JPS6274101A - Digital controller - Google Patents

Abstract

PURPOSE:To improve the operability by providing a display means of a process variable value, etc., and each change means of an operation mode, etc., on a front panel, and setting this function and a parameter by only an operation of the front panel. CONSTITUTION:A digital controller 30 is provided with a panel surface 31 on the front, and only a power source switch 21, a connector 23 for maintenance, a fuse 24, a battery 25 and a switch group 26 on the side face. This panel surface 31 is provided with an LED bar graph 32(32a-32c) for indicating a PV (process variable) value, etc., an indicating meter 34 consisting of each separate LED33, a numeral indicator 35, a numeral and item indicating LED36, an SV (desired set value) setting switch 37(37a,37b), a changeover switch 38(38a, 38b) of an operation mode, a manual operation switch 39(39a, 39b), and an FAST/SEL switch 40. In this way, by seeing the indicating parts 34-36 of the panel surface 31 and operating the switches 37, 40 setting of a function of the controller 30 and setting of a parameter can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a digital controller used for process instrumentation and the like.

[Technical background of the invention]

Generally, when producing large quantities of the same product from a plant, stabilizing quality is an issue. This quality is closely related to process operating conditions, and usually the process variables such as temperature, pressure, flow rate, and liquid level (hereinafter abbreviated as Pv value) match the desired set value (hereinafter abbreviated as SV value). By controlling this, quality is indirectly stabilized.

The digital controller performs control calculations on the manipulated output value (hereinafter referred to as MV value) so that the PV value matches the Sv value, and this MV value is sent to the operating end of the control valve. This affects the PV value.

For example, as shown in FIG. 6, for the flow rate Fa, Fb=a
When controlling the ratio of the flow rate Fb so that Fa + β, in an analog way, the ratio setter 2 sets aFa + β to the flow rate Fa detected by the flow rate detector 1 using the parameters of ratio α and bias β. The calculation result is limited by the limiter 3, and this value becomes the Sv value. Then, a control calculation is performed in the controller 4 so that the flow rate Fb, that is, the PV value detected by the flow rate detector 5 matches the above-mentioned SV value, and the calculation result, that is, the MV value is output to the control valve 6. and the control valve 6 is adjusted.

The digital controller calculates these ratios.

The limiter and control calculations are all executed in one machine.

Therefore, the flow iF detected by each flow rate detector 1.5
In order to process a, Fb, that is, analog input, it is necessary to set what functions to provide and what parameters to operate with.

FIG. 7 is a diagram showing an example of functional construction of the digital controller 10 for executing the ratio control described above. In other words, the flow rates Fa and Fb are determined by the differential pressure transmitter.
Since the signal is input to the digital controller 10 as a signal proportional to the square root calculation module lla, ll
b is set, and thereby the signal is linearized by square root calculation. Next, the ratio calculation module 12 in which the desired ratio α and bias β are set is set, and the flow EnF
A ratio calculation is performed on the b-system signal. Furthermore, the limiter module 13 in which the limit value is set is set, and 1-recorded flow rate F is set.
Add restrictions to b-system signals.

By the way, the operation mode of the digital controller is as follows:
Cascade mode (hereinafter referred to as C) in which the SV value is given externally
mode), an automatic mode (hereinafter referred to as A mode) that operates using the local Sv value, and a manual mode (hereinafter referred to as M mode) in which the operator directly operates the MV value.

Therefore, the switch module 14 is set to select contact S1 when operating in C mode, and select contact S2 when operating in A mode.

When contact S1 is selected, aFa+β becomes the Sv value, that is, ratio control is performed. On the other hand, when the contact S2 is selected, the SV value is determined by the local SV value set by the panel surface of the digital controller 10 or the keyboard.
In other words, the flow rate Fb is controlled by the actual value.

Then, set the PID calculation module 15 in which proportional (P), integral (I), and differential (D) parameters are set,
The linearized flows ti and Fb are taken as Pv values, compared with the above Sv values, and the deviation thereof is subjected to PID control calculation to determine the MV value.

By the way, in order to construct the above-mentioned functions, necessary information is written into the system FROM using a separate device called a system loader, and this information is transferred to the digital controller 10.
I was wearing it on the

FIG. 8 is a side view showing the external appearance of the conventional digital controller 10, and as shown in the figure, the system P
ROM20 is attached to the side of the controller. Then, when the power switch 21 is turned on, the system FRO
The contents written in M20 are transferred to the RAM in the controller, and the controller operates accordingly. Also,
Parameter settings and changes are performed by key operations on the keyboard 22. In addition, in FIG. 8, 23 is a maintenance connector, 24 is a fuse, 25 is a battery, and 2
6 is a switch group.

[Problems with background technology]

As described above, the conventional digital controller 10 requires special equipment such as a system loader to construct functions, and also requires a keyboard to set and change parameters, resulting in high costs.

Further, generally, the digital controller 10 is arranged with only the front panel exposed, and the other parts are housed in a case or the like.

Therefore, when setting functions and parameters, etc., it is necessary to pull out the digital controller 10 from the case, etc., and then install the system PROM 20 and operate the keyboard 22, which is not only troublesome but also extremely difficult to operate. It had become a bad thing.

[of the invention]

The present invention was made based on these circumstances,
The purpose is to provide a digital controller that allows functions and parameters to be set only by operating the front panel, improves operability, and can be realized at low cost.

[Summary of the invention]

In order to achieve the above object, the present invention provides display means that can display at least one of a process variable value, a set value, and a manipulated output value, and each changing means that changes the set value, the manipulated output value, and the operation mode. is provided on the front panel, the function setting mode or the parameter setting mode is entered by any one of the above-mentioned changing means or a combination thereof, and the display means and any one of the above-mentioned changing means or a combination thereof are operated. The function or parameter is displayed and set by the above-mentioned changing means, and the function setting mode or the parameter setting mode is canceled by operating any one of the changing means or a combination thereof.

[Embodiments of the invention]

FIG. 1 is a perspective view showing the external configuration of a digital controller 30 in one embodiment of the present invention.

This digital controller 30 has a panel surface 3 on the front.
1, and a power switch 21. on the side. Maintenance connector 23. Fuse 24. Battery 25, switch group 2
Only 6 are provided.

FIG. 2 is a plan view showing the structure of the panel surface 31. As shown in FIG.

This panel surface 31 shows Pv values and Sv values.

LED bar graphs 32a, 3 each indicating the MV value
2b, 32c, and an indicator 34 consisting of individual LEDs (HALT display, ALARM display, computer/local display, remote manual display) 33 that display the status of the controller, and digitally display the PV value, Sv value, and MV value as appropriate. numeric display 35, and a numeric display item display LED to inform you of the items displayed on this numeric display 35 (for example, red when the PV value is displayed, green when the Sv value is displayed, and turned off when the MV value is displayed) ) 36 and Sv for setting and changing the local Sv value in A mode.
v constant switches 37a, 37b, and mode changeover switches 38a, 38b for switching the operation mode to C mode, A mode, and M mode, respectively.

38c, manual operation switches 39a and 39b that operate the MV value in M mode, and this manual operation switch 39a.
, FAST/SEL switch 40 which increases the speed of change in manual operation when used simultaneously with 39 b, and changes the item displayed on the numerical display 35 from the Pv value to the SV value and then to the MV value when used alone, etc. It consists of

In addition, the LED bar graph 3 in the indicator 34
A digital controller 3 is installed on the scale plates 2a to 32c.
Abbreviation symbol 41 required for function setting and parameter setting of 0
are printed corresponding to the setting items. For example, abbreviations for specifying the type of digital controller 30, ie, one-person car output PID controller rPIDJ, SV
A PID controller with a value list [R-8VJ etc. is printed on the top and has abbreviations for specifying functions, such as opening/closing calculation module rROTJ, limiter module rLM
TI, etc. are printed in the middle, and are abbreviations for parameter setting, namely deviation alarm setting value rDVJ and PVD calculation differential time rTDJ.

The integral time rTIJ and P of the PVDV calculation, the proportional gain rKPJ of the ID calculation, etc. are printed at the bottom. Furthermore, the wiring symbol 41 is printed in a color that is less conspicuous than the numbers or scale marks on the scale plate, and care has been taken so that the abbreviated symbol 41 is almost invisible when viewing the indicator 34 from a slightly distant position. has been done.

FIG. 3 is a block diagram showing the main parts of the system configuration in this embodiment. In the same figure, 51 is analog human power P
This is an A/D converter that converts VI and PV2 into digital quantities, and the signal digitally converted by this A/D converter 51 passes through a path line 52 and is sent to the CPU 53.
given to.

This CPU 53 executes control calculations on the input from the A/D converter 51 based on desired functions and parameters written in the ROM of the memory 54, and the result of this control calculation, that is, the MV value is MV value output section 55
is output to the controlled unit. 56 is a panel controller circuit, and each switch 3 on the panel surface 31
Input the signal from 6 to 4 degrees and pass through the pass line 52 to C
It has a function of outputting to the PU 51 and a function of controlling display on each of the display sections 34 to 36 based on commands from the CPU 51. Then, via this panel controller 56,
Based on the signals input to the PU 53, the functions and parameters of the controller written in the ROM of the memory section 54 can be set.

Hereinafter, the processing form of the CPU 53 will be explained with reference to the flowchart shown in FIG. The CPU 53 determines the presence or absence of a signal indicating a command to shift to a function setting mode or a parameter setting mode from a signal constantly inputted via the panel controller 56 (step (hereinafter abbreviated as ST)).
1).

If there is no signal indicating a mode transition command, normal arithmetic control processing is executed (Sr1). On the other hand, when a signal indicating this mode transition command is input, the mode first transitions to the parameter setting mode (Sr3). Next, when a signal indicating a mode shift command is input again (Sr1), the mode shifts to the function setting mode (Sr1). Thereafter, each time a signal indicating a mode transition command is input manually, the parameter setting mode and the function setting mode are alternately switched.

On the other hand, when a signal indicating a command to cancel the function and parameter setting mode is input from a signal input through the panel controller 56 during the parameter setting mode or function setting mode (Sr1), the mode shifts to the normal arithmetic processing mode, Arithmetic processing is executed (Sr1).

In this embodiment, the command to shift to the function setting mode or parameter setting mode is issued by the s■■ constant switch 37.
It is output by pressing both a and 37b at the same time. Further, a command to cancel the function setting mode or parameter setting mode is output by pressing the FAST/SEL switch 40. On the other hand, in the function setting mode or parameter setting mode, the panel surface 31
The SV value indicating LED bar graph 32b in is switched from a bar graph display to a point display, and indicates a predetermined abbreviation 41. Also, number display 3
5 displays a number necessary for function setting or parameter setting, and this number can be changed by operating the Sv value setting switches 37a and 37b.

Next, as an example of functions and parameter setting operations performed using the panel surface 31, a case of a controller that performs ratio calculation will be specifically described. When performing function settings, both Sv setting switches 37a and 37b are pressed twice at the same time. Then, you will enter function setting mode.
The LED bar graph 32b for indicating the SV value becomes a point display and indicates the abbreviation 4 which is the current controller setting type, for example rP I DJ, and at the same time, the type number 1 indicating the PID controller is displayed on the numerical display 35. Ru. Further, the LED 35 for displaying numerical display items lights up in red. Now, since ratio control is performed by the digital controller 30, the controller is a PID with Sv value list.
Controller rR-8VJ (type number 2) must be specified.

Therefore, when you press the S setting setting bit 37b, the lowest digit number displayed on the numeric display 35 (in this case "1"
”) flashes. Next, when the Sv value setting switch 37a is kept pressed, this blinking number increments. Therefore, when the number in this increment flashes "2", release the switch 37a. Then, "2" is displayed on the numeric display 36, and the SV instruction LED bar graph 32b points to the abbreviation 41, rR-8VJ.

Next, when the S■■ constant switch 37b is pressed, the setting is allowed, and the numerical display item display LED 36 changes from red to green. In this state, FAST/SEL switch 40
When you press , data "2" is set, and the above LED 36
changes from green to red and returns to display mode.

= 14 - Controller type, ie, PID controller with Sv value list After setting, detailed function settings are performed as shown in FIG. In other words, the presence or absence of various processes related to the controlled quantity PVI or the auxiliary analog human power PV2 is "0" (
(absent) and rlJ (present). The initial value is set in advance, and in this case it is "0".
”.

Here, when performing ratio control of the flow rate, it is necessary to change all the specifications shown in FIG. 5 from "0" to "1". This change from "0" to "1" may be performed in the same manner as in the type setting described above.

In other words, for example, when setting the opening/closing calculation module,
The switch 37b is pressed to make the least significant digit of the numeric display 35 blink, and then the switch 37a is kept pressed to increment the blinking digit, and when it reaches the number indicating the opening/closing calculation module, the switch 37a is released. Next, press the switch 37b again, and if the setting is allowed, the FA
Press the ST/SEL switch 40. In this way, the opening/closing calculation module is set.

In addition, the input PVI opening/closing calculation module setting or the input PVI
The opening/closing calculation module setting of V2 is distinguished by whether the point I/display is set to 1 point or 2 points. In other words, in the case of function selection regarding PVI input, the LED bar graph 32b' second point display is set as 1 point,
In the case of function selection related to PV2 manual power, the point display of the LED bar graph 32 b J: is set to 2 points.

After completing the controller type setting and detailed function setting as described above, the FAST/SEL switch 40 is pressed. Then, the mode shifts to normal arithmetic processing mode.

Next, when setting parameters, both Sv setting switches 37a and 37b are pressed once. Then, the parameter setting mode is entered, and the LED bar graph 32b or point display indicates the abbreviation 41 "KP", and at the same time the numerical display 35 indicates the current proportional gain, e.g. r2. OOJ is displayed, and the numerical display item display LED 36 lights up in red. Here, when changing the parameter setting items, press the Sv setting switch 37a. Then, the point display on the LED bar graph 32b moves upward, and thereby the numbers on the number display 35 are also displayed in accordance with the parameters.

On the other hand, when changing the parameter of the proportional gain rKPJ (initial value 2.00), for example, the S■ setting switch 37b is pressed. Then, the most significant digit that can be changed is “2”.
” flashes. Here, when the SV setting switch 37a is pressed, the flashing display number increments, so when the desired number flashes, the switch 37a is released. Also, S
When the v setting switch 37b is pressed, the blinking shifts to the lower digits in order by the number of times the switch is pressed, so when the number of the desired digit flashes, the switch 37a is pressed to increment the number to set the numerical value. Here, in the case of a parameter that includes a decimal point, if you press the Sv setting switch 37b and shift the digits of the blinking display number, after the lowest digit blinks, the decimal point will change to the highest digit and the second digit. The decimal point can be selected. If the SV setting switch 37a is pressed in this state, the position of the decimal point will shift from the left side to the right side, so the switch 37a is released at the desired position to set the position of the decimal point.

When the setting of the least significant digit or decimal point is completed in this manner, the SV setting switch 37b is pressed. Then, the numerical display item display LED 36 changes from red to green and becomes settable.

At this time, when the FAST/SEL switch 40 is pressed, the changed parameters are set and the numerical display item display L
ED36 returns to red.

After that, when the FAST/SEL switch 40 is pressed again, the normal arithmetic processing mode is restored.

As described above, according to this embodiment, the display sections 34 to 36 provided on the front panel surface 31 of the digital controller 30
By operating the switches 37a, 37b, and 40 while looking at the screen, functions and parameters of the controller can be set. Therefore, it is no longer necessary to operate the keyboard on the side of the controller or the system FROM to set functions and parameters as in the past, and all operations can be performed on the front panel surface 31, and the digital controller 30 can be removed from the case etc. There is no need to pull it out, which improves operability. In addition, special equipment such as a system loader is not required for function construction, and a keyboard for parameter setting is also unnecessary, making it possible to realize a low-cost digital controller. In this embodiment, the only additional component is printing simple abbreviations 41 on the LED bar graphs 32a to 32c, but this poses almost no problem in terms of cost.

Note that the present invention is not limited to the above embodiments.

For example, in the embodiment described above, transition to the function setting mode or parameter setting mode is performed using the SV setting switches 37a and 37.
Function and parameter settings are also performed by operating the Sv setting switches 37a and 37b based on the display contents of each display section 34 to 36, and returning to the normal arithmetic processing mode is performed by operating the FAST/SEL switch 4. Although the case is shown in which the operation is performed by the operation of 〇, the present invention is not limited to this, and the mode may be designed to be changed, set, or canceled by operating any switch group installed on the panel surface 31. good. Furthermore, a separate dedicated switch may be provided to transition to the function setting mode or parameter setting mode. By doing so, the SV setting switch 37a may be unnecessarily set while the digital controller 30 is executing normal arithmetic processing.

It is possible to prevent the possibility that pressing 37b would affect the processing, and there is no problem in terms of cost since only one switch is provided. Further, in the embodiment described above, a case was shown in which the abbreviation 41 was provided for instructing function settings and parameter settings, but this abbreviation 41 is not limited to the symbol in the embodiment described above, and the abbreviation 41 Other symbols may be used as long as they can function as an indicator. It goes without saying that various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

= 20 = As detailed above, according to the present invention, there is provided a display means capable of displaying at least one of a process variable value, a set value, and a manipulated output value, and a display means capable of displaying at least one of the set value, the manipulated output value, and the operation mode. The front panel is provided with respective changing means to change the function setting mode or parameter setting mode by any one of the changing means or a combination thereof, and the display means and the changing means or The function or parameter is displayed and set by the combination operation, and the function setting mode or parameter setting mode is canceled by any one of the changing means or a combination thereof, so that the function and parameter setting is It is possible to provide a digital controller that can be operated only by operating the front panel, improves operability, and can be realized at low cost.

[Brief explanation of drawings]

FIGS. 1 to 5 are diagrams showing an embodiment of the present invention,
Fig. 1 is a perspective view showing the external configuration, Fig. 2 is a front view showing the panel configuration, Fig. 3 is a block diagram showing the system configuration, Fig. 4 is a flow chart showing the processing form of the CPU, and Fig. 5 6 is a diagram showing a function setting example for executing ratio control, FIGS. 6 to 8 are diagrams showing conventional examples, FIG. 6 is a diagram for explaining general ratio control, and FIG. The figure shows an example of functional construction of a digital controller, and FIG. 8 is a side view of the digital controller. 30... Digital controller, 31... Panel surface, 32 a to 32 c-LED bar graph, 34-
・Indicator, 35 ・Numeric display, 36 ・Numeric display item display LED, 37 a, 37 b・-5V setting switch, 38a to 38c ・Mode setting switch, 39a, 39b ・・・Manual operation switch, 40...
FAST/SET switch, 41... Abbreviation symbol. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 6

Claims (2)

[Claims] (1) In a digital controller that compares a process variable value and a set value based on predetermined functions and parameters, and calculates and outputs a manipulated output value in response to the deviation,
a display means capable of displaying at least one of the process variable value, the set value, and the manipulated output value; a set value changing means that changes the set value, the manipulated output value, and the operation mode, respectively;
An operation output value changing means and an operation mode changing means are provided on the front panel, and the function setting mode or the parameter setting mode is entered by operating any one of the changing means or a combination thereof, and the display means and each of the changing means The function or parameter is displayed and set by any one of the above-mentioned means or a combination thereof, and the function setting mode or the parameter setting mode is canceled by any one of the above-mentioned changing means or a combination thereof. A digital controller featuring: (2) The digital controller according to claim (1), wherein the display means is provided with symbols necessary for setting functions and parameters.