JPH09121220A - Data transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor the connection state of a bus by providing a transmitter periodically outputting the device number of its own device and the operating state code, etc., to a bus and a controller receiving the device number and the operating state code flowing in the bus and monitoring the operation of the transmitter connected with the bus. SOLUTION: Transmitters 1 to 3 transmit the device numbers of their own devices and normal codes A1 and A2, etc., indicating that their own devices rightly operate if their own devices are operating or the device numbers of their own devices and abnormal codes B1 and B2, etc., indicating abnormalities if the devices are abnormal to a bus L, in addition to normal processings. For instance, if the device number of an input device 1 is defined as 01, the device number of an output device is defined as 02 and the device number of an arithmetic device 3 is defined as 03, messages of 01 and A1 in normal circumstances and 03, B1 and B2 in abnormal circumstances are transmitted to the bus L. As a result, a controller 4 receives these messages, detects which transmitter of the device number connected with the bus L is abnormal and is capable of monitoring the transmitter.

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 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.

Further, when many devices are connected to a transmission line, the operating state of which device is operating normally may not be known, which may cause inconvenience.

An object of the present invention is to provide a data transmission device that can easily know the operation state of a device connected to a bus with a simple configuration in view of the above points.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a transmission device which periodically outputs its own device number and operation status code to a bus and a transmission device which receives the device number and operation status code flowing through the bus and connects them to the bus. The transmission device is provided with a management device that monitors the operating state of the device.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing the configuration of 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,. 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, many of these transmission devices are connected to a bus L.
Connected to the, it is unknown which transmission device is operating correctly, and if it is abnormal, it is necessary to know which device is abnormal and what part of the device is abnormal. is there.

In other words, the management device 4 for management such as a personal computer is connected to the bus L, monitors the operation state of each transmission device, displays it on the display device as needed, and displays an abnormal operation that is not operating. When the device is found, it is necessary to take necessary measures by displaying it on a display device or issuing an alarm to the outside.

Therefore, each of the transmission devices 1, 2, and 3 has a normal code "A1" indicating that it is operating properly along with its own device number if it is operating, along with normal processing. "A2" or the like, or if it is abnormal, transmits the abnormal code "B1", "B2" or the like indicating the abnormality to the bus L together with its own device number. For example, assuming that 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 message of the device number and the operation state code is as follows. Is transmitted to the bus L.

Normal time: 01 A1 Abnormal time: 03 B1 B2 Then, the management device 4 receives these information data,
It is possible to detect and monitor the operating state of which device number of the transmission device connected to the bus L is abnormal. Then, if necessary, it is possible to display the operation state of the transmission device on the display device so that the operator can recognize it. If an abnormal transmission device can be found, necessary measures can be taken.

Further, by using a plurality of types by distinguishing the abnormal code into "B1", "B2", etc. according to the type of abnormality, etc.
It is possible to identify what kind of abnormality, and by identifying a plurality of types of abnormalities, which part of the apparatus is abnormal can be identified, and more detailed self-diagnosis and abnormality alarm processing can be performed.

[0018]

As described above, according to the present invention, a transmission device that periodically outputs its own device number and operation status code to the bus, and a device number and operation status code that flow on the bus are connected to the bus. And a management device that monitors the operating state of the transmission device. For this reason,
There is no need for a main station, and the communication speed can be sufficiently high. From a configuration consisting of a minimum of two devices and a bus, a combination of dozens or hundreds of data and devices as far as the numbers permit. , Simple and arbitrarily, and can be configured flexibly, and easily and sufficiently with various systems, flexibility,
It is highly scalable and can respond effectively and efficiently. In addition, the management device can easily grasp the operating status of the transmission devices connected to the bus all at once, and determine how many and which devices are in a normal state or in an abnormal state. It is possible to know the information, display an abnormality and give an alarm to the outside, the operator can easily recognize it, take necessary measures, and execute the system satisfactorily. Further, by distinguishing the abnormal code according to the type of abnormality, it is possible to identify which part of the transmission device is the abnormal state, and more detailed self-diagnosis and abnormal alarm processing can be performed.

[Brief description of the 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 (1)

[Claims] 1. A transmission device that periodically outputs its own device number and operation status code to a bus, and monitors the operation status of a transmission device that receives the device number and operation status code flowing through the bus and connects to the bus. A data transmission device comprising a management device.