JPH09205449A - Data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flexible data transmitter not needing a master station by providing a management equipment making a state request to plural transmitters connecting to a bus and a transmitter delaying status data depending on its own equipment number by a prescribed time and leading the delayed data to the management equipment. SOLUTION: In the case of receiving data from an entry device 1 by an output device 2 and an arithmetic unit 3. The same number as an equipment number '01' of the entry device 1 is set to the output device 2 and the arithmetic unit 3. The output device 2 discriminates and selects only data whose equipment number is coincident with the number '01' among data flowing to a bus L and receives the selected data and provides an output of the data to an external device after the processing. The arithmetic unit 3 receives the data whose equipment number is coincident with the number '01' among data flowing to the bus L, applies arithmetic operations required such as averaging, gives a specific number '03' and provides an output of it to the bus L. A management equipment 4 like an operation display device for a personal computer or the like is connected to the bus L and sends a signal for a state request to the bus L toward each transmitter connecting to the bus. Each transmitter receives the signal and sends the status data or the like to the bus L.

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 this polling method, since a master station is always required and a polling signal is always required, the apparatus is complicated, the response takes time, and the communication speed is insufficient. There is. In addition, if many devices are connected to the transmission line, the overall connection state cannot be understood, and if the user tries to construct a connection state diagram by referring to a configuration specification prepared in advance, the operation becomes complicated. There was a risk of misconfiguration and inconvenience.
Also, if data is collected in an attempt to automatically construct a connection state diagram, there is a risk of interference.

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 easily transmitting and receiving the status data of the device connected to the bus without interference.

[0005]

According to the present invention, there is provided a management device for transmitting a status data request code for making a status request to a plurality of transmission devices connected to a bus, and a status data request code flowing through the bus. The data transmission device is provided with a transmission device that receives the data, delays it for a predetermined time determined by its own device number, transmits the status data to the bus, and causes the management device to capture the status data.

[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, an input device 1, an output device 2, an arithmetic device 3, and the like as a transmission device are connected to a bus L such as a common network as a transmission line. The output device 2, ..., the arithmetic device 3,
, Etc. constitute the capturing device. 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.

Then, of the data flowing on the bus L, the output device 2 and the arithmetic device 3 take in the necessary data. For this reason, these capture devices include:
A device number assigned to output data of an input device or the like required by the capture device is set in advance as a capture number depending on which input device or the like needs output data.

For example, assuming that 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 take in the same number as the device number "01" of the input device 1. 01 ”is set.

The output device 2 corresponds to the input device 1 corresponding to the take-in number "01" of the data flowing on the bus L.
Only the data with the device number "01" is discriminated and selected, taken in, and output to the outside after predetermined processing.

In the arithmetic unit 3, the input unit 1 of the data flowing through the bus L, which coincides with the fetch number "01", is input.
Only the data with the device number “01” is selected, determined and imported. Then, after performing other necessary calculations such as averaging, the unique device number “03” of the arithmetic unit 3 is added to the data.
And output to the bus L.

By the way, if many of these transmission devices are connected to the bus L at the time of start-up or after maintenance and inspection,
It is necessary to know what kind of transmission device and how it is connected.

That is, a management device 4 such as an operation display device such as a personal computer is connected to the bus L, and this management device 4
Then, for example, the following state data request code SR for making a state request to each transmission device connected to the bus L is transmitted to the bus L.

Then, each of the transmission devices 1, 2, 3 ... Receives the status data request code SR, and includes the following data including the status data response code SA, the device numbers 01, 02, 03 ,. Such state data is transmitted to the bus L, and the management device 4 receives it. The status data response code can be omitted.

Input device 1: SA 01 INPUT ... Output device 2: SA 02 OUTPUT ... Arithmetic device 3: SA 02 AVE ... Then, the management device 4 receives these status data,
Depending on the presence or absence of the device number response, it is possible to detect and know how many transmission devices are connected to the bus L. Then, if necessary, operate the operating means,
It is possible to automatically display a connection state diagram of the transmission device on the display means so that the operator can recognize it. If a transmission device having a connection failure can be found, necessary measures can be taken, and the system can be started up satisfactorily.

By the way, if status data as a response is transmitted from the respective transmission devices to the management device 4 all at once on the bus L, the management device 4 cannot process at the same time, resulting in interference and malfunction. Therefore, each of the plurality of transmission devices
When the status data request code SR is received, the status data is not immediately transmitted at the same time, but is delayed by mutually different predetermined times so that the status data is transmitted to the bus L and captured by the management device 4, thereby preventing interference.

For example, the status data is transmitted to the bus and delayed by the predetermined time determined by the own device number, and is taken into the management device 4. That is, if the management device 4 fetches the state data and the time required for processing is T, the delay time that each transmission device delays and transmits to the bus L is as follows.

Input device 1: 1 · T Output device 2: 2 · T Arithmetic device 3: 3 · T Transmission device N: N · T ……… In other words, status data at different time intervals of, for example, time T Flows through the bus L, the management device 4 has a simple configuration.
Can easily capture the status data of the transmission device connected to the bus L with sufficient margin without interference.
The setting of the delay time of the transmission device is not limited to the above,
It can be set in various ways.

[0019]

As described above, according to the present invention, a management device for transmitting a status data request code for making a status request to a plurality of transmission devices connected to a bus, and a status data request flowing through the bus. The data transmission device is provided with a transmission device which receives a code, delays a predetermined time determined by its own device number, transmits state data to a bus, and stores it in a management device. 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. What
It can be configured simply, arbitrarily, and flexibly, and can easily and sufficiently respond to various systems with excellent flexibility and expandability, and effectively and efficiently. Also,
Since the management device can easily obtain the status data of the transmission device connected to the bus and automatically generate and display the connection status diagram of each device, the overall connection status of each device can be grasped at once. Therefore, the system can be started up satisfactorily. In other words, since the status data is sent from each device, even if the operator does not know what specifications each device has, even if there is no construction specification, how many What kind of connection status, etc.
You can know it without the construction specifications and construction operation. Furthermore,
The operator can easily recognize the accurate overall configuration without the need to construct the system by himself, and can immediately take necessary measures for abnormalities, etc., and can properly start up the system. Further, since the status data is transmitted to the bus and flows at different time intervals, the management device can easily take in the status data of the transmission device connected to the bus without interference, with a simple configuration. In particular, when the transmission device transmits the status data to the bus with a delay of a predetermined time determined by its own device number, the transmission interval of a large number of transmission data can be determined by a simple rule, and the management device further interferes with the status data. You can easily send and receive without doing.

[Brief description of drawings]

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

[Explanation of symbols]

 Reference Signs List 1 input device 2 output device 3 arithmetic device 4 management device L bus

Claims (2)

[Claims] 1. A management device for transmitting a status data request code for making a status request to a plurality of transmission devices connected to the bus, and a status data request code flowing through the bus for delaying the predetermined time different from each other. And a plurality of transmission devices adapted to transmit the status data to the bus and to be taken in by the management device. 2. The data transmission device according to claim 1, wherein said transmission device transmits the status data to the bus with a delay of a predetermined time determined by its own device number.