JP2571866B2 - Mobile communication management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to management of a moving body by a control device such as a programmable controller while performing communication with various moving bodies by a so-called ID system or the like. The present invention relates to a mobile communication management system.

(Prior art) The ID system uses an interrogator that performs microwave communication with a transponder attached to each mobile object,
The ID code for identifying this moving body is read, and various other data stored in each moving body are read and written.

FIG. 3 shows an example of a programmable controller (hereinafter, referred to as “PC”) using the ID system. Here, a case where the moving body 2 moves sequentially on the conveyor belt 1 and the PC 3 manages the moving body 2 will be described. Each moving body 2 has
An ID plate 4 serving as a transponder is attached. this
The ID plate 4 stores an ID code for identifying each mobile unit 2 and various data for managing the mobile unit 2. ID unit 5 connected to PC3 as interrogator
Communicates with the ID plate 4 of the nearest moving body 2 via the antenna 6 to read out an ID code and data from the ID plate 4.

When reading the ID code and data by the conventional system, an ID code read command is first issued in the first step S11 on the sequential program of the PC 3, as shown in FIG. Then, the ID unit 5 reads this command, communicates with the ID plate 4 of the nearest moving body 2 by microwave through the antenna 6, and transmits an ID code read request (step S12). At this time, if the auto read / write mode is used, when the mobile unit 2 exists within the effective range A of the antenna 6 shown in FIG. 3, communication with the ID plate 4 of the mobile unit 2 is automatically started. It has become so. When the ID plate 4 returns the ID code in response to the ID code read request (step S13), the ID unit 5 receives the ID code (step S14) and notifies the PC 3 of the completion of the ID code reception. . The PC 3 confirms the end of the command based on the notification (step S15), and saves the transmitted ID code (step S16).

In the sequential program of the PC 3, subsequently, the start address of the data to be read and the number of bytes to be read are set (step S17), and a data read command is issued (step S18). Then, the ID unit 5 reads this command again, and
Communication is performed with the ID plate 4 and a data read request is transmitted (step S19). When the ID plate 4 returns data from the corresponding address in response to the data read request (step S20), the ID unit 5 receives the data (step S21), and notifies the PC 3 of the completion of the data reception. Notice. The PC 32 confirms the end of the command based on the notification (step S22), and saves the transmitted data (step S23).

(Problems to be Solved by the Invention) However, in the conventional system, the ID code read command and the data read command are separately issued as described above. For this reason, as shown in FIG. 5, the ID unit 5 reads the ID code read command, starts communication for reading the ID code, and once ends the communication, reads the data read command. It is necessary to perform communication for reading data again.

However, when a plurality of mobile units 2 exist within the effective range A of the antenna 6, the ID unit 5 communicates only with the ID plate 4 having the highest response sensitivity. Accordingly, for example, as shown in FIG. 3, when two moving bodies 2 are present at substantially equal distances within the effective range A,
Even if the communication for reading the ID code is performed with the preceding mobile unit 2a, when the subsequent mobile unit 2b moves closer, the subsequent communication for reading data is performed on this mobile unit 2a. 2b.

As a result, conventionally, even when data was read following the ID code, this data was read first.
It is not always guaranteed that the ID is from the mobile unit 2 having the ID code, and the PC 3 may erroneously associate the ID code of the different mobile unit 2 with the data.

In view of the above circumstances, the present invention is configured to read out an ID code and data from a transponder of a mobile body by a series of communication procedures, so that the mobile body that has read the ID code is different from the mobile body that has read the data. It is an object of the present invention to provide a mobile communication management system capable of reliably preventing such an error.

(Means for Solving the Problems) A mobile communication management system according to the present invention uses an ID code for identifying each of a plurality of mobile objects that move at a substantially constant speed at a predetermined distance and various data on a main body side. A transponder to be transmitted in response to a request from each mobile unit is provided, and an ID code and data are transmitted from the transponder of each mobile unit via an interrogator on the main body that communicates with the transponder. A mobile communication management system that reads and manages the mobile object, and includes at least one data together with an ID code in response to one command in a series of communication procedures from the start of communication to the end of communication by an interrogator on a main body side. All parts from the transponder at once
An ID code and data reading means are provided, thereby achieving the above object.

(Operation) According to the above configuration, the ID code provided for each mobile unit is an identification code for identifying each mobile unit, that is, an identification code separately assigned to each mobile unit. In response to one command in a series of communication procedures from the start of communication by the interrogator on the main body side to the end of communication,
Since at least a part of the data is read out together with the ID code from the transponder, even when each mobile object to be managed moves at a substantially constant speed at a small interval, the ID code and data of each mobile object can be read. Readout is not confused with other moving objects.

To explain a little more specifically, as an example, assuming that the interrogator performs microwave communication with a transponder attached to each mobile object via an antenna, the interrogator is within the effective range of the antenna (interrogator). Even if there are two moving objects within the communication range of), it is possible to identify which moving object is communicating with the ID code. Then, the data is read at once following the ID code.

For this reason, even when two moving bodies are present in a narrow space, the ID code and data are always read out to the main body in association with each other. There is no need to read the ID code and data of a moving object confused with those of another moving object.

(Examples) The present invention will be described below with reference to examples.

1 and 2 show an embodiment of the present invention. FIG. 1 is a flowchart showing the operation of a PC and an ID system, and FIG. 2 is a time chart showing the operation of the ID unit of FIG. FIG. 3 is a block diagram showing a configuration of a PC using the ID system.

In the present embodiment, as shown in FIG. 3, a PC (programmable controller) 3 using an ID system manages a moving body 2 moving on a conveyor belt 11.

The ID system includes an ID unit 5 and a plurality of ID plates 4. The ID unit 5 has a communication device as an interrogator for performing microwave communication with the ID plate 4 via the antenna 6. The ID plate 4 is a communication device as a transponder that communicates with the ID unit 5, and is attached to each mobile unit 2. Also this
The ID plate 4 stores an ID code and various data. The ID code is a code separately assigned to each mobile unit 2 to identify each mobile unit 2. Various data,
For example, it is composed of data stored in advance to identify the type of the moving body 2 or data indicating the state of the moving body 2 which is written or rewritten in response to a request from each interrogator during the movement, It is used for management of this mobile unit 2. The communication between the ID unit 5 and the ID plate 4 is started after confirming an appropriate communication partner according to a predetermined communication procedure, and is ended when a series of transmission / reception is completed.

In the PC 3, predetermined control is executed by the system program repeatedly scanning the sequential program created by the user. Each command used in the sequential program is prepared in advance in the system program. This command includes an ID code and a data read command. The ID code and the data read command are transmitted to the ID unit 5 by the ID unit 5.
This is a command to collectively read the ID code and data from the plate 4 by a series of communication procedures. Note that the system program may also include a conventional ID code read command and a data read command.

The operation when the ID code and the data read command are used for the sequential program of the PC 3 in the above configuration will be described with reference to FIG.

The system program repeatedly scans the sequential program, and when the condition for detecting the moving body 2 is satisfied in the auto read / write mode, for example,
The start address of the data to be read from the plate 4 and the number of read bytes of the data are set in a predetermined register or the like (step S1), and then an ID code and a data read command are issued (step S2). Then, the ID unit 5 reads the command, communicates with the ID plate 4 of the nearest moving body 2 by microwave through the antenna 6, and transmits an ID code and a data read request (step S3). . Note that this ID code and data read request are:
If the ID plate 4 accepts this and sequentially sends out the ID code and data, it is transmitted as it is. However, when the ID plate 4 is not prepared to accept such a request, the request may be divided into a conventional ID code read request and a data read request and transmitted sequentially from the ID unit 5. And this ID
When the ID plate 4 sends back the ID code and the data from the corresponding address in response to the code and data read request (step S4), the ID unit 5 receives the ID code and sends it to the PC.
3 and temporarily store it in the communication buffer (step S
5) Notify PC3 of completion of receiving the ID code and data. PC
In step 3, when this notification is detected by repeatedly scanning the system program and the end of the command is confirmed (step S6), the ID code and the data read in the communication buffer are saved in a predetermined memory (step S7, S
8).

As a result, in the ID unit 5, as shown in FIG.
When the communication is started by reading the ID code and the data read command, the communication is ended after reading the ID code and predetermined data by this series of communication procedures.
Therefore, as shown in FIG.
Even when two mobile units 2 are present at substantially equal distances within each other, communication with the ID unit 5 is always performed on one of the mobile units 2 side. Two
The ID code and data can be reliably read out only from the ID plate 4. For this reason, PC3 is a different mobile
There is no danger that the ID code and the data will be mistaken for each other, and the mobile unit 2 can be reliably managed.

(Effects of the Invention) As is clear from the above description, according to the mobile communication management system of the present invention, the ID code and the data can be read out collectively from the same mobile body. Management can be performed reliably.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a flowchart showing the operation of a PC and an ID system, and FIG. 2 is a time chart showing the operation of an ID unit. FIG. 3 is a block diagram showing a configuration of a PC using an ID system. 4 and 5 show a conventional example, FIG. 4 is a flowchart showing the operation of the PC and the ID system, and FIG. 5 is a time chart showing the operation of the ID unit. 2 ... mobile object, 3 ... PC, 4 ... ID plate (responder), 5 ... ID unit (interrogator).

Claims (1)

(57) [Claims] A transponder which transmits an ID code for identifying each of a plurality of moving objects which are moved at a substantially constant speed at a predetermined distance and various data in response to a request from a main body side. And a mobile communication management system that manages the mobile by reading an ID code and data from the transponder of each mobile via an interrogator on the main body that communicates with the transponder. In response to one command in a series of communication procedures from the start of communication to the end of communication by the interrogator on the main body side, an ID code for collectively reading out at least a part of data from the transponder together with the ID code and A mobile communication management system including data reading means.