JPH10177411A - Digital panel meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the area of an operation panel and also to easily set a measurement range and a permission range so as to recognize the ranges by providing first and second push buttons in the operation panel. SOLUTION: Two push buttons A and B are fitted to the operation panel in addition to a display equipment 18. The measurement upper limit valule and the measurement lower limit value of the measurement range and the alarm upper limit value and the alarm lower limit value of the permission range are stored in the setting value table 24 of a limit value setting part 22. When the button A is pushed, one limit valule in the table 24 is displayed in the display equipment 18 in a slow flicker state with a display control circuit 14. When the respective limit values are set, the button A is operated by double- clicks and the sign of one limit value, one digit position and the value (d) of the digit are slow-flicker-displayed. When the button A is repeatedly pushed so as to display the value (d) of the digit of an item desired to be set, the button B is repeatedly pushed until (d) becomes the value desired to be set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital panel meter which converts an analog input data into a digital value, displays the digital value on a display attached to an operation panel, and outputs an alarm when the input data is out of an allowable range.

[0002]

2. Description of the Related Art In a central monitoring room for monitoring and controlling the operation of various plants such as factories, building facilities, and water and sewage facilities,
A digital panel meter is provided which converts analog input data from a measuring device for measuring the operation state of various devices installed in the plant into a digital value and displays the digital value.

Since the number of input data that needs to be monitored in the central monitoring room is very large, the digital panel meter is fixedly fitted in a control panel (console panel) of the central monitoring room. Therefore, it is preferable that the operation panel exposed on the console panel surface of each digital panel meter has as small an area as possible.

Further, in order to monitor an abnormal operation state of a device to be monitored, not only the numerical value of the input data but also an alarm is output when the input data is out of a preset allowable range. Since the allowable range has a different value for each device to be monitored, it is possible to arbitrarily change the setting on the operation panel on the front even after attaching the digital panel meter to the console panel. is necessary.

FIG. 11 is a block diagram showing a schematic configuration of a digital panel meter having the above-described functions.
FIG. 3 is a diagram showing an operation panel on the front side of the digital panel meter.

In FIG. 11, a DC analog input signal of, for example, 4 to 20 mA input from a measuring device of a monitoring symmetrical device is input to an input circuit 1 and then scaled by a scale conversion circuit 2 to obtain new input data. D is converted into a digital value by the A / D conversion circuit 3. The digital input data D output from the A / D conversion circuit 3 is shown in FIG.
The display is output on a display 5 composed of, for example, an LED or the like incorporated in the operation panel 4 on the front of the device 2.

[0007] Digital input data D output from the A / D conversion circuit 3 is input to a comparison determination circuit 6.
The comparison determination circuit 6 receives the upper limit value PD of the allowable range from each of the digital switches 7 and 8 incorporated in the operation panel 4.
_H and the lower limit value PD _L is input. Comparison determination circuit 6 compares the input data D and the upper limit value PD _H and the lower limit value PD _L, the input data D exceeds the upper limit value PD _H when the upper limit alarm A
Outputs R _H, the input data D and outputs the lower limit alarm AR _L falls below the lower limit PD _L.

[0008] Since each digital switches 7 and 8 are attached to the front surface of the operation panel 4 of the digital panel meter, monitoring personnel as required, tolerances each alarm AR _H, AR _L is outputted example 4-digit upper limit value PD _H and the lower limit value PD _L easily can be set and changed wardens central monitoring room.

[0009]

However, FIG.
Also, the digital panel meter shown in FIG. 12 has the following problems to be improved. That is, as described above, each digital panel meter is incorporated in the console panel of the central monitoring room, and only the operation panel 4 is exposed at the front of the console panel. Therefore, it is necessary to reduce the actual area of the operation panel 4 as much as possible.

On the other hand, since the monitoring personnel it is necessary to increase the area of the display 5 for clarity of input data values of the digital, setting the four-digit or more the upper limit value PD _H and the lower limit value PD _L Since the digital switches 7 and 8 occupying a large area, which are not operated in the normal monitoring operation, must be incorporated, there is a problem that the area of the display 5 itself cannot be set large.

Also, of the input signals input from the external measuring device to the input circuit 1, the input signal components within the measurement range preset by the scale conversion circuit 2 are used as new input data in the next A / D conversion circuit. 3 is input. In other words, in each digital panel meter, a voltage range of a signal signal level that can be taken by a corresponding signal is designated as a measurement range in accordance with a type of a signal output from the measurement device, and a signal included in the measurement range is extracted. By performing amplification and A / D conversion, it is possible to prevent a signal caused by a failure of the measuring device itself, not an abnormality of the monitored device, from being input to the digital panel meter.

However, in the digital panel meter shown in FIG. 11, the measurement range set in the scale conversion circuit 2 is a semi-fixed value. This measurement range could not be easily changed. Also, there is no way to confirm the measurement range that has already been set.

The present invention has been made in view of such circumstances, and by providing two push buttons,
The area of the front operation panel can be reduced, the measurement range and allowable range can be easily set, the set measurement range and allowable range values can be easily checked, and the warning when the allowable range is exceeded can be visually checked. It is intended to provide a digital panel meter.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a data display output means for converting analog input data into a digital value and displaying the digital value on a display attached to an operation panel; A first push button and a second push button mounted near a display on an operation panel, and a measurement of input data in a digital panel meter having an alarm output means for outputting an alarm when the value is out of an allowable range. A set value table in which areas for storing upper and lower limits of a range and upper and lower limits of an allowable range of input data are formed, and a combination of a first push button and a second push button is operated. Accordingly, a value setting means for setting each upper limit value and each lower limit value in each area of the set value table, and setting in the set value table only by the push button operation of the first push button. And a setting value display means for sequentially displaying output on the display of each lower limit and the upper limit value.

According to another aspect of the present invention, the alarm output means in the digital panel meter according to the invention described above displays the input data when the input data exceeds the upper limit of the allowable range and when the input data falls below the lower limit of the allowable range. The flicker is displayed above. Further, the set value display means flickers each lower limit value and each upper limit value on the display.

Further, in another invention, the value setting means is started and ended in response to a double click operation of the first push button or the second push button. In the digital panel meter configured as described above, the set value table stores the upper limit value and the lower limit value of the measurement range of the input data, and the upper limit value and the lower limit value of the allowable range of the input data. The stored contents of the set value table are stored in the first and first operation panels provided on the operation panel on the front of the digital panel meter.
Settings and changes can be made by operating a combination push button of the second push button. Further, the upper limit value and the lower limit value of the measurement range and the allowable range stored in the set value table can be displayed on the display unit by operating the first push button.

Since the area occupied by the push buttons is small, the area of the operation panel can be reduced. Further, the setting of the measurement range becomes easy, and the set values of the measurement range and the allowable range can be easily confirmed.

In another invention, when the input data is out of the allowable limit, the display state of the input data changes from the normal continuous display to the flicker display, so that the observer can easily confirm. In addition, even while checking each set value, the set value is displayed as flicker, so that it is not mistaken for the input data.

Further, in another invention, the setting operation of each value in the setting value table is started and ended by a double-click operation on the push button. Therefore, the setting operation of each limit value can be simplified.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a digital panel meter according to one embodiment of the present invention.
FIG. 2 is a diagram showing an operation panel on the front of the digital panel meter.

In FIG. 1, a DC analog input signal of, for example, 4 to 20 mA input from a measuring device of a monitoring symmetric device is input to an input circuit 11 and then scaled and converted by a scale conversion circuit 12 to obtain new input data. D is converted to a digital value by the A / D conversion circuit 13. A /
Digital input data D output from the D conversion circuit 13
Is input to the display control circuit 14 and the comparison determination circuit 15.

In a normal state where no display command is input from the limit value setting section 22, the display control circuit 14
The input data D input from the conversion circuit 13 is displayed and output on a four-digit display 18 composed of, for example, an LED or the like incorporated in an operation panel 17 on the front of the digital panel meter shown in FIG.

The display panel 17 is provided with two push buttons 19 (A button) and 20 (B button) in addition to a display 18 for displaying four-digit alphanumeric characters. When the observer presses each of the push buttons 19 and 20, the push button operation signal is sent to the limit value setting unit 2 via the push button input circuit 21.
2 is input. Each of the push buttons 19 and 20 can perform a normal click operation to be pressed once and a double click operation to be pressed twice in a short time, similarly to a mouse operation in a personal computer.

The limit value setting section 22 is composed of a kind of computer. The internal storage section 23 has a setting value table 24, a setting flag 25, a check item counter 26, a setting item counter 26 as shown in FIG. An item digit position counter 27 and the like are formed.

In the set value table 24, the measurement upper limit value AD _{H of} the measurement range, the measurement lower limit value AD _{L of} the measurement range, and the alarm upper limit value PD which is the upper limit of the allowable range are set for each of the setting item numbers 1 to 4. _H, alarm limit value PD _L which is the lower limit of the allowable range is stored.

The limit values AD _H , AD _L , PD _H ,
PD _L is made up of 4 digits. The limit value setting unit 22
The measurement upper limit AD _H and the measurement lower limit AD _L of the measurement range set in the set value table 24 are sent to the scale conversion circuit 12. Scale conversion circuit 12, when the input data D input from the input circuit 11 is outside the measurement range shown by this measurement upper limit value AD _H and the measured lower limit AD _L, it is determined that the failure of the measuring device itself The input data D is cut off and not sent to the A / D conversion circuit 13.

Further, the limit value setting unit 22 sends the an alarm limit PD _H tolerance set in the setting value table 24 and the alarm limit value PD _L to the comparison decision circuit 15. The comparison determination circuit 15 calculates the input data D input from the A / D converter 13, the alarm upper limit value PD _{H of the} allowable range, and the alarm lower limit value P.
When the input data D is out of the allowable range by comparing with D _L , an alarm output signal h is sent to the alarm output circuit 28.

The alarm output circuit 28 outputs an upper limit alarm AR _H when the input data D exceeds the upper limit PD _H based on the alarm output signal h, and outputs a lower limit alarm AR when the input data D falls below the upper limit PD _H. Output _L. Further, when the alarm output circuit 28 receives the alarm output signal h from the comparison determination circuit 15, it sends out a flicker display signal g to the display control circuit 14.

When the flicker display signal g is input, the display control circuit 14 changes the display form of the 4-digit input data displayed on the display 18 to a flicker display that blinks at a constant cycle.

Next, each limit value AD of the limit value setting section 22 is set.
_H, AD _L, PD _H, press each of the PD _L button 19, 20
The setting operation using is described. Setting flag 25 provided in the storage unit 23, a flag indicating the threshold values AD _H for setting value table 24, AD _L, PD _H, whether in setting operations PD _L. Check item counter 26
Is the limit value AD set in the set value table 24.
_The counter indicates which limit value among _H , AD _L , PD _H , and _P DL is displayed on the display 18.

That is, as shown in FIG.
Each of the count values CN _{A in} [4] is the respective limit value AD.
_H, corresponding to the AD _L, PD _H, number of PD _L. In addition,
The count value CN _A (CN _A = 0) of [0] indicates that the measurement data D is displayed instead of each limit value.

The setting item digit position counter 27 has four limit values AD _H , AD _L , PD _H , and PD _L each consisting of four digits.
Is a counter indicating which digit position of the value d of the total 16 digits (4 × 4 = 16) is currently being executed. For example, as shown in FIG. 7, if the count value CN _b is [0] indicates the first digit of the measurement upper limit value AD _H, if the count value CN _b is [1] 2-digit measurement upper limit value AD _H shows the eye, if the count value CN _b is [2] indicates the third digit of the upper measurement limit value AD _H, if the count value CN _b is [3] shows the fourth digit of the upper measurement limit value AD _H.

Similarly, the count value CN of [4] to [7]
_b indicates the first to fourth digits of the lower limit of measurement AD _L , respectively.
[8] to [11] the count value CN _b represents a 1-4 digit of each alarm limit PD _H of [12] - count CN _b is 1 for each alarm limit value PD _L [15] 4
Indicates the digit.

The limit value setting section 22 responds to the push button operation of each of the push buttons 19 and 20, and sets the limit values AD _H , AD _L , PD _H , and PD _H for the set value table 24 in accordance with the flowcharts of FIGS. to implement the process of setting the PD _L.

In S (step) 1 of the flow chart of FIG. 4, when one of the push buttons 19, 20 is pressed, the push button operation is performed by the A button (push button 19).
If the operation is a normal push button operation (S2), the state of the setting flag 25 is checked. If the setting flag 25 has been released to [0] (S3), it is determined that the operation is in progress to check each limit value already set in the set value table 24.

Then, the process proceeds to S4, where the confirmation item counter 2
Update 6 count value CN _A of (CN _A = CN _A +
1). When it is confirmed that the updated count value CN _A does not exceed the set value 4 of the limit value (S5), one of the limit values AD _H , AD _L , of the number designated by the count value CN _A in the set value table 24. PD _H, and displays slow flickering state on the display 18 via the display control circuit 14 a PD _L (S6).

At S5, the updated count value CN
_{When A} exceeds the set value 4 of the limit value, the count value CN _A is initialized to 0 (CN _A = 1), and the transmission of the limit value to the display control circuit 14 is stopped. As a result, the input data D
Is continuously displayed on the display 18 as it is (S8).

Further, in S3, if it is set in the setting flag 25 is [1], the threshold values AD _H for setting value table 24, AD _L, PD _H, to be in setting operations PD _L to decide.

In this case, the process proceeds to S9, where the count value CN _B of the setting item digit position counter 27 is updated (CN _B = C
N _B +1). When the updated count value CN _B exceeds the total number of digits 15 of all the set limit values, in S11, the count value CN _B is returned to the initial value of [0] (CN _B = 0).

Next, in S12, one of the limit values AD _H , AD _L , P designated by the count value CN _B shown in FIG.
D _H, throw flicker displays the two-digit symbol and the specified digit position and value d of the corresponding digit of PD _L to display 18.

Note that, as shown in FIG.
_H is indicated by the symbol [AH], the measurement lower limit AD _L is indicated by the symbol [AL], and the alarm upper limit PD _H is indicated by [P
Is displayed in symbol H], alarm limit value PD _L is displayed in the symbol of [PH].

In step S2, if the operation is not the normal push button operation on the A button (push button 19) but the normal push button operation on the B button (push button 20) in S13 in FIG. It is confirmed that the flag 25 is set to [1] (S14).

Then, in S14, 1 is added to the value d of the designated digit position currently displayed on the display 18 (d = d + 1).
When the value d after the addition exceeds 9 (S16), the value d is initialized to an initial value [0] (S17). The updated value d is written as the value d in the designated digit position of the designated limit value in the setting value table 24 (S18).

If it is determined in step S13 that the normal push button operation is not performed on the B button (push button 20), but in step S19 the double click operation is performed on the A button (push button 19), the process proceeds to step S20 and the setting flag is set. Check the status of 25.

If the setting flag 25 is [1], it is determined that the task of setting the limit values AD _H , AD _L , PD _H , and _{P L} is to be ended. Then, set the initial value of unset flag 25 to [0] (S21), the count value CN _A confirmation item counter 26 [0] (S22). As a result, as described above, the input data D is continuously displayed and output on the display 18 as it is (S23).

[0046] When the setting flag 25 is set to [0] is newly the threshold values _{AD H, AD L, PD H} , determines to start setting operations PD _L. Then, by setting the set flag 25 in [1] (S24), it sets the count value CN _B of the setting item column position counter 27 to an initial value of [1] (S25). Thereafter, in S26, the set upper limit AD _H specified by the count value CN _B of [1] shown in FIG.
[AH] symbol, the first digit [1] and the value of the digit d
Is displayed on the display 18 in a slow flicker display (S26).

In the digital panel meter configured as described above, the set value table 24 of the storage unit 23 stores the upper limit value AD _H , the lower limit value AD _L of the measurement range, the alarm upper limit value PD _{H of the} limit range, and the alarm lower limit value PD. _When setting _L , first, the A button (the push button 19) is double-clicked. Then, as shown in FIG. 7, one limit value symbol, one digit position, and the value d of the digit are displayed on the display 18 in a slow flicker manner.

Next, the A button (the push button 19) is repeatedly pressed until the symbol and the digit position of the setting item to be set are displayed. When the digit value d of the item to be set is displayed, the B button (the push button 20) is repeatedly pressed until d reaches the value to be set.

To set the value d of the next digit, the user presses the A button push button 19) to display the value d of the next digit.
As described above, the limit values AD _H , AD _L , and P are stored in the set value table 24 by the combination of the A button (the push button 19) and the B button (the push button 20).
D _H, continue to set the PD _L. When the necessary limit value setting processing is completed, when the A button (the push button 19) is double-clicked, the original input data D is continuously displayed on the display 18.

[0050] Further, the threshold values AD _H set in the setting value table 24, AD _L, PD _H, To check the PD _L, by depressing repeated A button (push button 19) in normal operation The upper limit value AD _H and lower limit value AD _{L of} the four-digit measurement range, and the alarm upper limit value PD _H and the alarm lower limit value _P DL of the four-digit limit range are displayed on the display 18 in slow flicker in order. When the display is to be erased, the input data D is continuously displayed when the slow flicker state is stopped by repeatedly pressing the A button (the push button 19).

Thus, the two push buttons 19, 20
Of the set value table 24
, Each limit value of the measurement range and each limit value of the permissible limit can be individually set. Further, each limit value set in the set value table 24 can be easily confirmed on the display 18 as necessary.

Therefore, the operating state of the controlled device can be grasped more accurately. Further, when the input data is out of the allowable range, the display state of the input data D displayed on the display 18 changes from the normal continuous display to the slow flicker display. Can be grasped.

The area occupied by the push buttons 19 and 29 on the operation panel 17 is much greater than the area occupied by the digital switches 7 and 8 on the operation panel 17 in the conventional digital panel meter shown in FIG. Can be smaller. As a result, the required area of the operation panel 17 can be further reduced.

The present invention is not limited to the above embodiment. In embodiments, the limit value of the allowable range, but the two types of alarm limit PD _H and alarm limit value PD _L, as shown in FIGS. 8 and 9, the alarm limit value P
Other D _H and alarm limit value PD _L, it is possible to additionally set an alarm limit PD _H higher alarm on upper limit PD _HH, and a warning lower limit PD _L lower alarm under the lower limit PD _LL . In this case, the setting method of each limit value can be set by a combination push button operation according to the combination push button operation of the two push buttons 19 and 20 described above.

Further, the limit values PD _HH ,
The symbols of PD _H , PD _L , and PD _LL may be defined as [HH], [H], [L], and [LL] as shown in FIGS.

Then, the set limit values PD _HH , PD
_H, PD _L, PD _LL is sent to the comparing and determining circuit 15.
When the input data D is out of the allowable range, the comparison determination circuit 15 sends an alarm output signal h to the alarm output circuit 28.

[0057] alarm output circuit 28, when only the alarm limit value PD _L and alarm limit PD _H is set, FIG. 10
As shown in the column 29a, the input data D is displayed in slow flicker when the value is out of the limit value. On the other hand, four limit values PD
_HH, PD _H, PD _L, if the PD _LL has been set,
As shown in the columns 29b and 29c in FIG.
Outside D _H and alarm limit value PD _L, the input data D as well as slow flickering, and the input data D is further alarm on the upper limit value PD _HH Outside alarm under the lower limit value PD _LL, Quick flickering.

As described above, the upper limit and the lower limit of the permissible limit are warned in two stages having different display forms, so that
It is possible to alert the observer more effectively.

[0059]

As described above, in the digital panel meter of the present invention, two push buttons are provided, and based on the combined push button operation of the two push buttons, the measurement range and the allowable range are set for the set value table. The upper and lower limits are set, and the set contents of the set value table are displayed and output by operating a push button.

Therefore, the area of the front operation panel can be reduced, the measurement range and the allowable range can be easily set, the set measurement range and the set value of the allowable range can be easily confirmed, and the value is out of the allowable range. You can see the warning of the time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a digital panel meter according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operation panel of the digital panel meter.

FIG. 3 is a diagram showing contents stored in a storage unit of a limit value setting unit in the digital panel meter.

FIG. 4 is a flowchart showing an operation of setting each limit value of the limit value setting unit.

FIG. 5 is a flowchart showing the setting operation of each limit value of the same limit value setting unit.

FIG. 6 is a view showing a display order of limit values displayed on a display of the digital panel meter.

FIG. 7 is a diagram showing the display order of each digit of the limit value displayed on the display unit when the limit value setting unit sets each limit value.

FIG. 8 is a diagram showing a setting state of an allowable range of a digital panel meter according to another embodiment of the present invention.

FIG. 9 is a diagram showing a setting state of an allowable range of a digital panel meter according to another embodiment.

FIG. 10 is a diagram showing a comparison of display states of alarms according to another embodiment.

FIG. 11 is a block diagram showing a schematic configuration of a conventional digital panel meter.

FIG. 12 is a diagram showing an operation panel of the conventional digital panel meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Input circuit 12 ... Scale conversion circuit 13 ... A / D return circuit 14 ... Display control circuit 15 ... Comparison judgment circuit 17 ... Operation panel 18 ... Display 19 ... Push button (A button) 20 ... Push button (B button) 21: Push button input circuit 22: Limit value setting unit 24: Set value table 28: Alarm output circuit

Claims (3)

[Claims] 1. Data display output means for converting an analog input data into a digital value and displaying it on a display attached to an operation panel, and an alarm output means for outputting an alarm when the input data is out of an allowable range. A first push button and a second push button attached to the operation panel near the indicator, an upper limit value and a lower limit value of a measurement range of the input data, and the input. A set value table in which an area for storing an upper limit value and a lower limit value of the allowable range of data is formed; and a set value table of the set value table in accordance with a combination push button operation of the first push button and the second push button. Value setting means for setting the upper limit value and the lower limit value in each area; and setting in the set value table only by a push button operation of the first push button. Digital Panel Meter equipped with a set value display means for sequentially displaying and outputting the lower limit and the upper limit value to the display. 2. The alarm output means flickers the input data on the display when the input data exceeds an upper limit value of the allowable range and when the input data falls below a lower limit value of the allowable range. 2. The digital panel meter according to claim 1, wherein the set value display means flickers the lower limit value and the upper limit value on the display. 3. The digital panel meter according to claim 1, wherein the value setting means starts and ends in response to a double-click operation of the first push button or the second push button. .