JP2003076405A - Control display device, control system, control program and recording medium recording the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data base system capable of easily regenerating an execution record of a ladder program in past. SOLUTION: A data obtained by input and output equipment 6 as a result of the execution of the ladder program is continuously stored in a data base 32 of a programmable display unit 2 per each one scan unit of the ladder program by a data base control unit 31. The data base 32 also stores the ladder program in common with a data of each scanner. The stored data and the stored ladder program are delivered to personal computers 1. In the personal computer 1, a data regenerating unit 11b regenerates an execution record of the ladder program with animation by changing a display condition of the ladder mark such as a contact point and a coil output with a monitoring function of a ladder editor 16b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system capable of accumulating and storing the execution results of a control procedure program developed by a user according to a control system for operating an industrial control device such as a programmable logic controller. The present invention relates to a display device, a control system, a control program, and a recording medium recording the same.

[0002]

2. Description of the Related Art An industrial control device called a programmable logic controller (hereinafter referred to as a PLC) or the like has a hardware portion mainly including a CPU and a memory in order to realize various controls such as sequence control. , And the software part that controls it. The software part is the design of the sequence control flow for operating the PLC according to the control system at the beginning of the design, and its control flow (sequence control program).
To the instruction word, and writing the instruction word to the memory. Generally, this series of operations is called programming.

In such programming, a unique language is used so that a program can be easily created without having specialized knowledge of a computer, and various programming languages which are easy for users to use are successively developed. It became so. Currently, IEC (International Elect
The rotechnical Commission has established a standard programming language (IEC 6 1131-3). It is SFC (Sequential Function Chart), LD (Ladde
r Diagram), IL (Instruction List), FBD (Functio
n Block Diagram) and ST (Structured Text).

As described above, an environment is being prepared so that programs can be developed using various programming languages. For example, the ladder diagram (LD) has been widely used from the past because the ladder circuit can be relatively easily designed by using a relay symbol, and is still the most used programming language. Programming software such as a ladder editor has become widespread as a programming tool used in programming work in such a programming language. Since this software can create a ladder diagram or the like in a form including a ladder symbol in a computer device such as a personal computer, it is possible to easily create and edit a program.

There are also cases where various sequence control programs originally developed by the user for a specific PLC are incorporated into the PLC (written in the memory of the PLC).

The sequence control program created in this way is written in the memory of the PLC in advance, and P
It is executed cyclically in LC. As a result, various mechanical devices and plant devices, which are target systems, operate. To operate such a device as desired, the following procedure is generally adopted.

First, the system developer / designer grasps the operation sequence of each device in the target system, confirms that the sequence control program is correctly reflected, and then incorporates the sequence control program into the PLC. Run the sequence control program and repeat the operation test. If there is a defect in the sequence control program based on this operation test, it is corrected and debugged.

Further, when the line of the target system is remodeled, the above-mentioned work is performed with respect to the sequence control program as well as the remodeling of the device related to the line.

[0009]

In the above work, since the sequence control program is once incorporated in the PLC or the like to test the operation in the actual machine, if there is an error in the sequence control program, the error will be detected. If there is a portion that interferes with the device, the device may break down, and if worse, there is a risk of destruction. In this operation test, the execution state of the program is monitored by the monitoring function of the ladder editor. This monitoring function opens the file of the same program as the program executed by PLC with an editor, and the operation of the program is reflected by changing the display state of contacts and coil output in the displayed ladder diagram. Has become.

However, in such monitoring, since the current state of the program is only monitored, it is difficult to understand what problem is occurring in the target system. Therefore, it is not easy to analyze a problem that occurred in the past in order to prevent the problem from recurring. Therefore, at present,
In order to prevent the recurrence of the problem, it is necessary to repeat the on-site verification work and tests to accumulate the data, which requires a huge number of man-hours, resulting in an inconvenience that the cost is high.

In order to prevent these problems, it is possible to find an error in the program by simulating the sequence control program.

However, at present, a means for simulating a problem occurring in an actual machine has not been realized. For this reason, it is necessary to perform a test on an actual machine in a state where the above-mentioned trouble may occur, which is anxious.

Further, since the work performed by the above procedure is manually performed, there is a possibility that an operation error may occur. However, since the work actually performed is not recorded in the record, it is often difficult to find an operation error that occurred in the past. In addition, there is a possibility that the device may be broken by an unfamiliar operator performing the work in the wrong procedure at the site.

The present invention has been made in view of the above circumstances, and it is possible to easily reproduce past operations by recording the execution history of the sequence control program. , A control program and a recording medium having the control program recorded therein are provided.

[0015]

A control display device of the present invention displays a control state of a device by a control device for controlling the device according to a control procedure program for defining a control procedure for controlling the device, And in a control display device having an operation input function for controlling the control device, or while controlling the device according to a control procedure program for determining a control procedure for controlling the device, displaying the control state, And, in a control display device having an operation input function for controlling the control device, in order to solve the above-mentioned problems, the data obtained from the device by executing the control procedure program is converted into the control procedure. A database that stores the data in association with a program, and the above-mentioned data for the control procedure program It is characterized by comprising a data storage means for continuously storing for each round.

In the above structure, when the control procedure program is executed by the control device or the control display device, the data obtained from the device as the execution result is associated with the control procedure program by the data storage means. It is stored in the database. At this time, the data is continuously accumulated for each cycle of the control procedure program.

As described above, all the data obtained as the execution result of the control procedure program is stored in the database. Therefore, based on the result, the result generated by the operation performed at the time of executing the control procedure program and the control It is possible to verify such problems as the program. In addition, since data is accumulated in the control display device, there is almost no time delay in acquiring data from the device,
There is no missing data. In particular, in a control display device that controls a device, data can be acquired from the device in synchronization with a cycle of execution of the control procedure program, and at the same time, the data can be stored in a database. The chances of spilling are extremely low.

It is preferable that the control display device includes first execution history reproducing means for reproducing the execution history of the control procedure program based on the data stored in the database. As a result, the execution history of the control procedure program is reproduced, so the user
By checking the execution history, it is possible to actually deal with debugging of the control procedure program and verification of operation mistakes.

A control system of the present invention includes any one of the above-mentioned control display devices and a computer device equipped with data acquisition means for acquiring the data accumulated in the data accumulation means.

In this configuration, in the computer device, the data acquisition means acquires the data stored in the data storage means. Therefore, even if the computer device is installed in a place separated from the production site where the control display device is installed, etc., the above data is acquired,
You can use the data.

In the above control system, it is preferable that the computer device includes second execution history reproducing means for reproducing the execution history of the control procedure program based on the data acquired by the data acquiring means. . As a result, the execution history of the control procedure program is reproduced even in the computer device, so that the user does not have to go to the site where the control display device is installed, and the execution history is displayed at the place where the computer device is installed. By checking, it is possible to actually deal with debugging of the control procedure program and verification of operation mistakes.

The control program of the present invention is a control program for operating each of the above control display devices or computer devices, and causes a computer to function as each of the above means. The recording medium of the present invention is a computer-readable recording medium in which the above control program is recorded.

Even if these control programs and recording media are used, the execution history of the control procedure programs can be saved as in the case of the above-mentioned control display devices or control systems.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

The control system according to this embodiment is shown in FIG.
1, a personal computer (hereinafter, referred to as a computer) 1, a plurality of programmable displays (hereinafter, referred to as a display) 2, ... And PLCs 3 ...

The computer 1 and the display device 2 ... Are connected to each other via a common network 4 capable of communicating with a common communication protocol. On the other hand, the display 2 and the PLC 3 are individually connected to each other via a dedicated network 5 capable of communicating with each PLC 3 according to a unique communication protocol. Also, the common network 4
Is connected to the Internet 8 via a router (not shown). A client device 9 is connected to the Internet 8.

The PLC 3 as a control device comprises a CPU / power supply module, an input unit and an output unit. The CPU / power supply module includes a CPU unit including a CPU and a memory, and a power supply unit that supplies electric power to each unit of the PLC 3. The CPU unit performs arithmetic processing of control data given to the output device based on a signal input from the input device via the input unit according to the control system program. The input unit and the output unit are portions having an interface function which are connected to the input device and the output device, respectively, and exchange digital signals or analog signals input / output with these devices with the CPU section. It is like this.

As the above-mentioned input devices constituting the input / output device 6, devices such as sensors (temperature sensors, optical sensors, etc.) and switches (push button switches, limit switches, pressure switches, etc.) are used. An actuator, a relay, a solenoid valve, a display, or the like is used as the above-mentioned output device constituting the input / output device 6. These input devices and output devices are arranged in required parts of various target systems such as a manufacturing line.

The display 2 as a control display device is a CP
U21, memory unit 22, input unit 23, display unit 24, interface unit (I / F in the drawing) 25 to 27, input / output (I / O in the drawing) unit 28, protocol conversion unit 2
9, a data distribution unit 30, a database management unit 31, and a database 32.

As shown in FIG. 2, the memory section 22 has a DR
AM22a, FEPROM (Flash Erasable and Progra
mmable ROM) 22b, SRAM 22c and the like. The DRAM 22a is mainly used for work during arithmetic processing such as display control, and is also used for temporary storage of data exchanged with the PLC 3. SR
The AM 22c logs control data obtained from the PLC 3 and gives control data (recipe data) to the PLC 3.
It is used to memorize. FEPROM22
A rewritable read-only flash memory b serves as a hard disk drive in a general personal computer. Since the flash memory has no moving parts and is strong against shock, it operates stably even in a bad surrounding environment.

The FEPROM 22b shown in FIG.
As shown in, the display control system program, the protocol conversion data, the screen data, the control function program, and the ladder program are provided in respective areas.

The display control system program is a program for realizing the basic functions for performing image display control. Further, the display control system program has a ladder program monitoring function. this is,
When the ladder program is being executed by the PLC 3 or the display unit 2, this is a function of displaying the state on the display unit of the display unit 2. Specifically, this monitoring function reads the program to be executed from the FEPROM 22b and displays it on the screen as a ladder diagram, and when the ladder program is executed, the ladder symbols such as contacts and coil outputs in the ladder diagram are displayed. Display the program execution status by changing the display color.

The screen data is displayed in the drawing editor 16 described later.
It is created by a and downloaded to the FEPROM 22b. This screen data includes a base screen to be displayed on the display unit 24, data of parts as graphic elements, and a processing instruction word W (see FIG. 4) given later to each mark.

The above parts are a touch switch, a lamp,
It is prepared in advance as various imaged basic parts such as various display devices (for example, a numerical display device and a meter display device). In addition, as a part, in order to express a dynamic change such as a switch or a numerical display at an arbitrary position on the screen, a functional unit in which a desired moving image function is set in a rectangular area set at a desired position ( Tag) is also included. On the user screen including such a component, the component moves according to the operation of the input / output device 6, and the operating condition of the input / output device 6 is visualized.

As shown in FIG. 4, the processing instruction word W included in the screen data is created for each event to be executed on the base screen. This processing instruction word W is basically
File number F of the base screen that should execute the display control operation
And an event name T that specifies the operation content to be executed on this base screen, and reference information I consisting of one or more data that is referenced for each execution event, as a set.

The memory in the PLC 3 is set so that the storage location of the word device and the bit device can be specified by designating an address. A word device is set for input / output data for word data such as a numerical value, and a bit device is set for bit data such as an on / off state. With such a setting, it is possible to control the input / output devices 6 ... Or to individually retrieve the information regarding the operating state thereof by only accessing an arbitrary word device or bit device in the PLC 3.

The display 2 reads the necessary information out of the status information indicated by the bit device or the word device into the memory section 22 in a timely manner, while the processing instruction word W described above is read.
Is repeatedly read and the operation of the content specified by the event name T of each processing instruction word W is executed with reference to the state information on the PLC 3 side. As a result, the display operation that changes according to the change in the state of the bit device or the word device is executed.

The control function program is a program for realizing the basic function of sequence control. The ladder program is created by the ladder editor 16b described later and downloaded to the FEPROM 22b. This ladder program is a program that defines a control procedure so that the input / output devices 6 ... Operate in accordance with a desired sequence. The control function program and the ladder program are used when the PLC function of the display device 2 is used.

The protocol conversion data stores conversion data necessary for the protocol conversion processing executed by the protocol conversion unit 29 described later. This data may be in any format as long as the communication protocol can be mutually converted between the dedicated network 5 and the common network 4. However, the FEPROM 22b stores, as protocol conversion data, a data transfer format indicating a format of data transmitted on the dedicated network 5 and a command conversion table indicating a correspondence relationship between command codes transmitted on both networks 4 and 5. is doing.

Specifically, the data transfer format is the data to be actually transmitted, such as the data content to be read / written, the size of the data, and the address to be read / written, in the data string transmitted via the dedicated network 5. This is a skeleton-shaped data string in which the part that changes depending on the content is undefined, and the undefined part defines only the purpose. If the command area is undefined and the data transfer format extracted from the actually transmitted data string is common to multiple commands,
The command area may be undefined and a common data transfer format may be used between these commands.

Further, the command conversion table stores the correspondence between the common code transmitted by the common network 4 and the command code transmitted by the dedicated network 5. The protocol conversion unit 29 described later converts one code into the other code based on the command conversion table.

The CPU 21 has the above-mentioned FEPROM 22b.
According to the display control system program stored in, the operation of each part of the display 2 is controlled for display. Further, the CPU 21 performs various kinds of arithmetic processing necessary for the protocol conversion by the protocol conversion unit 29 and the data distribution processing by the data distribution unit 30.

The CPU 21 has a function of controlling communication with a computer 1 which will be described later through an interface section 25 which will be described later. The CPU 21 has screen data from the drawing editor 16a and a ladder program (user program from the ladder editor 16b). ) When receiving FEPROM
It is stored in 22b or is transferred to the PLC 3 when the above ladder program is received. Further, the CPU 21
It has a function of controlling communication with the PLC 3 via an interface unit 26 described later, and communication with an input / output device 6 via an interface unit 27 and an input / output unit 28 described later.

The input section 23 is composed of an input device such as a touch panel for inputting on the display screen of the display section 24. The touch panel is provided for inputting on the display screen of the display unit 24, and an analog resistance film type touch panel or the like is suitable. Also, the input unit 2
3 includes a touch panel controller that controls the touch panel, and the touch panel controller converts the output voltage of the touch panel into input position information and outputs it to the CPU.

The display unit 24 is composed of a display, a graphic controller, a VRAM and the like. The display is composed of a flat panel display element such as a liquid crystal panel or an EL panel. Graphic controller
This is driver software that draws the image of the screen expanded in the VRAM on the display.

The interface unit 25 is connected to the common network 4 for communicating with the computer 1 and the other display unit 2. Through the communication via the common network 4, the output data of the PLC 3 is transferred from the display 2 to the computer 1 as described later. The interface unit 26 is connected to the dedicated network 5 to perform communication with the PLC 3. Through the communication via the dedicated network 5, the output data from the PLC 3 is transferred to the display device 2 as described later.

On the other hand, the interface unit 27 is a CPU
21 is an interface circuit that mediates the transfer of signals between the I / O unit 21 and the input / output unit 28.
It is equipped with an A converter, an A / D converter and the like. The input / output unit 28 has a large number of input / output terminals, an input / output circuit, a remote I / O communication function, and the like so that the input / output device 6 can be connected.

The display 2 has a PLC function by having the interface section 27 and the input / output unit 28, and is configured to directly control the input / output device 6.

The protocol conversion unit 29 will be described later when the communication protocols in both networks 4.5 differ from each other, as described in International Patent Publication WO99 / 56186 (published on November 4, 1999). FEP
While referring to the protocol conversion data stored in the ROM 22b, one communication protocol is converted to the other communication protocol. In general, the PLC 3 often has a different communication protocol used for data communication for each model (each manufacturer or each product even if they are the same manufacturer). Therefore, in order to communicate between the computer 1 and the different PLC 3, the protocol conversion unit 29 is provided.

The data distribution unit 30 outputs the output data, which is fetched from the input / output device 6 to the memory of the PLC 3 and output from the PLC 3 when the preset distribution condition is satisfied, to the computer 1 or another display device 2. Deliver to specified delivery destination such as. Therefore, the node information regarding the node of the delivery destination and the setting information regarding the delivery are previously downloaded from the computer 1 and stored in the memory unit 22. The setting of delivery conditions will be described later in detail.

The database management section 31 as a data storage means registers the input / output data of the input / output device 6 fetched via the PLC 3 or the input / output unit 28 in the database 32, or those registered in the database 32. Search for data. Further, the database management unit 31 continuously registers the input / output data in the database 32 in the order of occurrence, and at this time, the input / output data is written in the database 32 in synchronization with the operation cycle of the ladder program. .

The database management unit 31 sets a folder to which a name is given for each display device 2 in the database 32 in order to enable the above registration and search, and the screen of the user screen displayed on the display device 2 is set. Data and PLC3
Alternatively, a ladder program executed by the display device 2 (PLC function), a ladder symbol as a changing element in the ladder program, a device address, and the above-mentioned input / output data are combined into a record, which is stored in the above folder. Register records in chronological order. The folder name is the station name of the display device 2, for example, A as shown in FIG.
"Node A (NODE A)" and the display 2
An appropriate name such as the model name of is used. Further, the database management unit 31 searches the computer 1 for a record at a designated time in a folder designated by the user, and causes the computer 1 to display the obtained record via the data distribution unit 30.
Pass to 6b.

For the search, the database management unit 31 as the first execution history reproducing means provides the user with a search screen 51 as shown in FIGS. 5 and 6, for example. This search screen 51 includes a reproduction key 51a, a stop key 51b, a fast forward key 51c, a fast rewind key 51d, and a pause key 51.
e, a date / time setting unit 51f for setting the date and time, and a key designating unit 51g for designating a key to be described later.

The database management unit 31 uses the reproduction key 51.
By operating a, the display device 2 (display control system program), the drawing editor 16a or the ladder editor 16b
The data is continuously searched so that the search data is displayed as a moving image. When the fast-forward key 51c or the fast-reverse key 51d is operated in this search, the search speed is increased and the search screen is displayed at high speed in the forward or reverse direction, while the search is temporarily stopped by operating the pause key 51e. However, at this time, the user screen is displayed in a stationary state.
Further, by operating only the fast-forward key 51c or the fast-return key 51d, the search position changes at high speed, but the user screen is not displayed (reproduced). At this time, the date and time setting unit 51f
, The date and time recognized when the search position is moved is displayed. Further, the search is stopped by operating the stop key 51b.

The above search screen 51 is displayed on the playback screen 52 which is searched and displayed by the monitoring function of the drawing editor 16a or the ladder editor 16b.
It is possible to move to a desired position by dragging and dropping with a mouse. With such a search screen 51, the user is provided with an environment in which a search is performed in the same manner as when operating an audio device or the like.

Since the display device 2 is often installed in a place where the environment for mechanical devices is bad, such as in a production site, it is not preferable to provide a hard disk having a movable portion as a storage device. Therefore, the database 32
Are built on a semiconductor memory. At present, the semiconductor memory does not have a capacity capable of storing a large amount of data like a hard disk, and therefore it is preferable that the semiconductor memory is a flash memory memory card that can be detachably attached to the display 2. In the database 32, the first, second, third, ...
Data (records) obtained by the n-th scan are sequentially written in scan units.

The database 32 manages the data sequentially written by the database management unit 31 for each folder. For example, regarding the PLC 3 connected to the display device 2 of the node A or the ladder program executed by the PLC function of the display device 2, as shown in FIG. 7, “date and time”, “ladder”, “ON”, “ "Production number", "ON / O
Items such as “FF”, “count value”, and “lighting / extinguishing” are provided as fields. Although the “date and time” is described in the unit of minutes in the figure, it may be possible to store the unit of seconds and milliseconds as needed.
“Ladder” represents the file name of the ladder program. "ON" means that the production line start button is ON
It means that it was done (it becomes "1" when it is ON).
“Production number” represents a set value of the number of products that pass a predetermined position on the line. “ON / OFF” represents the output of the optical sensor that detects the passage of the product at the above-mentioned predetermined position, and detection or ON is “1”, and non-detection or OFF is “0”. "Count value" represents the count value of the ON output counter of the optical sensor. “Lighting / extinguishing” indicates whether or not the set number of products is conveyed by the line by lighting or extinguishing the lamp. The light is “1” during transportation, that is, the light is off during transportation It is "0".

Although not shown, the data of each field except "ladder" are written together so that the device address and the data of the ladder symbol on the ladder program form a pair. For example, in the case of "ON / OFF", it is the device address of the start button and the ladder symbol of the a contact (normally open contact), or "lights on / off".
In the case of, it may be the device address of the lamp and the ladder symbol of the coil output. One record is formed by those fields, and each record is written in chronological order.

In the database 32, a sequential file structure in which records are stored in the order of input is formed. This makes it possible to access records in order of time. Further, in the database 32, a desired record is stored with a key assigned by the database management unit 31 so that the record can be directly accessed based on the designated search item. Although not shown, the key setting is performed by the user in advance on a key setting screen provided by the database management unit 31.

The key is attached to data (search item) such as time and alarm. Since the final access to the record is performed based on the physical address, it is necessary to associate the physical address with the key. As this association, for example, the key and the physical address are associated on a one-to-one basis in the comparison table, or a record is written with the value obtained by using a predetermined function based on the key value as the physical address. It can be mentioned. Further, instead of associating the key with the physical address, the record number is calculated from the key, the record is written based on this record number, and the OS file system is made to calculate the physical address from the record number. May be.

As described above, by adding the key to the record, the desired record can be uniquely specified by the key.

The protocol conversion unit 29, the data distribution unit 30, and the database management unit 31 are software that can be provided in the form of program media as packaged software, and have been downloaded from the computer 1 to the display unit 2 in advance. Further, this software may be pre-installed on the display unit 2 when the display unit 2 is shipped, etc., if necessary.

Here, the program medium is a recording medium which is separable from the computer 1 and the display unit 2, and is a tape system such as a magnetic tape or a cassette tape, a magnetic disk system such as a floppy disk or a hard disk, Optical disk systems for optical disks such as CD-ROM, MO, MD, DVD, IC cards (including memory cards), card systems such as optical cards, or mask RO
It may be a medium that fixedly holds the program, including a semiconductor memory such as M, EPROM, EEPROM, or flash ROM.

Further, since the present control system has a system configuration that can be connected to a communication network including the Internet 8, it may be a medium that carries the program fluidly so as to download the program from the communication network. However, when the program is downloaded from the communication network in this manner, the download program may be stored in the computer 1 in advance or installed from another recording medium.

Computer 1 as computer device
Is the same as a general purpose personal computer.
It has a U, a memory (RAM, ROM, etc.), an external storage device (hard disk drive, MO drive, etc.), a display device, and an input device (keyboard, mouse, etc.). In addition, as shown in FIG. 1, the computer 1 includes a server unit 11, an interface unit (I / F in the figure) 12,
The distribution setting unit 13, the network file 14, the data registration unit 15, the editor unit 16, the data memory 17, the compiler 18, and the public server unit 19 are provided.

The interface section 12 is connected to the common network 4 for communicating with the display 2.

The server section 11 includes a data communication processing section 11a.
And a data reproducing section 11b. The server unit 11 is software that can be provided in the form of program media as packaged software, and is installed in the computer 1 in advance. This program medium is also a recording medium which is separable from the computer 1 and the display device 2 like the above-mentioned program medium.

The server unit 11 also performs a security check for access from the outside via the common network 4. For example, in the common network 4, when it is confirmed that the user ID and the password are registered, the access is permitted (authenticated). This makes it possible to reject inadvertent access by a third party from the Internet 8 connected to the common network 4.

The data communication processing section 11a as a data acquisition means is a section for performing data communication processing with the display unit 2 via the common network 4 and exchanging data with the editor section 16. is there. The data communication processing unit 11a transfers, for example, a ladder program as a user program created by a ladder editor 16b described later to the display device 2. Further, the data communication processing unit 11a outputs the ladder program distributed from the display device 2 and the input data (control instruction data) and the output of the input / output device 6 in response to a request from the data reproducing unit 11b or another application program. Perform processing such as collecting data.

This input data is the contents (bit, bit) of the device address, which will be described later, in the input device of the input / output device 6.
The output data is the content to be output of the device address in the output device of the input / output device 6.

The data reproducing section 11b as the second execution history reproducing means performs processing for causing the editor section 16 to reproduce the record read by the database managing section 31 described above. Therefore, like the database management unit 31, the data reproducing unit 11b provides the user with the above-described search screen 51, superimposes the ladder program reproduced by the editor unit 16 on the search screen 51, and the data of the computer 1 is displayed. Display on the display.

The distribution setting unit 13 sets node information and distribution information. The node information includes a node in the common network 4 and the type of the display device 2 connected to the node. The distribution information includes the name of the device (input / output device 6) connected to each PLC 3, the data distribution timing for each display 2, the store address of the data to be distributed, the store address of the received data, and the like.
The node information and the distribution information are stored in the network file 14 and downloaded to the data distribution unit 30 of each display device 2 as needed. This delivery setting section 1
3 is software that can be provided in the form of a program medium as packaged software, and is installed in the computer 1 in advance. This program medium is also a recording medium which is separable from the computer 1 and the display device 2 like the above-mentioned program medium.

The data registration unit 15 has the FEPROM 22b.
The above-mentioned protocol conversion data to be stored in is registered in advance. The protocol conversion data is downloaded to the required display unit 2 via the data communication processing unit 11a at the time of initial setting or maintenance such as when the PLC 3 connected to the control system is changed.

The editor section 16 includes a drawing editor 16a and a ladder editor 16b.

In the drawing editor 16a, the programmable display 2 is provided with various monitors for management such as the operating status of the input / output device 6 and work instructions, and a function as a terminal for inputting set values for the device. Screen creation software for creating a user screen to be displayed on the display unit 24.

Generally, the drawing editor 16a includes a switch, a lamp, a ten-key pad, various indicators (for example, a numerical indicator, a meter indicator and a graph indicator) so that a user's screen which is a user's own screen can be created. It has parts, tag setting function, drawing function, and text input function. As the parts, not only a single part having a single function but also a composite part having a plurality of functions such as a composite switch, a counter, and a timer are prepared. Similar to a single component, such a composite component is registered in a library format so that it can be arranged at a desired position on the base screen by an operation such as drag and drop.

Further, the drawing editor 16a assigns the above-mentioned input / output numbers (device addresses) to the respective input / output devices 6 of the parts arranged on the created user screen via variables.

The user screen created by the drawing editor 16a is displayed on the interface unit 1 if necessary.
2 to the programmable display device 2 via the FEP
It is downloaded to the ROM 22b.

The ladder editor 16b controls the PLC 3 so that the input / output device 6 operates according to a desired sequence.
Is a programming software for creating a ladder program that defines the control procedure of the computer 1 so that a ladder diagram corresponding to the operation of the input / output device 6 can be arranged on the display (not shown) of the computer 1 to create a ladder diagram. It is configured. In the ladder editor 16b, for example, the above-mentioned programming language based on the international standard IEC is used.

The ladder editor 16b is a PLC3
The input number and the output number given to each of the input terminal and the output terminal and the name (device name) of the input / output device 6 connected to each input / output terminal are associated with each other through a variable. Allocation (I / O assignment). The result of this allocation is stored in a storage device (not shown) in the computer 1.

When allocation is performed, a device name corresponding to each address is stored in a predetermined memory in the computer 1 with an input number and an output number as addresses. Conventionally, such allocation differs depending on the PLC manufacturer and is set by an absolute address, so it is necessary to prepare a memory table according to the manufacturer. However, this ladder editor 16b compliant with IEC
Since the user can determine the input / output by the above variables (free variables), the above memory table is unnecessary. Further, the allocation once determined can be changed later.

The ladder program created by the ladder editor 16b is downloaded to the FEPROM 22b of the display 2 and also transferred to the PLC 3 via the display 2 (or directly) and downloaded to the memory in the PLC 3.

The data memory 17 is a memory for temporarily storing the ladder program and its ladder symbol searched by the database management unit 31, and the input / output data (device address data) of the PLC 3.
The data stored in the data memory 17 is used for reproduction by the data reproduction unit 11b and processing of the compiler 18.

The compiler 18 as the conversion means converts the reproduction history of the ladder program into a Java (registered trademark) language applet that can be executed by the virtual machine included in the browser 91 of the client device 9. Since this applet is in the Java language, it does not depend on the platform of the client device 9. Each instance in the applet is set to reference the same device address as the corresponding ladder symbol in the ladder program. Further, each instance is created so that the input / output data of the device address is reflected in the ladder symbol.

The computer 1 stores in advance a class including a method executed by the virtual machine for each type of ladder symbol used in the ladder editor 16b, and the compiler 18 stores a method corresponding to each ladder symbol in the ladder program. Generate code to call. The compiler 18 also converts the search screen 51 shown in FIGS. 5 and 6 into an applet as with the ladder program. A class including a method executed by the virtual machine is prepared for each of the above-described search operations on the search screen 51.

The public server section 19 includes the client device 9
For example, URI (Universal Resource I
The ladder program requested by the client device 9 is discriminated based on, for example,
teway Interface) or BGI (Binary Gateway Interface) to instruct the compiler 18 to generate an applet. The public server unit 19 as a communication unit sends the above applet from the interface unit 12 to the client device 9 via the common network 4 and the Internet 8. By including the public server unit 19, the computer 1 functions as a Web server on the Internet 8.

The above-described compiler 18 and public server unit 19 are also software that can be provided in the form of program media as packaged software, and are installed in the computer 1 in advance. This program medium is also a recording medium which is separable from the computer 1 and the display device 2 like the above-mentioned program medium.

The client device 9 as the terminal device
For example, the HTTP (Hyper Text Transfer Protocol) protocol can be used to transfer HTML data from a server device such as the computer
A browser 91 is provided for receiving and browsing documents such as documents. The browser 91 is composed of general-purpose browsing software and the like, and includes a virtual machine. The virtual machine translates the platform-independent bytecode into the native code of the client device 9. This virtual machine executes a drawing method for displaying the ladder program in a state in which the execution history is reflected, according to the input / output data from the computer 1. Further, the virtual machine may be provided independently of the browser 91.

Here, the distribution information set by the distribution setting unit 13 will be described. The distribution information is shown in FIG.
Settings are made on the setting screens shown in (b) and (b), and “distribution conditions” and “distribution station / reception station” are provided on the setting screen.

In the "delivery condition" shown in FIG. 8A, the conditions for determining the delivery timing include power-on, time designation, cycle designation, rewrite trigger, ON period, OFF period, rising trigger and falling trigger. Is provided.

"Power-on" is a condition for delivering when the power of the display 2 is turned on, and "time designation" is a condition for delivering at a designated time. "Period designation" is a condition to deliver every desired period, and "rewrite trigger" is
It is a condition for delivery when the output data is rewritten, that is, when the output data changes. "ON period"
And "OFF period" are conditions for continuing the distribution in each of the ON period and the OFF period of the device, and the "rising trigger" and the "falling trigger" are output data (designated device output). It is a condition for delivering at the time of detecting each of the rising edge and the falling edge of.

Further, in the lower area of the distribution condition setting screen, there is provided a field for inputting the name of the device to be designated with respect to the condition based on the output of the device among the above conditions. Further, below that, there are provided a period (ms unit) for checking distribution conditions, a setting field for a distribution period, and a setting field for processing for returning device output to OFF or ON after distribution. . However, the check cycle is valid only for the distribution conditions of "power-on", "time setting", and "cycle designation", and the limited period is valid only for the distribution condition of "cycle designation". Further, the setting for returning the device output to OFF after distribution is effective only in the distribution condition of "rising trigger", and if this column is not checked, the device output remains ON even after distribution. On the other hand, the setting for returning the device output to ON after distribution is effective only for the distribution condition of "falling trigger", and if this column is not checked, the device output remains OFF after distribution.

On the other hand, the "distribution station / reception station" shown in FIG. 8B is provided with an information entry section for the distribution station and the reception station. The information of the delivery station includes the name of the device that is the output source of the output data delivered from the display device 2 and the number of data delivered in the designated period. In addition, the information of the receiving station includes the name of the device connected to the PLC 3 corresponding to the display device 2 serving as the receiving station or the device directly connected to the display device 2. However, when the database management unit 31 of the display device 2 serves as a transmitting station, the folder name managed by the database 32 is used as the device name. When the computer 1 serves as the receiving station, the name “D MEMORY” of the data memory 17 is used as the device name.

Next, in the control system described above, the accumulation of data in the database 32 and the retrieval of the data performed by each display 2 will be described.

For example, in the display unit 2 of the node A, P
The input data (contents of the device address of the input device) and the output data (contents of the device address of the output device) of the LC3 or the input / output unit 28 are sequentially stored in the database 32 each time one scan (one cycle) of the ladder program is completed. To be done. At this time, the data input at the same time in the folder of the node A (folder name “NODE A”) is treated as one record, and the records input one after another are sequentially written in the database 32. Since such writing is performed automatically, the user can accumulate data without being aware of the database 32. The accumulated records are stored in the data communication processing unit 1.
In response to a request from the data reproducing unit 11b via 1a,
The data is distributed to the computer 1 via the common network 4, and is then temporarily stored in the data memory 17 via the interface unit 12 and the server unit 11.

In the communication between the display unit 2 and the computer 1, the record is delivered from the designated display unit 2 to the computer 1 when a preset delivery condition is satisfied. For example, if the delivery condition is set to “designate a cycle”, records are automatically delivered every cycle.

When performing a search in the database 32, first, the operation mode of the server unit 11 is switched to the search mode, and the database management unit 31 displays a search screen 51 as shown in FIG. Here, when searching for records in order of stored date and time, the search is started in the folder specified by operating the reproduction key 51a.

When the search is being performed, the records requested by the data reproducing unit 11b are sequentially read from the database 32 by the database management unit 31 by the user operating the search screen 51, and the records are read from the data distribution unit 30. Delivered to computer 1 and as above,
It is taken into the data memory 17. The record stored in the data memory 17 is read by the data reproducing unit 11b and output to the ladder editor 16b. The ladder editor 16b reproduces the execution history on the ladder program based on the ladder program in the received record and the data of the device address and the ladder symbol, and the computer 1 displays the reproduction screen 52 of FIG.
Display on the display. When playing the ladder program monitor, the ladder program is played within the area range of the selected ladder program monitor. Then, the operation of the contact or coil searched for in the ladder program changes in accordance with the input / output data in the record, and is expressed by, for example, changing the color of those parts.

Since such a series of operations are continuously performed, the PLC 3 or the P of the display 2 is displayed on the display.
The execution history of the ladder program when the LC function is actually operating can be dynamically reproduced. The ladder program is executed at a speed of several tens of milliseconds per scan, but in the reproduction as described above, the execution state of the ladder program is reproduced for each scan at a speed that can be recognized by a person.

When reading only the record corresponding to the designated key based on the preset key,
For example, by designating "lighting / lighting out" of the lamp as a key and operating the reproduction key 51a, the records of the ladder program at the time of lighting / lighting out are sequentially read and reproduced by the ladder editor 16b. In this way, by designating “lighting / lighting off” as a key, not only the ladder program at the time of lighting / lighting out is displayed, but also the ladder programs before and after the lighting / lighting out are reproduced, so that the display 2 In, it is possible to confirm how the ladder program was operating when the light was turned on / off. Further, in the ladder program including the operator's operation, it is possible to confirm how the operation has affected the execution of the ladder program.

To reproduce the execution of the ladder program,
The time chart displayed on the reproduction screen 53 shown in FIG. 6 is also possible. This time chart is mainly suitable for confirming the ON / OFF state of the device. For example,
On the playback screen 53, the state of "input" changes to "1" when the switch as the input device is turned on, while the state of "output" becomes "1" when the lamp as the output device is turned on. The changed appearance is reproduced. Further, in this time chart, "time" is also displayed based on the time data. Further, the time chart is reproduced by moving the key on the search screen 51 so as to move in the time axis direction.

Reproduction of such a time chart is performed by the ladder editor 16b. Ladder editor 1
6b generates a time chart by converting bit data (“0” or “1”) of the device into a time axis based on the time data.

The search and reproduction operations as described above can also be performed on the display device 2. In this case, the database management unit 31 is caused to display the above-described search screen 51 in the search mode using the monitoring function of the display control system program. At this time, when the user operates the search screen 51, the database management unit 31 accordingly responds to the database 32.
The records are sequentially read from the display, and the ladder program is displayed from the records on the display unit 24 by the monitoring function.
Is displayed in. Also, with this monitoring function,
As with the ladder editor 16b, the time chart of FIG. 6 can be generated.

Unlike the search and reproduction in the computer 1 as described above, the search and reproduction in the display 2 does not require the transmission of records by the common network 4. Therefore, there is no delay due to such communication, and the reproduction process can be performed in almost real time.

The search and reproduction operations described above can also be performed from the client device 9 via the Internet 8. Next, the operation in this case will be described.

First, upon receiving a search request from the client device 9, the public server section 19 activates the CGI and instructs the data reproducing section 11b of the server section 11 to perform the search. In response to this instruction, the data reproduction unit 11b requests the database management unit 31 to search as described above. The database management unit 31 accordingly responds to the database 3
Search for 2. As a result, the record sent from the database management unit 31 is temporarily stored in the data memory 17 and then output to the compiler 18.

Further, the public server unit 19 uses the CGI and BG.
I or the like instructs the compiler 18 to generate an applet. When the compiler 18 receives an applet generation instruction from the public server unit 19, the compiler 18 extracts the ladder symbol in the ladder program from the record corresponding to the applet to be generated, which is read from the data memory 17, and the type of the ladder symbol. The character string (code) for generating an instance of the class corresponding to and the character string (code) for setting the parameter of the ladder symbol in the field of the instance are output. Alternatively, both character strings may be designated and output collectively as an initial value at the time of instance generation.

Furthermore, the compiler 18, when the output of the character strings for all the ladder symbols in the ladder program is completed, the compiler 18 uses the HTML (HyperText Markup Language).
ge) Character strings required for documents (“<HTML>”,
"<TITLE>" etc.) is also a character string to operate the generated code as an applet ("<APPLET> etc.)
Is added before and after the code generated based on each ladder symbol.

In this way, the ladder program stored in the database 32 and actually executed by the PLC 3 or the display unit 2 (PLC function) is output to the public server unit 19 as an applet. Public server section 19
Sends the above applet from the interface unit 12 to the client device 9 via the common network 4 and the Internet 8.

In the client device 9, the browser 91 activates the virtual machine and executes the drawing method using the device address and the input / output data provided from the computer 1 to reflect the execution history of the ladder program. Is displayed. In this way, the client device 9 located at a position distant from the computer 1 can perform the search similarly to the computer 1.

As described above, in the control system of the present embodiment, since the display device 2 includes the database management section 31 and the database 32, all the input / output data obtained via the PLC 3 or the input / output unit 28 can be obtained. The data is sequentially stored in the database 32 by the database management unit 31. Thereby, the data can be efficiently collected and accumulated. Therefore, the database 32 can be constructed without the user's awareness.

Since the data is accumulated in the database 32 in time series in the order of collection, the database 3
The data structure in 2 is simplified and the details and location of the data are easy to understand. This facilitates database management.

Further, since the display device 2 collects data, the communication time can be shortened. In particular, display 2
In the case of collecting the input / output data via the input / output unit 28 using the PLC function of, the communication by the dedicated network 5 is unnecessary and the speed is higher than that in the case of collecting the input / output data via the PLC 3. I / O data can be collected.

On the other hand, when a database replacing the database 32 is built in the computer 1, the display 2
The above-mentioned record including the input / output data collected in step 1 is distributed by the data distribution part 30 and accumulated in the database of the computer 1. However, in this case, since the record is distributed via the common network 4 to which the plurality of display devices 2 and other devices are connected, depending on the communication status of the network 4, the data collection speed (PLC3 Scan time) and records may not be stored in the database. For example, when 10 displays 2 are connected to the common network 4, when records from each display 2 are stored in the database, the records from each display 2 are stored only at intervals of about 1 second. I can't.

As a result, if there is a record that cannot be stored, the ladder program may not be played back. For example, in the case where the sensor output gives a start trigger for one scan, when the sensor (input device) causes chattering, if the ON data cannot be taken into the database at the timing when the sensor is correctly turned on, Even if the data of is imported to the database, the scan will not start when the ladder program is played back.

On the other hand, by accumulating the input / output data in the database 32 of the display 2 as in the present embodiment, the data can be collected at high speed as described above. Data can be accumulated reliably. This makes it possible to avoid the inconvenience that the ladder program cannot be reproduced as described above.

Further, by reflecting the input / output data obtained by the search in the ladder program, the operation on the display 2 and the operation of the device in the target system are reproduced. Therefore, it is not necessary to store a huge amount of data as in a VTR that records a moving image, and a ladder program when an operation error occurs can be confirmed by searching. Moreover, if a continuous search is performed by using the search screen 51 as shown in FIGS. 5 and 6, the change due to the input / output data of the ladder symbol of the ladder program is dynamically displayed. The execution history of the ladder program can be played back in the same manner as a playback operation on the playback device.

As described above, reproducing the execution history of the ladder program can be used not only for verification of operation mistakes but also for education of operators. For example,
Since the operation content of the display device 2 can be repeatedly reproduced without operating the target system, the operation content by a skilled operator can be sufficiently used as a teaching material.

When performing the same work as yesterday's work,
Since it is possible to confirm whether there is any inconvenience by using the yesterday's data stored in the database 32 by reproducing the execution history of the ladder program, it is possible to effectively reuse the data.

In this control system, the display devices 2 ... Are connected to both the common network 4 and the dedicated network 5. Further, the display device 2 has both networks 4.5.
If the communication protocol is different from each other, the respective communication protocols are mutually converted and the PLC3 connected to itself is
It relays communication with the computer 1 or another display device 2. As a result, even if the communication protocols adopted by the PLCs 3 connected to the display devices 2 are different from each other, the display devices 2 and the computer 1 can communicate with each other by the common communication protocol.

In addition, the display 2 has the PLC function,
When accessing the input / output device 6 via the input / output unit 28, the above protocol conversion is not necessary, and the communication speed can be further increased.

In this embodiment, TCP / I on Ethernet (registered trademark) is used as the common network 4.
Although P is adopted, it is not limited to this. For example, it may be another network such as IEEE1394. The computer 1 displays each PLC 3 via the display 2.
A similar effect can be obtained if the network has a sufficient communication capacity to communicate with.

Further, in the present embodiment, an example using the ladder program is shown, but the control procedure program of the present invention is not limited to the ladder program, but the above-mentioned IE.
Needless to say, the present invention is also applied to control procedure programs in other languages including the five languages defined by C 61131-3.

Further, in the present embodiment, the computer 1
The example of converting the ladder program as the user program into the applet has been described above, but the present invention is not limited to this. For example, create a bitmap file or JPEG file with the same contents as the user program,
It may be transmitted to the client device 9. When the computer 1 changes the retrieved user program into a format that can be displayed by the client device 9, and then transmits it to the client device 9, a display control program for displaying the user program is previously stored in the client device 9
Installation time, time, and cost can be saved because there is no need to install it in the.

However, when the communication speed between the computer 1 and the client device 9 is low, such as when the computer 1 and the client device 9 are communicating via the Internet 8, when the user program is transmitted, the display update speed in the client device 9 decreases. Resulting in. Therefore, in the present embodiment, an applet that causes the client device 9 to perform a display operation is distributed and the content of the device address is relayed, so that the data transmission amount can be significantly reduced and the response speed in the client device 9 can be reduced. Can be greatly improved.
Further, for example, a user interface such as cursor movement can be processed on the client device 9 side, so that the response speed can be further improved.

Further, in the present embodiment, the case of transmitting an applet is illustrated, but instead of the applet, a programming language such as BASIC is compiled, and the same operation as the applet is executed in the client device 9. The same effect can be obtained by distributing the program.

On the other hand, as in the present embodiment, the computer 1 transmits the applet and the client device 9
When the virtual machine in the server interprets and displays the applet, the operating system (O
Even if the machine language that can be executed by S) or the CPU is different, the applet can be executed. Therefore, the user program can be displayed on more client devices 9 without increasing the types of applets generated by the computer 1.

[0128]

As described above, the control display device of the present invention displays the control state of the device by the control device for controlling the device according to the control procedure program for defining the control procedure for controlling the device. In addition, in the control display device having an operation input function for controlling the control device, or in accordance with a control procedure program for defining a control procedure for controlling the device, the device is controlled and the control status is displayed. In the control display device having an operation input function for controlling the control device, a database that stores the data obtained from the device by executing the control procedure program in association with the control procedure program. And the data that continuously accumulates the above data for each cycle of the control procedure program. It is configured to have a data storage means.

As a result, all the data obtained as the execution result of the control procedure program is saved in the database. You can verify program defects. In addition, since data is accumulated in the control display device, there is almost no time delay in acquiring data from the device,
There is no missing data. Particularly, in the control display device for controlling the device, the data can be accumulated in the database almost at the same time as the acquisition of the data from the device, and therefore the possibility of missing the data is extremely low.
Therefore, the control procedure program can be debugged and operation mistakes can be verified easily and reliably.

The control display device is provided with the first execution history reproducing means for reproducing the execution history of the control procedure program on the basis of the data stored in the database. Since the execution history is reproduced, the user can actually deal with debugging of the control procedure program and verification of operation mistakes by checking the execution history. Therefore, it is possible to effectively develop the control procedure program and operate the system.

The control system of the present invention includes any one of the above-mentioned control display devices and a computer device having a data acquisition means for acquiring the data stored in the data storage means.

As a result, even when the computer device is installed in a place separated from the production site where the control display device is installed, the above data can be acquired and used. Therefore, it is possible to effectively use the accumulated data.

In the above control system, the computer device includes the second execution history reproducing means for reproducing the execution history of the control procedure program based on the data acquired by the data acquiring means. The computer device also reproduces the execution history of the control procedure program. Therefore, the user does not have to go to the site where the control display device is installed, and at the place where the computer device is installed, the user can check the execution history to debug the control procedure program or verify operation mistakes. Can actually be dealt with. The effect that the development of the control procedure program and the system operation can be performed more efficiently is achieved.

The control program of the present invention causes a computer to realize each means in each of the above-mentioned control display devices or computer devices. The recording medium of the present invention is a computer-readable recording medium in which the above control program is recorded.

Even if these control programs and recording media are used, the execution history of the control procedure programs can be saved as in the case of the above-mentioned control display devices or control systems. Therefore, the control procedure program can be debugged and operation mistakes can be verified easily and reliably.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a control system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a memory unit of a programmable display in the display / control system.

FIG. 3 is an explanatory diagram showing a program configuration stored in an FEPROM in the memory section.

FIG. 4 is an explanatory diagram showing a basic format of an instruction processing word included in screen data of a user screen displayed on the programmable display.

FIG. 5 is an explanatory diagram showing an operation screen for searching a database provided on the programmable display and a state in which an execution history of the ladder program is reproduced on the ladder program by the search.

FIG. 6 is an explanatory diagram showing another operation screen for searching the database provided in the programmable display and a state in which the execution history of the ladder program is reproduced as a time chart by the search.

FIG. 7 is an explanatory diagram showing a storage format of records regarding a ladder program stored in the database.

8A and 8B are explanatory diagrams showing a distribution condition setting screen and a distribution station / reception station setting screen set by a distribution setting unit in the personal computer, respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Personal computer (computer device) 2 Programmable display device (display device for control) 3 PLC (control device) 6 Input / output device (device) 11 Server unit 11a Data communication processing unit (data acquisition means) 11b Data reproducing unit (second) Execution history reproduction means) 31 Database management unit (data storage means, first
Execution history reproduction means) 32 database

Continued front page    (72) Inventor Masao Saito             8-2-52 Nanko East, Suminoe-ku, Osaka City, Osaka Prefecture             Digital Inc. (72) Inventor Masayuki Sakamoto             8-2-52 Nanko East, Suminoe-ku, Osaka City, Osaka Prefecture             Digital Inc. F term (reference) 5B069 AA11 BA01 BA04 BB16 BC03                       CA01 LA12                 5H220 BB09 CC03 CX06 DD04 HH01                       JJ12 JJ14 JJ15 JJ53 JJ59                       KK04 MM03 MM07                 5H223 CC03 CC08 DD03 DD09 EE01                       EE08

Claims (8)

[Claims] According to a control procedure program for defining a control procedure for controlling a device, a control state of the device by a control apparatus for controlling the device is displayed, and an operation input function for controlling the control apparatus is provided. In the control display device having, a database for accumulating data obtained from the device by executing the control procedure program in association with the control procedure program, and storing the data in each cycle of the control procedure program. And a data storage unit that stores the data. 2. A control device for controlling the device according to a control procedure program for defining a control procedure for controlling the device, displaying the control status of the device, and having an operation input function for controlling the control device. In the display device, a database that stores the data obtained from the device by the execution of the control procedure program in association with the control procedure program, and the data is continuously stored for each cycle of the control procedure program. A display device for control, comprising: 3. The control according to claim 1, further comprising a first execution history reproducing means for reproducing an execution history of the control procedure program based on the data accumulated in the database. Display device. 4. A display device for control according to any one of claims 1 to 3, and a computer device comprising a data acquisition means for acquiring the data accumulated in the data accumulation means. Control system characterized by. 5. The computer device comprises second execution history reproducing means for reproducing the execution history of the control procedure program based on the data acquired by the data acquiring means. The control system described in. 6. A control program for operating the control display device according to claim 1.
A control program for causing a computer to function as each of the above means. 7. A control program for operating the computer device according to claim 4 or 5, wherein the control program causes a computer to function as each of the above means. 8. A computer-readable recording medium in which the control program according to claim 6 or 7 is recorded.