JP2583198Y2 - Input device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device such as a counter and a CPU, and more particularly to an input device capable of supporting both a voltage output type detector and a non-voltage output type detector.

[0002]

2. Description of the Related Art Detectors have two types of output, a voltage output type and a non-voltage output type. For example, in a conventional counter, the output signal of the detector is a voltage output or a non-voltage output type. Only one of the voltage output type detectors could be connected. For this reason, the counter cannot input the outputs of various detectors regardless of the output format, and the range of use of the counter is restricted. The non-voltage output type refers to an output type in which the output is opened (when the output is on) or short-circuited (when the output is off) (“correct use of control equipment, detection switch”, p10, 11 Japan). Electric Control Equipment Manufacturers Association,
"Correct Usage of Control Equipment Timer / Counter" p1
42, 143, edited by the Electric Control Equipment Manufacturers Association of Japan ").

The present invention has been made in view of such a situation, and an input device capable of treating the output of a voltage output type detector and the output of a non-voltage output type detector in the same manner. The purpose is to provide.

[0004]

An input device according to the present invention comprises a switching circuit and a resistance element, and a series circuit in which one terminal is connected to a positive electrode potential or a negative electrode potential and the other terminal is connected to an input terminal. When the output of the voltage output type detector is input to the input terminal, the switching transistor is turned off. When the output of the non-voltage output type detector is input to the input terminal, the switching transistor is turned on to set the positive electrode potential. Or a control circuit for applying a negative potential to the input terminal.

[0005]

In the present invention, when the output of the voltage output type detector is input to the input terminal, the switching transistor is turned off, and the positive potential or the negative potential is not applied to the input terminal. ing. Therefore, the output from the detector is taken as it is into a device that inputs the signal. On the other hand, when the output of the non-voltage output type detector is input to the input terminal, the switching transistor is in the ON state, and the positive potential or the negative potential is applied to the input terminal. Therefore, when the output from the detector is no voltage, a positive potential or a negative potential is applied to the input terminal, and when the output from the detector is the ground potential, the potential becomes the ground potential. When viewed from the input device side, a signal similar to that of the voltage output type detector is input.

[0006]

1 is a circuit diagram of an input device according to an embodiment of the present invention. In the figure, an input terminal 10 is connected to a ground side via a resistor R1 and to an input side of an input circuit 11. An output side of the input circuit 11 is connected to an input port I1 of a microprocessor 12 constituting a counter.
Is connected to the base of a transistor Q1 via a resistor R2, and the collector of the transistor Q1 is connected to a resistor R3.
Is connected to the base of the transistor Q2.
The emitter of the transistor Q2 is connected to the positive electrode side,
The collector is connected to the input terminal 10 via the resistor R4 and the diode D1.

Next, the operation of the input device for a counter having the above configuration will be described. (1) When a voltage output type detector is connected In this case, the microprocessor 12 is set to connect the voltage output type detector by the external key input 13. When the external key input 13 is input, the microprocessor 12 sets a flag in, for example, a built-in memory, and sets the output of the output port O1 to L level based on the flag. This turns off transistor Q1,
Then, the transistor Q2 is also turned off. Therefore, when a voltage output type detector is connected to the input terminal 10, a voltage change occurs in the input terminal 10 in accordance with the ON / OFF signal of the output of the detector, and the microprocessor 12
, And the output of the detector is taken into the microprocessor 12. At this time, it is assumed that the microprocessor 12 is programmed to determine that a signal has been input to the input terminal 10 when the level of the signal input to the input port I1 changes from L to H.

(2) When a no-voltage output type detector is connected In this case, the microprocessor 12 is set to connect a no-voltage output type detector by an external key input 13. The microprocessor 12 resets the flag of the built-in memory when the external key input 13 is input, and sets the output of the output port O1 to H level based on the flag. This turns on transistor Q1 and also turns on transistor Q2.

Therefore, when a non-voltage output type detector is connected to the input terminal 10, a voltage change occurs at the input terminal 10 according to the ON / OFF signal of the output of the detector. For example, when the input terminal 10 is at the ground potential, the potential is input to the input port I1 via the input circuit 11. When no voltage is applied to the input terminal 10 (no voltage output type detector is in the on state), the transistor Q2 is on, and the positive electrode potential is applied via the resistor R4 and the diode D1 to the input terminal. And input to the input port I1 via the input circuit 11. At this time, since the level of the signal input to the input port I1 changes from L to H, the microprocessor 12 determines that the signal has been input to the input terminal 10.

In the above embodiment, the input terminal 1
Although the example in which the positive electrode potential and the ground potential are input to 0 has been described, the present invention can also be applied to the case where the negative electrode potential and the ground potential are input. A negative electrode potential of -24 V is connected to the emitter of the transistor Q2.

Further, the control circuit of the present invention only needs to turn off the transistor Q2 when a voltage output type detector is connected and turn on the transistor Q2 when a non-voltage output type detector is connected. Is the microprocessor 1
2 and may be realized by providing another circuit for controlling the transistor Q2. In addition, the present invention can be applied not only to the counter but also to any device using a microprocessor, and can also be applied to an input device of a device including a gate array and a switch.

[0012]

As described above, according to the present invention, when the output of the voltage output type detector is input to the input terminal and the series circuit including the switching transistor and the resistance element, the switching transistor is turned off and the input is performed. When inputting the output of a non-voltage output type detector to the terminal,
With a control circuit that turns on the switching transistor and applies the positive electrode potential or the negative electrode potential to the input terminal,
The same type of signal is generated regardless of whether a voltage output type detector or a non-voltage output type detector is connected to the input terminal. And a non-voltage output type detector can cope with both of them, and the use range thereof can be expanded.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an input device according to an embodiment of the present invention.

[Explanation of symbols]

 10 input terminal 11 input circuit 12 microprocessor

Claims (1)

(57) [Scope of request for utility model registration] 1. A consists switching transistor and the resistor, the one terminal connected to the positive electrode potential or the negative potential, a series circuit and the other terminal connected to the input terminal, the input
When inputting the output of a voltage output type detector to the
A control circuit that turns off the switching transistor and, when an output of a non-voltage output type detector is input to an input terminal, turns on the switching transistor and applies a positive potential or a negative potential to the input terminal. An input device comprising: