JPH098830A - Data transmission device - Google Patents

Abstract

PURPOSE: To individually take in plural data outputs in another transmission device and to provide considerable extendability and flexibility by adding different device numbers to the plural data outputs of a transmission device, which are outputted to a data bus. CONSTITUTION: An input device 1 being the transmission device, an arithmetic unit 2 and output devices 31, 32 and 33 having at least one device number of the transmission device as a take-in number are connected to the bus L as a common transmission line. When respective data of a mean value, a maximum value and a minimum value which are obtained by an arithmetic processing by the arithmetic unit 2 are allocated to each individual output device 31, 32 and 33 and are outputted, for example, the plural arithmetic units are considered to virtually exist and the different device numbers are added to respective data are outputted to the bus L. The respective output devices 31, 32 and 33 fetch only the data of the fetch number allocated to the self device and output the mean value, the maximum value and the minimum value to an external part. Furthermore, the plural fetch numbers can be provided for one output device and plural data can be fetched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting data such as a process amount.

[0002]

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

[0003]

However, in the polling method, the master station is always required and the polling signal is always required, so that the apparatus is complicated, the response takes time, 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 effectively performing transmission between devices connected to a bus.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a transmission device for transmitting a plurality of data to a bus with different device numbers, and at least one device number of the transmission device is a take-in number. It is a data transmission device including another transmission device that receives data to which a device number is attached from a bus.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural explanatory view showing an embodiment of the present invention. In FIG. 1, a bus L such as a common network serving as a transmission line is provided with, for example, an input device 1, a computing device 2, and output devices 31, 32, 3 as transmission devices.
3 etc. are connected. Then, the arithmetic unit 2, the output unit 31, ... Each of these devices is assigned a device number unique to the device, and data and the like can be transmitted using this device number.

The analog signal data such as the temperature input to the input device 1 is given a unique device number of the input device 1 after being subjected to necessary processing such as linearization, and is output to the bus L as output data. Is output.

Of the data flowing on the bus L in this way, necessary data is output from the arithmetic unit 2 and the output unit 3.
1, ... will be taken in. Therefore, depending on which input device or other output data is required for these capture devices, the device number assigned to the output data of the input device or the like required by that capture device is preset as the capture number. I'll do it.

For example, if the data of the input device 1 is taken in by the arithmetic device 2, the arithmetic device 2 sets the same number as the device number "01" of the input device 1 as the take-in number "01".

The arithmetic unit 2 selects, discriminates and fetches only the data having the device number "01" of the input device 1 which matches the fetching number "01" among the data flowing on the bus L. Then, after performing necessary arithmetic operations such as an average value, a maximum value and a minimum value, the data is given a unique device number of the arithmetic device 2 and output to the bus L.

At this time, it is assumed that the average value, the maximum value, and the minimum value data obtained by the arithmetic processing in the arithmetic unit 2 are to be assigned to the respective output units 31, 32, 33 and outputted. In this case, if the acquisition numbers of the output devices 31, 32, and 33 are set to the acquisition number “02” of the arithmetic unit 2, the data cannot be distinguished.

Therefore, the arithmetic unit 2 as a transmission device
For example, when transmitting the captured data as it is to the bus, the device number "02" is added, "03" is the average value of some data, "04" is the maximum value, and the minimum value is "04". Is added to "05" and output to the bus L. There are virtually a plurality of arithmetic devices, each device is given a different device number, and is transmitted and output to the bus L.

The output device 3 as another transmission device
If the capture number of 1 is “03”, the capture number of the output device 32 is “04”, and the capture number of the output device 33 is “05”, then the output devices 31, 32, and 33 are the same as the arithmetic unit 2. Of the data output to the bus L by the device number "03", "0"
The data of the average value, the maximum value, and the minimum value, to which “4” and “05” are added, can be taken in and output to the outside. Further, one output device may be provided with a plurality of capture numbers to capture a plurality of data.

Although the arithmetic unit and the output unit have been described above as examples, the present invention is not limited to these as long as they are devices connected to the bus L and transmitting and receiving via the device number.
Anything is fine.

[0015]

As described above, according to the present invention, a transmission device for transmitting a plurality of data to a bus by assigning different device numbers to each other, and at least one device number of the transmission device is a take-in number. The data transmission device is provided with another transmission device that receives and takes in the data to which the device number is attached from the bus. Therefore, the main master station is unnecessary,
The communication speed can be sufficiently high, and from the configuration of only a minimum of two devices and a bus, as long as the number allows, a combination of dozens or hundreds of data and devices can be easily and arbitrarily set It can be configured flexibly, and it can respond to various systems easily, sufficiently, with flexibility, expandability, effectively and efficiently. In addition, each data of the transmission device that outputs the data to the bus is virtually assigned a different device number, transmitted and output to the bus, and can be received and captured by another different transmission device. It is not necessary to add a transmission device for transmission output, and only by adjusting and setting the device number, it is possible to have great expandability and flexibility, and with a simple configuration, between devices connected to the bus. Transmission can be performed flexibly and effectively.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

[Explanation of symbols]

 1 input device 2 arithmetic device 31, 32, 33 output device L bus

Claims (1)

[Claims] 1. A transmission device for transmitting a plurality of data to a bus by assigning different device numbers to the bus, and at least one device number of this transmission device is taken as an acquisition number, and data having this device number is assigned. A data transmission device comprising: another transmission device that receives and takes in from a bus.