JPH0923240A - Data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transmitter by sending setting value information data of the transmitter connected to a bus with a simple configuration and obtaining the data easily. SOLUTION: The system employing transmitters is provided with transmitters 1-3 connected to a bus L and sending its own transmitter number to the bus L and an operation display device 4 receiving the transmitter number on the bus L. When the operation display device 4 has the setting value of the received transmitter number, the display device 4 sends the setting value to the transmitters 1-3 via the bus L or when the display device 4 does not have the setting value of the received transmitter number, the display device 4 sends a setting value request code to the transmitters 1-3 via the bus and receives the setting value sent by the transmitters 1-3 by their reply.

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 set values in a device for transmitting data such as 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.

Further, when a new device is connected to the transmission line, the contents of the set value of the device cannot be understood, and there is a possibility that inconvenience may occur.

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 transmitting setting value information data of a device connected to a bus and easily obtaining the data. is there.

[0006]

According to the present invention, there is provided a transmission device which is connected to a bus and transmits its own device number to the bus, and an operation display device which takes in the device number flowing through the bus. , If the set value for the imported device number is held, this set value is sent to the transmission device via the bus, or if the set value for the imported device number is not held, the transmission is performed. A data transmission device configured to transmit a setting value request code to a device via a bus and receive a setting value transmitted by the transmission device in response.

[0007]

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

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. 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 fetched by the output device 2 and the arithmetic device 3, the output device 2 and the arithmetic device 3 take the same number as the device number "01" of the input device 1 and obtain the input number " 01 ".

The output device 2 matches the input number “01” of the data flowing through the bus L and corresponds to the input device 1.
Only the data with the device number "01" is discriminated and selected, taken in, and output to the outside after predetermined processing.

Further, the arithmetic unit 3 outputs the input device 1 corresponding to the acquisition number “01” of the data flowing through the bus L.
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.

Further, a management operation display device 4 such as a personal computer is connected to the bus L, and the operation display device 4 displays the connection state and set values of each transmission device on the display means to display the entire system. We are grasping.

By the way, when a transmission device is added or replaced at the time of maintenance and inspection of the system or at the time of updating, what kind of set value parameter each transmission device should operate is displayed on the operation display device 4 or the like. There is something unknown.

That is, for example, it is assumed that the input device 1 as a transmission device is exchanged and connected to the bus L. Then
The input device 1 transmits the device number "01" and the connection code "C" peculiar to the device described below to the bus L by operating its operation means or the like.

Then, the operation display device 4 receives these information data, knows that the device number “01” is connected, and at the time of replacement, sets the set value for the imported device number “01”. When the device is held, the device number “01”, the set value code “S”, and the set value “XX” of the device are transmitted to the bus L as follows.

When 01 S XX, the input device 1 takes in this from the bus L and sets it as its own set value.

Alternatively, when the operation display device 4 does not hold the set value of the fetched device number "01", such as when changing the extension, the device number "01" is input to the input device 1 as follows. , And the set value request code “SR” is transmitted to the bus L.

01 SR Then, the input device 1 receives this and sets the following set value “YY” held by itself to the device number “0” of itself.
1 ”and the response code“ SA ”are transmitted to the bus L.

When 01 SA YY, the operation display device 4 receives these information data, can grasp the connection status of the connected device, the state of the set value parameter, and the like, and if necessary, the operation means. Can be operated to display the connection state of the transmission device, the contents thereof, etc. on the display means so that the operator can recognize it. Also, if a transmission device with a connection failure can be found, the necessary measures can be taken and the system operation can be performed well.

In the above example, the input device 1 is described as an example of the transmission device connected to the bus L, but the transmission device may be any of the output device 2 and the arithmetic device 3 other than this.

[0022]

As described above, according to the present invention, a transmission device which is connected to a bus and transmits its own device number to the bus,
An operation display device that captures the device number that flows on the bus is provided.If this operation display device has a set value for the captured device number, does this transmit the set value to the transmission device via the bus? Or, when the set value for the imported device number is not held, the set value request code is transmitted to the transmission device via the bus and the set value transmitted by the transmission device in response is received. It is a data transmission device. Therefore, the main master station is not required, the communication speed can be 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 the number allows. Is simple and arbitrary,
Moreover, it can be configured flexibly, and can easily and sufficiently cope with various systems, with high flexibility and expandability, effectively and efficiently. In addition, the operation display device transmits the setting values of the transmission device easily connected to the bus,
Or, it can be received and grasped as a whole, it is possible to know which device is connected, what kind of setting value operates, etc., and by displaying this, the operator can recognize it,
The necessary action can be taken and the system operation can be performed well.

[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 output device 3 arithmetic device 4 operation display device L bus

Claims (2)

[Claims] 1. A transmission device, which is connected to a bus to transmit its own device number to the bus, and an operation display device for taking in the device number flowing through the bus. The operation display device is set for the taken-in device number. A data transmission device characterized in that, when the value is held, the set value is transmitted to the transmission device via a bus. 2. A transmission device, which is connected to a bus and transmits its own device number to the bus, and an operation display device for capturing the device number flowing through the bus. The operation display device sets the captured device number. A data transmission device characterized in that, when it does not hold a value, it is configured to transmit a setting value request code to the transmission device via a bus and receive the setting value transmitted in response to the transmission device.