JPH0520574A - Alarm sound output device - Google Patents

Abstract

PURPOSE:To make variable the size of the alarm sound according to the effect whether an operator is near a console or away from there by removing only the infrared ray at the range of the wavelength stipulated beforehand out of the infrared rays and controlling the change of a resistance value. CONSTITUTION:The device is equipped with an infrared ray sensor 9 to absorb the energy of the infrared ray generated by an object and to change the resistance value when the temperature rises, a wavelength discriminating circuit 11 to remove only the wavelength of the range stipulated beforehand out of the infrared rays, a starting sound volume adjusting circuit 12 to adjust the volume generated originally by the resistance value, and a volume gradual increasing circuit 10 to increase gradually the volume as the time passes. In the device to communicate the process abnormality of a plant and the instrumentation meter trouble to the operator by the alarm sound and a CRT screen, it is judged whether or not the operator is near the man machine interface, and by the result obtained by the judgment, the volume of the alarm sound is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm sound output device for notifying an operator of a process abnormality or an instrumentation device failure in a plant instrumentation man-machine interface.

[0002]

2. Description of the Related Art A conventional man-machine interface for plant instrumentation monitors and controls the state of a plant on a CRT screen. However, when a process abnormality or an instrumentation device failure occurs, a notification is displayed on the CRT screen. In addition, an alarm sound is output from the speaker to notify the operator.

The alarm sound has several kinds of tones depending on the type of abnormality / fault and the degree of importance, but the volume of each is constant.

[0004]

However, in the conventional alarm sound output device for the plant-instrumentation man-machine interface configured as described above, the volume of the alarm sound is always constant, and the operator does not operate the man-machine interface. It outputs a volume that is audible to an operator at a remote location regardless of whether they are near or far, so if you are nearby, you may hear an unnecessarily loud noise, which is uncomfortable. It was

In view of the above problems, the present invention judges whether the operator is working near the man-machine interface, and if it is near the man-machine interface, starts from a low volume to reduce the mental distress of the operator. An object is to provide a soft alarm sound output device.

[0006]

According to the present invention, an infrared sensor which changes its resistance value when it absorbs the energy of infrared rays emitted from an object and rises in temperature, and a wavelength discriminator which extracts only wavelengths within a predetermined range of infrared rays The alarm sound output device includes a circuit, a starting sound amount setting circuit that sets the initially generated sound volume by a resistance value, and a sound volume increasing circuit that gradually increases the sound volume over time.

[0007]

The present invention absorbs the energy of infrared rays emitted from an object and changes the resistance value when the temperature rises. Only infrared rays within a predetermined wavelength range are taken out and the change in resistance value is detected. Act to control.

[0008]

EXAMPLE An example of the present invention will be described below. FIG. 1 shows an infrared sensor 9 whose resistance value changes when it absorbs the energy of infrared rays emitted by an object and rises in temperature, and a wavelength discriminating circuit 1 for extracting only wavelengths within a predetermined range of infrared rays.
1 is a warning sound output device including a starting sound volume setting circuit 12 that sets the initially generated sound volume by the resistance value, and a sound volume increasing circuit 10 that gradually increases the sound volume with the passage of time. , A man-machine interface of plant instrumentation equipped with a speaker for alarm sound output, etc., in a device that informs the operator of a process abnormality or instrumentation failure of the plant by an alarm sound and a CRT screen, near the man-machine interface The volume of the alarm sound is controlled by the means for determining whether the user is in the room and the result obtained by this means. It is an alarm sound output device of a plant instrumentation man-machine interface, characterized in that it is provided with means. A thermal type detection element such as a thermistor bolometer is used for the infrared sensor, and the low resistance value is largely changed when the infrared energy is absorbed and the temperature rises. Measure the intensity of infrared rays by converting them into small and large.

When such an infrared ray-based obstacle detector is provided, when the operator is on, the volume of the alarm sound starts from a low volume and becomes louder until the operator's alarm confirmation key input is accepted. Add the function of becoming. In addition, when the operator is not near, a loud sound is output from the beginning, and a function is provided so that recognition is not delayed.

With such a configuration, the operator does not need to listen to a loud alarm sound unnecessarily, and it is possible to provide an alarm sound that feels soft whether it is near or far. .

The alarm when an abnormality occurs is CR
This is performed by the display on T6 and the alarm sound from the speaker 8. This alarm sound volume control is performed at time point A shown in FIG.
It is determined whether the operator is near by the infrared sensor 9 to determine whether to start from the time point B or the time point B. If it is near, it starts from time point A, and if it is far from it, it starts from time point B.

The operator can be detected by an ultrasonic method.

[0013]

As described above, according to the present invention, the magnitude of the alarm sound can be varied depending on whether the operator is near or away from the console.

[Brief description of drawings]

FIG. 1 is a perspective view of an alarm sound output device showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operation of a volume increasing circuit.

[Explanation of Codes] 9 ... Infrared sensor 10 ... Volume increasing circuit 11 ... Wavelength discriminating circuit 12 ... Starting tone amount setting circuit

Claims (1)

Claim: What is claimed is: 1. An infrared sensor, the resistance value of which changes when a temperature rises due to absorption of infrared energy emitted by an object, and a wavelength for extracting only a wavelength within a predetermined range from the infrared rays. An alarm sound output device comprising: a discrimination circuit; a starting sound amount setting circuit that sets the initially generated sound volume based on the resistance value; and a sound volume increasing circuit that gradually increases the sound volume over time.