JPH046964B2 - - Google Patents

Description

Detailed Description of the Invention The present invention controls a controlled object, such as a controller used for controlling the temperature of a heat treatment furnace, according to a preset control sequence, and displays the control state using a built-in graphic display device. The present invention relates to a control device configured to do so.

As this type of device, for example, JP-A-56-
There are program setting devices shown in No. 111903 and Japanese Unexamined Patent Publication No. 111904/1983. When operating such equipment, it may be necessary to understand the current control state and where the control state is in a preset control sequence (control pattern). .

As a method for achieving this purpose, for example, as disclosed in the above-mentioned published patent application, the step number of the currently executed control sequence and the control parameter selected at that time may be displayed using a light emitting element. It is valid. It is also possible to display a numerical value of the elapsed time from the start of control to the present, and estimate the current control state from the elapsed time and a control sequence diagram (table).

However, with the above method, it is necessary to understand the control sequence itself or prepare a control sequence diagram (table), and also to understand the current control state by correlating it with the control sequence. It takes some time to complete the process, which is inconvenient in an emergency, and furthermore, there is room for improvement as it is easy to misidentify the control status.

Therefore, an object of the present invention is to provide a control device that controls a controlled object according to a preset control sequence and displays the control state on a graphic display device, which displays the control state at the time of operation and before and after the control. It is an object of the present invention to provide a control device that can directly read the information from the graphic display device by associating it with a control sequence, and can eliminate all of the above-mentioned inconveniences.

Such a control device of the present invention associates a control sequence with time and displays it as a two-dimensional figure on the screen of a figure display device, and shows the black-and-white relationship between the part before and the part after the current time of the same figure. It is about reversing it. However, this is a case of black and white display, and generally the relationship between brightness (density) or color between the lines of the displayed figure and the margins is reversed as described above.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a control device according to the present invention.

In the figure, 1 is a microprocessor (MPU). 2 is an input control circuit, through which data input from the keyboard 3 and feedback signals from a controlled object (not shown) are sent to the MPU.
1. 4 is a nonvolatile data memory, and the MPU 1 stores input data from the keyboard 3 (control sequence setting data, etc.) and other data to be saved. Note that the program of the MPU 1 is stored in a fixed memory (not shown). Reference numeral 5 denotes an operation circuit, which outputs a signal for operating the controlled object according to data given from the MPU 1. still,
If the delay time of the controlled object is small, the output signal of the operating circuit 5 or a signal related thereto may be used as the feedback signal. 6 is a graphic display device using a liquid crystal display panel, which will be described later.

An outline of the operation of this control device is as follows.

First, when setting a control sequence, the operator inputs a command to that effect from the keyboard 3.
When this command is input, the MPU 1 starts a control sequence setting program and causes the graphic display device 6 to display input data items and the like. When the operator inputs necessary numerical data from the keyboard 3 according to the displayed contents, the MPU 1 sequentially stores the input data in the data memory 4 while generating a control sequence pattern according to the input data. , and display it on the graphic display device 6.

In this way, the operator sets a desired control sequence while observing the displayed content.

To execute an actual control operation, first, a control sequence is designated from the keyboard 3. MPU
1 reads the data of the designated control sequence from the data memory 4, generates a control sequence pattern, etc. and displays it on the graphic display device 6, and when it is completed, displays on the graphic display device 6 that preparation is complete. After that, when a start command is input from the keyboard 3, the MPU 1 starts the program for control operation, calculates the deviation between the target value at each point determined by the control sequence and the value of the feedback signal, and calculates the deviation between the target value and the value of the feedback signal at each point determined by the control sequence. The operating circuit 5 is controlled so that this occurs.

Thereafter, the control state of the device of the present invention is displayed on the graphic display device 6, which will be explained below.

FIG. 2 is a block diagram of the graphic display device 6.

Reference numeral 11 denotes a known liquid crystal display panel having a built-in driver circuit, and the display screen is arranged in a matrix of M rows and N columns. 12 is a counter driven by a clock supplied from MPU1. Row/column address signals for raster scanning of the liquid crystal display panel 11 are generated by this counter 12 and supplied to the liquid crystal display panel 11 and the control circuit 13. The column address signal is also input to the comparator circuit 14. 15 and 16 are latch circuits connected to the data bus of MPU1, and these latch circuits 1
The contents held in 5 and 16 are the control circuit 13 and comparison circuit 1.
4 respectively. 17 and 18 are random access memories (RAM), and the control circuit 13
read and written by 19 is a fixed memory (ROM) for generating patterns such as characters and symbols.
It is. 20 is an OR circuit, and ROM19 and
The output data (bit parallel) of the RAM 18 is ORed. Reference numeral 21 denotes a parallel/serial conversion circuit (for example, a shift register) that converts the output data of the OR circuit 20 into bit-serial data. The output data of this parallel/serial conversion circuit 21 is input to the liquid crystal display panel 11 as a video signal via, for example, a white/black inversion circuit 22. This white/black inversion circuit 22 is
If the output signal of the comparator circuit 14 is in the off state, the input data "1" (black) is treated as "1" and "0".
(white) is output as is as "0", but when the output signal of the comparator circuit 14 is on, the input data "1" and "0" are inverted to "0" and "1" respectively. and output it.

Note that details of control signals for each part are omitted in the figure.

Next, the display operation will be explained.

Prior to the start of control operations, the MPU 1 transfers control sequence and other pattern data to be displayed on the liquid crystal display panel 11 to the RAM 18, and also transfers data (addresses of the ROM 19) for generating character and symbol patterns to the RAM 17. Write. Writing of these data is performed by the control circuit 13. That is, when the write mode is designated from the MPU 1 via the data bus and the latch circuit 15, the control circuit 13 converts the data transferred from the MPU 1 to the latch circuit 15 into the address data also transferred to the latch circuit 15. Write to the address of RAM 17 or 18 specified by .

When writing of the necessary data to the RAMs 17 and 18 is completed in this manner, the MPU 1 switches the control circuit 13 to the read mode through the latch circuit 15, and also resets the latch circuit 16. When switching to the read mode, the control circuit 13 sequentially accesses the RAMs 17 and 18 while addressing them in accordance with the row/column address signals supplied from the counter 12.
The read data of RAM 17 is given to the address input of ROM 19, and dot pattern data such as characters and symbols are arranged in bit parallel (e.g. 8 bits).
Data is read out from the ROM 19, while dot pattern data such as control sequences and time axes are read out in parallel bits from the RAM 18. These two
The two dot pattern data are logically summed in an OR circuit 20, converted into bit-serial data in a parallel/serial conversion circuit 21, and then transferred to a white/black inversion circuit 22.
It is sent to the liquid crystal display panel 11 via , and displayed. At this point, the latch circuit 16 has been reset, so the output of the comparator circuit 14 is off during the entire scanning period of the liquid crystal display panel 11, and the white/black inversion circuit 22 does not perform black and white inversion.

An example of the screen display on the liquid crystal display panel 11 at this time is shown in FIG. In the figure, A is a pattern of a control sequence, B is a pattern of a time axis in which elapsed time is calibrated, and C is a pattern in which a control amount (for example, temperature) is calibrated. These patterns A, B, C
is displayed in "black" over the entire area, and the margins are displayed in "white". Note that although numbers, letters, and other symbols indicating the scale units of patterns B and C are generally displayed, they are omitted from the drawings to avoid complication.

After starting the actual control operation, the MPU 1 transmits data corresponding to the elapsed time up to the present time, that is, the column address corresponding to the current time on the time axis of the screen, to the latch circuit through the data bus at regular time intervals. Set to 16. During a period in which the column address indicated by the column address signal output from the counter 12 is smaller than the column address set in the latch circuit 16, the output of the comparator circuit 14 is turned on and the white/black inversion circuit 22 White/black inversion is performed.

Therefore, the display on the liquid crystal display panel 11 is as shown in FIG. 4, for example. That is, with the column address position corresponding to the current time as the border, in the area on the left, patterns A and B are displayed in "white" on a black background, and the relationship between black and white is reversed in the area on the right. The boundary position of black and white reversal gradually moves to the right in the figure as time passes.

In this way, the pattern of the entire control sequence is displayed with the black and white relationship reversed between before and after the current state, so the relationship between the current, previous and subsequent control states and the control sequence is obvious at a glance.

FIG. 5 is a diagram showing another example of screen display.

This example is a case where multiple relays, etc. are turned on/off according to a certain control sequence over time, and the pattern indicated by the symbol D indicates the ON period of each relay, etc., and the control is performed using these patterns as a whole. It will show the sequence. B is a time axis pattern similar to the previous example, and E is a pattern of characters etc. that identifies each relay etc. In this example as well, since the black-and-white relationship is inverted and displayed with the column address position corresponding to the current time as the boundary, the relationship between the current and previous and subsequent control states and their control sequences can be directly read.

In this embodiment, the liquid crystal display panel 11 displays a black and white display, but it may also display a figure by changing the brightness and darkness of green, for example. The same is true for . Furthermore, it is also possible to use a display panel that displays figures in two types of colors; in that case, a circuit for reversing the color relationship is provided in place of the white/black inversion circuit 22, and the output of the comparison circuit 14 is It can be controlled by

Although one embodiment has been described so far, the present invention is not limited to the configuration of the same embodiment. For example, as the display element of the graphic display device, other elements capable of displaying graphics, such as a plasma display panel, may be used. The circuit configuration of the graphic display device may also be modified in various ways as necessary. This also applies to the overall configuration of the control device of the present invention.

As described in detail above, the control device according to the present invention has a graphic display device, displays a control sequence as a two-dimensional graphic on the graphic display device, and displays a portion of the graphic before the current time and a portion thereof. Since the black-and-white relationship is reversed in the subsequent parts (the brightness and color relationship is reversed), the operating point and the control status before and after that can be directly read from the display screen in relation to the control sequence, quickly and easily. It becomes possible to grasp the current and previous control status,
In addition, many effects can be obtained, such as reducing the risk of misrecognition.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing one embodiment of the control device of the present invention, FIG. 2 is a detailed block diagram of a graphic display device in the control device, and FIGS. 3 to 5 are display examples of the graphic display device. FIG. 1... Microprocessor (MPU), 6... Graphic display device, 11... Liquid crystal display panel, 12...
Counter, 13... Control circuit, 14... Comparison circuit, 15, 16... Latch circuit, 17, 18...
Random access memory (RAM), 19... fixed memory (ROM), 20... OR circuit, 21...
...Parallel/serial conversion circuit, 22...White/black inversion circuit.

Claims (1)

[Claims] 1. In a control device that controls a controlled object according to a preset control sequence and displays the control state on a graphic display device, the control sequence is associated with elapsed time on the screen of the graphic display device. To display a control state by displaying a two-dimensional figure and reversing the brightness or color relationship between the lines and margins of the same figure between the part before the current time and the part after the current time. A control device characterized by: