JP3488034B2 - Detection device - Google Patents

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 in, for example, automated machine tools.

[0002]

2. Description of the Related Art In automated machine tools and the like, many detectors are used to monitor the operation of various tools provided therein.

Conventionally, this type of detection device is of a three-wire type having a power supply terminal, an output terminal, and a ground terminal, and a two-wire type one having the power supply terminal shared with the output terminal and further having a ground terminal. It was mixed in the market.

That is, in the three-wire type, the detection output is output to the machine tool by connecting the power source to the power source, the output terminal to the machine tool, and the ground terminal to the ground, respectively. In the wire type, the power is supplied from the machine tool to the output terminal, and the detection output is output to the machine tool via the output terminal.

[0005]

In the above-mentioned two-wire type detecting device, the machine tool and the detecting device are connected in series to the power source, and the power supply voltage is divided and consumed by the machine tool and the detecting device. become. Depending on the type of machine tool, if the voltage consumption is high, it may not be possible to obtain the voltage for the detector itself to operate normally (on the contrary, if the voltage consumption of the detector is high, the required voltage for the machine tool may not be obtained. Although it may not be provided, the following description will be continued with the case where the required voltage of the detection device is not secured) as a representative). In conclusion, the use of the two-wire detection device is limited.

Therefore, although there is a merit of reducing the number of wires, it is necessary to prepare a detection device of a three-wire type in addition to the two-wire type, and there has been a problem of cost increase due to the production of various products.

[0007] Therefore, an object of the present invention is to provide a detection device capable of supporting both the two-line type and the three-line type.

[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, and a power supply terminal provided in the output circuit.
The output circuit having an output terminal and a ground terminal,
2 whose input terminal is connected to the output side of the detector
Line, 3 line switching means, a current amplifying means and an output driver means provided in order from the 3 line side output terminal side between the 3 line side output terminal of the 2 line and 3 line switching means and the output terminal, A reference voltage generation unit connected to the power supply terminal; and a current setting unit that compares the reference voltage generated by the reference voltage generation unit with the voltage supplied from the power supply terminal to control the current supplied to the current amplification unit. The 2-wire side output terminals of the 2-wire and 3-wire switching means are connected to the current setting means.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention includes 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 A ground terminal is provided, and the input terminal of the output circuit is a two-wire / three-wire switching means connected to the output side of the detector, and a three-wire side output terminal of the two-wire / three-wire switching means. Between the output terminal and the three-wire side output terminal side, a current amplification means, an output driver means, a reference voltage generation means connected to the power supply terminal, a reference voltage generated by the reference voltage generation means, and the reference voltage generation means. A current setting means for controlling the current supplied to the current amplifying means by comparing the voltage from the power supply terminal, and the 2-wire side output terminal of the 2-wire / 3-wire switching means is connected to the current setting means. It is a device, and with the above configuration, in the case of 3-wire type 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 the two-wire system, the power supply terminal and the output terminal are connected, and various devices are connected to the output terminal, and the output of the detector from the two-wire side output terminal to the current setting means by the two-wire and three-wire switching means. To be supplied. Then, the current setting means compares the voltage from the power supply terminal that rises and falls according to the magnitude of the consumption voltage of various devices connected to the output terminal with the reference voltage by the reference voltage generation means, and the voltage from the power supply terminal is If the voltage becomes lower than the reference voltage, the current supplied from the current setting means to the current amplification means is reduced, thereby reducing the current flowing through various equipments, thereby suppressing the voltage consumed by the equipments. Will ensure a voltage for normal operation.

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. The processing means for the detector and the output circuit are provided.
Wire, 3 wire switching means, current amplification means, output driver means,
The reference voltage generating means and the current setting means are configured in the IC,
On the outer surface of this IC, power supply terminal, output terminal, ground terminal,
And a switching terminal for the two-wire and three-wire switching means.
With the above-mentioned structure, the detection device according to the above paragraph 1 is provided with a switching terminal of a two-wire / three-wire switching means provided on the outer surface of the IC.
Switching between the two-line and three-line switching means in C can be easily performed.

The invention according to claim 3 of the present invention is
3. When switching between two wires, 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.
In the detection device described in (1) above, the switching terminal is opened at the time of 2-wire switching, so that the current flowing therethrough is eliminated, that is, the current flowing through the detection device is reduced, and the power supply is reduced. On the other hand, it is possible to reduce the current flowing through various devices connected in series with the detection device and reduce the voltage consumption there, 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 an embodiment of the present invention includes a detector 1, an output circuit 2 connected to the output side of the detector 1, a power supply terminal 3 provided in the output circuit 2, and an output. A terminal 4 and a ground terminal 5 are provided.
The input terminal 6a of the output circuit 2 is the detector 1
2 wire and 3 wire switching means 6 connected to the output side of the
Between the three-wire side output terminal 6b of the three-wire and three-wire switching means 6 and the output terminal 4, the current amplifying means 7, the output driver means 8, and the power supply terminal 3 which are provided in order from the three-wire side output terminal 6b side.
And a current setting means 10 for controlling the current supplied to the current amplification means 7 by comparing the reference voltage generated by the reference voltage generation means 9 with the voltage from the power supply terminal 3. The output terminal 6c on the 2-wire side of the 2-wire and 3-wire switching means 6 is connected to the current setting means 10.

The detector 1 further comprises a sensor 11 using a magnetoresistive element, and an output from the sensor 11 is a resistor 12
And a comparator (used as an example of a processing unit) 13 for comparing with a reference value obtained from the resistance division. The comparator 13 of the detector 1, 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. is doing. A power supply terminal 3, an output terminal 4, a ground terminal 5, and a switching terminal 6d of the 2-wire / 3-wire switching means 6 are provided on the outer surface of the IC. The reference voltage generated by the reference voltage generating means 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 detection device of 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 decreases the resistance value of the magnetoresistive element provided in the sensor 11, and as a result, the sensor is The output from 11 becomes “high”, and the comparator 13 outputs a current indicating “high state”.

When a 3-wire type detecting device is required as a machine tool connected to this detecting device, the power supply terminal 3 is powered so that the machine tool and the detecting device of FIG. 1 are in parallel with the power source. Connect to. Further, the output terminal 4 is connected to the controller in the machine tool, and the ground terminal 5 is connected to the ground.
Further, when the switching terminal 6d is connected to the ground and the 3-wire side output terminal 6b is closed and the 2-wire side 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. Thus, the 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 3-wire side output terminal 6b of the 2-wire / 3-wire switching means 6 and then via the output driver means 8 and the output terminal 4. It is output to the controller in the machine tool, that is, the fact that the cylinder has reached the predetermined position is transmitted, and in response to this, the machine tool performs the next operation.

On the other hand, when a two-wire type 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 2-wire / 3-wire switching means 6 is opened, and 3
By opening the line side output terminal 6b and closing the line 2 side output terminal 6c, the output of the detector 1 is supplied from the line 2 side output terminal 6c to the current setting means 10.

The current setting means 10 is driven when the "high state" current is supplied from the detector 1 through the 2-wire side output terminal 6c, and the "high state" current is 2 times. When supplied to the current setting means 10 via the line-side output terminal 6c, the current setting means 10 is supplied from the power supply terminal 3 which moves up and down according to the magnitude of the consumption voltage of the machine tool connected to the output terminal 4. The voltage is compared with the reference voltage generated by the reference voltage generating means 9. Then, the voltage from the power supply terminal 3 is
If it becomes lower than the reference voltage generated by the reference voltage generation means 9,
The current supplied from the current setting means 10 to the current amplification means 7 is reduced until the voltage from the power supply terminal 3 becomes the same potential as the reference voltage by the reference voltage generation means 9, whereby the work connected in series to the power supply. The current flowing through the equipment is also reduced, the voltage consumed as a machine tool is suppressed, and the voltage at which this detection device operates normally is secured.

Therefore, even when it is 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 has two-wire and three-wire switching means whose input terminals are connected to the output side of the detector, and the two-wire and three-wire switching means.
Between the output terminal of the wire switching means on the 3-wire side and the output terminal,
The current amplifying means, the output driver means, which are sequentially provided from the output terminal side of the 3-wire side, the reference voltage generating means connected to the power supply terminal, and the reference voltage by the reference voltage generating means and the voltage from the power supply terminal are compared. Current setting means for controlling the current supplied to the current amplifying means,
The 2-wire side output terminal of the line switching means is connected to the current setting means.

With the above construction, in the case of the three-wire system, if the power source terminal is connected to the power source, the output terminal is connected to various equipment such as machine tools, and the ground terminal is connected to the ground, the output of the detector is determined. It becomes possible to control various devices. In the case of the two-wire system, the power supply terminal and the output terminal are connected, and various devices are connected to the output terminal, and the output of the detector from the two-wire side output terminal to the current setting means by the two-wire and three-wire switching means. To be supplied. Then, the current setting means compares the voltage from the power supply terminal that rises and falls according to the magnitude of the consumption voltage of various devices connected to the output terminal with the reference voltage by the reference voltage generation means, and the voltage from the power supply terminal is If it becomes lower than the reference voltage, the current supplied from the current setting means to the current amplifying means is reduced, and thereby the current flowing through various devices is also reduced.
The voltage consumed by this equipment is suppressed, and the voltage at which this detection device operates normally is secured.

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

[Brief description of drawings]

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

[Explanation of symbols]

1 detector 2 output circuits 3 power terminals 4 output terminals 5 ground terminal 6 2 wire, 3 wire switching means 6a input terminal 6b 3 wire side output terminal 6c 2 wire side output terminal 6d Switching terminal 7 Current amplification means 8 Output driver means 9 Reference voltage generating means 10 Current setting means

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 4-76249 (JP, A) Actual Development 7-36297 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H03K 17/74-17/98

Claims (3)

(57) [Claims] 1. A detector, an output circuit connected to an output side of the detector, and a power supply terminal, an output terminal, and a ground terminal provided in the output circuit, the output circuit having an input terminal thereof. Are two wires connected to the output side of the detector,
A 3-wire switching means, a current amplifying means, an output driver means, and a power source provided between the 3-wire side output terminal of the 2-wire and 3-wire switching means and the output terminal in order from the 3-wire side output terminal side. A reference voltage generating means connected to the terminal, and a current setting means for comparing the reference voltage generated by the reference voltage generating means with the voltage from the power supply terminal to control the current supplied to the current amplifying means. A detection device in which the 2-wire side output terminals of the 2-wire and 3-wire switching means are connected to the current setting means. 2. The detector has a sensor and a processing means for processing the output from the sensor, and the processing means for the detector, the two-wire / three-wire switching means of the output circuit, the current amplifying means, and the output driver. The means, the reference voltage generating means, and the current setting means are configured in a semiconductor integrated circuit (hereinafter referred to as IC), and the I
The detection device according to claim 1, wherein a power supply terminal, an output terminal, a ground terminal, and switching terminals of a two-wire / three-wire switching means are provided on the outer surface of C. 3. The detection device according to claim 2, wherein when switching between two wires, 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.