JPH10209839A - Detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a counter measure to both a case that a power supply terminal is shared with a output terminal and otherwise by providing a power supply terminal, output terminal, and ground terminal in an output circuit at the output side of a detector with which a switching means is connected, and comparing a reference voltage with a power supply voltage for controlling currents to a current amplifier means. SOLUTION: In the case of three wire system detection, a switching terminal 6d is connected with ground, a three wire side output terminal 6b of a two wire and three wire switching means 6 is closed, a two wire side output terminal 6c is opened, and currents from a comparator 13 of a detector 1 are outputted through the three wire side output terminal 6b, amplified by a current amplifying means 7, and outputted to a machine equipment connected with an output terminal 4. Also, in the case of two wire system detection, the switching terminal 6d is opened, the three wire side output terminal 6b is opened, the two wire side output terminal 6c is closed, and the output of the detector 1 is supplied from the two wire side output terminal 6c to a current setting means 10. Then, the current setting means 10 compares a reference voltage from a reference voltage generating means 9 with a voltage from a power supply terminal 3, and controls currents to be supplied to the current amplifier means 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection device used for, for example, automated machine tools.

[0002]

2. Description of the Related Art In automated machine tools and the like, a large number of detection devices are used to monitor the operation of various tools provided therein.

Conventionally, this type of detection device includes a three-wire type having a power terminal, an output terminal, and a ground terminal, and a two-wire type having the power terminal shared with an output terminal and further having a ground terminal. Mixed in the market.

That is, in the three-wire system, a power supply terminal is connected to a power supply, an output terminal is connected to a machine tool, and an earth terminal is connected to a ground, so that a detection output is output to the machine tool. In the case of the wire type, power is supplied to the output terminal from the machine tool, and a detection output is output to the machine tool via the output terminal.

[0005]

In the above two-wire detection device, the machine tool and the detection device are connected in series to the power supply, and the power supply voltage is divided and consumed by the machine tool and the detection device. become. Depending on the type of machine tool, if the voltage consumption is large, it may not be possible to obtain the voltage required for normal operation of the detection device itself. Although it may not be possible, the following description will continue with the case where the required voltage of the detection device is not ensured as a representative). As a result, the use of the two-wire detection device is limited.

Therefore, although there is a merit of wire saving, a three-wire detection device must be prepared besides the two-wire system, and the cost increase accompanying the diversification of products has become a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a detecting device which can be used for both a two-wire system and a three-wire system.

[0008]

In order to achieve the above object, the present invention provides a detector, an output circuit connected to the output side of the detector, a power supply terminal provided in the output circuit,
An output terminal, and an output circuit comprising a ground terminal,
2 whose input terminal is connected to the output side of the detector
Line, three-wire switching means, current amplification means, output driver means provided in order from the three-wire output terminal side between the three-wire output terminal of the two-wire, three-wire switching means and the output terminal, Reference voltage generating means connected to the power supply terminal, and current setting means for comparing a reference voltage generated by the reference voltage generating means with a voltage from the power supply terminal to control a current supplied to the current amplifying means. The two-wire output terminals of the two-wire and three-wire switching means are connected to current setting means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a detector, an output circuit connected to the output side of the detector, a power supply terminal, an output terminal, and a power supply terminal provided in the output circuit. A grounding terminal, wherein the output circuit includes a two-wire / three-wire switching means having an input terminal connected to the output side of the detector; a three-wire-side output terminal of the two-wire / three-wire switching means; A current amplifying unit, an output driver unit, a reference voltage generating unit connected to the power supply terminal, and a reference voltage generated by the reference voltage generating unit. Current setting means for comparing a voltage supplied from a power supply terminal to control a current supplied to the current amplifying means, wherein a two-wire output terminal of the two-wire or three-wire switching means has a detection circuit connected to the current setting means. Device, and with the above configuration, Power to the power supply terminal, various devices such as, for example, machine tools to the output terminal, and which can control the various devices by the output of the detector by connecting ground to each of the ground terminal. In the case of a two-wire system, a power supply terminal and an output terminal are connected, and various devices are connected to the output terminal. Is supplied. Then, the voltage from the power supply terminal, which rises and falls according to the magnitude of the voltage consumed by the various devices connected to the output terminal, and the reference voltage from the reference voltage generation unit are compared by the current setting unit, and the voltage from the power supply terminal is compared. When the voltage is lower than the reference voltage, the current supplied from the current setting means to the current amplifying means is reduced, thereby reducing the current flowing through various devices, thereby suppressing the voltage consumed as the devices and detecting the detection device. Will operate normally.

Therefore, even when used as a two-wire system, various devices can be controlled by the output of the detector.

According to a second aspect of the present invention, the detector has a sensor and processing means for processing the output from the sensor.
Line, three-line switching means, current amplifying means, output driver means,
The reference voltage generation means and the current setting means are configured in an IC,
Power supply terminal, output terminal, ground terminal,
And a switching terminal for a two-wire and three-wire switching means.
In the detection device described above, if the above-described configuration is used, the switching terminal of the two-wire or three-wire switching means provided on the outer surface of the IC is used to detect
Switching between the two-wire and three-wire switching means in C can be easily performed.

Further, the invention according to claim 3 of the present invention provides:
3. The power supply terminal and the output terminal are connected and the switching terminal of the two-wire / three-wire switching means is opened at the time of two-wire switching.
In the above-described configuration, the switching terminal is opened at the time of two-wire switching, so that the current flowing therethrough is eliminated, that is, the current flowing through the detecting device is reduced, so that the power supply On the other hand, it is possible to reduce the current flowing through various devices connected in series with the detection device, thereby reducing the voltage consumption thereof, thereby making it easy to secure the voltage as the detection device.

An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a detection device according to one embodiment of the present invention includes a detector 1, an output circuit 2 connected to an output side of the detector 1, a power terminal 3 provided in the output circuit 2, A terminal 4 and a ground terminal 5 are provided.
The output circuit 2 has an input terminal 6a connected to the detector 1
2-wire and 3-wire switching means 6 connected to the output side of
A current amplifying means 7, an output driver means 8, and a power supply terminal 3, which are provided between the three-wire output terminal 6b of the three-wire switching means 6 and the output terminal 4 in this order from the three-wire output terminal 6b side.
And a current setting means 10 for comparing the reference voltage generated by the reference voltage generating means 9 with the voltage from the power supply terminal 3 to control the current supplied to the current amplifying means 7. The two-wire output terminal 6 c of the two-wire / three-wire switching means 6 is connected to the current setting means 10.

The detector 1 includes a sensor 11 using a magnetoresistive element and an output from the sensor 11
And a comparator 13 (used as an example of processing means) for comparing with a reference value obtained from the resistance division. The comparator 13 of the detector 1 and the 2-wire / 3-wire switching means 6, the current amplifying means 7, the output driver means 8, the reference voltage generating means 9, and the current setting means 10 of the output circuit 2 are configured in an IC. doing. On the outer surface of the IC, a power terminal 3, an output terminal 4, a ground terminal 5, and a switching terminal 6d of a two-wire / three-wire switching means 6 are provided. The reference voltage generated by the reference voltage generator 9 is also supplied to the sensor 11 and the resistor 12.

In this embodiment, a machine tool is connected to the output terminal 4 and the sensor 11 detects that the cylinder of the machine tool reaches a predetermined position by the detecting device shown in FIG. Specifically, the cylinder is provided with a magnet, and when the cylinder reaches a predetermined position, the magnetic force of the magnet provided in the cylinder reduces the resistance value of the magnetoresistive element provided in the sensor 11, and as a result, The output from 11 becomes “high”, and the comparator 13 outputs a current indicating a “high state”.

When a three-wire detector is required as a machine tool connected to this detector, the power supply terminal 3 is connected to the power supply so that the machine tool and the detector of FIG. Connect to A controller in the machine tool is connected to the output terminal 4, and a ground is connected to the ground terminal 5, respectively.
Further, when the switching terminal 6d is connected to the ground and the three-wire output terminal 6b is closed and the two-wire output terminal 6c is opened, the output of the detector 1 is output from the output terminal 4 to the controller of the machine tool. Thereby, operation control of the machine tool can be performed.

That is, at this time, the current from the comparator 13 is amplified by the current amplifying means 7 via the three-wire output terminal 6b of the two-wire / three-wire switching means 6, and is output via the output driver means 8 and the output terminal 4. The output is sent to a controller in the machine tool, that is, the fact that the cylinder has reached a predetermined position is transmitted, and in response to this, the machine tool performs the next operation.

On the other hand, when a two-wire detection device is required, the power supply terminal 3 and the output terminal 4 are short-circuited, and the detection device of FIG. 1 and the machine tool are connected in series to the power supply. Then, a machine tool is connected to the output terminal 4.
Further, the switching terminal 6d of the two-wire / three-wire switching means 6 is opened, and
The output of the detector 1 is supplied from the two-wire output terminal 6c to the current setting means 10 by opening the two-wire output terminal 6b and closing the two-wire output terminal 6c.

The current setting means 10 is driven when a "high state" current is supplied from the detector 1 through the two-wire output terminal 6c. When the current is supplied to the current setting means 10 through the line-side output terminal 6c, the current setting means 10 is supplied from the power supply terminal 3 which rises and falls according to the magnitude of the voltage consumption of the machine tool connected to the output terminal 4. The voltage is compared with the reference voltage generated by the reference voltage generator 9. And the voltage from the power supply terminal 3 is
If it becomes lower than the reference voltage by the reference voltage generation means 9,
The current supplied from the current setting means 10 to the current amplifying means 7 is reduced until the voltage from the power supply terminal 3 becomes the same potential as the reference voltage generated by the reference voltage generating means 9, whereby the machining connected in series to the power supply The current flowing through the equipment is also reduced, so that the voltage consumed as the machine tool is suppressed, and the voltage at which the detection device operates normally is secured.

Therefore, even when used as a two-wire system, the machine tool can be controlled by the output of the detector 1.

[0021]

As described above, the present invention comprises a detector, an output circuit connected to the output side of the detector, a power supply terminal, an output terminal, and a ground terminal provided in the output circuit. The output circuit includes a two-wire / three-wire switching means having an input terminal connected to the output side of the detector,
Between the three-wire output terminal of the line switching means and the output terminal,
A current amplifying unit, an output driver unit, a reference voltage generating unit connected to the power supply terminal, and a reference voltage generated by the reference voltage generating unit and a voltage from the power supply terminal. And current setting means for controlling the current supplied to the current amplification means.
The two-wire output terminal of the line switching means is connected to the current setting means.

With the above arrangement, in the case of the three-wire system, the power supply terminal is connected to a power supply, the output terminal is connected to various devices such as a machine tool, and the ground terminal is connected to the ground. It is possible to control various devices. In the case of a two-wire system, a power supply terminal and an output terminal are connected, and various devices are connected to the output terminal. Is supplied. Then, the voltage from the power supply terminal, which rises and falls according to the magnitude of the voltage consumed by the various devices connected to the output terminal, and the reference voltage from the reference voltage generation unit are compared by the current setting unit, and the voltage from the power supply terminal is compared. If the voltage is lower than the reference voltage, the current supplied from the current setting means to the current amplifying means is reduced, thereby reducing the current flowing to various devices.
The voltage consumed as this device is suppressed, and a voltage at which this detection device operates normally is secured.

Therefore, even when used as a two-wire system, various devices can be controlled by the output of the detector.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detector 2 Output circuit 3 Power supply terminal 4 Output terminal 5 Ground terminal 6 2-wire, 3-wire switching means 6a Input terminal 6b 3-wire output terminal 6c 2-wire output terminal 6d Switching terminal 7 Current amplification means 8 Output driver means 9 Reference voltage generating means 10 Current setting means

Claims (3)

[Claims] An output circuit connected to an output side of the detector; a power supply terminal, an output terminal, and a ground terminal provided in the output circuit; and the output circuit has an input terminal. Has two wires connected to the output side of the detector,
A three-wire switching means, a current amplifying means, an output driver means, and a power supply means provided between the three-wire output terminal of the two-wire and three-wire switching means and the output terminal in this order from the three-wire output terminal side; A reference voltage generating means connected to a terminal, and a current setting means for controlling a current supplied to the current amplifying means by comparing a reference voltage by the reference voltage generating means with a voltage from the power supply terminal, A detecting device in which a two-wire output terminal of the two-wire or three-wire switching means is connected to the current setting means. 2. The detector has a sensor and a processing means for processing an output from the sensor. The processing means of the detector, a two-wire / three-wire switching means of an output circuit, a current amplifying means, and an output driver Means, a reference voltage generating means and a current setting means are constituted in a semiconductor integrated circuit (hereinafter referred to as IC).
2. The detecting device according to claim 1, wherein a power terminal, an output terminal, a ground terminal, and a switching terminal of a two-wire or three-wire switching means are provided on an outer surface of C. 3. The detection device according to claim 2, wherein at the time of two-wire switching, the power supply terminal and the output terminal are connected and the switching terminals of the two-wire and three-wire switching means are opened.