JPH08314868A - Data transmitter - Google Patents

Abstract

PURPOSE: To provide a data transmitter capable of adjusting a data output time interval by a simple configuration. CONSTITUTION: An input device 1 adds a device number to inputted data and outputs them to a bus L. An output device 2 or an arithmetic device 3 fetches the required data to which the device number is added among the data flowing through a first bus L. Then, an operation display device 4 as a setting device transmits a data output time interval setting code to which the device number of a device defined as a target is added and a data output time interval setting value to the bus L. Respective transmitters 1 to 3 as the devices to be set receive the data output time interval setting code to which their own device numbers are added and the time interval setting value flowing through the bus and output the data with the time interval.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for setting a data output time interval in a 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.

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

The output time interval of the data transmitted to the bus by each device connected to the network bus is usually set to a predetermined time.

[0005]

However, if the output time interval of each device connected to the bus is fixed, useless time may occur depending on the traffic density on the bus, and conversely data may be exchanged. There is a problem that the collisions make transmission difficult.

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 adjusting a data output time interval.

[0007]

According to the present invention, there is provided a setting device for transmitting a data output time interval setting code having a device number of a target device and a data output time interval setting value to a bus, and a device for transmitting data flowing through the bus. A data transmission device comprising a data output time interval setting code having its own device number and a data output time interval setting value, and a set device for outputting data to a bus at the time interval. .

[0008]

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 as a transmission line is connected with, for example, input devices 1 ..., Output devices 2 ..., Arithmetic devices 3, ... As transmission devices. The output device 2, ..., the arithmetic device 3,
, Etc. constitute the capturing device. A device number unique to the device is attached to each of these devices, and data or the like can be transmitted using this device number.

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

Of the data flowing on the bus L in this way, the output device 2 and the arithmetic device 3 take in the necessary data. Therefore, these capture devices have
Depending on which input device or arithmetic device data is required, the device number of the output data of the input device or arithmetic device required by the capture device is set in advance as the capture number.

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 device 1 which matches the fetching number from the data flowing through 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.

The time interval at which these transmission devices output data to the bus L is a predetermined time interval depending on the degree of data congestion, traffic density, etc., depending on the number of transmission devices connected to the bus L. Alternatively, the values are set to different values depending on the characteristics such as the data update cycle of each transmission device and the processing speed.

An operation display device 4 as a setting device is connected to the bus L, receives data flowing on the bus L,
The obtained data information can be displayed on the display means (not shown) of the operation display device 4, and can be operated by an operation means (not shown) to take appropriate measures.

By the way, when the number of transmission devices connected to the bus L changes, or when the data update cycle of each transmission device changes and the congestion degree of data flowing through the bus L and the traffic density change, it is sufficient. It may not be possible to send and receive necessary data. In this case, the operation display device 4 as the data output time interval setting device has the data output time interval setting code “T” and the data output time interval setting value “T” with the device number “03” of the target transmission device. 3000 "(the data output time interval is 3000 ms
The following message output consisting of the following) is transmitted to the bus L.

T 03 3000 The data output time interval setting code and the data output time interval setting value which are output from the operation display device 4 as the setting device and flow on the bus L with the device number are set as the targets. The newly set 3000 ms received by the arithmetic unit 3 which is a transmission device as the set device.
The data is output at the time interval interval of.
In addition, when all transmission devices connected to the bus L are targeted, a specific device number is changed to "00", and the following message output meaning all transmission devices is operated as a setting device. The display device 4 transmits to the bus L.

T 00 3000 This information is received by all the transmission devices as the settable devices, and the data is output at the time interval of 3000 ms. In addition, the data output time interval may be set using a group number that specifies a group for some transmission devices. For example, the number "30" is "30-3.
It corresponds to the device number "9".

[0019]

As described above, according to the present invention, the data output time interval setting code with the device number of the target device and the setting device for transmitting the data output time interval to the bus, and the self-flowing device that flows through the bus. The data output time interval setting code and the data output time interval setting value to which the device number is attached, and the set device which outputs the data at the time interval.
Therefore, the main main station is not required, the communication speed can be sufficiently high, and the configuration with 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 configured easily, arbitrarily, and flexibly, and it is easy and sufficient for various systems, and it is rich in flexibility and expandability. Can respond effectively and efficiently. Also, since the target data output time interval of any transmission device can be set by the setting device, the number of transmission devices connected to the bus changes or the data update cycle of each transmission device changes and Even if the congestion level / traffic density of the flowing data changes, the data can be output at the optimum data output time interval, resulting in wasted time depending on the traffic density on the bus, and vice versa. There is no fear that transmission will be difficult due to collisions, and the data output time interval can be adjusted with a simple configuration.

[Brief description of drawings]

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

[Explanation of symbols]

 1 input device 2 output device 3 arithmetic device 4 operation display device L bus

Claims (1)

[Claims] 1. A setting device for transmitting a data output time interval setting code and a data output time interval setting value with a device number of a target device to a bus, and an own device number of data flowing through the bus. And a device to be set which receives the data output time interval setting code and the data output time interval setting value and outputs data to the bus at the time interval.