information relating to processing for automating a production line consisting of a plurality of processes, and particularly in a production line including processes with bad environment such as high temperature. Related to technology for recognizing proper information.

[0002]

2. Description of the Related Art In an automatic assembly line such as an automobile factory,
A storage medium that contains information that indicates the type of product or product, the content of work to instruct the robot, etc. is attached to the parts or intermediate products to be transferred, or a pallet for these transfers, and each process is executed Before doing so, the information is read from the storage medium and recognized, the operator is instructed, and an assembly machine such as a robot is operated.

Particularly, as a storage medium of this type, a medium having a semiconductor memory, a coil for transmission and reception, etc. built therein is called an RF tag, and an antenna (read / write antenna) or a controller for communicating with the RF tag is used. The deployed system is an RFID system (Radio Frequency
Identification System) is called. This R
In the FID system, in each process, not only information is read from the RF tag, but also additional information can be written and information can be rewritten for the following process. It is possible to manufacture multiple types of products while changing options.

By the way, if the assembly line has a process such as a painting process which is carried out in a high temperature environment, the cells in the memory of the RF tag are deteriorated and data is garbled, or the main body of the RF tag and the circuit are damaged. Defects such as breakage may occur, causing problems in the processing of the following steps. Regarding this problem, a method of temporarily removing the RF tag when entering a high temperature environment has been proposed. For example, the actual Kaihei 5-8644
According to Japanese Patent Laid-Open No. 9, a device for removing the RF tag is installed upstream of the high temperature environment, and a device for attaching the RF tag is installed downstream thereof to prevent the RF tag from being exposed to high temperature.

[0005]

However, if the above-mentioned devices for removal and attachment are installed, a great cost is required and it is necessary to secure a space for installing these devices. In addition, since the mounting position of the RF tag is limited depending on the relationship with these devices, R
It may be difficult to attach the F tag. Further, if the device fails or wears and the RF tag cannot be removed or installed, the original purpose may not be achieved.

On the other hand, a heat insulating material is used for the case body,
An RF tag that is resistant to a high temperature environment can be manufactured by using a heat resistant component. However, such an RF tag is high in cost and is not suitable for an assembly line for carrying a large number of parts. It is also possible to replace the RF tag regularly, but it is impossible to clarify the time when the RF tag becomes defective, and the new RF tag
Since there is a good possibility that defects will occur even in tags, RF
There is a problem that it is not possible to adequately deal with defective tags. In addition, in a line such as an automobile assembly line where coating is first performed and then an assembly process is started, the RFID system may be defective by introducing the RFID system only in a range that avoids the first half portion that becomes a high temperature environment. Can be prevented. However, in such a method, it is impossible to consistently manage the work from the start to the end, and there is a problem that the production efficiency is significantly reduced.

The present invention has been made by paying attention to the above-mentioned problems, and a highly reliable recognition process can be executed without cost even for a production line including a process under adverse conditions such as a high temperature environment. The first purpose is to improve the production efficiency of the line. In addition, a second object of the present invention is to quickly detect and replace a defect in an RF tag used for this type of recognition processing.

[0008]

The present invention is directed to a system for recognizing information relating to an article conveyed to the production line in a production line consisting of a plurality of steps. A plurality of RF tags attached to a pallet for transportation, a communication device for reading information held by each RF tag as a recognition target by communication with the RF tag, and a read from each RF tag by the communication device. And a control device that identifies the information to be recognized from the obtained information.

The "article" means a part or an intermediate processed product for making a final product. The RF tag includes a semiconductor memory (hereinafter simply referred to as "memory") such as EEPROM or FeRAM, and a circuit for performing communication by radio waves or electromagnetic waves.
In this memory, as the "information relating to the conveyed article", in addition to the information for specifying the type of the article and the processing content, the final type of the product, the color, the type of the installed option, etc. You can write Further, when the inspection is performed in the middle of the process, model data indicating a non-defective product, determination criteria, and the like can be stored as the “information related to the conveyed product” to be recognized. In addition,
The memory area for storing such information is normally set to be rewritable, and new information may be added or rewritten in the middle of the line. Further, in the memory, a check code for discriminating the adequacy of the information to be subjected to the above-mentioned recognition processing, and R
Unique identification information (such as an ID number) can be stored in the F tag.

If each of the RF tags is attached to a pallet for transporting articles via a support holder,
The work can be completed by simply removing the article from the pallet when the work based on the information written in the RF tag is completed. In addition, if the mounting position of the support holder on the pallet can be adjusted, it can be adjusted according to the purpose of the work, the facility environment of the process to be performed, the type and size of the article, etc.
The attachment position of the RF tag can be easily changed.

The communication device corresponds to the read / write antenna, and the control device corresponds to the controller. The communication device is preferably arranged before or in the vicinity of each process of the production line, and can be set to perform communication with the RF tag sequentially or simultaneously. On the other hand, the control device can be provided for each process similarly to the communication device, but the received information of a plurality of communication devices can be
It is also possible to take it in the control device of the table and process it.
It is also possible to integrate the communication device and the control device. The control device may be provided with means for reading information from each RF tag through the communication device and identifying the contents thereof, and may be provided with means for writing new information in the RF tag or rewriting existing information. .

It is preferable that the controller is connected to a higher-level device such as a programmable controller or a personal computer, and transmits the information specified as the recognition target to these higher-level devices. In this case, the controller and the higher-level device are used. Can be the control device. Further, the host device may be provided with means for controlling the operation of various drive systems such as a robot and an inspection device that compose the production line in accordance with the recognized information, so that the assembly process and inspection of the product can be automated.

In the present invention, at the time when the transportation of the article is started, the same information is written as the information to be recognized in the plurality of RF tags transported together with the article. , Each R above
When there is a difference in the information read from the F tag, the most information is determined to be proper information and specified as the information to be recognized.

In recent years, some inexpensive RF tags have a quality capable of keeping the probability of occurrence of a defect due to adverse conditions to about several percent.
When transported with F-tags, the likelihood that most of these RF tags will fail at once can be minimized. Moreover, it can be said that the possibility that similar abnormal data is generated due to defects in all RF tags is extremely rare. When such a condition is ensured, when the same information is written as a recognition target in each RF tag at the start of conveyance and then read from each RF tag in the middle of the production line, each data is the same. If so, it can be safely determined that this information is correct. In addition, even when the information read from each RF tag does not match, the principle of majority vote can determine the most information as appropriate information.

According to the present invention, in view of the above points, when the information read out from the RF tag in which the same information is written at the start of conveyance in the control device does not match, the most information is appropriate. Since it is specified as the information to be recognized, even if some of the RF tags have a defect due to bad conditions such as high temperature, it is necessary to read and identify appropriate information from the RF tag that does not have the remaining defect. As a result, even after a process under adverse conditions, the process can proceed smoothly to the next process. Therefore, by adopting an inexpensive RF tag that can secure a certain level of quality, highly reliable identification processing can be performed at low cost, the production line can be operated efficiently, and the product as designed can be accurately manufactured. Can be assembled.

Further, according to the present invention, the same information is written as the recognition target in a plurality of RF tags conveyed together with the article at the time when the article is started to be conveyed, and the suitability of the information is determined. The check code is set so that the control device determines whether the information read from each RF tag is appropriate by using the check code, and the information determined to be appropriate is used as the recognition target information. Can also be specified as

The check code is a numerical value obtained by applying information of each area in the memory, such as a parity code, a BCC code, and a CRC code, to a predetermined arithmetic expression and executing it. The control device executes the arithmetic expression from the information read from each RF tag and compares the result with the stored check code,
The suitability of information can be determined. According to this configuration, even if a large number of RF tags are defective under the process of adverse conditions, the information of the RF tag holding the remaining proper information can be recognized and the next process can be performed. ,
The production line can be operated more efficiently.

Further, in the present invention, the communication device is provided at least before and after the predetermined process, and in the control device, for each RF tag, before and after the process by each communication device. The information read out is compared, and the information read out from the RF tag in which the information before and after the step is matched is determined to be proper information and specified as the information to be recognized. You can also

The "predetermined process" is preferably a process under adverse conditions such as a high temperature environment. Information read from each RF tag before executing the process under adverse conditions and after completion of the process. By comparing the read information for each RF tag, R
The F tag can be identified. (However, with respect to the information read out before the step, it is necessary to make an appropriateness determination in advance and only the information determined to be appropriate is to be compared.) In the above configuration, before and after the step. Since the information from the RF tag with which the information matches is determined to be proper information and specified as the information to be recognized, it is assumed that most RF
Even if a defect occurs in the tag, the process can be performed using the RF tag having the remaining proper information.

Further, in any of the above-mentioned three types of systems, the R tag of the RF tag holding the information that is not specified as the recognition target is given to the control device.
An output unit that outputs information for identifying the F tag can be provided. The output unit can be configured as a unit that outputs the identification information of the RF tag to a peripheral device such as a monitor. As a result, the user can identify the defective RF tag, and can take a measure such as replacing the RF tag with a new one when the necessary process is completed, and the reliability of the identification process. It is possible to promptly deal with the occurrence of defects while maintaining the above.

[0021]

1 and 2 show a schematic configuration of an RFID system to which the present invention is applied. This RF
The ID system is for efficiently operating a production line such as an automobile assembly line (hereinafter simply referred to as “line”) by managing information relating to a series of assembly operations. , Read / write antenna 2 (hereinafter simply referred to as "antenna 2"),
Also, the controller 3 has a basic configuration, and the host device 5 is connected to the controller 3.

The RF tag 1 is attached to a pallet 4 for transportation, which will be described later, and is transported along a line together with the articles in the pallet 4. Inside the memory 11, information for recognition is stored. Besides, a coil 12 for transmission / reception, a demodulation circuit 13 for data reception, a modulation circuit 14 for data transmission, a power supply generation circuit 15, and a control circuit 16
And so on. The antenna 2 is for reading and writing information with respect to the RF tag 1, and internally,
A modulation circuit 23 for transmitting data and commands, a demodulation circuit 24 for receiving data, a control circuit 25, etc. are incorporated. The controller 3 is connected to the antenna 2 and the host device 5 by a cable, and in addition to the control circuit 31, the interface circuits 32 and 33 (lower I / F circuit in the figure) corresponding to the antenna 2 and the host device 5, respectively. 32, upper I /
Shown as an F circuit 33. ) Is incorporated.

In the above structure, the antenna 2 transmits commands and information to the RF tag 1 in response to a command from the controller 3, and in response to this transmission, the RF tag 1
The information returned from is fetched and output to the controller 3. The host device 5 is composed of a personal computer, a programmable controller and the like. These host devices 5 are for controlling the operation of a robot for assembling processing, an inspection device for an intermediate processed product, etc., and take in and recognize the information read from the RF tag 1 by the antenna 2 and the controller 3, It is set to execute various controls.

The RF tag 1 of this embodiment is of a type that does not have a built-in battery, and the RF tag 1 is driven by the antenna 2 transmitting radio waves including supplied power together with commands and information. There is. RF tag 1
The power supply generation circuit 15 therein is for converting the induced electromotive force generated in the coil 12 by the transmission wave from the antenna 2 into a direct current, and the control circuit 16 has the power supply generation circuit 1
Upon receiving the power supply from the device 5, processing for reading information from the memory 11 and transmitting information to the antenna 2 is executed.
However, the RF tag 1 is not limited to the type without a built-in battery, and it is also possible to use the type with a built-in battery.

FIG. 3 shows an example of data contents stored in the RF tag 1. The memory of this RF tag 1 is 12
It has a capacity of 8 bytes, and in addition to the ID number unique to the RF tag 1 (hereinafter referred to as "tag ID"), production instruction data, quality data, preliminary data, and check code information, A fixed-length storage area is set for each. Note that the tag ID is written in the manufacturing process of the RF tag 1 and is set as information that can only be read. However, other information can be read and appropriately rewritten by the user. .

The production instruction data is information indicating what kind of processing is to be performed depending on the conveyed article, and includes information such as the type of product in the final form, color, and options to be installed in the product. The quality data is used when an inspection is performed in the middle of a line and includes non-defective product data and inspection determination criteria. The host device 5 specifies a program and setting data required for processing based on these pieces of information, and then drives a robot, an inspection device, etc. based on the specified program and setting data. In this way, by sequentially performing the processing corresponding to each information in each process on the line, a product corresponding to the model indicated in the production instruction data and satisfying the quality indicated in the quality data is finally manufactured. Will be done.

Information for supplementing the production instruction data and the quality data is written in the storage area of the preliminary data, and information generated by the processing in the line (for example, the result of the inspection) is written. You can
The check code is code information such as a parity code, a BCC code, and a CRC code, and stores the result of arithmetic processing by regarding each piece of information of the production instruction data, quality data, and spare data as a series of data strings. To be done.

In this embodiment, a plurality of Rs are provided on one pallet 4 in order to cope with a process under adverse conditions such as a high temperature environment.
The F tag 1 is attached, and the same information is written in each RF tag 1 except the tag ID, and the RF tag 1 is conveyed. Further, when performing each step, in the host device 5, each RF is set by the antenna 2 and the controller 3.
After the proper information is specified from the information read from the tag 1, the information determined to be proper is subjected to information processing.

FIG. 4 shows an example of a method of mounting the RF tag 1 and communicating with the antenna 2. A plurality of (three in the illustrated example) RF tags are provided on the surface 4A of the pallet 4 facing the antenna 2. Support holder 6a in which 1s are arranged in a row
The RF tags 1 are attached so that the arrangement direction of the RF tags 1 is along the moving direction F of the pallet 4. In this arrangement, each R
Each R so that the F tag 1 enters the communication area of the antenna 2 in order.
The interval between the F tags 1 is adjusted so that a FIFO (first in first out) communication is performed.

FIG. 5 shows another example of attachment of the RF tag 1 and a communication method. In this example, each RF tag 1 is attached to an antenna 2 by attaching a support holder 6b in which four RF tags 1 are arranged in the vertical direction and two in the horizontal direction to the pallet 4.
It is put in the communication area at the same time to perform multi-method communication (simultaneous communication).

In each of the examples shown in FIGS.
Each RF tag 1 is fitted and fixed in holes (not shown) formed in the support surfaces of the support holders 6a and 6b, and can be easily attached and detached by applying a pressing force from the front side or the back side. Therefore, if a defect occurs in the RF tag 1, the RF tag 1 can be easily replaced with a new one. In addition, the support holders 6a and 6b
Are detachably attached to the pallet 4 by engaging members (not shown). Further, the support holders 6a and 6b can be attached to each surface of the pallet 4, and the attachment positions can be slid so that the attachment positions can be changed according to the installation conditions of the line. it can.

Further, even when it is necessary to change the pallet 4 to a different size, it is sufficient to remove each RF tag 1 together with the support holder and attach it to the other pallet 4, so that the RF tag 1 can be replaced or replaced. The replacement work can be easily performed. In addition, like the car body,
For articles that cannot be stored in the pallet 4, a dedicated support holder may be created and a plurality of RF tags may be attached in the same manner.

FIG. 6 shows a processing procedure when the recognition processing is performed in the host device 5 while discriminating appropriate information. In this example, the information read from each RF tag 1 is compared with each other, and if there is a difference in each information, the most information is determined to be proper information and the information is specified as a recognition target. It was done. First, in ST (step) 1, information is read from each RF tag 1 attached to the pallet 4 via the controller 3 and the antenna 2. Either of the above-mentioned FIFO method and multi-method may be used to read this information.

In the next step ST2, the read information is compared with each other. It should be noted that all of the information shown in FIG. 3 except for the tag ID is to be compared here. If it is recognized in ST2 that all the information matches, the determination in ST3 becomes "YES" and the process proceeds to ST4, in which the information common to the RF tags 1 is determined to be proper, and the recognition process using the information is performed. Run.

On the other hand, if the information read from each RF tag 1 is inconsistent, the determination in ST3 is "NO" and the process proceeds to ST5. In this ST5, it is checked whether more than half of the information matches, and if this determination is “YES”, the process proceeds to ST6 where it is determined that the information in which more than half of the information match is proper. A recognition process for this information is executed. Further, in the next ST7, regarding the information which is not determined to be appropriate, the tag ID of the RF tag 1 holding the information is used as the information indicating the defective RF tag 1 (hereinafter, referred to as “defective information”) and the like. Output to.

When the determination in ST5 is "NO", that is, when the information of more than half of the RF tags 1 does not match, ST is determined.
Proceed to step 8, and tag I of all RF tags 1 as defect information.
Output D.

According to the above procedure, if the memory of some of the RF tags 1 is defective in the previous step, S
Even if the information read out at T1 does not match, if the majority of the information matches, the matched information is regarded as appropriate and the process proceeds.

Assuming that the RF tag 1 is of a quality such that the probability of occurrence of defects due to adverse conditions is within a few percent, 3 to 4 RF tags as shown in FIGS. More than half of RF when using 1
The possibility that a defect will occur in the tag 1 is extremely small.
Therefore, even if some of the RF tags 1 are defective due to adverse conditions, the processing can be advanced using the information read from other normal RF tags 1 by the processing of ST6 and ST7, and the line The processing can be continued without stopping.

For example, model V7 manufactured by OMRON Corporation
The 00-D13P31 RF tag guarantees operation at 180 degrees Celsius, is excellent in water resistance and chemical resistance, and can be provided at a low price (standard price is 980 yen). With such an RF tag, even if a plurality of RF tags are used for each pallet 4, there is no risk that the introduction cost will rise. Therefore, highly reliable recognition processing can be performed without cost.
It is possible to assemble the product as designed.

Further, in the above embodiment, since the tag ID of the RF tag 1 having the mismatch information is output as the defect information, a series of assembling processing is completed and the pallet 4 is completed.
When collecting, the defective RF tag 1 can be removed and replaced with a new RF tag 1, and the RF tag 1 can be efficiently replaced. (If a dedicated device for exchanging the RF tag 1 is prepared, the replacement of the RF tag 1 can be automated by the control of the host device 5 and the like. Further, based on the defect information, the defective RF is detected. (For example, the map information indicating the tag 1 may be displayed to support the manual replacement work.)

In the procedure of FIG. 6, the most data is judged to be proper, but instead of this,
The check code may be used to determine the suitability of the data. FIG. 7 shows a procedure of the higher-level device 5 when the suitability judgment is made by the check code. Note that the procedure of FIG. 7 is executed instead of the procedure of FIG. 6, but here, in order to avoid confusion, the steps of each process are indicated by the symbols after ST11.

First, in ST11, ST1 of FIG.
Similarly, after reading the information from each RF tag 1, the suitability of the check code is checked in next ST12.
In this ST12, the calculation formula of the check code is executed for all the information except the tag ID for each RF tag 1, and the obtained calculation result is collated with the read check code.

When it is determined that the check codes of all the RF tags 1 are proper by the above processing, the process proceeds from ST13 to ST14, the information read from each RF tag 1 is determined to be proper, and the recognition processing is executed. . In this case,
Since the information of each RF tag 1 should match, the information of any one of the RF tags 1 may be used as a representative to perform the recognition process for that information. On the other hand, if it is determined that there is an incorrect check code, ST13 to ST15
Then, the recognition process is performed for the information of the RF tag 1 for which an appropriate check code is obtained. Next ST1
In the case of 6, RF tag 1 with an incorrect check code
The tag ID of is output as defect information.

According to the procedure shown in FIG. 7, the suitability of the information read from each RF tag 1 is determined by the check code. Therefore, even if a majority of RF tags 1 are defective, the remaining defects are generated. The information from the non-existing RF tag 1 can be regarded as appropriate and the processing can be advanced, and the line can be operated more efficiently.

The host device 5 does not necessarily have to be provided for each process, and a plurality of processes can be managed by one host device 5. Therefore, as shown in FIG. 8, the information read before performing the process under adverse conditions (shown as point A in the figure) and before performing the next process (in the diagram,
Shown as point B. ) Is taken into the same higher-level device 5 and the RF
Appropriate information can be determined by comparing the information before and after the bad condition process for each tag 1.

FIG. 9 shows a processing procedure of the host device 5 when the processing of FIG. 8 is applied. Note that, in FIG. 9, the steps of each process are indicated by the symbols after ST21 in order to avoid confusion with the procedures of FIGS.

In the procedure of FIG. 9, the pallet 4 is the same as that shown in FIG.
It is executed when it is transported to the point B. Prior to the processing of FIG. 9, the suitability of the information read from each RF tag 1 at the point A is determined by the procedure of FIG. 6 or FIG. 7. In FIG. 9, the information at the point A is correct. Only the RF tag 1 that is determined to be processed is to be processed. However, here, in order to simplify the explanation, at point A,
It is assumed that the information from all the RF tags 1 has been judged to be appropriate.

First, in ST21, the information from each RF tag 1 is read out, and then in ST22, the information is compared with the information obtained at the point A for each RF tag 1. Here, if the information of the point A and the point B of all the RF tags 1 match, the determination in ST23 becomes “YES” and the process proceeds to ST24, where the information read from each RF tag 1 is determined to be proper, A recognition process for the information is executed.

On the other hand, for any RF tag 1, A
When the information different from the information obtained at the point is read out, the determination in ST23 is “NO” and the process proceeds to ST25, the same information as the point A is determined to be appropriate, and this information is targeted. The recognition process is performed. Further ST26
Then, the tag ID of the RF tag 1 for which information different from the point A is obtained is output as defect information.

In the procedure of FIG. 9 described above, as in the previous embodiment, even if some RF tags 1 are defective in the bad condition process,
The information read from another normal RF tag 1 can be used to proceed to the next step, and it is possible to prevent a line from being stagnant and a product different from the specification from being assembled due to incorrect information. Further, since the information read before and after the bad condition process is collated for each RF tag 1, even if a majority of the RF tags 1 are destroyed under bad conditions, the information from the remaining RF tags 1 is used for processing. Can be promoted and the operating efficiency of the line can be improved.

In each of the processes shown in FIGS. 6, 7 and 9, the suitability of the information of each RF tag 1 is determined by the higher-level equipment 5, but the present invention is not limited to this, and the controller 3 side The suitability may be determined, and the information determined to be suitable may be transmitted to the higher-level device 5 side.

[0052]

According to the present invention, the same information is written as the information to be recognized in a plurality of RF tags, the information is conveyed along with the article on the production line, and proper information is discriminated from the information read from each RF tag. Since it is specified as the information to be recognized, by adopting an inexpensive RF tag that can secure a certain level of quality, highly reliable recognition processing can be performed without cost, and the production line You can operate it efficiently and assemble the product exactly as designed.

Further, according to the present invention, the suitability of the information of each RF tag is determined by using a check code, and the information read from each RF tag before and after the bad condition process is compared for each RF tag, thereby making it appropriate. R that holds various information
Since the F tag is discriminated, even if many RF tags are defective in the bad condition process, the next process can be advanced by using the information from the remaining RF tags, and the production line can be further improved. It can be operated efficiently.

Further, according to the present invention, since the information for identifying the RF tag which is not determined to be proper is output, the RF tag having the defect can be promptly detected and replaced based on the output information, It is possible to efficiently replace the RF tag. RF where a defect has occurred
Since the replacement is performed only for the tags, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of an RFID system to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of an RFID system.

FIG. 3 is an explanatory diagram showing an example of information stored in a memory of an RF tag.

FIG. 4 is an explanatory diagram showing an example of attachment of an RF tag.

FIG. 5 is an explanatory diagram showing an attachment example of an RF tag.

FIG. 6 is a flowchart showing a processing procedure in a host device.

FIG. 7 is a flowchart showing a processing procedure in a host device.

FIG. 8 is an explanatory diagram showing a third method for determining the suitability of the information of the RF tag.

9 is a flowchart showing a processing procedure of a host device when the method of FIG. 8 is carried out.

[Explanation of symbols] 1 RF tag 2 read / write antenna 3 controller 4 pallets 5 Host device 6a, 6b support holder 11 memory

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Claims (5)

[Claims] 1. A system for recognizing information related to an article conveyed to the production line in a production line including a plurality of steps, the plurality being attached to the article or a pallet for conveying the article. Of the RF tag, a communication device for reading information held by each RF tag as a recognition target by communication with the RF tag, and information of a recognition target from the information read from each RF tag by the communication device. A control device for specifying is included, and when the transportation of the article is started, the same information is written as the recognition target information in a plurality of RF tags that are transported together with the article, and the control is performed. When there is a difference in the information read from each of the RF tags, the device determines that the most information is appropriate information and regards it as the recognition target information. Identification system on the specified production line. 2. A system for recognizing information related to an article conveyed to the production line in a production line including a plurality of steps, the plurality being attached to the article or a pallet for conveying the article. Of the RF tag, a communication device for reading information held by each RF tag as a recognition target by communication with the RF tag, and information of a recognition target from the information read from each RF tag by the communication device. A control device for specifying the information is included, and at the time when the transportation of the article is started, the same information as the information of the recognition target is determined for each of the plurality of RF tags transported together with the article, and the suitability of the information is determined. And a check code for checking whether the information read from each RF tag is proper or not. A recognition system in a production line that identifies information that has been determined to be appropriate as the information to be recognized by using. 3. A system for recognizing information relating to an article conveyed to the production line in a production line including a plurality of steps, the plurality being attached to the article or a pallet for conveying the article. Of the RF tag, a communication device for reading information held by each RF tag as a recognition target by communication with the RF tag, and information of a recognition target from the information read from each RF tag by the communication device. A control device for specifying is included, and at the time when the transportation of the article is started, the same information is written as the information to be recognized in a plurality of RF tags transported together with the article, at least The communication device is provided before and after a predetermined step, and the control device controls the RF tag for each RF tag. The information read by the communication device before and after the process is compared, and the information read from the RF tag in which the information before and after the process matches is determined to be proper information and the recognition is performed. A recognition system on the production line that specifies the target information. 4. The control device comprises output means for outputting information for identifying an RF tag that holds information that has not been specified as the information to be recognized, for the RF tag. The recognition system in the production line described in any of. 5. The RF tags are attached to a pallet for transporting articles via a support holder.
The recognition system in the production line described in any one of 3 above.