JPS5818798A - Sensor checking apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensor check device for checking the operation of sensors mounted on various devices C2.

Ticket issuing machines, card reading devices, etc. use microswitches, reed switches, etc. to detect the position of paper and cards.
Many sensors such as photo sensors are used. If a failure occurs in such a sensor, the functionality of the entire device may be impaired or malfunction may occur. Therefore, it is essential to check the senna not only during the manufacturing stage of the equipment but also during maintenance and inspection. Therefore, devices equipped with sensors often have a built-in device to check the sensor.

A conventional example thereof is shown in FIGS. 1 and 2 (hereinafter explained).

The sensor check device shown in No. 1 is a device with a relatively small number of sensors. 201 to 204 are two devices such as the operation panel of the equipment, and each sensor's output blinks the corresponding display lamp.This device configuration requires the same number of display lamps as Senna, so Senna's If the number of lamps increases, problems arise in terms of cost and space for arranging the display lamps.

The example in FIG. 2 has a configuration in which the outputs of the sensors 101 to 104 are selectively connected to a changeover switch 205 (therefore, one indicator lamp 2001'). In addition to the problem of requiring an expensive 205 with a large number of contacts, it is also difficult to confirm the correspondence between the sensor and the changeover switch position, which reduces the efficiency of checking work and increases the possibility of errors. occurs.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a sensor checking device that is particularly advantageous when checking a large number of sensors.

There is an upper limit to the function check of the built-in sensors (general sea, equipment), to check whether the output state of each sensor is normal or off, that is, whether the sensor state switching is normal (this is done). The present invention focuses on this point.

However, this invention! - A sensor check device according to the present invention includes a storage means for temporarily storing the output state of each of a plurality of sensors, and compares the output state of each sensor with the state temporarily stored in the storage means number, and detects a mismatched sensor. The present invention is characterized by comprising a comparison means that outputs a signal when even one is detected, and a notification means that responds to the output signal of the comparison means.

Hereinafter, two embodiments of the present invention will be explained with reference to FIG.

In FIG. 3, 1 to 4 are sensors. These sensors are elements such as photo sensors, microswitches, reed switches, etc., which have two output states: on and off. Although the number of sensors is set to four to simplify the explanation, this number is arbitrary.

Reference numeral 18 denotes a temporary memory circuit, which is associated with each of the sensors 1 to 4 and is composed of type flip-flops 9 to 12. Outputs 5-B of sensors 1-4 are output from flip-flops 9-
12 corresponding D (data) inputs); combined;
A common clock pulse 31 is supplied to the T() input of each flip-flop. Each time the clock pulse 31 rises (or falls), the flip-flops 9-1
2 latches the senna outputs 5 to 8 given to its D input: 2 and temporarily holds them until the rise (or fall) of the next clock pulse.

Outputs 5 to 8 of the sensors 1 to 4 are also input to a comparator circuit 6. The comparison circuit includes X0R (exclusive OR) gates 13 to 16 corresponding to sensors l-4ζ2, and an Oa (@RIWA) gate 17 that obtains the OR output of the outputs of these xOB gates.
Consists of. The XOR gate 13 outputs the output 5 of the sensor l,
and the output 21 of the flip-flop 9 corresponding to the output state of the sensor 1 one clock ago. In other words, "1" is output only when the senna output 5 and the 7-rip 7C1-tube output 21 do not match. Similarly, the other XOR gates 14 to 16 compare the outputs 6 to 8 of the sensors 2 to 4 and the outputs 22 to 24 of the 7 lip-flops 10 to 12, and output @1m only when they do not match. If any one of the X0fL gates 13 to 16 outputs 1", the OR
The output of gate 17 is @l#.

The output of the OR gate 17 is T of the D type flip-flop nail.
supplied to the input. This flip-flop τ is its′
Since the O# side output is connected to the D input, a so-called toggle operation is performed in which the C2 state is inverted every time the OR gate output changes from O to L.

4 is a display element such as a light emitting diode, which is driven by the output 321 of the flip-flop γ. Note that the thorn indicating element 4 may be replaced with an acoustic element such as a buzzer.

The operation of this embodiment will be explained below.

First, if all the states of sensors 1 to 4 are fixed (
), the current state of outputs 5 to 8 of sensors 1 to 4, and flip-flops 9 to 12
(This is the same as the nirvanitized state (the state a certain amount of time ago), and the corresponding sensor outputs 5 to 8 and flip-flop outputs 21 to 24 are at the same level ""1m.
or @Om).

Therefore, the outputs of XOR gates 13 to 16 are all "
0m, and the output of the OR gate 17 is ``0''.

Therefore, the state of the 7 lip 70 tube 4 remains unchanged, and the display element 4 remains lit or turned off.

Here, for example, to check the function of the sensor 1, the state of the sensor 1 is reversed and the state of the display element is observed.

For example, if sensor 1 is a microswitch,
The actuating part is actuated in an appropriate manner. If the sensor l is normal, the state of its output 5 changes and the clock pulse 31
At a certain timing, the states of the flip-flop output 21 and the sensor output 5 become inconsistent, and the OR gate 17
The output character of is @1". The OR gate output character is "1"l
:The state of 7 lip-flop 4, that is, its output 3
The state of 2 is reversed, and display element 4 blinks.

In other words, if display element +9 blinks, sensor 1 is normal C=
It's amazing when it's working. If the display element +9 remains on or off even after the sensor 1 is operated, it means that the sensor 1 is normal 1; it is not working. This can be easily understood from the above explanation.

The same procedure (: Therefore, the function check can be performed for the other sensors 2 to 4 as well.

As is clear from the above description, the sensor check device of the present invention does not check the state of the sensor itself, but rather detects changes in the state of the sensor and reports the detection results using reporting means such as a display element. be.

Although one embodiment has been described above, the present invention is not limited to this embodiment.

First, the number of senna is arbitrary. For example, in the case of the Mayuki real M example, an arbitrary number of sensors can be checked by simply increasing or decreasing the number of sensors S + number ζ 2, 7 lip-flops of the memory circuit 18, and the XOR gate of the comparator circuit δ. .

Furthermore, the specific configurations of the memory circuit 18, the comparison circuit 5, etc. can be modified in various ways, and furthermore, it is also possible to change the functions of the two microcomputers.

The sensor check device of the present invention has been described above and has the following advantages.

(1) Regardless of the number of sensors (21), only one display element is required to report the check results, and the problem of the conventional configuration shown in FIG. 1 does not occur.

(2) There is no need for a cut-off switch like in the conventional technology shown in Figure 2, and there is no need to operate the changeover switch or check the correspondence between the changeover switch position and the senna, making checking extremely easy. swift (secondary)

(3) When the number of sensors increases, it is generally more cost effective than the conventional configuration.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams showing the configuration of a conventional sensor check device, respectively, and $31:Ql is a block diagram showing -&lJ of the sensor check device according to the present invention. 1-4...sensor, 9-12.27...7 lip prop, 13-16...XOR gate, 17.
...OR gate, 18...memory circuit, 5...comparison 111 path, 4...display element. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A storage means for temporarily storing the output state of each of the plurality of sensors, and comparing the output state of each sensor with the corresponding output state temporarily stored in the storage means, A sensor check device comprising a comparison means that outputs a signal when even one discrepancy is detected, and a notification means that responds to the output signal C of the comparison means.