JP2002245417A - Production managing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production managing device capable of surely preventing interference and competition because of having a small number of frequencies used for a carrier signal. SOLUTION: A plurality of antennas 3 for transmitting a frequency signal (carrier signal) of the same frequency are installed in each of a plurality of production lines (conveyor) 10, and a personal computer 8 that manages attributes of a product selects only one among the plurality of antennas 3 and decides the transmission and reception permission of the frequency signal with a tag 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless individual recognition device (tag) attached to a carrier (a container such as a container) for storing products conveyed by a conveyor or the like of a plurality of production lines. The present invention relates to a production management device for writing or reading attributes of a product using an antenna.

[0002]

2. Description of the Related Art In general, products (including products, semi-finished products, and parts) conveyed by a conveyor on a production line are stored and conveyed in a box (conveyor) such as a container. A wireless individual recognition device called an ID tag is attached to the carrier so that the attribute of the product can be understood.

[0003] Writing and reading of attribute data are performed on an individual recognition device (ID tag) by an antenna. The attribute data includes a product name, a maker code, a production lot number, a production date, and the like. The attributes of the products on the production line are imported to a computer and managed.

The combination of such an individual recognition device and an antenna is well known as RF-ID (Radio Frequeney ID) technology. Writing and reading to and from the individual recognition device are performed by irradiating a frequency signal (carrier signal) from an antenna. In particular, in recent years, battery-less tags for supplying electric power by transmitting a high-frequency carrier signal as a radio wave from an antenna have been put to practical use. An RF-ID technology using a batteryless tag is described in, for example, Japanese Patent Application Laid-Open No. 11-184986.

[0005] Conventionally, an antenna is an irradiating radio wave (carrier signal).
Due to the directivity of the antenna, another antenna is not installed in the communication area of one antenna to avoid mutual interference and competition.

However, when a plurality of production lines are arranged side by side, antennas have to be installed close to each other due to facility layout, and another antenna must be installed within the communication area of one antenna. ing.

When a plurality of production lines are arranged side by side as described above, in order to prevent interference and competition in which a tag receives a carrier signal emitted from a plurality of antennas, a carrier signal of a different frequency is applied to each antenna. It is assigned.

[0008]

In the prior art, a carrier signal of a different frequency is assigned to each antenna. However, one production line has many processes, and an antenna is installed for each process. Therefore, there is a problem that the number of frequencies to be used is increased and management thereof is difficult, and it is extremely troublesome to add an antenna or change an installation position.

For this reason, the number of frequencies used for carrier signals is small, and there is a strong demand for the development of a technique for reliably preventing interference and contention.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a production management apparatus which uses a small number of frequencies for a carrier signal and can reliably prevent interference and contention. To provide.

[0011]

A feature of the present invention is that a plurality of antennas for transmitting a frequency signal (carrier signal) of the same frequency are installed for each of a plurality of production lines,
A digital computing device such as a personal computer for managing the attributes of a product selects only one of a plurality of antennas and determines whether to permit transmission and reception of a frequency signal.

In other words, the present invention instructs a controller to select only one of a plurality of antennas and write or read attribute data of a product by a host computer managing a plurality of production lines. It was made.

According to the present invention, a plurality of antennas for transmitting a frequency signal (carrier signal) of the same frequency are installed for each of a plurality of production lines, and only one of the plurality of antennas is selected by a host computer to permit transmission / reception. Since the determination is made, the number of frequencies used for the carrier signal is small, and interference and contention can be reliably prevented.

[0014]

FIG. 1 shows an embodiment of the present invention.
FIG. 1 shows the overall configuration of the present invention.

In FIG. 1, a transport body 1 containing a product is placed and transported on a conveyor 10 composed of rollers or belts. The transport body 1 is a box body such as a container, and a plurality of conveyors 10 are arranged side by side to form a plurality of transport lines. One transport line includes, for example, a washing process, a finishing process, a packaging process, and the like. An individual recognition device (TAG) 2 storing attribute data of a product is attached to the carrier 1.

An antenna 3 is installed at a predetermined position on a conveyor 10 constituting a transport line. The antenna 3 writes and reads attribute data to and from the TAG 2 wirelessly without contact. TAG when 4 lines are used
The relationship between 2 and the antenna 3 is as shown in FIG.

A stopper 11 is provided on the conveyor 10 as a stopping device for temporarily stopping the carrier 1 at a set position (fixed position).
Is provided. The stopper 11 is installed so as to protrude or be buried from the conveyor 10. FIG. 1 shows a state in which the stopper 11 is projected and the transport body 1 is temporarily stopped. When the carrier 1 is temporarily stopped at the set position, the antenna 3 and the TAG 2 face each other.

The stop of the carrier 1 at the fixed position is detected by a carrier sensor (position sensor) 5. Antenna 3
The transmission and reception of the carrier signal are controlled by the controller 4. That is, the controller 4 controls writing and reading of attribute data to and from the TAG 2 of the antenna 3.
When there are four transport lines, the controller 4 controls the antennas 3 (3-1, 3-2, 3-3, 3-3) as shown in FIG.
4) It is provided for each.

The four controllers 4 (4-1, 4-2,
4-3, 4-4) are the antennas 3 (3-1, 3-2, 3-3, 3-) according to a command from a higher-level personal computer (PC) 8 as a digital processing device for management.
The transmission and reception of 4) is controlled. The personal computer PC 8 is connected to the network 9 and can use the antenna management data of the antenna management file 13. Usually, a plurality of management personal computers are connected to the network 9 and share the antenna management file 13.

FIG. 2 shows a personal computer PC8, a controller 4,
An example detailed functional block diagram of the antenna 3 and the TAG 2 is shown.

In FIG. 2, when the carrier 1 stops at a fixed position (set position), it is detected by a carrier sensor (position sensor) 5 and a carrier detection signal is transmitted to a fixed position detector 801 of the personal computer PC8. Upon input of the carrier detection signal, fixed position detection section 801 causes transmission permission determination section 802 to determine whether transmission of a carrier wave (permission of transmission / reception) in antenna 3 provided on conveyor 10 is permitted.

The transmission permission determining unit 802 refers to the antenna management data stored in the antenna management file 13 to determine whether the antenna 3 can transmit. When the transmission permission determining unit 802 determines that the antenna 3 can transmit, the in-use antenna setting unit 805 updates the antenna management data stored in the antenna management file 13 as the in-use antenna.

When the transmission permission determination section 802 is in a state in which the antenna management file 13 cannot be permitted, the transmission permission determination is made again after a predetermined time set by the re-permission determination waiting timer section 803.

If the transmission permission determining unit 802 determines that the antenna 3 is capable of transmitting, the antenna use setting unit 805 determines that the management data of the antenna management file 13 is in use, and then reads / writes the determination unit 806. , The process branches to a writing process to the TAG2 and a reading process. The read / write determination unit 806 determines a write process and a read process depending on where on the production line (conveyor 10) the antenna 3 is installed. The installation position data of the antenna 3 is stored in the antenna management file 13.

When the antenna 3 is writing, the writing data editing unit 820 fetches the writing data in the writing data file 821 and sends it to the writing instruction unit 821. The writing instruction unit 821 is provided by the antenna control unit 4 of the controller 4.
1 and the write data together with the write command. Upon receiving the write command and the write data, the antenna controller 41 sends a carrier signal to the carrier irradiator 31 of the antenna 3 via the transmitter 42. The carrier irradiator 31 of the antenna 3 irradiates the TAG 2 with the carrier.

When the receiving section 21 of the TAG 2 receives the carrier, it extracts data from the carrier and stores it in the data storage section 22. The TAG 2 sends a carrier wave of a storage completion report from the transmission unit 23 when the data storage in the data storage unit 22 is completed normally.

The carrier receiving section 32 of the antenna 3 has a tag 2
And transmits the received signal to the antenna controller 41 via the receiver 43 of the controller 4. Antenna control unit 4
1 decodes the signal from the TAG 2 as a storage completion report, and transmits it to the write result confirmation unit 822 of the personal computer PC 8 as a write OK or write NG result report.

The write result confirmation unit 822 confirms this result, releases the stopper 11 of the conveyor 10 by the stopper release unit 823, and restarts the transfer of the carrier 1 on which the TAG writing has been completed. Further, the antenna use release unit 824 releases the data of the antenna management file 13 during use of the antenna.

On the other hand, at the time of reading, the read / write judging section 806
A read processing instruction is input to the read instruction unit 807.
The read instruction unit 807 transmits a read command to the antenna control unit 41 of the controller 4. The antenna control section 41 interprets the read command and outputs a carrier wave irradiation command from the transmission section 42 to the carrier wave irradiation section 31 of the antenna 3. TAG2 receiving unit 2
1 receives a carrier and interprets a read instruction from the carrier to extract data from the data storage unit 22 and transmit it from the transmission unit 23.

The carrier receiving section 32 of the antenna 3 has a tag 2
And sends it to the receiving section 43 of the controller 4. The receiving unit 43 sends the received signal to the antenna control unit 41, where the signal from the TAG2 is decoded and transmitted as data to the read data extracting unit 808 of the personal computer PC8.

The read data fetching unit 808 sends the received data to the read data storage unit 809, and reads the received data.
Stored at 10. Also, the read data extracting unit 808 sends a stopper release command to the stopper release unit 823,
Then, the conveyance of the carrier 1 having completed the reading of 2 is restarted, and a command to cancel the in-use of the antenna is given to the in-use antenna canceling unit 824 to cancel the in-use of the antenna in the antenna management file 13.

FIG. 3 shows the first antenna 3-1 and TAG2-1.
Of the second antenna 3-2, the TAG 2-2, the controller 4-2, the third antenna 3-3, the controller 4-3, the TAG 2
3 is a configuration example of a conveyer line including a fourth antenna 3-4, the same TAG 2-4, and a controller 4-4.

These processes are independent of the unit of the controller 4 connected to the personal computer PC 8, that is, the unit of the antenna 3 installed at each reading point.

Since they are independent, the carrier 1 may naturally arrive at each reading point at the same time. At this time, if radio waves of the same carrier frequency channel are simultaneously emitted, radio interference occurs, and reading / writing to the TAG 2 cannot be performed.
In order to prevent this, at least the antennas 2 having the same carrier frequency are managed as one group, and the antenna management file 13 is used.

FIG. 4 shows an example of the structure of the antenna management data stored in the antenna management file 13. The antenna management data in FIG. 4 is an example of registration of eight antennas 2.

The record structure of the antenna management data includes an antenna name 1301 serving as a key for a record search, a PC name 1302 to which the antenna 3 is connected, a connection port name 1303 of the PC 8 to which the controller 4 of the antenna 3 is connected, and an antenna. 3 carrier frequency channels 1
304, a group of antennas 1305, and a transmitting flag 1306 dynamically updated at the read / write timing of TAG2.

The table of the antenna management data shown in FIG. 4 needs to have only one transmission and emission of the carrier wave in consideration of the position and orientation of the antenna 3 actually installed at the time of creation, and the directivity of the carrier wave to be irradiated. Some antennas, that is, antennas that should not emit radio waves at the same time, are assigned as a group. When the antennas 3 are arranged in the directivity direction of the antenna 3 as shown in FIG. 3, these antennas 3 are set as the same group.

In addition, even if the antenna 3 has the same carrier frequency channel, there may be a wall that blocks radio waves, a case where the antenna 3 is sufficiently far away, or a case where a different floor is installed.
If it is not necessary to take exclusive transmission of irradiation between the antennas, they are registered as different management groups in the antenna management information (data). This antenna management information is used to uniquely identify the antenna that can transmit radio waves within the same antenna group.

Next, the operation will be described with reference to the flowcharts of the personal computer PC8 shown in FIGS.

First, the writing process will be described with reference to the flowchart of FIG.

The carrier sensor 5 monitors whether the carrier 1 to which the TAG 2 has been attached has stopped at a fixed position (set position). When the transport body 1 is transported and stops at a fixed position by the stopper 11, the transport body sensor 5 detects the transport body 1.
The fixed position detection unit 801 receives the carrier detection signal from the carrier sensor 5 in step W01, and detects that the carrier 1 has stopped at the fixed position.

When the process proceeds from step W01 to step W02, the transmission permission determining unit 802 performs a transmission permission determination process. In step W02, the antenna management file 13
To extract information on all the antennas of the group to which the antenna 3 belongs. The transmission permission determining unit 802 determines in step W03 whether the transmitting antenna 3 exists in the same group as the transmitting flag 13.
06, and if none of the antennas 3 is transmitting, transmission is permitted for the antenna 3 concerned.

On the other hand, any of the antennas 3 in the group
Is being transmitted, the process proceeds to step W04, and after a predetermined time by the re-permission determination waiting timer unit 803, step W04 is performed again.
Returning to step 02, an antenna management information extraction process is performed.

If the transmission permission determining unit 802 permits transmission of any of the antennas 3 in the same group in step W03 while not transmitting, the in-use antenna setting unit 805 determines in step W05 that the antenna in the antenna management file 13 The transmitting flag 1306 of the antenna 3 in the management information is processed as 1 (transmitting).

The read / write determination unit 806 executes a determination process for branching the read / write process in step W06. As described above, the read / write determination unit 806 determines the write process and the read process (read process) based on where the antenna 3 is installed on the production line (conveyor 10). The write data editing unit 820 fetches data from the write data file 821 in step W07 and edits the write data in TAG2. The write instruction and the write data edited by the write data editing unit 820 are transmitted from the write instruction unit 821 to the controller 4 in step W08.

When the personal computer PC8 transmits the write instruction and the write data to the controller 4 in this manner, it waits for a response from the controller 4. When the writing to TAG2 is completed, the writing result confirmation unit 822 of the personal computer PC8
Inputs the writing result of TAG2 from the antenna control unit 41 in step W09.

When the writing is confirmed by the writing result confirming unit 822, the stopper releasing unit 823 releases the stopper 11 and restarts the transport of the transport body 1 in step W10. The antenna use canceling unit 824 cancels the use of the antenna in the antenna management file 13 (step 13).
06 is set to 0), and the writing process ends.

Next, the reading process will be described with reference to FIG. How the antenna management information is used is the same as the writing process in FIG.

The carrier sensor 5 monitors whether the carrier 1 to which the TAG 2 has been attached has stopped at a fixed position (set position). When the transport body 1 is transported and stops at a fixed position by the stopper 11, the transport body sensor 5 detects the transport body 1.
The fixed position detection unit 801 receives the carrier detection signal from the carrier sensor 5 in step R01, and detects that the carrier 1 has stopped at the fixed position.

When the process proceeds from step R01 to step R02, the transmission permission determination unit 802 executes a transmission permission determination process. In step R02, the antenna management file 13
To extract information on all the antennas of the group to which the antenna 3 belongs. The transmission permission determining unit 802 determines in step R03 whether the transmitting antenna 3 exists in the same group as the transmitting flag 13.
06, and if none of the antennas 3 is transmitting, transmission is permitted for the antenna 3 concerned.

On the other hand, any of the antennas 3 in the group
If the call is being transmitted, the process proceeds to step R04, and after a certain period of time by the re-permission determination waiting timer unit 803, the process returns to step R04.
Returning to step 02, an antenna management information extraction process is performed.

If the transmission permission determination unit 802 permits transmission of any of the antennas 3 in the same group in step R03 while not transmitting, the in-use antenna setting unit 805 determines in step R05 that the antenna in the antenna management file 13 The transmitting flag 1306 of the antenna 3 in the management information is processed as 1 (transmitting).

The read / write determination unit 806 executes a determination process for branching the read / write process in step R06. As described above, the read / write determination unit 806 determines the write process and the read process (read process) based on where the antenna 3 is installed on the production line (conveyor 10). The read instruction unit 807 sends a read instruction command to the controller 4 when the process proceeds to step R07.

When the personal computer PC8 transmits the read instruction command to the controller 4 in this way, it waits for a response from the controller 4. When the reading of the attribute data from the TAG 2 is completed, the read data extracting unit 8 of the personal computer PC 8
A step 08 waits for a response from the controller 4 in a step R08, and executes a process of extracting the read data.

The read data (attribute data) extracted by the read data extracting unit 808 is stored in the read data storage unit 810 by the read data storage unit 809 in step R09. Also, the read data extracting unit 808 determines in step R08
When the reading is confirmed, the stopper release unit 823 sets the step R
At 10, the stopper 11 is released and the conveyance of the conveyance body 1 is restarted. The antenna use canceling unit 824 cancels the use of the antenna in the antenna management file 13 (sets the transmitting flag 1306 to 0) in step R11, and ends the reading process.

FIG. 7 shows an example of TAG2 data (attribute data). FIG. 7 shows a TAG format of a usage example in which the actual time when a carrier with a TAG passes through each step of the metal process → painting process → paint inspection process is recorded in the TAG. As described above, in a production management site using a TAG, the read / write points for the TAG are generally at a plurality of locations, so that the effectiveness of the present invention can be understood.

As described above, the production control is performed by writing and reading the attribute data of the product stored in the carrier. A frequency signal (carrier signal) of the same frequency is transmitted for each of a plurality of production lines. Since a plurality of antennas for transmitting are installed, and only one of the plurality of antennas is selected by the host computer and transmission / reception is determined, the number of frequencies used for the carrier signal is small,
Interference and competition can be reliably prevented.

Since the hardware of the controller and the antenna is optimized for the carrier frequency to be used, if a large number of carrier frequency channels are used, it is necessary to prepare a spare part for replacement in the event of a failure. There was,
The present invention also has a practical effect of requiring only a minimum number of spare parts.

Further, there is an effect that adjustment such as selection of the frequency of the antenna is not required when the installation position of the antenna is changed or added.

In the above-described embodiment, a controller is provided for each antenna. However, it is apparent that a single controller may be used for control.

[0061]

According to the present invention, a plurality of antennas for transmitting the same frequency signal (carrier signal) are installed for each of a plurality of production lines, and only one of the plurality of antennas is selected and transmitted / received by a host computer. Since the permission is determined, the number of frequencies used for the carrier signal is small, and interference and contention can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention.

FIG. 2 is a detailed structural view of a main part of an embodiment of the present invention.

FIG. 3 is a diagram showing a device arrangement for explaining the present invention.

FIG. 4 is a diagram illustrating an example of antenna management information.

FIG. 5 is a flowchart for explaining the operation of the present invention.

FIG. 6 is a flowchart for explaining the operation of the present invention.

FIG. 7 is a diagram illustrating an example of tag information (attribute data).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Carrier, 2 ... Wireless individual recognition device (TAG), 3 ...
Antenna, 4 ... Controller, 5 ... Carrier sensor, 8 ...
Personal computer conveyor, 9 ... network,
10: conveyor, 11: stopper, 13: antenna management file.

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3C100 AA21 CC14 DD07 DD12 DD14 DD17 DD22 DD32 5B058 CA15 CA23 YA01 5J021 AA04 AA05 AA06 CA06 DB04 FA00 FA13 FA30 JA00 JA03

Claims (10)

[Claims] 1. A plurality of antennas installed for each of a plurality of production lines for transmitting frequency signals of the same frequency, a controller for controlling transmission and reception of the plurality of antennas, A wireless individual recognition device relating to an attribute of the product, which is attached to a carrier to which the production line is transported, and which responds to a frequency signal of the antenna installed on the transported production line; and A digital operation device for selecting only one device, determining permission of transmission / reception of a frequency signal, and instructing the controller. 2. A plurality of antennas installed at predetermined positions predetermined for a plurality of production lines and transmitting frequency signals of the same frequency, a controller controlling transmission and reception of the plurality of antennas, and A wireless individual recognition device having the attribute data of the product, which is attached to a carrier that is housed and transports the plurality of production lines, respectively, and that responds to a frequency signal of the antenna installed on the transported production line; A digital operation device for selecting only one of the plurality of antennas, determining permission of transmission / reception of a frequency signal, and instructing the controller. 3. A plurality of antennas installed at predetermined positions for a plurality of production lines for transmitting carrier signals of the same frequency, a controller for controlling transmission and reception of the plurality of antennas, and The plurality of production lines are attached to a carrier to be transported and the plurality of production lines are respectively transported, and the attribute data of the product is written or opposed to the antenna installed on the production line transported when the transport is temporarily stopped or A production system comprising: a wireless individual recognition device for performing reading; and a digital operation device for selecting only one of the plurality of antennas, determining permission of transmission / reception of a frequency signal, and instructing the controller. Management device. 4. A plurality of antennas installed at predetermined positions predetermined for each of a plurality of production lines, transmitting a carrier signal of the same frequency for writing or reading according to the installation position, and writing or reading the plurality of antennas. A controller that controls reading and is attached to a transporter that stores products and transports the plurality of production lines, and faces the antenna that is installed on the production line that is transported when the transporter is temporarily stopped. A wireless individual recognition device for writing or reading the attribute data of the product, and when the carrier stops at a set position, selects only one of the plurality of antennas and outputs the attribute data of the product. A digital operation device for instructing the controller to perform writing or reading. 5. A plurality of antennas installed at predetermined positions for a plurality of production lines and transmitting carrier signals of the same frequency, a controller for controlling writing or reading of said plurality of antennas, Writing the attribute data of the product in a state where the product is attached to a carrier that is transported through each of the plurality of production lines and is conveyed when the carrier is stopped; Alternatively, a wireless individual recognition device that performs reading, a stopping device that stops the carrier at a set position, and when the carrier stops at a set position, selects only one of the plurality of antennas to produce the product. A computer for instructing the controller to write or read the attribute data. 6. A plurality of antennas installed at predetermined positions predetermined for each of a plurality of production lines, transmitting a carrier signal of the same frequency for writing or reading according to the installation position, and writing or reading the plurality of antennas. A plurality of controllers each for controlling reading, and the antenna mounted on a production line which accommodates a product and is conveyed through the plurality of production lines and conveyed when the conveyance body is stopped. A wireless individual recognition device for writing or reading attribute data of the product in opposition to the device, a stopping device for stopping the carrier at a set position, and the plurality of devices when the carrier stops at a set position. A computer for selecting only one of the antennas and instructing the controller for controlling the selected antenna. Production management apparatus according to claim. 7. A plurality of antennas installed at predetermined positions predetermined for a plurality of production lines and transmitting carrier signals of the same frequency, and a plurality of antennas for controlling writing or reading of the plurality of antennas, respectively. A controller, which is attached to a carrier that stores the product and is transported through each of the plurality of production lines, and faces the antenna that is installed on the production line that is transported when the transport is stopped. A wireless individual recognition device for writing or reading attribute data, a stopping device for stopping the carrier at a set position, and a plurality of the plurality of antennas depending on a transmission / reception state of the plurality of antennas when the carrier stops at a set position. Of the selected antennas, and instructs the controller for controlling writing or reading of the selected antenna. Production control apparatus characterized by comprising a chromatography data. 8. A plurality of antennas installed for each of a plurality of production lines for transmitting frequency signals of the same frequency, a controller for controlling transmission and reception of said plurality of antennas, A wireless individual recognition device for storing attribute data of the product in response to a frequency signal of the antenna installed on the transported production line, each of which is attached to a transporter transported on the production line; and A stopping device for stopping at a set position, and when the carrier stops at the set position, the controller selects only one of the plurality of antennas based on a transmission / reception state of the plurality of antennas, determines permission for transmission / reception of a frequency signal, and And a digital operation device for instructing the production control device. 9. A plurality of antennas installed at predetermined positions of respective conveyors constituting a plurality of production lines and transmitting a carrier signal of the same frequency, and writing or reading of each of the plurality of antennas is performed. A plurality of controllers to be controlled, and a plurality of conveyors, each of which accommodates a product, is attached to a carrier that is transported, and is opposed to the antenna installed on the conveyor that is transported when the transporter is temporarily stopped. A wireless tag for writing or reading attribute data of the product, a stop device for temporarily stopping the carrier at a set position, and a transmission / reception state of the plurality of antennas when the carrier is temporarily stopped at the set position. Selects only one of the plurality of antennas, and controls the writing or reading of the selected antenna. Production control apparatus characterized by comprising a personal computer that instructs the controller. 10. A plurality of antennas installed at predetermined positions predetermined for a plurality of production lines and transmitting frequency signals of the same frequency, a controller for controlling transmission and reception of the plurality of antennas, and Storing a carrier that is stored and transported through the plurality of production lines, respectively, and attribute data of the product that is attached to the transporter and that responds to a frequency signal of the antenna that is installed on the transported production line. A production management device comprising: a wireless individual recognition device; and a personal computer which selects only one of the plurality of antennas, determines permission of transmission / reception of a frequency signal, and instructs the controller.