JPH02269544A - Article discrimination system - Google Patents

Abstract

PURPOSE:To remarkably improve possibility of communication by constituting a write/read control unit to repeatedly send out commands to a data carrier at unattended error of the data carrier and to send out access commands until the re-try counter reaches a prescribed value. CONSTITUTION:A write/read control unit 6 sends out commands to a data carrier 4 through data transmitting means 5,3, repeatedly sends out commands at unattended error of the data carrier 4, and comprises a re-try counter to count up every access error to unstable territory. Further, it is provided with an auto-command sending means 7 to send out access commands until the re-try counter reaches a prescribed value. Hereby, when the data carrier 4 approaches the write/read control unit 6 and reaches the unstable territory, even if a transmitting error is generated, data communication can be performed in stable territory, because of sending out of the access commands again. Consequently, possibility of communication can be remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an identification system for tools for machine tools, parts in factories, products used in product management, distribution systems, and the like.

[Conventional technology]

In order to mechanize the tool management of conventional machine tools and the identification of parts and products on assembly lines in factories, tools 1
A system is needed to identify and manage various items such as parts and products. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 63-221950, a memory unit having a memory is provided in the object to be identified, and necessary information is written into such memory by external data transmission, and the information is read out as necessary. Various article identification systems have been proposed.

In such an identification system, a data carrier having data is attached to a bullet or the like on a conveyance line, and a write/read control device for transmitting data to and from the data carrier is fixed to the side of the transmission line. The write/read control device ensures that data transmission only takes place when a pallet with data carriers reaches the communication area. An autocommand mode is provided in which commands are continuously sent at predetermined time intervals until the data carrier reaches the communication area of the write/read control unit.

FIG. 6 is a diagram showing the access flow in auto command mode. When an auto read or auto write command is sent from the host computer, the ID controller receives and decodes this controller, and accesses the data carrier at predetermined intervals. Send a command. Then, this command continues to be sent until the data carrier approaches, and when the data carrier reaches the communicable area, the command is received, and the response is sent, the ID controller 1 receives the response from the data carrier, After processing, a response to the auto-read or auto-write 1-command is sent to the third-order computer, and the processing is completed.

[Problem to be solved by the invention]

In such a conventional identification system, as shown in FIG. 7, the write/read control device has an unstable communication area A2 around a stable communication area AI. And if a command is sent when the data carrier enters an unstable region, errors are likely to occur. However, in conventional identification systems, if data carriers are in close proximity during transmission in autocommand mode and an error occurs due to access in an unstable area, autocommands are immediately stopped at that point.
There was a drawback in that data communication could not be performed even after the data carrier entered a stable communication area.

The present invention has been made in view of the problems of the conventional article identification system, and even if the data carrier is in an unstable region and there is a transmission error when sending a command in the O-I mode, the command 1-1 is sent again. The technical challenge is to be able to send out and execute autocommands.

[Means to solve the problem]

As shown in FIG. 1, the present invention comprises a memory 1 that holds data, a memory control means 2 that controls writing and reading of data to the memory, and a memory control means that demodulates commands and data given from the outside. It has a data transmission means 3 for transmitting data given to and read out, a data carrier 4 attached to the article to be identified, and a data transmission means 5 for transmitting data to the data carrier and receiving the transmitted data. An article identification system comprising a write/read control unit 6, the write/read control unit sends a command to a data carrier via a data transmission means, and repeats the command in the event of a data carrier absence error. It is characterized by having an autocommand sending means 7 which includes a retry counter that sends out the access command and amplifies the count every time there is an error in accessing the unstable area, and sends out the access command until the retry counter reaches a predetermined value. be.

[Effect]

According to the present invention having such characteristics, the command is repeatedly sent until the data carrier comes close to data sending I and +7 in the auto command.

Even if the data carriers are close to each other, an error occurs during data transmission, and the i~rai counter is incremented.
The access command is being sent again.

If normal access is possible before this counter counts up, it is assumed that the autocommand has been executed and the command transmission is stopped.

〔Effect of the invention〕

Therefore, according to the present invention, even if a transmission error occurs when the data carrier is close to the write/read control unit and reaches the unstable area, the access command is sent again, so data III transmission is performed in the stable area. be able to. Therefore, the effect that the possibility of 1J11 communication can be greatly improved can be obtained.

[Explanation of Examples]

FIG. 2 is a block diagram showing the structure of an article identification system according to an embodiment of the present invention. In this figure, the article identification system is a pallet that holds parts to be identified.Q
a, 10b---- are configured to convey the conveyance path 11''-, and each of the bullets 10a,
10 b------One data carrier 12 respectively
is installed directly. In addition, the read/write head (
(hereinafter referred to as an RW head) 13, and an ID controller 14 connected to the RW head 13 to control its operation. RW head 13 and ID controller roller 14
constitutes a write/read control unit 6. Further, the ID controller 14 is connected to a host computer 15.

Now, as shown in the block diagram in FIG.
A memory 22 for holding the system program and data thereof is provided, and a human output interface 23 for human output with the host computer 15 is provided. C
The input/output terminal of the PU 21 includes an encoding circuit 24 and a decoding circuit 25 for encoding data to be transmitted to the data carrier 12.
is connected. Now, the RW head 13 is the encoding circuit 2.
4, and a transmitter 27 driven by the output.

The transmitter 27 transmits data to the data carrier by outputting an FSK modulated signal from a coil, for example. Further, the received signal obtained from the data carrier is given to the demodulation circuit 29 via the receiving section 28. The demodulation circuit 29 demodulates this signal and provides it to the decoding circuit 25.

Next, the configuration of the data carrier 12 will be explained with reference to FIG. 4. In FIG. 4, a transmitting/receiving section 31 receives and transmits a frequency signal emitted from the RW head 13, and its received output is given to a demodulation circuit 32. The demodulation circuit 32 demodulates this signal and provides its output to the demodulation circuit 33. The decoding circuit 33 decodes the encoded data into an original signal and provides it to the control section 34. The control unit 34 is connected to a memory 35 via a lotus, for example, a memory 35 constituted by a block RAM or an E"FROM hacked up by a battery 36. The memory control means 2 controls writing or reading of data according to commands and data read out, and the read data is converted into a serial signal and given to the encoding circuit 37. The encoding circuit 37 is connected to the ID controller 14. It encodes the applied signal in the same way as the encoding circuit 24, and its output is sent to the transmitting/receiving section 31 via the modulating circuit
given to. The transmitting/receiving section 31 transmits the signal by changing the resonant frequency of the resonant circuit as in the conventional example.
This is given to the W head 13 side. Here, transmitter/receiver 3
1. The demodulation circuit 32 and the modulation circuit 38 demodulate command data given from the ID unit and give it to the memory control means, and the data transmission means 3 transmits the read data.
It consists of

Next, the operation of this embodiment will be explained with reference to a flowchart. FIG. 5 is a flowchart showing the operation of the ID controller. When the operation starts, first step 41
Waits for commands to be received. The commands are the read and write commands to read and write data from the host computer 15, and the write command and write command, and the O1-read and OI commands, which automatically repeat the same operation until the data carrier arrives.
・It is one of the write commands. If a read command or an auto-read command is received among these commands, the process proceeds from step 42 to step 43 and the command is decoded. The command is decoded by decoding the read address, read address, etc., and then the process proceeds to step 44 where the read command is sent to the data carrier 12. The process then proceeds to step 45 and waits for a response from the data carrier 12. If there is no error in the response, the response after the read is completed is sent to the host computer 15, and the process ends (step 46). Also step 45
If there is an error in step 47, it is checked whether it is an auto read command. If it is not an auto read command, it is a normal read command, so the process proceeds to step 48, where the read error response is returned to the host computer 15 and the process ends. Also step 47
If it is an auto read command, check whether it is an absence error. If it is an absence error, the process returns to step 44 to send out the read command again and perform the same process.

In this way, read commands are continued to be sent at predetermined intervals as in the conventional example until the data carrier 22 approaches. If it is not an absent error, proceed to read/write.If the communication enters the unstable communication area of 2nd/13, or even if it is in the stable area, it is determined that a transmission error has occurred due to the influence of noise, etc., so the retry counter is incremented. (Step 50
). Then, proceeding to step 51, it is checked whether this counter has reached a predetermined number N and the count has been amplified.
If the retry count N has not been reached, the process returns to step 44 and repeats the same process. When the number of tries reaches N, the process proceeds to step 48, where a read/write error response is sent to the host computer and the process is terminated.

Similarly, if the received command is a write command, the process proceeds from step 52 to step 53 and the write command is decoded. This decoding is the decoding of write address, write data, and write hide number.
Thereafter, the process proceeds to step 54 and a RIE I command is sent to the data carrier 12. Then, in step 55, it is checked whether the command has been executed normally by the data carrier 12, and if no error occurs, a response of ``Rie I-End'' is sent to the host computer 15, and the process is completed (step 56). If an error occurs, check whether it is an auto command in the case of a read-o-I command (step 57), and if it is not an auto command, send a read 1~error response to the computer (step 5B) for processing. end. If it is an auto command, the process proceeds to step 59 to check whether there is an absence error, and if it is an absence error, the process returns to step 54 and repeats the same process. Also, if it is an absence error, 1 to increment the live counter in step 60.
), proceed to step 1 and check whether this counter has counted up to 1 - the number of runs (N).

If the retry count has not been reached, the process returns to step 54 and repeats the same process, and if the retry count has been reached, the process proceeds to step 58, where a write error response is sent and the process is terminated. If it is not a write command in step 52, the process advances to step 62, where an undefined error is sent and the process returns to step 41.

As described above, according to the present invention, when an autocommand is issued, the command is repeatedly sent even if there is a non-presence error, and when there is no non-presence error, the retry counter is incremented, and the retry is repeated up to a predetermined number of times, thereby ensuring that the autocommand is executed. I'm trying to make it possible. Also, the number of retries N is as shown in Figure 2.
2 is fixed to a pallet 10 or the like that passes through the first general transport route 11, it is preferable to set the speed according to the transport speed of the transport route. Therefore, it may be set manually each time the conveyance speed of the data conveyance line is changed, or the output of the speedometer 70 that detects the conveyance speed is given to the ID controller, and the number of retries N is automatically set based on the speed signal. You may also set it.

[Brief explanation of drawings]

Figure 1 is a functional block diagram showing the overall configuration of the present invention, Figure 2 is a functional block diagram showing the overall configuration of the present invention.
The figure is a perspective view showing the overall structure of the article identification system, FIG. 3 is a block diagram showing the structure of the ID fan 1-roller, FIG. 4 is a block diagram showing the structure of the data carrier, and FIG.
l) Flowchart showing the operation of the controller, No. 6
FIG. 7 is an access flow diagram of a conventional identification system, and FIG. 7 is a schematic diagram showing a communication area between a conventional write/read control unit and a data carrier.

Claims (1)

[Claims] (1) A memory that holds data, a memory control means that controls writing and reading of data to the memory, demodulating commands and data given from the outside, and transmitting the read data to the memory control means. a data carrier that is attached to an article to be identified, and a write/read control unit that has a data transmission means that transmits data to the data carrier and receives the transmitted data. In the article identification system, the write/read control unit sends a command to the data carrier via the data transmission means, repeatedly sends the command in the case of a data carrier absence error, and also sends the command to the unstable area. 1. An article identification system comprising: a retry counter that counts up every time an access error occurs, and an autocommand sending means that sends an access command until the retry counter reaches a predetermined value.