JPS6220002A - Digital controller - Google Patents

Abstract

PURPOSE:To reduce the number of hardware switches, to simplify the switch operation and to prevent the misoperation by reading a storage card where parameters are stored to set parameters on a controller. CONSTITUTION:The parameter required for the arithmetic processing by which a control signal is obtained from a measured value signal is read from the storage card by a card reader 14 and is applied to the input side of a microcomputer 22. Consequently, switches for parameter setting are not provided. The microcomputer 22 uses the parameter from the card reader 14 to subject the measured value, which is supplied from a measurer through an A/D converter 21, to a required arithmetic processing in accordance with the output of an operation switch 13 and gives the control signal to a D/A converter 23. The output of this converter 23 is applied to a system to be controlled as the control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital control device equipped with a microcomputer, and in particular to a digital control device that reads parameters used for temperature control in heat treatment, feedback control of various processes, etc. from a storage card. Concerning shape-adjustable shapes.

Furthermore, in general, the front panel of a controller is required to be narrow in order to reduce the area occupied by the control panel to which the controller is attached.

On the other hand, the digital adjustable type equipped with a microcomputer, which is frequently used these days, has a wide range of functions.
It is inevitably equipped with many operation/setting switches. When there are a large number of switches and switches, colors and groups are used to clearly distinguish frequently operated switches from less frequently operated switches.

FIG. 2 shows a perspective view of an example of a conventional digital adjustment type. There is a display section 2 on the front panel l. Switch group 3a, 3
b and a control parameter switch 3C.

In this case, the control parameter that is operated infrequently is switch 3.
Parameters that are set by using the combination of switches 3a and 30 and are usually used often are set by using the combination of switches 3a and 3b.

Conventional digital scales of this type have a large number of switches arranged side by side on the front panel, making switch operation complicated and causing erroneous operation.Furthermore, most of the front panel area is occupied by the switches, so the display The disadvantage is that the functions of the device are limited to simple ones.

is trying to do it. Accordingly, the problem to be solved by the present invention is to reduce the number of hardware switches installed in a digital controller equipped with a microcomputer.

The present invention aims to simplify switch operation, prevent erroneous operation, and enhance display functions.

[1, Steps to be taken] Referring to FIGS. 1 and 3, the digital controller according to the present invention has a microcomputer 22, and a card reader 14 is installed in an appropriate part of the digital controller. , for example, is attached to the front panel 1.

Parameters necessary for arithmetic processing to obtain a control signal from a measured value signal are read from the storage card 24 by the card reader 14 and applied to the input side of the microcomputer 22. Therefore, switches for parameter setting are not provided.

Furthermore, the input side of the microcomputer 22 is connected in the illustrated example via an analog-to-digital converter 21 to a measurement value signal source, such as a measuring instrument (not shown). In the illustrated example, the control signal that is the output of the microcomputer 22 is sent to an external circuit such as a controlled system via a digital-to-analog converter 23. When the output of the measuring instrument is a digital signal and the controlled system is controlled by the digital signal, an analog-to-digital converter 2 is used.
1 and the digital-to-analog converter 23 can be omitted. The display 11 may be connected to the microcomputer 22 if necessary.

A preferred embodiment of the storage card 24 used in the present invention is an integrated circuit (Integrated circuit).
IC) storage card, magnetic storage card, or optical storage card.

Examples of parameters stored in the storage card 24 are PID
In the case of control, the parameters include a proportional band, an integral time, a differential time, various control set values, alarm set values, etc., but the parameters used in the present invention are not limited to these examples. Writing of parameters to the storage card 24, modification, and erasure of the parameters are performed by, for example, a card writer 25 shown in FIG. 5.

The operation of the digital type meter according to the present invention will be explained with reference to FIGS. 3 and 4. Using a program stored in advance in a storage means such as a ROM (not shown) built into the microcomputer 22, the digital form factor monitors the insertion status of the storage card 24 as shown in step 51 of FIG. Monitor. When the insertion of the storage card 24 is confirmed, the data on the storage card 24 is read in step 52 in the figure. For example, based on the end mark written on the storage card 24, completion of data reading is determined in step 53.

After data reading is completed, required parameters are set in step 54. When the settings of all required parameters are confirmed, "Ready" is displayed in step 55. If the setting of the required parameters is not completed, the parameter setting process is ended by displaying "Preparation Not Complete" in step 5B, or displaying "Preparation Complete" or "Preparation Not Complete".

Therefore, according to the present invention, various parameters are set by reading the storage card, so hardware switches for parameter setting can be omitted.

In the embodiment shown in FIG. 1, a card reader 14, a measured value display 11.
A parameter display 12) and an operation switch 13 are provided. Referring to FIG. 3, when the measured value is an analog quantity, the measured value is digitized by an analog-to-digital converter 21 and then applied to the microcomputer 22. If the measured values are supplied as digital quantities, the analog-to-digital converter 21 can be omitted.

Using the parameters from the card reader 14, the microcomputer 22 applies necessary arithmetic processing to the measured value according to the output of the operation switch 13, and provides a control signal to the digital-to-analog converter 23. The output of this converter 23 is applied to the controlled system as a control signal.

If the controlled system is controlled by digital signals, the digital-to-analog converter 23 can be omitted.

In the display unit 11 in FIG. 1, the indicator light RDY indicates "control status is good", the indicator light ALM indicates "alarm", the indicator light RUN indicates "in operation", and the indicator light R indicates "remote control".
(Communicating with host computer)" and further shows the temperature of 12 channels as 1,25 in the operating state shown.
Indicates 0°C. Parameter indicator 12 indicates that the parameter setting is 1,200° C. under certain operating conditions. The key PTN in the operation switch 13 indicates a switch for selecting one to be executed from n stored setting values (patterns), and the key DISP indicates a changeover switch for displaying each parameter.

FIG. 5 shows a card writer 25 for writing parameters on a memory card 24 before inserting it into a digital controller. Generally, there is a limit to the size of the operation panel of the card writer 25. So this panel can be a very good man-fist-machine-fist interface. Furthermore, if the card writer 25 is connected to a terminal device such as a personal computer, the operability will be further improved. The illustrated card writing device 25 includes alphanumeric keys 261 and editing keys 27.
, a function key 28, a display 29, and a card insertion section 30.

Information such as predetermined parameters is input to the card writer 25 using the alphanumeric keys 26 and the edit key 27, and the information is written onto the storage card 24 by operating an appropriate function key 28, for example, the key write in the illustrated example. can be memorized.

In the digital controller according to the present invention, information such as parameters is not only written into the controller via the memory card 14, but also the memory card 14 is made writable so that information accessed by the digital controller can be written into the controller. A mechanism for writing the data onto the memory card 14 may be added. The function keys 28 of the card writer 25 in FIG. 5 include a key READ for displaying the information thus stored on the storage card 14 on the display 29.

As explained above, in the digital controller according to the present invention, parameters are stored in advance on a memory card, and parameter settings on the controller are performed by reading the memory card with a card reader. The following effects are achieved: (a) A group of setting switches on the front panel of the controller is no longer required, and complicated switch operations for parameter setting are eliminated, making operation easier.

(b) Controller malfunctions due to incorrect operation of parameter setting switches can be eliminated.

(c) Even if the operating state of the process differs depending on the products being processed, such as when processing a small number of different products, if a memory card with parameters suitable for each product is prepared, the operating state can be changed simply by replacing the memory card. It can be easily and accurately changed and handled easily.

(d) It is possible to improve the sophistication of the controller by making use of the front panel space created by omitting the parameter setting switch.

[Brief explanation of drawings]

FIG. 1 is a front view of a digital controller according to the present invention, FIG. 2 is a perspective view of a conventional controller, FIG. 3 is a block diagram showing the configuration of the present invention, FIG. 4 is a flowchart of the operation, and FIG. The figure is a front view of the card writer. 1...Front panel, 2...Display section, 3a, 3b
, 3c... switch group, 11... measurement value display,
12... Parameter display device, 13... Operation switch, 14... Card reader, 21... Analog-digital converter, 22... Microcomputer, 23... Digital-analog converter,
24...Memory card. 25... Card writer, 26... Alphanumeric keys,
27...Edit key, 2B...Function key, 29
...Display unit, 30...Card insertion section. Patent applicant: Okura Electric Co., Ltd. Patent application agent: Patent attorney: Ichihigashi Reijibe Chiku 1 Zu

Claims (3)

[Claims] (1) A controller that performs predetermined arithmetic processing on a measured value signal and generates a control signal, comprising a card reader that reads parameters in the arithmetic processing from a storage card, and a microcomputer that performs the arithmetic processing using the parameters. A digital controller. (2) In the digital controller according to claim 1, an analog-to-digital converter converts an analog measurement value signal into a digital signal and applies it to the calculation means;
A digital controller comprising: a digital-to-analog converter for converting a digital control signal from the calculation means into an analog control signal; and a card writer for writing the signal from the calculation means onto the storage card. (3) A digital controller according to claim 1 or 2, wherein the storage card is a magnetic storage card, an integrated circuit storage card, or an optical storage card.