JPH09204220A - Equipment diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an equipment diagnostic device capable of connecting multiple sensors at a low cost by providing the respective sensors and job site controllers to which the sensors are connected, and executing connection with a central controller by means of a network cable. SOLUTION: The outputs of the job controllers 6a-6c are respectively connected to the network cable 12 and the central controller 5 is connected to one end of the network cable. Then, the respective outputs of an acoustic sensor 7, an acceleration sensor 8 and a switch circuit 9 are converted into digital signals by the job site controller 6a and arithmetically processed and its result is transmitted to the central controller 5. When abnormality, etc., occurs by comparing it with a previously set threshold value, an alarm signal is transmitted to the central controller 5. In a same way, the job site controllers 6b and 6c process the outputs of the respective sensors and transmit the results to the central controller 5. Then, the central controller 5 displays data transmitted from the job site controllers 6a-6c as a trend and also preserves it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equipment diagnostic apparatus for diagnosing equipment abnormality based on the outputs of various sensors installed in the field, and more particularly to an equipment diagnostic apparatus which can connect many sensors at low cost.

[0002]

2. Description of the Related Art A conventional equipment diagnosing device fetches the outputs of various sensors installed on site into a control device and diagnoses the equipment for abnormalities on the basis of variations in the outputs of the sensors. FIG. 2 is a configuration block diagram showing an example of such a conventional equipment diagnostic apparatus.

In FIG. 2, 1 is a control device such as a computer, 2 is an input device, 3a, 3b, 3c, 4a, 4b, 4
c and 4d are various sensors. Further, 50 and 51 indicate different sites where the sensor is installed.

Sensors 3a, 3b and 3c are installed on site 50, and sensors 4a, 4b, 4c and 4 are installed on site 51.
d is installed.

The outputs of the sensors 3a to 4d are connected to the input device 2, and the output of the input device 2 is connected to the control device 1.

Here, the operation of the conventional example shown in FIG. 2 will be described. Data is sequentially sent to the input device 2 from the sensors 3a to 4d installed at each site. The input device 2 converts the input data into a data format that can be taken in by the control device 1 by converting it into a digital signal.

The control device 1 takes in data from the input device 2, judges the abnormality of the equipment by comparing it with a preset threshold value, and informs the monitoring worker of the abnormality.

[0008]

However, in the conventional example shown in FIG. 2, since the outputs from various sensors are all connected to the input device 2, if the number of sensors is increased for more detailed equipment diagnosis. The wiring cost will increase.

Further, since the distance between the site and the place where the control device 1 is installed is generally large, the wiring length to be connected becomes long and it is difficult to transmit a high-speed signal.

Further, since the noise environment in the field is generally severe, it is necessary to use an expensive cable having good noise resistance as a cable used for wiring, which causes a problem of cost increase.

On the other hand, in the conventional example shown in FIG. 2, since the control device 1 processes all outputs from various sensors, the number of sensors that can be connected is limited depending on the processing capacity of the control device 1. There are also problems. Therefore, the problem to be solved by the present invention is to realize an equipment diagnostic apparatus that is low in cost and capable of connecting many sensors.

[0012]

In order to achieve such a problem, according to the first aspect of the present invention, an equipment diagnostic apparatus for diagnosing equipment abnormality based on outputs of various sensors installed in the equipment is installed in the equipment. Sensor, a field controller arranged near the equipment and processing and outputting the output of the sensor, a central controller for diagnosing the equipment based on the output of the present controller, and the central controller And a network cable for connecting the on-site control device to the on-site control device.

A second aspect of the present invention is characterized in that an acoustic sensor, an acceleration sensor and a camera are used as the sensors in the first aspect of the present invention.

A third aspect of the present invention is characterized in that the first aspect of the present invention is provided with a field control device for determining an abnormality based on the output of the sensor and transmitting an alarm signal to the central control device. is there.

A fourth aspect of the present invention is characterized in that the first aspect of the present invention is provided with a field control device for setting a sampling cycle based on the output of the sensor.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the equipment diagnosis apparatus according to the present invention.

In FIG. 1, reference numeral 5 is a central control unit, 6a, 6
b and 6c are on-site control devices, 7 is an acoustic sensor, 8 is an acceleration sensor, 9 is a switch circuit, 10 is a camera, 11a,
11b, 11c, 11d and 11e are other sensors,
12 is a network cable such as Ethernet.

The outputs of the acoustic sensor 7, the acceleration sensor 8 and the switch circuit 9 are connected to the on-site control device 6a, and the outputs of the camera 10 and the sensors 11a and 11b are connected to the on-site control device 6b. In addition, the sensors 11c to 11
The output of e is connected to the field controller 6c.

The outputs of the field controllers 6a, 6b and 6c are connected to the network cable 12, respectively, and the central controller 5 is connected to one end of the network cable 12.

The operation of the embodiment shown in FIG. 1 will now be described. Acoustic sensor 7, acceleration sensor 8 and switch circuit 9
Each output of is converted into a digital signal by the field controller 6a.

The digital signal is subjected to calculation processing such as integration calculation and FFT calculation (Fast Fourier Transform), and then the result is transmitted to the central control unit 5. Further, when an abnormality or the like occurs in comparison with a preset threshold value, an alarm signal is transmitted to the central controller 5.

Similarly, the on-site control devices 6b and 6c also perform the above-described processing on the outputs of various sensors, and the result is output to the central control device 5.
Send to

The central controller 5 is a field controller 6a-6c.
Display the data sent from as a trend and save the data.

When an alarm signal is received from the on-site control devices 6a to 6c, the operator is notified of that fact and the raw data of the sensor relating to the alarm signal and the on-site control devices 6a to 6c are transmitted. Precise diagnosis is performed based on the processed data.

For example, the acoustic sensor 7 detects abnormal sound of equipment,
The acceleration sensor 8 monitors abnormal vibration of the equipment, and the camera 10 monitors visual abnormality of the equipment. The on-site control devices 6a and 6b judge the abnormality of each sensor based on a threshold value or the like and send it to the central control device 5.

Then, the central control unit 5 comprehensively analyzes the individual alarm signals sent from the on-site control unit to judge the abnormality of the equipment.

As a result, by providing various sensors and a site control device to which these sensors are connected on site and connecting the central control device with a network cable, there is only one wiring between them and the wiring cost is reduced. It

Further, since the distance between the sensor and the on-site control device becomes short, it becomes possible to transmit a high speed signal.

Further, as the network cable 12, an ordinary coaxial cable, an optical fiber or the like can be used, and since wireless transmission is also possible, it is possible to sufficiently cope with a severe noise environment on site.

On the other hand, since the calculation processing, the abnormality determination, etc. are performed on the site controller side, the load on the central controller is reduced, so that the limitation on the number of sensors is greatly relaxed.

The data is taken in by the on-site control device for the purpose of facility diagnosis and does not require immediacy, so it is sequentially performed.

Further, the sampling timing and the like are automatically set for the data acquisition timing in the on-site control device based on preset measurement conditions and the like.

The raw data and processing data of each sensor are sent from the on-site control devices 6a to 6c to the network cable 1.
It is also possible to use 2 for multiplex transmission. For example, it becomes possible to multiplex vibration, sound, image data, and processed data.

For example, when the data value exceeds the threshold value, the data acquisition interval is shortened. This makes it possible to observe trends in detail.

When there are a plurality of cameras 10, it is possible to provide a video switching device in the on-site control device, switch a plurality of image signal inputs on the site side, and then transmit them to the central control device.

Further, by making the on-site control device waterproof, it becomes possible to install the control device outdoors.

[0037]

As is apparent from the above description,
The present invention has the following effects. By providing a variety of sensors and a site control device to which these sensors are connected on site and connecting the central control device with a network cable, it is possible to realize a facility diagnostic device that can connect many sensors at low cost.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of an equipment diagnostic apparatus according to the present invention.

FIG. 2 is a configuration block diagram showing an example of a conventional equipment diagnostic device.

[Explanation of symbols]

1 control device 2 input device 3a, 3b, 3c, 4a, 4b, 4c, 4d, 11a,
11b, 11c, 11d, 11e Sensor 5 Central control device 6a, 6b, 6c Site control device 7 Acoustic sensor 8 Acceleration sensor 9 Switch circuit 10 Camera 12 Network cable 50, 51 Site

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Katsurai 2-932 Nakamachi, Musashino City, Tokyo Yokogawa Electric Co., Ltd. (72) Inventor Katsuya Ikezawa 2-932 Nakamachi, Musashino City Tokyo Within Kawa Denki Co., Ltd.

Claims (6)

[Claims] 1. A facility diagnostic device for diagnosing an abnormality of a facility based on outputs of various sensors installed in the facility, wherein a sensor installed in the facility and a device arranged in the vicinity of the facility for processing the output of the sensor. Facility equipped with an on-site control device for outputting, a central control device for diagnosing the equipment based on the output of the present control device, and a network cable connecting the central control device and the on-site control device Diagnostic device. 2. An equipment diagnostic apparatus according to claim 1, wherein an acoustic sensor, an acceleration sensor and a camera are used as the sensor. 3. The facility diagnostic apparatus according to claim 1, further comprising a site control device for determining an abnormality based on the output of the sensor and transmitting an alarm signal to the central control device. 4. The equipment diagnostic apparatus according to claim 1, further comprising a site control device that sets a sampling cycle based on the output of the sensor. 5. The facility according to claim 1, further comprising a site control device for switching a plurality of image signal inputs on the site side by a video switcher and transmitting the image signal input to the central control device. Diagnostic device. 6. The equipment diagnostic apparatus according to claim 1, wherein outputs of a plurality of the sensors are multiplexed and transmitted to the network cable.