JPH04163604A - Production control system - Google Patents

Abstract

PURPOSE:To improve productivity in a production line by transferring information concerning a material to be worked (body) from one storing medium (ID plate) to another ID plate without stopping the production line. CONSTITUTION:Respective bodies B are placed on automatic carrier trucks 12 and the automatic carrier trucks 12 shift the bodies B along the line. Various information are written in the ID plates 20 set in the center parts of the side surfaces of the automatic carrier trucks 12 by a micro wave generated from antennas ANT. Written ID information can be read out through the antennas ANT. ID information is transferred without stopping the production line from the ID plates 20 set in the automatic carrier devices 12 which are circulating in a pre-process line to the ID plates 20 set in the automatic carrier devices 12 which are circulating in a post-process line. Thus, machine kinds etc., are not erroneously judged and productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a production management system suitable for use in, for example, an automobile production line that produces a mixture of different models.

"Prior Art" In a production line or the like, processing machines are placed at predetermined positions and perform various processing on workpieces moving along the line. By the way, like a car production line,
When producing different types of cars on the same line, each processing machine must perform processing according to the type of car. For this reason, the operator inputs instruction data indicating the vehicle type, etc., to each processing machine. This instruction data includes vehicle type, 2
It includes various data indicating whether the vehicle is a door or four-door vehicle, whether options are installed, etc. The judgment at this time was made by the operator visually observing an identification card or the like attached to the vehicle.

On the other hand, when the instruction data is input, the processing machine creates a code for determining an operation using an internally stored conversion table, and performs processing according to this code. For example, in a processing machine that automatically attaches windows, a code is created according to the vehicle model based on the instruction data, and based on this code, a window suitable for the vehicle model, etc. is taken out from the mounting location, and the window corresponding to the vehicle body is removed. Attach to position.

However, the conventional production line described above has the following problems.

■The operator visually identifies the vehicle type, etc., so
Misjudgment may occur. In addition, it took time to correct mistakes caused by misjudgment, resulting in a decrease in productivity.

- Operators had to input instruction data manually, which was time-consuming and reduced productivity.

■Since each processing machine had its own conversion table, if there was a change in car model, etc., the conversion table for each processing machine had to be corrected, which was complicated.

In order to solve these problems, the applicant has developed a production control system.

The production management system includes a host computer that outputs an identification take for identifying products, a plurality of processing machines that are placed at predetermined positions on the production line and perform processing according to the action instruction take, and and a text file storing a correspondence relationship between the identification data and the identification data,
a data conversion means for creating an operation instruction take from identification data by referring to the text file; a storage medium attached to a conveyance means on which a workpiece moving along a production line is placed; and the conversion means. and data writing means for writing the operation instruction take created by the processing machine into the storage medium of the corresponding workpiece, and each of the processing machines performs processing based on the operation instruction take read from the workpiece. This is a characteristic feature.

"Invention or Problem to be Solved" By the way, in cases where there are multiple production lines, it may be necessary to transfer the workpieces (such as wood chips) from one production line to the next. Here, the conveyance means to which the storage medium is attached is configured to circulate through each production line, so when the workpiece is transferred to the next production line, information about the workpiece is also collected. Is there a need to transport it?

That is, it is necessary to write information regarding the transferred workpieces to the storage medium of the transfer means in the input section of the next production line.

It is conceivable to have the host computer perform this writing, but this poses a problem in that it is difficult to match the timing of transferring the workpiece with the timing of writing the information. This means that the host computer must recognize the workpiece in the delivery section of the previous production line, and then perform a write operation in synchronization with the transfer timing of the workpiece. This is because the processing becomes complicated. If the writing timing is off, there will be a mismatch between the information and the workpiece.
Subsequent processing will be performed on a completely different model.

The above-mentioned problem becomes even more pronounced when there is an intermediate transport means before the next production line. This is because the workpiece must be transferred from the previous production line to the intermediate transfer device and then transferred to the next production line, which makes the process of tracking information even more complicated.

This invention was made in view of the above-mentioned circumstances, and even when the workpiece is transferred to the next production line,
The purpose of this invention is to provide a production control system that can accurately track information regarding the workpiece.

"Means for Solving the Problem" The invention as set forth in claim 1 includes a plurality of production lines, transporting workpieces from the input section to the delivery section of each production line, and transporting the workpieces after sending out the workpieces. has a conveying means that moves to the input section again and circulates through the production line,
A production management system in which a storage medium for storing information regarding the workpiece is provided in the transport means, wherein when the transport means to which the workpiece has been transferred reaches a delivery section of one production line, the transport means A reading device for reading the information from a storage medium provided in the storage device, a storage device for storing the information read by the reading device, and a storage device provided in the transportation device in another production line. a writing means for writing the information to be processed, and information to be stored by the storage means in a storage medium provided in the transport means when the workpiece reaches the transport means in the input section of another production line. The invention according to claim 2 is characterized in that it includes a writing means for writing, and a plurality of production lines, and conveys the workpieces from the input section to the delivery section of each of the production lines, and also conveys the workpieces. After sending out the workpiece, the workpiece is moved to the input section again and circulates through the production line, and an intermediate conveyance means is used to transfer the workpiece from the output section of one production line to the input section of another production line. and a storage medium for storing information regarding the workpiece is provided in the transport means, wherein when the transport means to which the workpiece has been transferred reaches a delivery section of a production line. a reading means for reading the information from a storage medium provided on the conveyance means; a first storage means for storing the information read by the reading means; and when the workpiece is placed on the intermediate conveyance means; a second storage means that takes in the information in the first storage means; and a third storage that takes in the information in the second storage means when the workpiece is transported to an input section of another production line. and a writing means for writing the information in the third storage means into the storage medium of the transport means when the workpiece is placed on the transport means in the input section of another production line. The invention according to claim 3 is characterized in that the intermediate conveyance means is constituted by a plurality of continuous conveyance sections, and the second storage means is constituted from a plurality of storage areas corresponding to each conveyance section. , each of the storage areas captures information from the previous storage area when the workpiece is placed on the corresponding transport section, and the third storage means stores information when the workpiece is transported to the input section of another production line. The invention according to claim 4 is characterized in that the information is taken in from a storage area at the last stage of the second storage means, and the invention includes a plurality of production lines, and information on the processed material from the input section to the output section of each production line. A conveying means that transports the workpiece and, after sending out the workpiece, moves it again to the input section and circulates through the production line; A production management system comprising an intermediate conveyance means for transferring a workpiece, and a storage medium for storing information regarding the workpiece is provided in the conveyance means and the intermediate conveyance means, wherein the workpiece is transferred. a reading means for reading the information from a storage medium provided in the transporting means when the transporting means reaches a delivery section of a production line; a first storage means for storing the information read by the reading means; a writing device for writing information stored in the first storage device into a storage medium provided in the intermediate transportation device; a reading device for reading information stored in a storage medium provided in the intermediate transportation device; and the reading device. a second storage means for storing the information read by the workpiece; and a second storage means for storing the information read by the workpiece, and a second storage means for storing the information read by the workpiece, and a second storage means for storing the information read by the workpiece, and a second storage means for storing the information read by the workpiece, and a storage medium provided in the transport means when the workpiece reaches the transport means located in the input section of another production line. and writing means for writing information stored in the storage means.

"Operation" According to the invention described in claim 1, when a workpiece is transferred to a delivery section of a production line, information regarding the workpiece is read from the storage medium by the reading means. The read information is written to the storage means.

When the workpiece is transferred to the input section of another production line, the information written in the storage means is written to the storage medium by the writing means.

In the invention set forth in claim 2, when the workpiece is transferred to the delivery section of the production line, information regarding the workpiece is read from the storage medium by the reading means. When the workpiece is placed on the intermediate conveyance means, the information in the first storage means is taken into the second storage means. When the workpiece is transported to an input section of another production line, the information in the second storage means is taken into the third storage means. When the workpiece is placed on a conveyance means in an input section of another production line, the information in the third storage means is written to the storage medium of the conveyance means.

In the invention as set forth in claim 3, when a workpiece is placed on the corresponding transport section, the information in the previous storage area is taken into the subsequent storage area. When the workpiece is transported to an input section of another production line, the information stored in the last storage area of the second storage means is taken into the third storage means.

In the invention as set forth in claim 4, when the conveyance means that has transferred the workpieces reaches the delivery section of the first production line, the information stored in the storage medium provided in the conveyance means is read by the reading means. It will be done. The information read by the reading means is stored by the storage means. The information stored in the storage means is written into a storage medium provided in the intermediate conveyance means by a writing means. Information stored in a storage medium provided in the intermediate conveyance means is read by a reading means.

The information read by the reading means is read by the storage means. When the workpiece reaches the conveyance means in the input section of another production line, the information stored in the storage means is written by the writing means to a storage medium provided in the conveyance means. .

"Example" Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic diagram showing a part of an automobile production line to which the present invention is applied. In this figure, reference numerals 1 to 9 indicate processing stations that each perform a predetermined process, such as window installation, bumper installation, etc., respectively. Further, when the processing at the processing station 9 is completed, the body moves to the next line. Each of the processing stations 1 to 9 is provided with an automatic machine 11, which performs predetermined processing on the potties moving along the line. In addition, in FIG. 2, some automatic machines are omitted for the sake of simplification.

Also, in the line shown in Figure 2, each body
As shown in the figure, the hotty is placed on an automatic transport vehicle 12, and the automatic transport vehicle 12 moves the hotty along a line. However, when the processing at the processing station 9 of the illustrated line is completed, the automatic transport vehicle 12 and the hotties are separated, and only the automatic transport vehicle 12 is moved to the input section 15 (see the broken line in FIG. 2). In this way, the automatic transport vehicle 12 circulates along the line shown in FIG. 2. In the loading section 15, bodies that have been processed in the pre-process line are transferred to an empty automatic transport vehicle 12. The pre-process line has a different processing process from the pre-process line, and the delivery section 16 of the pre-process line and the input section 15 of the post-process line are connected by a lift device 17. The lift device 17 lowers the potty B from the second floor to the first floor by vertically moving it up and down while holding the potty B with a hanging member 17a. Note that the transfer from the automatic transport vehicle 12 to the r-knot device 17 and the transfer from the lift device 17 to the automatic transport vehicle 12 are performed by a transfer device (not shown).

In addition, in FIG. 2, illustration of an automatic machine and a part of a pre-process line are omitted for simplification.

In addition, in the pre-process line shown in FIG. 2, each body B is transported to an automatic transport trolley I2 for pallets etc. as shown in FIG.
The automatic transport vehicle 12 moves the body B along the pre-processing line.

However, when the door installation, which is the final processing section of the illustrated pre-processing line, is completed in the processing section 9, the automatic transport vehicle 12 and the body B are separated, and only the automatic transport vehicle 12 is transferred to the input section 15.
(See the dashed line in Figure 2). Note that the body B is transferred to the post-processing line by the lift device 17.

Body B circulates in the same way for the front-end process line.

Furthermore, an ID plate 20 is provided at the center of the side surface of the automatic transport vehicle 12, as shown in FIG. This I
Various information is written on the D plate 20 by microwaves generated from the antenna ANT, and the written information can be read out via the antenna ANT.

Information written on the ID plate 20 will now be explained with reference to FIG. 5. Incidentally, FIG. 5 is a schematic diagram showing the electrical configuration of this embodiment.

In FIG. 5, 30 is a host computer, which sequentially outputs body information for identifying products to be produced. The body information includes the following information.

■Insertion number with Yo code: Indicates the date and input number of the input to the hotline.

■Body model: Shows the Podi model name and whether it is 4-door or 2-door.

■Derivation: Indicates destination country, destination (cold region, etc.).

■Option code: Device with option set (
For example, it indicates whether or not to connect a car stereo, etc.).

■Frame No. 2 Indicates the identification number attached to the frame of the vehicle.

■Color specification code: This is a code that specifies the exterior color and interior color.

The above-mentioned body information is supplied to the device verification terminal 31, where it is first converted into an operation factor code.

The operation factor code is a code by which the automatic machine 11 can directly determine the operation. In this case, the model verification terminal 31 has a conversion table 31a that stores the relationship between the body information and the operation factor code, and creates the above-mentioned operation factor code by referring to this conversion table 31a. Furthermore, the model verification terminal 31 has a binary file 31b, and compresses the operating factor code by referring to this.
Create binary code. This is because the number of bits in the action factor code is extremely large, so it is not efficient to handle it as is. - Give an example.

and as follows.

Table 1 The upper part of the table above is a part of the operating factor code, and the lower part is the compressed binary code, which has a bit count of 1/8. Each automatic machine stores an operation pattern for determining its operation, and this operation pattern is determined based on the binary code.

Now, the model verification terminal 31 sets the binary code and body information as a set and writes them into the ID port 20 via the antenna ANT shown in FIG.
(referred to as D information). This writing is performed at the beginning of the production process. In addition, in the case of this embodiment, the production process is divided into multiple partial processes (the process shown in Figure 2 is one of them), and when the body moves from one process to the next, ID information is also transferred. It is now transferred to the next process. This is due to the following reason.

The ID puto 20 is attached to a pallet or an automatic carrier, and these are circulated on the line in each process. However, when you move the body to the next line, unless you also move the ID information, the body and ID
This is because it becomes impossible to correspond to the information.

For example, in the input unit 15 of the process shown in FIG. 2, ID information at the end of the previous process is transferred by the transfer control unit 35 shown in FIG. This process begins with the transfer control unit 35
Alternatively, the information in the ID port 20 at the end of the previous process is read via the antenna ANT. Then, in synchronization with the body being transferred onto the automatic carrier 12 in the loading section 15, the read ID information is written to the ID port 20 on a new line via the antenna ANT. In this way, the ID information always moves in synchronization with the body.

Next, as shown in FIG. 5, each automatic machine 11 has an antenna ANT near it, and is adapted to read ID information of an incoming body. In this case, the ID
The automatic machine is designed to read only the necessary part of the information, rather than all of it. That is, the model verification terminal 31 creates binary codes necessary for all automatic machines and writes them into the ID boot 20, but each automatic machine 11 reads only the necessary part (predetermined bits).

In addition, the overall panel 40 shown in FIG.
Data for production management is exchanged with 1. Further, in this embodiment, the automatic machine 11 is capable of detecting the time required for machining, and outputs the detected data to the overall board 40. The overall panel 40 transfers this to the office terminal 31 via the data manager 42, and the office terminal 31 displays the detected data on a display device (not shown).
Allows monitoring of machining time. Also, on the entire board 40, the machining time or read information is displayed on a predetermined display device.
Displays the contents of D information.

Furthermore, in this embodiment, the data communication network between the model verification terminal 31 and the data manager 42 is a LAN.
(local area network). This network will be explained below.

In addition to the terminals mentioned above, the following terminals are connected to the network: a collation backup terminal 43, a file manager 44, and an office terminal 45.

The verification bankup terminal 43 has exactly the same configuration and functions as the model verification terminal 31, and performs the same data communication with the host computer 30 and with each terminal connected to the network. ing. this is,
This is to enable an immediate replacement when the model verification terminal 31 goes down for some reason. The file manager 44 manages various information flowing through the network (for example,
equipment operation information, etc.) and files them.
Periodically monitor whether each terminal is operating normally. The office terminal 45 divides the entire line into several blocks and monitors the operating state of each block. It also issues a command to start or stop the line. The operating state monitor in the office terminal 45 displays the line layout on a CRT display device, for example, and uses color to indicate whether each operation is in the automatic operation state, manual operation state, or end state. indicate. In this case, since the automatic machine 11 can recognize its own operating state, information indicating this is sent to the file manager 44 via the overall panel 40 and the data manager 42.
The file manager 44 then displays the above-mentioned colors based on the information.

In addition, a file manager 44 and an office terminal 45
has the same function as the datum failure/year 42, and becomes a substitute when the datum failure/year 42 goes down. On the other hand, during normal operation, each terminal extracts and captures only the information necessary for its own operation.

Further, each input number and its corresponding ID information are stored as a set in the data databaser 42, file manager 44, and office terminal 45. If the information on the ID plate 20 is lost for some reason, it can be restored according to the respective stored contents.

This restoration process is performed, for example, as follows.

Suppose now that the ID information of the ID plate 20 attached to a certain automatic transport vehicle 12 is lost. In this case, the operator checks the input number on the ID plate 20 provided on the automatic transport vehicle in front of or behind the automatic transport vehicle 12. Since these input numbers are read by the automatic machine 11, the operator only has to check the input numbers read by the automatic machine 11. Since the input number is a serial number, if you know whether it is the previous or subsequent input number, you can know whether it is the input number for the ID plate whose information has been lost. Then, the operator inputs the input number from a key fob (path shown) provided on the automatic machine 11 or the overall panel 42. This submission number is supplied to the data manager 42, and the data manager 42 uses the ID corresponding to the supplied submission number.
Find information. Then, the data manager 42
The searched ID information is transferred to the whole board 40 or the automatic machine 11. When the ID information is transferred, the overall panel 40 or the automatic machine 11 displays the contents on the display section. By looking at the display, the operator can find out how much information has been lost, and enters this information into a handheld writing device (as shown). Then, writing is performed on the ID plate 20 using this writing device. ID information is restored as described above. In addition, if ID information for a plurality of subsequent devices is to be stored in the ID plate, the information for the plurality of devices may be sent from the data manager 42. If information for a plurality of vehicles is stored in the ID plate, it is known in advance what kind of processing should be performed on each automatic machine 11 or the following vehicle, so preparations can be made quickly.

Further, if the ID information stored in the data manager 42 is destroyed for some reason, recovery processing can be performed using the ID information stored in the file manager 44 or the office terminal 45.

The transfer means includes an antenna ANT that reads ID information from the ID plate 12 as shown in FIG. a first memory that stores ID information stored therein; a first sensor 37a that detects passage of the body B midway through the lift device 17; and a second memory to which the ID information stored therein is transferred from the first memory; A second sensor 37b detects that the body B has reached the first floor, a third memory transfers the ID information stored therein from the second memory, and an automatic transport device 12 that circulates through the post-process line. It is equipped with a third sensor 37c that detects that the vehicle is placed on the vehicle, and a controller 35. controller 35
transfers the ID information from the first memory to the second memory based on the sensor ring of the first sensor 37a, transfers the ID information from the second memory to the third memory based on the sensor ring of the second sensor 37b, and transfers the ID information from the second memory to the third memory based on the sensor ring of the second sensor 37b; Based on the sensing of the sensor 37c, ID information is sent to the antenna ANT, and a write signal is output to write the ID information.

Next, the operation of this embodiment with the above configuration will be explained.

Body information is sequentially output from the host computer 30 in accordance with mass and production plans. This body information is converted into an operating factor code at the model matching terminal 31 according to a text file. Then, the first input section 15 of the process
At this time, the vehicle type information and operating factor code are written in the ID plate 20 of the corresponding body B, and thereafter, each automatic machine performs automatic processing by reading the operating factor code in the ID plate 20.

For example, in the automatic machine 11 of the processing unit 1, the window installation shown in FIG.
The window is selected, moved, and installed according to this operating factor code. This process is the same in the three-liquid injection processing section 4, the battery charging processing section 7, and other processing sections.

In this case, since the operating factor code is formed in correspondence with each machine type, each processing machine 11 can perform processing in accordance with it even if different models coexist on the pre-process line. Further, since the operation factor code is a code that only determines the basic operation of each processing machine, the combination thereof can be changed as appropriate, and the degree of freedom of the processing machine is large. Therefore, even if a major model change occurs, by rewriting the text file in the model verification terminal 31 accordingly, an operation factor code corresponding to the change will be created, allowing each processing machine to respond immediately. be able to.

Next, the case where body B is transferred from the pre-process line to the post-process line will be explained using FIG. 6. When body B is transferred to the delivery section 16 of the post-process line, the ID
Information is read from the ID plate 20 by the antenna ANT. The read ID information is written to the first memory by the controller 35. First sensor 37
When a detects the arrival of the automatic transport device 20 and outputs the detection signal, the ID information stored in the first memory is transferred from the first memory to the second memory by the controller 35. When the second sensor 37'b detects the passage of the body B and outputs the detection signal, the [D information stored in the second memory is transferred from the second memory to the third memory by the controller 35. When the third sensor 37c detects that Potty B has been transferred to the automatic transport device 20 and outputs a detection signal, the ID information stored in the third memory is transferred to the ID plate 20 by the controller 35 via the antenna ANT. will be written to.

As described above, ID information is reliably transferred from the ID plate 20 provided on the automatic transport device 12 that circulates through the pre-process line to the ID plate 20 provided on the automatic transport device 12 that circulates on the post-process line without stopping the production line. can do.

In this embodiment, three storage means are provided, but this is not intended to limit the scope of the present invention, and the present invention can use any number suitable for implementing the present invention.

Furthermore, although the controller 35 was activated based on the detection signals from the sensors 37a, 37b, and 37c, this is not intended to limit the scope of the present invention. Any method suitable for carrying out the present invention can be used, such as means for reading the time until the transfer to the controller 35 and transferring the information every time the time elapses.

Furthermore, although production lines are provided over different floors, this is not intended to limit the scope of the present invention, and in the present invention, a production line consisting of multiple processes is provided on the same floor as shown in FIG. It can also be applied in cases where In such a case, an antenna ANT is provided at the end point of one process and the start point of the next process, and the ID plate provided on the automatic transport vehicle 12 that circulates through the one process by the antenna ANT provided at the end point of one process. Antenna A reads the body information stored in 20 and installs it at the starting point of another process.
Automatic transport vehicle 12 that circulates through other processes by NT
write it on the ID plate 20 provided in the. Through the above steps, body information can be transferred from one step to another.

Further, the lift device 17 can also be provided with an ID plate 20. In such a case, one ANT writes the read body information to the ID plate 20, and then writes the body information from the ID plate 20 again to the other ID plate 20 by another ANT. Body information can be transferred through the above steps.

"Effects of the Invention" Since the present invention is configured as described above, it produces the effects described below.

information about the workpiece without stopping the production line (
Since commands can be reliably transferred from one storage medium to another, the yield and production speed of the production line can be improved. As a result, according to the present invention, productivity in such a production line can be improved.

Note that each processing machine operates according to the operation instructions stored in the storage medium of the workpiece, so there is no misjudgment of the machine type, and there is no need for time-consuming operation. Therefore, productivity can be improved.

In addition, the operation of each processing machine is determined by the operation instruction take, and since it is created based on this operation instruction data or a text file in the conversion means, the program for each processing machine can be changed even if the model changes. It has the advantage of being able to respond immediately by changing only the text file without making any changes.

[Brief explanation of drawings]

FIGS. 1(a) to 1(d) are functional block diagrams showing the configuration of the present invention, FIGS. 2 to 6 show one embodiment of the present invention, and FIG. 2 is a functional block diagram showing the configuration of the present invention. 3 is a schematic configuration diagram showing a part of the line, FIG. 3 is a schematic configuration diagram showing an automatic transport vehicle, FIG. 4 is a perspective view of a lift device, and FIG. 5 is a block diagram showing an electrical configuration in the front-end production line. Figure 6 is a configuration diagram showing the electrical configuration of the lift device, and Figure 7 is a diagram showing the electrical configuration of the lift device.
FIG. 3 is a perspective view showing a transfer state in two production lines. S... Pre-process line (first production line), F.
...Post-process line (other production line), ANT,
ANT,, ANT, ... Antenna (data writing means, reading means) B... Body (workpiece), 11.
...Automatic machine, 12...Automatic transport cart (1M feeding means), 15...Input section, 16. Output section, 17...
...Lift device (intermediate conveyance device), 20...ID
Plate (storage medium), 30... host computer, 31... model verification terminal (take conversion means, data writing means), 35... controller (control means), 36 a...・・First memory-136b・・
...Second memory, 36c...Third memory, 3
7a...first sensor, 37b...second sensor, 37C...third sensor. Figure 4 [t====wo Figure 6 7'-\,

Claims (4)

[Claims] (1) Workpieces are conveyed through multiple production lines and from the input section to the output section of each production line, and after being sent out, the workpieces are moved back to the input section and circulated through the production lines. A production management system comprising: a transport means; the transport means is provided with a storage medium for storing information regarding the workpiece; a reading means for reading the information from a storage medium provided in the transport means when reaching the above-mentioned transport means; a storage means for storing the information read by the reading means; and a storage medium provided in the transport means in another production line. a writing means for writing the information stored in the storage means; and a writing means for writing the information stored in the storage means, and a storage medium provided in the transport means when the workpiece reaches the transport means in the input section of another production line. 1. A production management system comprising: a writing means for writing information stored in the storage means. (2) Workpieces are conveyed through multiple production lines and from the input section to the output section of each production line, and after being sent out, the workpieces are moved back to the input section and circulated through the production lines. It has a conveyance means, and an intermediate conveyance means for conveying the workpiece from a sending section of one production line to an inputting section of another production line, and a storage medium storing information regarding the workpiece is stored in the conveyance means. A production control system provided in a production management system, comprising: reading means for reading the information from a storage medium provided in the conveying means when the conveying means carrying the workpiece reaches a delivery section of a production line; a first storage means for storing the information read by the reading means; a second storage means for taking in the information in the first storage means when the workpiece is placed on the intermediate conveyance means; a third storage means for capturing information in the second storage means when the workpiece is transported to the inputting section of another production line; 1. A production management system comprising: writing means for writing information in the third storage means onto a storage medium of the transport means when placed on the means. (3) The intermediate conveyance means is constituted by a plurality of continuous conveyance sections, and the second storage means is constituted from a plurality of storage areas corresponding to each conveyance section, and each of the storage areas corresponds to a corresponding conveyance section. When a workpiece is placed on the storage area, the third storage means takes in the information in the previous storage area, and when the workpiece is transferred to the input section of another production line, the third storage means stores the information stored in the last storage area of the second storage means. 3. The production management system according to claim 2, wherein information is taken in from a storage area of a stage. (4) A plurality of production lines, and the workpiece is transported from the input section to the output section of each production line, and after the workpiece is sent out, it is moved again to the input section and circulated through the production line. It has a conveyance means, and an intermediate conveyance means for conveying the workpiece from a sending section of one production line to an inputting section of another production line, and a storage medium storing information regarding the workpiece is stored in the conveyance means. and a production control system installed in the intermediate conveyance means, which reads the information from a storage medium installed in the conveyance means when the conveyance means carrying the workpiece reaches a delivery section of a production line. a reading means; a first storage means for storing the information read by the reading means; a writing means for writing the information stored in the first storage means onto a storage medium provided in the intermediate conveyance means; a reading means for reading information stored in a storage medium provided in the intermediate transport means; a second storage means for storing the information read by the reading means; and a second storage means for storing the information read by the reading means; 1. A production management system comprising: writing means for writing information stored in the second storage means into a storage medium provided in the transport means when a workpiece arrives.