JPS6367601A - Multi-setting type controller - Google Patents

Abstract

PURPOSE:To smooth a changing operation of the set control value and to prevent a heat shock and other faults caused by the change of the set value, by using a means which has the simultaneous selecting/setting jobs between the set control value and a control constant. CONSTITUTION:A set value selecting means 3a and a control constant selecting means 3b have switches 4 and 4 to select an optional value SP as well as a control constant PID corresponding to the set value SP to be selected with synchronism with the means 3a. Both switches 4 and 4 are mechanically coupled to each other and therefore both the value SP and the constant PID can be selected at a time. Furthermore the value SP and the constant PID can be simultaneously applied to a comparator 5 and an arithmetic circuit 6 respectively by connecting the switches 4 and 4 of means 3a and 3b to the comparator 5 and the circuit 6 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION - flr The present invention relates to a multi-setting type controller, and more particularly to a multi-setting type controller in which a set value of a controlled variable and a control constant can be easily changed simultaneously.

Referring to Fig. 1, in the conventional controller 1, the set value SP of control variables such as temperature can be changed using a key (not shown) on the surface of the 31m meter, and input A comparator 5 compares the measured value PV given to point 2 with this set value SP. The output of the comparator 5 is processed by the arithmetic circuit 6,
Generates output signal 00 to the controlled system. In order to prevent overshoot, speed up control, and otherwise optimize control characteristics, control constants in the arithmetic circuit 6, such as proportional band, integral time, differential time, etc., are adjusted in accordance with changes in the above set values. Manually adjusting the control constants each time is not only cumbersome, but also poses a risk of error due to operator error.

is trying to do it. Therefore, an object of the present invention is to simultaneously change the set value of the controlled variable and the control constant in the controller.

B. In order to achieve the above-mentioned object of controlling f, the multi-setting type controller 1 according to the first invention of the present application has a plurality of predetermined control variable setting values 5PI-SF3, as shown in FIG. (hereinafter sometimes collectively referred to as sp) and selectively applies any setting value among the plurality of setting values to the comparator 5; and the plurality of setting values 5PI. - Multiple control constants PIDI-PrI predetermined corresponding to SF3
)5 (Hereinafter, it may be collectively referred to as PID.)
A control constant selection means 3b is provided for storing a control constant corresponding to the selected set value among the plurality of control constants and applying it to the arithmetic circuit 6 in synchronization with the set value selection means.

Preferably, in order to prevent failures due to sudden changes in the controlled amount,
A lamp circuit 15 is connected between the set value selection means 3a and the comparator 5, and the set value SP
After converting a sudden change in to a gradual change, the comparator 5
to be applied.

As shown in FIG. 2, the control system according to the second invention of the present application includes a plurality of comparators each having a comparator that compares a set value and a measured value of a controlled variable, and an arithmetic circuit that performs arithmetic processing on the output of the comparator. This relates to a system consisting of controllers 1a-1c.
A set value set consisting of set values 5PI-9P5 (Figure 1) that should be simultaneously applied to the comparator 5 (Figure 1) of each controller in the control system and a set value set that is applied to the comparator of each controller in the control system. The arithmetic circuit 6 of the controller (Fig. 1) corresponds to the desired set value.
A comparator of the above-mentioned controller that stores a plurality of sets of controlled variables each consisting of control constants PIDI-PID5 (FIG. 1) to be applied to the controller, and selectively corresponds to an arbitrary set among the plurality of set value sets. A system setting means 10 is provided which simultaneously applies the control amount sets corresponding to the selected set value set to the arithmetic circuit of the corresponding controller.

To explain the operation using the embodiment shown in FIG. 1, the set value selection means 3a and the control constant selection means 3b are
"Selection of arbitrary set value (sp)" and "Selected set value (s
4. A switch for "selecting a control constant (PID) corresponding to p) in synchronization with the setting value selection means (3a)";
By mechanically interlocking the one-way switch 4.4, simultaneous selection of the set value (sp) and control constant (PID) is realized.
By connecting the switch 4 of the control constant selection means 3b to the arithmetic circuit 6, the set value (
sp) to the comparator 5" and "application of the control constant (PID) to the arithmetic circuit 6" at the same time.

Switch 4 of set value selection means 3a, control constant selection means 3
The mechanical interlocking means between the switch 4 and both suits 4.4 of FIG. 1 are not limited to the hardware shown in FIG. 1, but can also be achieved by software.

Enka 1 In the embodiment shown in FIG. 1, the comparator 5 compares the controlled variable set value SP selected by the set value selection means 3a and the controlled variable measured value Pv from the input point 2, and calculates the difference between them. Generate a corresponding difference signal. The arithmetic circuit 6 applies predetermined arithmetic processing to the difference signal from the comparator 5 using the control amount fiPID selected by the control constant selection means 3b, and generates a control signal that minimizes the difference. The output circuit 7 converts this control signal into an output signal OUT according to a certain signal system and applies this to the controlled system via an output point 8.

In this embodiment, the set value selection means 3a and the control constant selection means 3b are provided inside the controller 1, and the switch 4 of the set value selection means 3a and the switch 4 of the control constant selection means 3a are arranged on the surface of the controller 1, for example. I'm trying to operate it. but,
The set value selection means 3a and the control constant selection means 3b are provided outside the controller 1, and the switch 4 of the set value selection means 3a and the switch 4 of the control constant selection means 3b are operated outside the controller 1. In the illustrated example, 5 setting values 5P
Although selection from I-9P5 and five control constant values DI-PIDS is shown, the number of setting values SP and control constant values PID stored in advance as selection targets is not limited to five.

In the embodiment shown in FIG. 1, not only the set value SP of the controlled variable but also the control constant PID is applied to the arithmetic circuit 6 via the lamp circuit 15, but one or both of the lamp circuits 15 is omitted and the control constant PID is directly set. The value sp and the control constant PID may be applied to the comparator 5 and the arithmetic circuit 6, respectively.

FIG. 2 shows an embodiment in which the second invention of the present application is used to control the temperature of the tunnel furnace 12.
) sea 721, Z2) Z3, three controllers 1a,
lb and lc respectively control the temperature of the corresponding zone Z1.22.23. Each zone Zl-23 has a temperature sensor 13 connected to the input point 2 of the corresponding controller and a temperature control device 1 such as a heater or fan connected to the output point 8 of the corresponding controller.
It has 4.

Each controller 1a-1c has set value selection means 3a and control constant selection means 3b as shown in FIG. They are operated all at once by the system setting switch 11 of the means IO. That is, each operating position of the system setting switch 11 is determined by the setting value selection means 3 of each controller 1a, lb, 1c in the system.
For example, the position 3 selected by the arrow of the system setting switch 11 in FIG. i set meter 1a
, lb, by appropriately connecting the set value selection means of the IC to the set value SP, the set value of 800°C for the controller 1a,
A set value set consisting of a set value of 1000° C. for the controller 1b and a set value of 600° C. for the controller 1c is shown.

This set of set values in the embodiment of FIG.
According to the present invention, each operating position of the system setting switch 11 can be selected at once by selecting the operating position of the system setting switch 11. is connected to the control constant PID on the control constant selection means 3b of each controller 1a, lb, and IC corresponding to the set value set, and represents the set of controlled variables corresponding to the set value set.

For example, the above position 3 is 3! The control constant value PID (8oo) corresponds to the setting value of 800°C of the controller 1a, and the control constant value PIr3 (100°C) corresponds to the setting value of 1000°C of the controller 1b.
0)' Connected to the control constant value PID (8oo) corresponding to the set value of 600°C of the controller 10. In this way, at the same time as a set value set is selected, a set of control constants PID that is optimal for the set value set is selected and set.

Menmitate J Section As explained in detail above, the multiple setting type meter according to the present invention has a means for simultaneously selecting and setting the set value of the control gi quantity and the control constant, so (a) setting By eliminating the need for complicated control constant adjustments when changing values, the set value changing operation is made smoother, and (b) there is a remarkable effect of preventing thermal shock and other problems associated with setting value changes.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the invention, and FIG. 2 is a block diagram of another embodiment of the invention. 1, Ia, Ib, IC...Controller, 2...Input point, 3...Selection means, 3a...Set value selection means, 3b...Control constant selection means, 4...Switch , 5... Comparator, 6... Arithmetic circuit, 7.
... Output circuit, 8. Output point, 10. System setting means, 11. System setting switch, 12. Tunnel furnace, 13. Temperature sensor, 14. Temperature control device, 15...Lamp circuit. Patent applicant: Okura Electric Co., Ltd. Patent application agent: Patent attorney: Nanami Reijibe s2 Figure 10 ME 1 χ Poor means

Claims (3)

[Claims] (1) A controller that has a comparator that compares the set value and measured value of the controlled variable and an arithmetic circuit that processes the output of the comparator, which stores a plurality of predetermined controlled variable set values and a set value selection means for selectively applying an arbitrary set value among the plurality of set values to the comparator; and a set value selection means for storing a plurality of control constants predetermined corresponding to the plurality of set values, and among the plurality of control constants. A multi-setting type controller comprising control constant selection means for applying a control constant corresponding to the selected set value to the arithmetic circuit in synchronization with the set value selection means. (2) In the controller as set forth in claim 1, the controller is connected between the set value selection means and the comparator to convert a rapid change in the set value into a gradual change for the comparison. A multi-setting controller equipped with a lamp circuit that applies voltage to the device. (3) Comparison of each controller in the control system in a control system consisting of a plurality of controllers each having a comparator that compares the set value and measured value of the controlled variable and an arithmetic circuit that performs calculation processing on the output of the comparator. A set value set consisting of set values to be applied simultaneously to the controller, and a control constant to be applied to the arithmetic circuit of each controller in the control system corresponding to the set value to be applied to the comparator of each controller in the control system. storing a plurality of sets of control constants, selectively and simultaneously applying any set among the plurality of set value sets to a comparator of the corresponding controller, and the set of control constants corresponding to the selected set value set; A control system comprising system setting means for applying a value to the arithmetic circuit of a compatible controller.