JPH0923239A - Data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recognize the status of the transmitter connected to a bus with a simple configuration by receiving a status request code on the bus, sending its own transmitter member to the bus and allowing an operation display section to fetch the transmitter number. SOLUTION: A management operation display device 4 such as a personal computer is connected to a bus L and a status request code to request a status to a transmitter connecting to, e.g. the bus request code is sent to the bus L by the operation display device 4. Each of transmitters 1-3 receives the status request code and when itself is in the operating state, the transmitter sends its own transmitter number and a status reply code to the bus L. The operation display device 4 receives the information data to detect how many transmitters and which transmitters are connected to the bus L based on the presence of the reply of the transmitter number. Then an operation means is operated as required and the connection state of the transmitter or the like is displayed on a display means so as to allow the operator to recognize it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for transmitting status in an apparatus 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, if many devices are connected to the transmission line, the connection state may not be known, which may cause inconvenience.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a data transmission device having a simple configuration and capable of transmitting the status of a device connected to a bus and easily knowing the status.

[0006]

SUMMARY OF THE INVENTION According to the present invention, an operation display device for transmitting a status request code for making a status request to a transmission device connected to a bus, and a status display code for receiving a status request code flowing through the bus. And a transmission device adapted to transmit the device number of No. 1 to the bus and to be taken in by the operation display device.

[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.

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,
Sometimes the status of which transmission device is operational is unknown.

That is, a management operation display device 4 such as a personal computer is connected to the bus L, and this operation display device 4 is connected.
Then, for example, the following status request code "S" for making a status request to the transmission device connected to the bus L
R "to bus L.

Then, each of the transmission devices 1, 2 and 3 receives this status request code "SR" and, if it is operating, sends its own device number to the bus L. For example, if the device number of the input device 1 is “01”, the device number of the output device 2 is “02”, and the device number of the arithmetic unit 3 is “03”, the status response code “SA Is transmitted to the bus L.

01 SA or 02 SA, ... Then, the operation display device 4 receives these information data, and depending on the presence or absence of the reply of the device number, how many transmission devices are connected to the bus L. You can detect and know if there is. If necessary, the operating means can be operated to display the connection state 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.

The information data transmitted from each of the transmission devices 1, 2, and 3 to the operation display device 4 includes, in addition to the above device number, a model number indicating the type and model of the device (for example, "F1").
2 ”), alarm information (for example,“ AR2 ”), operation information (for example,“ RUN ”if operable), and the like.
Individual pieces may be combined and transmitted as follows.

01 SA F12 AR2 RUN With this, the state of the device connected to the bus L can be grasped in more detail. Further, the status request and response may be carried out not only at the time of start-up, but also periodically or as needed to grasp the status state.

[0019]

As described above, according to the present invention, the operation display device for transmitting the status request code for making a status request to the transmission device connected to the bus and the status request code flowing through the bus are received. And a transmission device adapted to transmit its own device number to the bus and capture it in the operation display device.
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. Further, in the operation display device, the status state of the transmission device easily connected to the bus can be grasped as a whole at once, and it is possible to know how many and which device is in the connected state. The operator can recognize the information by displaying it, take necessary measures, and properly start up the system.

[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 (1)

[Claims] 1. An operation display device for transmitting to the bus a status request code for making a status request to a transmission device connected to the bus, and a status request code flowing through the bus to transmit its own device number to the bus. A data transmission device, comprising: a transmission device adapted to be taken into an operation display device.