JP2012042307A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder for generating, with a comparatively simple setting input operation, an arbitrary logarithmic grid and scale.SOLUTION: A recorder for measuring a measurement signal which changes as a function of logarithm is constituted so as to be able to select either a first scale in which the interval between main scale marks is logarithmically divided or a second scale in which the interval between main scale marks is equally divided.

Description

  The present invention relates to a recorder, and more particularly to the display and recording of a measurement signal that varies as a function of logarithm.

  One type of recorder that records the level change state of an analog input signal over a long period of time is a paperless recorder that uses a two-dimensional display such as liquid crystal or organic EL instead of recording paper.

  FIG. 7 is a block diagram showing an example of a conventional paperless recorder, and shows an example of a trend waveform display dedicated screen. FIG. 8 is an explanatory diagram of a composite display screen. In FIG. 7, a measurement unit 1, a control unit 2, a memory 3, a display position calculation unit 4, a time deviation calculation unit 5, and a display control unit 6 are connected to each other via a bus.

  In such a configuration, an analog input signal such as a voltage is converted into a digital value by the measurement unit 1, and the converted digital value is stored in the measurement data storage unit 3 a of the memory 3 as measurement data under the control of the control unit 2. The

  The control unit 2 instructs the display position calculation unit 4 to update the waveform every specified waveform update period. The display position calculation unit 4 waits for the instruction and creates a waveform image to be displayed as shown in FIG. 8A in the waveform drawing region 3b based on the measurement data stored in the measurement data storage unit 3a of the memory 3. To do.

  The display waveform shown in FIG. 8A is as shown in FIG. 8C in the synthesis region 3c together with the scale axis grid shown in FIG. 8B and the time axis grid for making it easy to read the time information of the waveform data. Is synthesized.

  Here, the scale axis grid and the time axis grid shown in FIG. 8B are the number of divisions in the scale direction stored as setting data in the synthesis area 3c by the display position calculation unit 4 and the setting data storage unit 3d. Based on the time interval in the time direction, etc., it is created as a predetermined equidistant grid orthogonal to each other.

  The time deviation calculation unit 5 sets the time of the first time axis grid generated and displayed immediately after changing the setting of the time axis grid to the internal reference time of the paperless recorder. Find and store the deviation. The time of each time axis grid generated and displayed at intervals of, for example, 30 dots or 40 dots that follow thereafter is corrected so as to coincide with each hour based on the time deviation data calculated and stored by the time deviation calculator 5. Is done.

  The synthesized image shown in FIG. 8C synthesized in the synthesis area 3c is displayed on the display screen of the display unit 7 composed of a two-dimensional display via the display control unit 6.

  FIG. 9 is a block diagram showing another example of a conventional paperless recorder, which has a screen layout function capable of freely arranging display components such as trend waveforms and digital values at arbitrary positions on the screen. Common parts are given the same reference numerals.

  In FIG. 9, the memory 3 is provided with a layout data storage unit 3e for storing screen layout data for arranging various display components such as trend waveforms and digital values at arbitrary positions on the screen.

  The display position calculation unit 4 is provided with a calculation unit corresponding to each type of display component, but FIG. 8 shows only the trend calculation unit 41 that calculates the display position of the trend waveform. For example, as shown in FIG. 10, the trend calculation unit 41 includes a waveform display calculation unit 41a, a grid display calculation unit 41b, and a composite calculation unit 41c.

The case of generating the composite display screen of FIG. 8 with the configuration of FIGS. 9 and 9 will be described.
When a waveform update command is output from the control unit 2, the waveform display calculation unit 41a is based on the measurement data stored in the measurement data storage unit 3a and the layout data stored in the layout data storage unit 3e (see FIG. A waveform image to be displayed as shown in A) is created in the waveform drawing area 3b.

  Subsequently, the grid display calculation unit 41b is based on the layout data stored in the layout data storage unit 3e and the number of divisions in the scale direction and the time interval in the time direction stored as setting data in the setting data storage unit 3d. Then, the scale axis grid and the time axis grid are created in the synthesis region 3c as predetermined equidistant grids orthogonal to each other as shown in FIG. 8B.

  Then, the synthesis calculation unit 41c transfers and copies the waveform image to be displayed as shown in FIG. 8A created in the waveform drawing area 3b to the synthesis area 3c, and the synthesized image shown in FIG. Synthesize.

  The synthesized image shown in FIG. 8C synthesized in the synthesis area 3 c in this way is displayed on the display screen of the display unit 7 via the display control unit 6.

  Patent Document 1 describes a recording apparatus that allows a user to freely set grid lines when recording a measurement waveform.

JP-A-7-225140

  However, according to these conventional configurations, only a simple logarithmic grid and scale can be created based on the time interval, the number of divisions in the scale direction, and the like. I can only do it.

  In addition, the logarithm display auxiliary line can be drawn only at unequal intervals according to a predetermined rule between equal divisions.

  The present invention solves such problems, and an object of the present invention is to realize a recorder capable of generating an arbitrary logarithmic grid and scale by a relatively simple setting input operation.

In order to achieve the above object, the invention described in claim 1 of the present invention is:
In a recorder that measures a measurement signal that varies as a function of logarithm,
A first scale in which the parent scales are logarithmically divided and a second scale in which the parent scales are evenly divided can be selected.

The invention according to claim 2 is the recorder according to claim 1,
The recorder is either a paperless recorder using a two-dimensional display instead of recording paper or a chart recorder using recording paper.

The invention described in claim 3 is the recorder according to claim 1 or 2,
Set and input the channel number, calculation mode corresponding to the scale, measurement range, input range, scale value for the input range, and alarm parameters necessary to generate one of the scales selected for each measurement channel. A screen and a memory for storing the values of these parameters are provided.

The invention according to claim 4 is the recorder according to any one of claims 1 to 3,
The measurement signal is measured at every measurement period, and the measurement data is converted into a digital value composed of a mantissa value and an exponent value and displayed and stored.

  According to the present invention, an arbitrary log grid and scale can be generated and displayed.

It is a block diagram which shows one Example of this invention. It is an example of the item of the measurement data stored in the measurement data storage part 3a based on the setting of FIG. It is a specific example figure of the setting screen for setting the setting item of the scale and alarm shown in FIG. It is explanatory drawing of the scale corresponding to each calculation mode. It is an index display example figure. It is an example of a display screen based on this invention. It is a block diagram which shows an example of the conventional paperless recorder. It is explanatory drawing of the conventional synthetic | combination display screen. It is a block diagram which shows the other example of the conventional paperless recorder. It is a block diagram which shows the structural example of the trend calculation part 41 of FIG. It is a grid example figure of the conventional logarithm display.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Although the basic configuration of the present invention is common to the block diagram of FIG. 7 or FIG. 9, the setting items stored in the setting data storage unit 3d and the measurement data stored in the measurement data storage unit 3a in FIG. The combination of data items is a feature of the present invention.

  FIG. 1 is a block diagram showing an embodiment of the present invention, showing setting items stored and set for each channel in the setting data storage unit 3d. (A) shows setting items for a scale. B) shows alarm setting items.

For example, the following eight items are set as setting items for the scale of one channel.
1) Calculation mode 3d11
2) Range 3d12
3) Span lower limit 3d13
4) Span upper limit 3d14
5) Scale lower limit Mantissa 3d15
6) Lower limit of scale Index 3d16
7) Scale upper limit Mantissa 3d17
8) Scale upper limit Index 3d18
As the N channel scale setting items, calculation mode 3dN1 to scale upper limit index 3dN8 are set.

For example, the following six items are set as alarm setting items for one channel.
1) Upper limit alarm ON / OFF 3d19
2) Upper limit alarm Mantissa 3d110
3) Upper limit alarm index 3d111
4) Lower limit alarm ON / OFF 3d112
5) Lower limit alarm Mantissa 3d113
6) Lower limit alarm index 3d114
As the N channel alarm setting items, upper limit alarm ON / OFF 3dN9 to lower limit alarm index 3dN14 are set.

FIG. 2 shows an example of items of measurement data stored in the measurement data storage unit 3a in FIG. 7 or 9 based on the setting of FIG. Is stored.
1) Voltage value 3a11
2) Trend recording position 3a12
3) Digital value Mantissa 3a13
4) Digital value Index 3a14
5) Lower limit alarm detection result 3a15
6) Upper limit alarm detection result 3a16
As the N-channel measurement data, voltage value 3aN1 to upper limit alarm detection result 3aN6 are stored.

The operation of the apparatus configured as shown in FIG. 1 will be described.
FIG. 3 is a specific example of a setting screen for setting the setting items of the scale and alarm shown in FIG. These setting items are set for each channel based on the output specifications of the converter.

  First, as a calculation mode, “LOG1” mode for displaying a scale obtained by dividing a logarithm between parent scales as shown in FIG. 4 (A), and an interval between parent scales as shown in FIG. 4 (B). Any of the “LOG2” modes for displaying the scale divided into nine can be selected and set. In this embodiment, the “LOG1” mode is selected.

In the “LOG1” mode shown in FIG. 4A, 5 × 10 ¹ is assigned as the 1V scale value and 2 × 10 ⁵ is assigned as the 5V scale value for the measurement voltage of ¹ to 5V. In the “LOG2” mode shown in FIG. 4B, for the measurement voltage of 1 to 5V, 10 ² is assigned as the 1V scale value and 10 ⁵ is assigned as the 5V scale value.

  Next, the measurement range is selected. In this embodiment, since the output of the converter is 1 to 5V, the 6V range is selected.

  Next, the input range is specified. In this embodiment, 1.000 V is set as the span lower limit, and 5.000 V is set as the span upper limit.

  Next, set the scale value for the span lower limit and the span upper limit. In this embodiment, since “LOG1” is selected and set as the calculation mode, 5E + 1 is set as the scale lower limit, and 2E + 5 is set as the scale upper limit. If “LOG2” is selected and set, 1E + 2 is set as the scale lower limit, and 1E + 5 is set as the scale upper limit.

  Then, alarm items are set as necessary. In this embodiment, the alarm is one point each for the lower limit and the upper limit. When using the alarm, the alarm setting is turned ON, and a temporary value and an exponent value are input and set as the alarm set value. In this embodiment, 7.5E + 1 is set as the lower limit alarm, and 8.5E + 4 is set as the upper limit alarm.

  FIG. 3 shows an example in which a temporary value and an exponent value are input and set as the scale lower limit value / upper limit value and the alarm setting value, respectively, but 5E + 1 is set to 50, 2E + 5 is set to 200000, and the actual value is input and set. You may make it do.

Further, as the form of the index display of FIG. 3, as shown in FIG. 5, “E display” and “10 ^× display” may be selected. For example, when the real value is “4770”, “4.77E + 3” is displayed when “E display” is selected, and “4.77 × 10 ³ ” is displayed when “10 ^x display” is selected.

  After various measurement display conditions are set as shown in the setting screen of FIG. 3, the measurement unit 1 of FIG. 7 or 9 measures an analog measurement signal of a plurality of channels input to each input terminal with an A / D converter. It converts into a digital signal for every period, performs a necessary correction calculation, etc., and stores it in the measurement data storage unit 3a as voltage value measurement data as shown in FIG.

The display position calculation unit 4 in FIG. 7 or FIG. 9 calculates the trend display position by the equation (1) based on the measurement data stored in the measurement data storage unit 3a.
P = {(Measurement voltage value-Span lower limit) / (Span upper limit-Span lower limit)} * Display span + Start point display position (1)

  FIG. 6 is a specific example of the display unit 7 of FIG. 7 or FIG. 9, which is composed of, for example, 640 × 480 dots, (A) shows an operation mode of “LOG1”, and (B) shows “LOG2”. This shows the operation mode. The display span when displaying the measurement result on the X axis of such a display unit is 639 at (X coordinate 639−X coordinate 0). In addition, the start point display position is 0 when the X coordinate is 0.

For example, if the measured voltage value is 2.77905 V, the display position P in the “LOG1” mode in FIG.
P = {(2.779905-1) / (5-1)} * 639 + 0
≒ 284
And the X coordinate is 284th dot (the decimal part is rounded off).

The display position P in the “LOG2” mode in FIG. 6B can also be calculated by the equation (1). For example, if the measured voltage value is 2.48148V,
P = {(2.448148-1) / (5-1)} * 639 + 0
≒ 237
Thus, the X coordinate is 237th dot (rounded off after the decimal point).

  Next, a digital value Y for use in alarm detection or the like is obtained based on the measurement data stored in the measurement data storage unit 3a.

  In the case of the “LOG1” mode shown in FIG.

  However, SCL upper limit = log (scale upper limit) and SCL lower limit = log (scale lower limit).

In order to obtain the digital value Y when the measured voltage value is 2.77905V,
SCL upper limit = log (2E + 5)
= 5.30103
SCL lower limit = log (5E + 1)
= 1.69897
Is substituted into equation (2).

Y = 10 ^3.30103
= 2000.01
= 2.00E + 3
The mantissa value is 2.00 and the exponent value is 3. These digital values are respectively stored in the digital value mantissa and digital value exponent areas of the measurement data item of FIG. 2 assigned to the measurement data storage unit 3a. The real value 2000.01 may be stored in accordance with the storage form of the alarm set value.

In the case of the “LOG2” mode shown in FIG. In this case, as shown in FIG. 4B, the mantissa setting values of the scale lower limit and the scale upper limit are set to the same value.
Scale lower limit 1E + 2
Scale upper limit 1E + 5

Z = {(Measurement voltage value-Span lower limit) / (Span upper limit-Span lower limit)} *
(Scale upper limit index-Scale lower limit index) + Scale lower limit index (3)
Here, assuming that the quotient of Z is A, A represents an exponent value, and assuming that the remainder of Z is B, B represents the ratio of the mantissa value.

Subsequently, a provisional value is obtained by equation (4).
B ′ = B * (10 * scale mantissa−scale mantissa) + scale mantissa (4)
And the digital value Y is
Y = B '* 10 ^A (5)
Can be obtained.

From these, the digital value when the measured voltage value is 2.48148V is
Z = {(2.448148-1) / (5-1)} * (5-2) +2
Quotient (A) = 3
Remainder (B) = 0.11111
B ′ = 0.111111 * (10 * 1-1) +1
= 2
Y = 2 * 10 ³
= 2000
= 2.00E + 3
become.

The alarm detection operation will be described.
Alarm detection is performed by comparing the alarm set value with the digital value of the measurement result.
a) Upper limit alarm An upper limit alarm occurs when the following conditions are met.
(Upper limit alarm index set value <measurement result index value) or ((upper limit alarm index set value = measurement result index value) &
(Upper limit alarm mantissa set value ≤ Measurement result mantissa))

b) Lower limit alarm And when the following conditions are satisfied, it becomes a lower limit alarm.
(Lower limit alarm index set value> Measurement result index value) or ((Lower limit alarm index set value = Measurement result index value) &
(Lower limit mantissa set value ≥ Measurement result mantissa))
These alarm detection results are stored in the measurement data storage unit 3a in FIG. 7 or FIG.

  The alarm set value is stored in the memory as a real number (for example, 85000 (= 8.5E + 4)), and is detected by comparing the real number of the measured digital value (for example, 2000 (= 2.0E + 3)). It may be.

The scale scale position will be described.
a) “LOG1” mode (FIG. 6A)
The scale position on the X-axis side can be obtained by the following equation.
Scale position = {(log scale value-SCL lower limit) / (SCL upper limit-SCL lower limit)} * Display span
+ Start point display position (6)
However, SCL upper limit = log (scale upper limit)
SCL lower limit = log (scale lower limit)

The scale value at the left end of FIG. 6 (A) is 5 × 10 ¹ , and the scale position is the 0th dot from the formula (6) as follows.
Scale position = {(log (5E1) −1.69897) / (5.30103−1.69897)} * 639 + 0
= 0

The next scale value of 5 × 10 ¹ is 6 × 10 ¹ , and the scale position is the 14th dot as follows.
Scale position = {(log (6E1) −1.69897) / (5.30103−1.69897)} * 639 + 0
≒ 14

The scale position of the scale value 1 × 10 ⁵ near the right end is the 586th dot as follows.
Scale position = {(log (1E5) −1.69897) / (5.30103−1.69897)} * 639 + 0
≒ 586

The scale position of the scale value 2 × 10 ^{5 at} the right end is the 639th dot as follows.
Scale position = {(log (2E5) −1.69897) / (5.30103−1.69897)} * 639 + 0
= 639

  For example, when the interval between the scales is narrow, the scales are thinned to make it easy to see.

b) “LOG2” mode (FIG. 6B)
The position of the master scale on the X axis side (positions 10 ² , 10 ³ , 10 ⁴ , 10 ⁵ ) is obtained.
Parent scale position = {(Master index-Scale lower limit index) / (Scale upper limit index
-Scale lower limit index)} * Display span + Start point display position (7)

The parent scale at the left end of FIG. 6B is 10 ² , and the scale position is the 0th dot from the formula (7) as follows.
Scale position = {(2-2) / (5-2)} * 639 + 0
= 0

The parent scale next to the parent scale 10 ² is 10 ³ , and the position of the scale is 213 dots as follows.
Scale position = {(3-2) / (5-2)} * 639 + 0
= 213

The parent scale next to the parent scale 10 ³ is 10 ⁴ , and the position of the scale is 426 dots as follows.
Scale position = {(4-2) / (5-2)} * 639 + 0
= 426

The parent scale at the right end is 10 ⁵ , and the scale position is the 639th dot as follows.
Scale position = {(5-2) / (5-2)} * 639 + 0
= 639

As shown in FIG. 6B, the child scales are displayed with the parent scales divided into nine equal parts.
Further, for example, when the scale interval is narrow, the scale is thinned to make it easy to see.

  According to such a configuration, as shown in FIGS. 4 and 6, “LOG1” mode for displaying a scale in which the parent scales are logarithmically divided and a scale in which the parent scales are equally divided into nine are displayed. Since it can be selected and set in any of the “LOG2” modes, it is possible to flexibly cope with it regardless of the output format of the converter.

In the above description, the display position of the paperless recorder has been described. However, the present invention can also be applied to the trend recording position of a chart recorder that records the trend of measured values on recording paper. That is, the trend recording position of the chart recorder can be obtained by substituting the following values of the chart recorder into the display span and the starting point display position of the above-described equation (1).
Display span: (100% position on chart paper-0% position on chart paper)
Start point display position: (0% position on chart paper-reference position)
Digital value calculation and alarm detection are the same as the paperless recorder.

  As described above, according to the present invention, a paperless recorder capable of displaying an arbitrary grid with a simple setting operation can be realized.

DESCRIPTION OF SYMBOLS 1 Measurement part 2 Control part 3 Memory 3a Measurement data storage part 3d Setting data storage part 4 Display position calculation part 41 Trend calculation part 5 Time deviation calculation part 6 Display control part 7 Display part

Claims (4)

In a recorder that measures a measurement signal that varies as a function of logarithm,
A recorder characterized in that a first scale in which the parent scales are logarithmically divided and a second scale in which the parent scales are equally divided can be selected.   2. The recorder according to claim 1, wherein the recorder is either a paperless recorder using a two-dimensional display instead of recording paper or a chart recorder using recording paper.   Set and input the channel number, calculation mode corresponding to the scale, measurement range, input range, scale value for the input range, and alarm parameters necessary to generate one of the scales selected for each measurement channel. The recorder according to claim 1 or 2, further comprising a screen and a memory for storing values of these parameters.   The recorder according to any one of claims 1 to 3, wherein the measurement signal is measured at every measurement period, and the measurement data is converted into a digital value composed of a mantissa value and an exponent value and displayed and stored.

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