JPH04148871A - Potentiometer signal input device - Google Patents

Abstract

PURPOSE:To enable zero-point and span-value adjustment to be made easily by setting signal obtained from a potentiometer to a measurement data and by performing calculation using the zero-point data and span-value data which are obtained by a signal-reading means. CONSTITUTION:A slider of a potentiometer 1 is set to a position of 0% before adjusting span and zero point and a zero adjusting command is sent from a communication means 2. By receiving this command, a first signal-reading means 3 reads a resistance signal which is obtained between the slider and one edge on the potentiometer 1. Then, the slider of the potentiometer is set to 100% position and a span value adjusting command is transmitted from the communication means 2. By receiving this command, a second signal-reading means 4 reads resistance signal at that time. A calculation means 4 performs a specified calculation using these two resistance signals for obtaining output signal and then performs zero-point and span-value adjustment easily.

Description

[Detailed Description of the Invention] <Industry> Second Field of Application The present invention relates to a potentiometer signal input device for inputting a voltage or resistance value signal obtained from a potentiometer, and more specifically, for inputting a signal from a potentiometer installed in the field. A potentiometer signal input that is applied to a signal conditioner that inputs an input, converts it into a standardized signal of 1 to 5 and outputs it, and allows easy adjustment of the zero point and span value. Regarding equipment.

<Prior Art> FIG. 4 is a conceptual diagram of the configuration of a conventional potentiometer signal input device. Potentiometer 1 is usually installed in the field, and has terminals A and C connected to both ends of resistor R.
It has a terminal I3 connected to a slider, and the slider is configured to be coupled to, for example, a valve so that its position moves in accordance with the opening degree.

The conversion circuit 2 inputs a resistance value signal or a voltage signal corresponding to, for example, a valve opening obtained from the potentiometer 1, converts it into a standardized signal of 1 to 5, and outputs the signal.

In a device configured in this way, the resistance value of the potency iJ meter 1 fluctuates and the wiring resistance of the lead wire connected to the potency iJ meter 1 fluctuates, so the zero point and span should be adjusted before actual use. Values will need to be adjusted.

Conventionally, this type of adjustment is performed when the potentiometer 1 is installed in the field, a resistance measuring device is connected to the input terminal on the conversion circuit 2 side, and the resistance between A and C and the slider are set to 0%. resistance between B and C.

Measure the resistance between B and C when the slider is not set at 100% position, and based on these measurement results,
I was trying to set 7 points for span and ze 1 in conversion circuit 2.

<Problems to be Solved by the Invention> For this reason, in the conventional device, it is necessary to prepare a resistance measuring device, and adjustment of the two points and span values is troublesome.Secondly, measurement errors and setting There was a problem in that there was a possibility that errors could be made.

The present invention has been made in view of these points, and its purpose is to realize a human-powered bodyometer signal device that can easily adjust the center V7 point and the span G6.

Means for Solving the Problems> FIG. 1 is a functional block diagram showing the basic configuration of the present invention. In the figure, 1 is a potentiometer and a resistor R
It has terminals A and C connected to both ends of the slider, and terminal B connected to the slider.

2 is a communication means that gives a span value and zero point adjustment command signal from the outside, 3 is a zero adjustment command received from the communication means 2), and the slider is positioned at 0% from the potentiometer 1. The electric current or resistance obtained between the slider and the - end of the potentiometer (Hz)
A first signal reading means 4 receives a span value adjustment command given from the communication means 2, and when the slider from the potentiometer 1 is positioned at 100%, it connects the slider to one end of the potentiometer 1 meter. A second signal reading means 5 inputs the voltage or resistance signal (Rx) obtained from the potentiometer 1, and reads the voltage or resistance signal (1'<, s) obtained between the first and second signals. Second
Using the signal read by the signal reading means 3.4, the output signal (1'o) is expressed as 10- ((](,x-Rz)/Rs) xlOO
(%).

Note that 6 is a memory for storing various arithmetic expressions, data read by the signal reading means, and the like.

Function> Before adjusting the span and zero point, adjust the potentiometer 1.
Set the slider to the 0% position and move the communication element I from 2 to 1
′? Send adjustment command.

Upon receiving this command, the first signal reading means reads a voltage or resistance value signal (1'(z)) obtained between the slider and one end of the potentiometer.

Subsequently, the slider of the potentiometer 1 is set to the 100% position, and a span value adjustment command is sent from the communication means 2.

The second signal reading means receives this command and reads the voltage or resistance value signal (TLs) obtained between the slider and one end of the potentiometer.

In the measurement mode, the calculation means is configured to perform the first . Using the data read by the second signal reading means, a predetermined calculation is performed to obtain an output signal -'3' (-1, 'o).

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

FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, 7 is a multiplexer, which supplies the reference voltage JjE V r to the potentiometer 1, the voltage signal V a obtained at the terminal A, and the terminal ? -Voltage signal obtained at B■
b, the voltage signal Vc obtained at terminal C is selected and taken out. 8 is a preamplifier that is selected by multiplexer 7 and amplifies the output signal, 9 is an Ai■) converter, ↑
0 is a microprocessor which manually inputs the digital signals 1 from the converter 9, the input signals from the communication means 2, and the like. Here, the communication means 2 is connected to the device as necessary, and for example, a hand belt terminal or the like is used.

The microphone 11 output sensor 10 is configured to operate as the first and second No. 13 reading means 3.4 and calculation means 5 in FIG. Output as a width signal. 1 is a polygon, and 12 is a pulse width/analog signal conversion means for converting a pulse width signal into an analog signal.

The operation of the apparatus constructed in this way will be explained next.

FIG. 3 is a flowchart 1 to 1 showing the concept of the overall operation including adjustment of the span and the 1'7 points.

Microphone 17 processor 10 has multiplexer 7° preamplifier 8. A, /T) via the converter 9, the reference voltage V
r, voltage signal obtained at each terminal A, B, C ■r, Va
, Vb, and Vc. Then, by using these and performing predetermined calculations as will be explained later, the resistance R of the bodyometer 1 and the wiring resistance can be calculated! It is now possible to obtain measurement data that is not affected by -.

After installing the potentiometer 1 in the field, the span value and zero point must first be adjusted. In this adjustment, first, the slider of the potentiometer 1 is set to the 0% position, and a zero adjustment command is sent from the communication means 2. Upon receiving this 70 adjustment command, the microprocessor 10 adjusts the zero point a.
T! It becomes J adjustment mode, and switch S of multiplexer 7
2. S3 is turned on sequentially, voltage signals of terminals B and C are read, and Vb-Vc is calculated. As a result, the zero point setting value (Ry, ) is obtained and stored in the memory 6. In FIG. 1, the first signal reading means 3 performs such an operation.

Subsequently, the slider of the potentiometer 1 is set to the 100% position, and a span adjustment command is sent from the communication means 2. When the microprocessor 10 receives this command signal, it enters the span value adjustment mode, and similarly to the zero point adjustment mode described above, switches S2. Turn on S3 one after another, read the voltage signals of terminals B and C, and read the voltage signals of terminals B and C.
Calculate Vc-Rz. This makes the slider 10
A span value (Rs) is obtained with the span set at the 0% position, and this is stored in the memory 6. In Figure 1, the second
The signal reading means 4 performs such an operation.

The following two operations end the zero point and span value adjustment mode.

In the measurement mode, the slider of the potentiometer 1 is displaced depending on, for example, the opening position of the pulp, and the microprocessor 10 reads the voltage signal obtained from the slider and the signals from each terminal at regular intervals, and performs the measurement. Find the data Rx.

The calculation means 5 in the microprocessor calculates the measurement data Rx
The zero point data Rz and the span value data Rs stored in the memory 6 are then used to calculate the output signal '2'0 according to the following equation.

'i”o= ((R,x-Rz)/Rs)X
]-00(%) The calculation result T O is converted into a pulse width signal, for example, and sent to the pulse width converter 1 via the POH coupler 11.
2 is output. Here, for example, a standardized voltage signal of 1 to 5 is obtained, and this is output as a voltage signal.

According to such an operation, it becomes possible to easily adjust the zero point and span.

In the embodiment of FIG. 2, the potentiometer 1 is configured to be supplied with a reference voltage Jj:'Vr- via a reference resistor 1'ls, and to read a reference voltage V+- via a multiplexer 7. However, next, these effects will be explained using measurement data]'(x) as an example.

In the following explanation, the resistance value of bodyometer] is 1, the resistance value up to the slider position of potentiometer 1 is Rx, and the value of the wiring resistance connected to the potentiometer is 1-.
1 Let the value of the reference resistance be Rs, and the point where the reference voltage bFv +- is given be 'AA''? Voltage 1': EF, dry i 1'+3 (: Voltage between v
I, the voltage between terminals A and 1) RE r”] are respectively (
]), (2>, (3)).

R, EF・(R+2r>・j...(1) Vl
= (Rx+r>-i == (2) R1
−, g) ]=Rs −j
-(3) From equations (1) and (2), (4
) is obtained, and if the resistance value R1 of the potentiometer 1 and the value Rs of the reference resistance are respectively known and deviate from each other, the wiring resistance r can be determined.

R, -t-2r= (REF/REF1) ・Rs・
...(4) Also, from equations (2) and (3), equation (5> can be obtained).

Rx=((VI/Rt) 1'? 1) ・Rs
) --r... (5) Therefore, by performing these calculations, the measurement data R
It is possible to obtain x without being affected by the wiring resistance r.

In the above embodiment, the communication means 2 is a power plate configured to output zero adjustment and span value adjustment mode command signals in response to instructions from an operator or the like. It may be configured to display data such as I7 point and span value.

<Effects of the Invention> As explained in detail above, according to the present invention, it is not necessary to determine the resistance value of a potentiometer installed in the field using a resistance measuring device, etc., as in conventional devices, and the zero point can be easily determined. It is possible to provide a potentiometer signal input device that can adjust the span value and span value.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the basic configuration of the present invention.
FIG. 2 is a configuration block diagram that does not show one embodiment of the present invention, and FIG.
The figure is a flowchart showing the concept of the overall operation including adjustment of span and zero points, and FIG. 4 is a conceptual diagram of the structure of a conventional potentiometer signal input device. DESCRIPTION OF SYMBOLS 1... Potentiometer, 2... Communication means, 3... First signal reading means,
4... Second signal reading means, 5... Arithmetic means, 6... Memory

Claims (1)

[Scope of Claims] A potentiometer signal input device that inputs a voltage or resistance value signal obtained from a potentiometer, comprising a communication means for outputting a zero point and span value adjustment command signal, and a zero adjustment command given from the communication means. a first signal reading means for reading a signal obtained from the potentiometer between the slider and one end of the potentiometer with the slider positioned at 0% as zero point data (Rz); Upon receiving a span value adjustment command given from the communication means, the signal obtained from the potentiometer between the slider and one end of the potentiometer with the slider positioned at 100% is read as span value data (Rs). The second signal reading means reads the zero point data (Rz) and the span value data (Rs) read by the first and second signal reading means, using the signal obtained from the potentiometer as measurement data (Rx). and output signal (To) as To={(Rx
-Rz)/Rs}×100(%).