JPH08228198A - Data transmitter - Google Patents

Abstract

PURPOSE: To transmit plural data with simple constitution. CONSTITUTION: An input device 1 attaches an equipment number and one data number to the inputted data and outputs them to a bus L. An output device 2 or arithmetic units 3 and 4 fetch the data to which the equipment number to be required is attached among the data flowing through the bus L. An operation display device 5 transmits one group number for indicating the plural equipment numbers and a request code to the bus and receives the data from plural equipments corresponding to it.

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 for transmitting data such as a process amount.

[0002]

2. Description of the Related Art Conventionally, as a data transmission system, process data such as temperature collected by a slave station is transmitted to the master station via a transmission line by the slave station in response to a polling signal from the master station, and the data taken in by the master station is transferred. After the processing, there is a polling method in which another slave station transmits the polling signal again.

[0003]

However, in the polling system, since the main station is always required and the polling signal is always required, the device is complicated, and it takes a long time to respond and the communication speed is insufficient. is there.

In view of the above points, an object of the present invention is to provide a data transmission device having a simple structure and capable of flexibly and efficiently transmitting a large amount of data.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a plurality of devices that form a group on a network and output data to a bus with a device number unique to each device, and a group number indicating a group for this group. And another device for transmitting the request code to the bus and receiving data from a plurality of devices belonging to this group.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural explanatory view showing an embodiment of the present invention. In FIG. 1, for example, a plurality of input devices 1, ..., A plurality of output devices 2, ..., A plurality of arithmetic devices 3, 4, ... Are provided on a bus L such as a common network as a transmission line.
Etc. are connected. Then, the output device 2, ..., The arithmetic devices 3, 4, ... A device number unique to the device is attached to each of these devices, and a group is configured on the network according to the continuous device number or the type of the device.

The data such as the temperature input to the input device 1 is output to the bus L after being subjected to necessary processing such as linearization, with the device number unique to the input device 1.

Of the data flowing on the bus L, necessary data is output from the output device 2, the arithmetic unit 3,
4 will be taken in. Therefore, depending on which input device or arithmetic device data is required for these capture devices, the device number of the output data of the input device or arithmetic device required by the capture device is set as the capture number. Set in advance.

For example, if the data of the input device 1 is taken in by the output device 2 and the arithmetic device 3, the output device 2 and the arithmetic device 3 set the same number as the device number of the input device 1 as the take-in number. deep.

Of the data flowing through the bus L, the output device 2 discriminates and selects only the data having the device number of the corresponding input device 1 which coincides with the data acquisition number, fetches the data, and outputs the data after predetermined processing. .

Further, the arithmetic unit 3 selects, discriminates and fetches only the data having the device number of the input unit 1 which coincides with the fetch number from the data flowing on the bus L. Then, after performing other necessary arithmetic operations such as averaging, the data is given a unique device number of the arithmetic device 3 and output to the bus L.

By setting the device number of the arithmetic device 3 as the acquisition number of the arithmetic device 4, the arithmetic device 3
The output data of is captured by the arithmetic unit 4. And
The arithmetic unit 4 performs a predetermined arithmetic processing again, and outputs this data to the bus L with a unique device number of the arithmetic unit 4.

If two or more types of capture numbers are set in the arithmetic devices 3 and 4, various arithmetic processing can be performed on data from two or more types of devices.

In order to collect information such as data of the various devices 1, 2, 3, 4, ... Connected to the bus L on the operation display device 5 as another device, the device number and the data for each device are collected. The request code may be transmitted to the bus L, and the data may be received from the corresponding device and used. For example, if the device number of one device to be acquired is “01” and the data request code is D, the following message output is transmitted from the operation display device 5 to the bus L.

01 D Then, the response code is set to R, and from the device with the device number 01,
The following response is output and received by the operation display device 5 and can be used in various ways.

01 R 300 ° C. Further, in order to collect data and the like from a plurality of devices, one group number indicating a plurality of device numbers should be transmitted to the bus L and data from a corresponding plurality of devices should be received. To
That is, for example, the following rules are set so that each device number corresponds to a group number.

Group number 000 = All device numbers Group number 010 = Device number 00-09 Group number 011 = Device number 10-19 Group number 012 = Device number 20-29 ... Group number 020 = Whole input device group number 030 = Overall output device Group number 040 = Overall arithmetic device ... In other words, when the operation display device 5 transmits the group number "010" to the bus L together with the data request code D, ten device numbers "00 to 09" are output. Can receive predetermined data from. When the group number “020” is transmitted to the bus L together with the data request code D, the input device 1
.. is designated, and predetermined data can be received from each input device 1. That is, the following is output to the bus L, and a response such as data or information with a device number unique to the device is obtained from the corresponding devices belonging to the group.

010 D 020 D As described above, the group number indicates a plurality of consecutive device numbers or a plurality of device numbers of the same type such as an input device, or the type of physical quantity handled such as temperature, pressure and flow rate. , Or a device installation location / area, etc., as long as a plurality of devices can be designated as a group. In addition, according to the required information on the operation display device 5,
By changing the request code to be added, it is possible to collect various data and information about the required device. Then, the operation display device 5 acquires the status of each device, setting conditions, real-time data, etc., displays them on the screen of the display unit, and manages them or gives commands necessary for the devices required by the operating means. Can be sent.

Next, FIG. 2 shows a slightly detailed configuration explanatory diagram. For example, the input device 1 includes analog signals e1, e2, which are captured by an input switching device 1a such as a scanner.
... When outputting a plurality of data of en, each analog data is converted into a digital signal by the AD converter 1b, a predetermined process is performed by the processing means 1c, and a device number unique to the device is set by the number setting device 1e. However, this device number can be attached to the data and output to the bus L by the output means 1d.
A plurality of the input devices 1 are provided.

The operation display device 5 such as a personal computer outputs the required group number and request code from the output means 5f to the bus L at all times or at the time of start-up or when necessary.
Output to. When this designates the entire input device, a plurality of input devices 1 and the like which have received this output the device number unique to each device and information such as data to the bus L. Then, the operation display device 5 takes in information such as the device number and data by the taking-in means 5a. Further, the captured information and the like is stored in the memory 5c via the processing means 5b,
Various operations can be performed by the operation means 5e by displaying on the display means 5d or by referring to this display screen.

As other devices, in addition to the operation display device 5, for example, in the input devices such as the output device 1 and the arithmetic devices 3 and 4, the necessary group number and request code are transmitted to the bus L. For example, a plurality of data may be obtained from a plurality of input devices 1 or the like.

[0022]

As described above, the present invention is a data transmission device adapted to transmit a representative group number indicating a plurality of device numbers and a request code to a bus and receive data from a plurality of devices. . For this reason, the main master station is not required, the communication speed can be made sufficiently high, and the configuration with only a minimum of two devices and a bus can combine dozens or hundreds of data and devices as long as the number allows. It can be configured easily, arbitrarily, and flexibly, and can easily and sufficiently cope with various systems, being highly flexible and expandable, effectively and efficiently. Further, since one group number can be transmitted to the bus and data from a plurality of devices can be received, it is possible to obtain data and information only from a specific plurality of devices accurately and effectively, and to always obtain all the data. Compared to the case of specifying the device, the bus line is congested, unnecessary data is not received, unnecessary data processing is not performed, various processing is not inconvenient, and quick data Transmission and processing are possible.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

FIG. 2 is a structural explanatory view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Input device 2 Output device 3, 4 Arithmetic device 5 Operation display device L bus

Claims (2)

[Claims] 1. A plurality of devices forming a group on a network and outputting data to a bus by adding a device number specific to each device, and a group number indicating a group for this group and a request code by a bus. And another device for transmitting data to and receiving data from a plurality of devices belonging to this group. 2. The data transmission device according to claim 1, wherein the group number indicates a plurality of consecutive device numbers or a plurality of device numbers of the same type.