JP3521601B2 - Data transmission device and ID system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device including an ID controller and a programmable logic controller.

[0002]

2. Description of the Related Art In a conventional identification system, as shown in FIG. 7, a data carrier 1 attached to an article or the like for holding data and a read / write head 2 for writing and reading data in a non-contact manner between the data carrier. , And the ID controller 3. The data carrier 1 holds the written data, and the read / write head 2
When the communicable area in the vicinity of is reached, data is read based on the command from the ID controller 3 and the read / write head 2, and the data is read by a programmable logic controller or programmable controller higher than the ID controller 3. It is simply transferred to a programmable logic controller (PLC). Programmable logic controller body 4 and I
An input unit 5 having, for example, an 8-bit input terminal is connected to the D controller 3, and the data of the ID controller 3 is transferred to the programmable logic controller main body 4. Here, in addition to the data, the input unit 6 for inputting a normal signal indicating that the data is fixed and an error detection signal for notifying a communication error is required. Further, a trigger input terminal for reading and outputting data from the data carrier after the trigger input from the programmable logic controller 4 is required. The input unit is usually configured as an 8-bit or 16-bit unit. Therefore, if the data output line of the ID controller 3 is 8 bits (8 lines) and the control signal input / output line is 3 lines, for example, two 8-point input type input units 5 and 6 and an output unit 7 are used for connection. Will be required.

In addition, 2 bytes of data are simultaneously output 16
A bit parallel output type ID controller requires a normal output, an error output and a trigger signal input terminal in addition to a 16-bit data output terminal. Therefore, an input unit capable of inputting 18 bits is required on the programmable logic controller side, and the number of wirings is large, so wiring is troublesome.

FIG. 8 is a time chart showing a data transfer state of this data transmission device. Figure 8 in auto mode
When the ID controller 3 succeeds in communicating with the data carrier as shown in the upper row of FIG.
Outputs normal signal when data is established. The programmable logic controller 4 includes an input unit 5,
These data and control signals are received at predetermined sampling intervals via 6, and this input is received at the timing when the normal signal is at the H level and is used as a data input. If communication fails, an error signal is output as a control signal. In the trigger mode, the data carrier 1 is temporarily stopped as shown in the lower part of FIG. 8, and if there is a trigger input, the above-described operation is performed to read the data. Also in this case, if the data is normally read, a normal output is issued to confirm the data, and if there is a communication error, an error signal is output.

[0005]

However, in the conventional data transmission apparatus, since the output of the ID controller is, for example, 8 bits or 16 bits, an 8-point input unit or a 16-point input unit is used as an input unit corresponding to this. There was a need. Further, there is a drawback that an extra input terminal is generated in the input unit 6 as shown in the figure to take in the data and the control signal. In particular, when determining the products to be loaded on the pallet according to the type and quality of the product on the transport line of the factory, and switching the transport line after that, the information read from the data carrier may be about 1 byte. Based on the above, the control for allocating the transfer line is performed. In such a case, since there are a large number of distribution units, it is preferable that the lines can be switched with the simplest configuration possible. However, there is a drawback that the structure becomes complicated when a plurality of input units are used.

The present invention has been made in view of such conventional problems, and an object thereof is to reduce the number of data to be transmitted in parallel by transmitting the data in a time division manner.

[0007]

According to a first aspect of the present invention, an ID controller that reads data held in a data carrier and outputs the data, and a programmable logic that receives the data read by the ID controller. a data transmission device having a controller, wherein the ID controller includes a data holding means for temporarily holding the data read by communication with the data carrier, which is held in the data holding means Day
The bit width is smaller than the bit width of the
Data to send data to Mable Logic Controller
The data held in the data holding means is divided into data areas according to an output terminal and a data area switching signal input from the programmable logic controller , and the programmer is output via the data output terminal.
Data transmitting means for transmitting to the bull logic controller , and the programmable logic controller has switching signal output means for outputting the data area switching signal. The invention of claim 3 of the present application is held in a data carrier.
The data stored in the data carrier
To the ID controller and the ID controller
Connected to the data carrier without contacting the data carrier
ID series having a read / write head for writing and reading
And the ID controller is
Temporarily holds the data read by communicating with the carrier
Data holding means and the data holding means
It has a bit width smaller than the data bit width,
Data to send data to Mable Logic Controller
Output terminal and the programmable logic controller
Depending on the data area switching signal input from the
Data held in the data holding means for each data area
And the programmer through the data output terminal
Data transmission means to transmit to the bull logic controller
And are included.

According to the present invention having such characteristics,
The programmable logic controller outputs a switching signal for switching the area of the data read from the data carrier. The ID controller temporarily holds the data read from the data carrier by the data holding means, and transmits the data for each designated area by the data transmitting means. In this way, the data can be divided and transmitted, so that the number of data to be transmitted in parallel at the same time is reduced.

[0009]

1 is a block diagram showing the overall configuration of a data transmission apparatus according to an embodiment of the present invention. As shown in this figure, this data transmission device includes an ID controller and a programmable logic controller (PLC) of a higher level.
It is a device for transmitting data to and from. Also in this embodiment, the ID controller 10 includes a read / write head 11
Are connected and perform data transmission with the data carrier 12 that arrives in the vicinity of the read / write head 11. The ID controller 10 is a data holding means 10a for temporarily holding the data read from the data carrier,
And data transmission means 10 for dividing and transmitting this data
It has the function of b. The ID controller 10 is connected to the programmable logic controller main body 14 via an input unit 13 which is an input means of the programmable controller. The input unit 13 uses, for example, an 8-point input type, and receives and receives 4-bit data output, normal output (NORMAL), and error output (ERROR) signals from the ID controller 10. Programmable logic controller body 1
Reference numeral 4 has switching signal output means 14a for outputting an area switching signal via the output unit 15. Further, it has a function of outputting a trigger (TRIG) signal when operating in the trigger mode.

FIG. 2 is a block diagram showing details of the ID controller 10 and the read / write head 11. As shown in the figure, the ID controller 10 has a power supply circuit 21 connected to a power supply terminal, and power is supplied to each part. Further, the control circuit 22 accesses the data carrier 12 via the transmission antenna 24 and receives the signal from the data carrier 12 via the reception antenna 25 every time a periodic or trigger signal is input via the transmission circuit 23. Receiver circuit 2
6 is received. The data holding circuit 27 is a data holding means 10a for temporarily holding the received data of 1 or 2 bytes, for example. Further, the control circuit 22 divides the data held in the data holding circuit 27 so as to transmit the data for each data area according to the area switching signal,
The divided output is output to the programmable logic controller 14 via the output circuit 28. Here, the control circuit 22 and the output circuit 28 constitute a data transmitting means 10b for transmitting the data held in the data holding circuit 27 for each data area.

Next, the operation of this embodiment will be described with reference to the time chart of FIG. 3 and the flow charts of FIGS. First, in the auto mode, when the data carrier 12A arrives in the vicinity of the read / write head 11 of the ID controller 10 as shown in FIG. 1, communication is started with the data carrier 12A, and at the time when the data carrier 12A is detected. Finish communication. After the communication, the data carrier 12A remains in the communication area for a certain period of time, and then the data carrier 12A does not exist. Next, another data carrier 12B arrives and tries to communicate with the data carrier 12B, but the communication fails. If L is output from the programmable logic controller body 14 as an area switching signal, the upper 4 bits are selected, and if H is output, the lower 4 bits are selected.

In the flow chart of FIG. 4, ID
When the controller 10 is in the auto mode, step 31,
At 32, the arrival of the data carrier 12 is awaited. If the data carrier 12 is detected, the process proceeds from step 32 to step 33 to read the data at the predetermined address. Then, it is determined whether or not the data is normally read (step 34), and if there is an error, an error output is issued and the process returns to step 31 (step 35). If the data is normally read, the process proceeds to step 36 to read the area switching signal from the programmable logic controller 14 and output the data of this area (step 37). That is, the normally read 1-byte data is “10110001”.
Then, when the area switching signal is at the L level, the data is set to the upper 4 bits "1011" and a normal output is set. If the area switching signal is switched to the H level in step 38, the data output is switched to the lower 4 bits "0001" as shown in FIG. 3 (step 39) and the normal output is established. The data is transmitted to the programmable logic controller main body 14 on the assumption that the data has been established at the rising edge of the normal output.
In this way, data is output for the areas changed in steps 38 and 39, and if all the data areas have been completed, the processing ends. In this way, the programmable logic controller main body 1 can be operated from the ID controller 10
Data can be transmitted by reducing the number of data to be transmitted in parallel to four. Since normal communication could not be performed with respect to the data carrier 12B, an error output is output (step 35) and the processing is ended.

In the trigger input mode, as shown in the flowchart of FIG. 5, the data of the data carrier is read according to the trigger input from the programmable logic controller main body 14 and the data is transmitted for each divided area. Other operations are similar to those in the case of the auto mode described above.

In this embodiment, one byte of 8 bits of data is read from the data carrier and data is transmitted by dividing it into 4 bits, but continuous 2 bytes of data are read and 16 bits of data are read. Can be divided into four and transmitted.

In FIG. 6A, continuous 2-byte data is divided into four areas A, B, C and D for every 4 bits. Then, by making the area switching signal 2 bits, 16 bits are divided into four, and when the area switching signal is "00", the area of the most significant 4 bits A as shown in FIG. In areas "10" and "11", the 4 bits of the areas C and D are selectively output. In this way, data can be transmitted by dividing it into a plurality of bits.

In each of the above-mentioned embodiments, the data is transmitted by dividing the data every 4 bits.
It goes without saying that data may be transmitted for each other division. When transmitting 16 bits, it may be configured to transmit every 8 bits.

[0017]

As described above in detail, according to the present invention, the number of connection lines between the ID controller and the output of the programmable logic controller is greatly reduced, so that the number of input / output units can be reduced. Therefore, the effect that the price of the data transmission device can be kept to a minimum can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a data transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an ID controller used in this embodiment.

FIG. 3 is a time chart showing the operation of the present embodiment.

FIG. 4 is a flowchart (part 1) showing the operation of the ID controller of the present embodiment.

FIG. 5 is a flowchart (part 2) showing the operation of the ID controller of the present embodiment.

FIG. 6 is a conceptual diagram showing division of a data area and an area switching signal.

FIG. 7 is a block diagram showing a configuration of a conventional data transmission device.

FIG. 8 is a time chart showing the operation of a conventional data transmission device.

[Explanation of symbols]

10 ID controller 10a data holding means 10b data transmission means 11 read / write head 12,12A, 12B data carrier 13 Input unit 14 Programmable logic controller body 14a Switching signal output means 15 Output unit 21 Power circuit 22 Control circuit 23 Transmitter circuit 24 transmitting antenna 25 receiving antenna 26 Receiver circuit 27 Data holding circuit 28 Output circuit

Claims (3)

(57) [Claims] 1. A data transmission device having an ID controller for reading data held in a data carrier and outputting the data, and a programmable logic controller for receiving the data read by the ID controller, wherein the ID The controller has a data holding means for temporarily holding the data read by the communication with the data carrier, and a bit width of the data held in the data holding means.
Since it has a small bit width,
The data held in the data holding means is divided into data areas according to a data output terminal for transmitting data to the controller and a data area switching signal input from the programmable logic controller.
The programmable logic through the data output terminal
A data transmission device for transmitting to the controller , wherein the programmable logic controller has a switching signal output device for outputting the data area switching signal. 2. The ID controller is provided with the data key.
If the data is read normally from the carrier
Signal is generated and an error signal is output if the signal cannot be read normally.
To the programmable logic controller
The data transmission device according to claim 1, wherein the data transmission device is provided.
Place 3. Reading data held in a data carrier
I, which takes and outputs the data to the data carrier
D controller and the data carrier connected to the ID controller
A read / write head that writes and reads data without contacting
A ID system having a de, the ID controller, the data read by communication with the data carrier
From the data holding means for temporarily holding and the bit width of the data held in the data holding means
It has a small bit width and is programmable logic controller.
Data output terminal for sending data to the roller and input from the programmable logic controller
The data holding means according to the data area switching signal
The data stored in is divided into data areas and
The programmable logic through the data output terminal
Data transmission means for transmitting to the controller.
An ID system characterized by: