JPH10191553A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress erroneous operation due to noise by providing noise detecting means constituted with an input/output circuit capable of easily affected by the noise by using an element identical to an electronic circuit on a substrate or cable as same as the electronic circuit, and informing the means of the noise detection at that point in time and interrupting the power supply of the electronic circuit. SOLUTION: A noise detecting and indicating equipment 3 is provided in a machine tool control system, and a noise detecting section 31 is arranged, which is so constituted that the influence of the noise can be easily given purposely, on a substrate or cable as same as an electronic circuit capable of detecting the influence of noise in an information processing equipment 1 or a machine tool 2 by using the elements identical to those used in the equipment stated above. And if the noise detecting section 31 detects noise, pulses are output to a register 32 and the output in inverted and output to the information processing equipment 1 through input/output control section 33, a display section 14 displays the above, a lamp 34 is turned on and a buzzer 35 is activated. Also, a power supply control section 3 inside a machine tool 2 is controlled and it power supply section 24 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to electronic equipment,
In particular, the present invention relates to a technology that is effective when applied to an information processing device and an electronic device having an electronic control circuit such as a medical device, an automobile part, and a household appliance.

[0002]

2. Description of the Related Art In recent years, personal computers, PHSs, mobile phones, etc.
While products that generate high-frequency noise have become widespread, electronic circuits that have the weakness of being susceptible to high-frequency noise are increasingly being incorporated into electrical and electronic products and control devices. .

[0003] For this reason, techniques for suppressing the generation of noise, making it less susceptible to the influence of noise, and preventing malfunctions even when affected by noise have become very important.

[0004] As such prior art, for example,
As disclosed in Japanese Patent Application Laid-Open No. 63-171112, when an abnormality in the control state is detected, an alarm is sounded and the power is shut off after a predetermined time has elapsed.

Further, as disclosed in Japanese Patent Application Laid-Open No. 1-158796, there has been a device in which a malfunction is prevented by shielding noise from entering a circuit board.

[0006]

SUMMARY OF THE INVENTION As a result of studying the above prior art, the present inventor has found the following problems.

The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-171112 reports the effect of noise or the like and performs stop processing. Thus, there has been a problem that some trouble has already occurred due to malfunction.

The technique disclosed in Japanese Patent Application Laid-Open No. 1-158796 is for suppressing noise from entering the circuit board as much as possible, and measures against malfunctions when noise enters the circuit board. There was a problem that was not done.

[0009] Further, there is a case in which once a malfunction occurs, such as a medical device, a financial device, or a machine tool, the device cannot be recovered, and the device is affected by noise or the like as in the conventional technology. Informing and stopping the processing and suppressing the noise as much as possible cannot be said to be a sufficient noise countermeasure, and it is required to suppress a malfunction in the future.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to detect a possibility of malfunction due to the influence of noise and suppress the malfunction. Is to provide.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0012]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

In an electronic device having an electronic circuit, an input / output circuit which is easily affected by noise is provided on the same substrate or cable as that of the electronic circuit for which the influence of noise is desired to be detected, using elements equivalent to the circuit. And a means for notifying when the noise is detected by the noise detecting means and turning off the power supply to the electronic circuit.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In the present embodiment, a machine tool control system for automatically controlling a machine tool by information processing will be described as an example of an electronic apparatus.

FIG. 1 is a diagram for explaining a configuration of a machine tool control system according to an embodiment of the present invention.

As shown in FIG. 1, the machine tool control system according to the present embodiment includes an information processing apparatus 1 storing a program for automatically controlling a machine tool, a machine tool 2 to be automatically controlled, and noise detection. And a noise detection display device 3 for displaying.

The information processing apparatus 1 includes a central processing unit 11 for executing a program stored in a storage unit 12 described later, a main storage unit for storing programs and data, and a storage unit 12 including an external storage device. And an input / output control unit 13 for controlling the input and output of data and instructions between the display unit 14 and the machine tool 2, which will be described later, and a display unit 14 for displaying the input and output states of the data and instructions.

The machine tool 2 receives a command from the information processing device 1 and returns a response thereto,
Unit 22 and power supply control unit 2 to be described later in accordance with an instruction from
And a power supply control unit 23 for controlling whether an output of a power supply unit 24 to be described later is turned on or off, and a control unit 23 for controlling the output of the power supply unit 24 described later.
To 23 for supplying power to the power supply unit 23.

The noise detection and display device 3 is configured with circuits and wirings so as to be easily affected by noise, detects a noise and outputs the noise as a pulse, and inverts the output when a pulse is input. The state is maintained until the next reset signal is input. The register 32 is a circuit for storing that noise has been detected, and the function of inputting the output of the register 32 to the information processing device and the register 32 The input / output control unit 33, which is a circuit for controlling the function of resetting, a lamp 34 that lights when a signal indicating that noise has been detected is input, and a signal that indicates that noise has been detected is input. Sounding buzzer 35
Consists of

Next, the operation of the machine tool control system according to the present embodiment when noise is detected will be described.

In the machine tool control system of the present embodiment,
When noise is detected by the noise detection unit 31, a pulse is output to the register 32, the output is inverted by the register 32, and output to the information processing device 1 via the input / output device 33. At the same time, the lamp 34 and the buzzer 35 , And power control device 2
3 is output.

Upon receiving the output, the information processing apparatus 1 displays on the display unit 14 a message stating that the power of the machine tool is to be stopped because noise has been detected, interrupts the automatic control of the machine tool 2, and The time when the noise was detected.

The lamp 34 receiving the output lights up,
The buzzer 35 sounds, and the power supply
To turn off the power of the machine tool 2.

It is also possible to determine whether the detected noise is accidental or continuous based on the time and the number of times the noise is detected, and determine whether to interrupt the automatic control. By doing so, it is possible to increase the accuracy of noise detection.

Next, the above-described noise detector 31 will be described in detail.

The noise detector 31 is a circuit that outputs a signal of a fixed level when there is no influence of noise, but generates a pulse when it is affected by noise. Circuit and wiring that are easily affected by

Here, the information processing apparatus 1 or the machine tool 2
However, when the circuit shown in FIG. 2 changes the output signal depending on whether the voltage level of the input signal is higher or lower than a specific level, such as TTL, the noise detection unit 31 detects noise. Specific examples of circuit and wiring configurations that are easily affected are shown below.

FIG. 2 shows an inverter circuit in which when the input voltage E of the receiver a is higher than EH, its output is at a low level, and when the input voltage E is lower than EL, its output is at a high level. The noise detector 31 at this time
The following four specific examples of circuit and wiring configurations that are susceptible to the above noise are shown.

(1) A circuit in which the voltage level of the input signal is set close to the voltage used as a reference for judging the level.
This means that the values of R1 and R2 are set so that EL <E <EH at the input voltage E shown in FIG.

With this configuration, the output of the receiver a cannot be specified as a high level or a low level according to the specification, but actually, the output of the receiver a is inclined to one of the levels due to the characteristic difference of the element. When the noise is added to the input, the input voltage E becomes unstable, the output is temporarily inverted in level, output as a pulse, and the noise can be detected.

(2) A circuit is set up so that the impedance of the input side signal is increased so that the voltage change on the input side due to the induced current is increased. This is shown in FIG.
Is to set the values of R1 and R2 shown in FIG.

With this configuration, noise can be more easily picked up than the circuit described in (1).

(3) The high-frequency impedance can be increased by wiring the input side signal or the output side signal on the wiring board or the interface cable so as to be intentionally long or by using a thin wire. Configure with the set circuit. This means that the signal line of the input-side signal shown in FIG. 2 is intentionally made longer or thinner.

With this configuration, similarly,
It becomes easier to pick up noise than the circuit described in (1).

(4) The power supply or ground for driving the circuit is intentionally lengthened on the wiring board or the interface cable, or is wired with a thin line so that the high-frequency impedance is increased. Configure with the set circuit. This is the receiver a shown in FIG.
The purpose is to intentionally lengthen or thin the power supply of the power supplied to the power supply and the signal line of the ground line.

With this configuration, similarly,
It becomes easier to pick up noise than the circuit described in (1).

Therefore, as described above, an input / output circuit is formed on the same substrate or cable as the electronic circuit for which the influence of noise is to be detected, using elements equivalent to the circuit, and the input side voltage, The wiring pattern and the power supply of the element, the wiring pattern of the ground, and the like are intentionally set so as to be easily affected by the noise, and the output is observed, so that the noise detecting means for detecting the noise and the noise detecting means can be used. Means for notifying when the noise is detected and turning off the power supply to the electronic circuit, thereby detecting with a simple circuit configuration that the electronic circuit may be affected by the noise. Can, receive noise,
Since the power supply to the electronic circuit can be stopped before a malfunction is caused, the malfunction can be suppressed.

Further, in each electronic device applicable to the present invention,
Specifically, the following effects are obtained.

(1) In the electronic control circuit section of the machine tool, when the noise is detected, the power supply of the entire system is cut off, so that the machine tool malfunctions and the material may be destroyed or the human body may be injured. Work around.

(2) When the electronic control circuit section of the automatic teller machine detects noise, it stops the deposit and withdrawal of money and displays on the screen that the system is out of order. At the same time, the reliability of the system is improved by contacting the host computer or a maintenance manager and requesting repair or automatic recovery.

(3) In a medical device which is operated and used by a patient himself, when noise is detected, an alarm is generated by sound or the like, so that a nurse or a doctor in charge is called to take appropriate measures. Becomes possible.

(4) In the information processing apparatus, when noise is detected, the subsequent processing is executed twice for a command such as an operation, and when the results match, it is regarded as normal.
In the writing process to the storage device, after the writing, the value is read again, the values are compared, and if the results match, the process is regarded as normal.This process is performed after noise is not detected within a specific time. Until the time elapses, and then return to normal processing. By the above processing,
It is possible to improve reliability at the time of noise detection without lowering normal performance.

As described above, the invention made by the present inventor is:
Although specifically described based on the embodiment, the present invention
It is needless to say that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the scope of the invention.

[0045]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

It is possible to detect the possibility of malfunction due to the influence of noise and to suppress malfunction.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a machine tool control system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a noise detection unit 31 according to the embodiment.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 information processing device 2 machine tool 3 noise detection display device 11 central processing unit 12 storage unit 13 input / output control unit 14 display unit 21 main control unit 22
... Mechanism unit, 23 ... Power supply control unit, 24 ... Power supply unit, 31 ... Noise detection unit, 32 ... Register, 33 ... I / O control unit, 3
4 ... lamp, 35 ... buzzer.

Claims (1)

[Claims] 1. An electronic device having an electronic circuit, comprising: an input / output circuit which is easily affected by noise by using an element equivalent to the circuit on the same substrate or cable as the electronic circuit for which the influence of noise is to be detected. An electronic device comprising: a noise detection unit configured as described above; and a unit that, when noise is detected by the noise detection unit, notifies the noise detection unit and turns off power supplied to the electronic circuit.