JP2734187B2 - Display screen creation method for multiple PC control device, sequence program creation device, and control status display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display screen creation method for a plurality of PC controllers, a sequence program creation device, and a control status display device, and more particularly to creation of a screen format.

[Prior Art] With the automation of production lines, equipment for operating a plurality of machine tools in an integrated and parallel manner has come to be used. As such equipment, a transfer machine is known.

FIG. 6 shows an example configuration of a transfer machine.

The transfer machine shown in this figure has a plurality of (n in the figure) stations 10-1, 10-2,.
-N. Each station 10 is a single machine tool and has a central transfer bar 12.
And left and right units 14-L and 14-R arranged on both left and right sides of the camera.

On the end side of the transfer bar 12, a transfer unit 16 is arranged. Transfer unit 16
Constitute a total station. The general station drives the transfer bar 12 to convey the work, for example, in the direction of the arrow in the figure. Each station 10 processes the conveyed work from the left and right sides by the left and right units 1, 4-L and 14-R.

Further, the transfer machine shown in this figure is controlled by a multiple PC control device composed of multiple PCs (programmable controllers).

That is, each unit 14 is provided with a PC 18. Also, the transfer unit 16
A PC 20 is provided, and the PC 18 and the general PC 20 are connected to each other by a link line 22.

The PC 18 and the general PC 20 operate according to a so-called sequence program, and control the corresponding unit 14 or 16. In the conventional example, the control target is the corresponding unit 14 in the case of the PC 18 and the transfer unit 16 in the case of the general PC 20. The integrated PC 20 controls the transfer unit 16 in addition to the control of the transfer unit 16.

The PC 18 and the integrated PC 20 operate in accordance with the sequence program, and exchange data with each other via the link line 22 to operate in parallel. As a result of such an operation, for example, several tens of stations 10 perform processing and the like in cooperation with each other, and a series of work as a transfer machine is performed.

FIG. 7 shows a configuration relating to creation and driving of a sequence program in the transfer machine.

As shown in this figure, a sequence program for operating the PC 18 and the general PC 20 is usually created as a file 100 by the sequence program creating device 24 and downloaded from the peripheral device 26 to the PC 18 and the general PC 20.

That is, when operating the transfer machine, first, the user operates the sequence program creating device 24 to create a sequence program. The created sequence program is stored in a file 100, and the file 100 is accessed by the peripheral device 26. The peripheral device 26 downloads the sequence program to each PC 18 and the integrated PC 20 individually or collectively.

FIG. 8 shows the configuration of a sequence program creating device 24 in this conventional example.

The sequence program creation device shown in FIG.
A dialogue input processing unit 28 for performing a dialogue input process with the user, a code input processing unit 30 for performing a process related to a code input from the user, and a comment input process for performing a process related to a comment input from the user Unit 32, a PC program creation processing unit 34 that creates a sequence program based on the input code and the like, a PC automatic address assignment processing unit 36 that automatically assigns an address to the created sequence program, and a created sequence program. A PC program output processing unit 38 for outputting, a contact table creation processing unit 40 for creating a contact table according to the sequence program, a circuit creation unit 42 for creating a circuit based on the sequence program, and the created drawings are collectively used. It includes a drawing batch diversion processing unit 44 and an automatic drafting output processing unit 46 that automatically outputs created drawings. That is, based on the dialogue input processing by the dialogue input processor 28, the code input processor 30 and the comment input processor
The sequence program input from 32
At 42, a ladder diagram described later is created and printed out by the automatic drafting output processing unit 46, while being output as a file 100 by the PC program output processing unit 38. At this time, the PC automatic address assignment processor
36 automatically assigns an address.

The sequence program is generally created as a ladder diagram. The ladder diagram is composed of addresses, command words, signal names, and the like.

 FIG. 9 shows an example of a ladder diagram.

The address is assigned to each command word so that it is unique within at least one PC 18, that is, does not overlap with other addresses. In this figure, "00
11 "," 2011 ", etc.

The instruction word is represented by a symbol in the figure,
An instruction to set conditions for signal output And instructions related to signal output Is represented.

For example, the unit 14 includes “continuous operation”, “during operation”,
An operation state such as "processing completed" can be taken.

In order to cause a necessary operating state to occur under a necessary condition among these operating states, it is necessary to determine an output instruction relating to the operating state and an output condition on a sequence program. The command word defines these.

On the other hand, the signal name is shown as characters such as “11R1A” and “11D1A”, and the command word uniquely represented by the address is
It is expressed in a form readable by the user.

For example, the signal name “11R1A” is the first of the input signals and indicates “continuous selection”. Also, “11D1A” refers to the arrangement of PC18 or PC20 in the transfer machine,
18 or the operation command of the integrated PC 20 is shown.

FIG. 10 shows the latter, that is, the rule of screen assignment of signal names including arrangement and operation commands.

Here, PC18 or general
The arrangement of the PC 20 means that each PC 18 or the total PC 20 and the unit 14 or
It means the correspondence with 16.

For example, as shown in FIG. 6, when the units 14 are located on the left and right sides of the transfer bar 12, whether the units 14 are on the left side or the right side of the transfer bar 12,
, Each PC 18 can be classified. In addition, it can be classified according to the station number to which the station 10 belongs. The arrangement of the PC 18 or the integrated PC 20 can be represented using such a division.

The operation command corresponds to the operation state of each unit 14 and indicates the control content of the corresponding unit 14.

Therefore, the output command related to the control of each unit 14 can be uniquely represented by the information, that is, the signal name obtained by combining the arrangement and the operation command.

Also, this expression is different from an address that is also unique, and is a human-readable expression. More specifically, the signal names are assigned to have the following configuration.

n ₁ n ₂ XXY where n ₁ is the station 10 to which the unit 14 belongs
, That is, the station number. Further, n ₂ is a variable indicating whether the unit 14 is the left unit 14-L or the right unit 14-R, for example,
When n ₂ = 1, the left unit 14-L, and when n ₂ = 2, the right unit 14-R. Thus, the n ₁ and n _2, so that the arrangement of the unit 14 is shown. Therefore, n ₁ , n
₂ is called the device code.

XXY is an operation command. For example, if the operation command is “D
In the case of “1A”, “D1” indicates the first dummy coil, and “A” indicates selection of “continuous operation”. “A” is called a function code.

FIG. 11 shows an example of the configuration of the PC 18. In addition,
Since the configuration of the integrated PC 20 is basically the same, the description is omitted here.

The PC 18 shown in this figure includes a memory unit 48 and a CPU unit 50. The memory unit 48 is a unit that stores a sequence program, and includes a command word unit 52 that stores a command word of the sequence program, an I / O address unit 54 that stores an address, and a signal name unit 56 that stores a signal name. And a link management table unit 58 for storing a link management table. The link management table is a table that associates an output command with another PC 18 to which a link should be made in accordance with the output command and data to be received from the PC 18.

Further, the CPU unit 50 performs control of the corresponding unit 14 based on the content stored in the memory unit 48, and a signal name / address by referring to the signal name / address correspondence table. And a signal name information interpreting unit 62 that refers to the I / O address unit 54 based on the result of the conversion and the obtained address.

That is, in the PC 18 shown in this figure, the corresponding circuit 14 is controlled by the control circuit processing unit 60 based on the sequence program stored in the memory unit 48, and stored in the link management table unit 58. Data is supplied to other PCs 18 as needed based on the link management table. Conversely, data supplied from another PC 18 is converted into a signal name by the link management table unit 58, and the control unit processing unit 60 controls the corresponding unit 14 based on the result.

By the way, in the transfer machine, each unit 14
In general, a control state display device is provided to monitor the operation of the device. Usually, the control status display device is
It has a function as an operation display panel that shows the operation state of 14 and a function that shows the flow status in the transfer machine in a cycle diagram.

FIG. 12 shows a configuration of a control state display device according to this conventional example, and FIG. 13 shows a control state display device and a PC.
The connection with 18 is shown.

A control state display device 64 shown in FIG. 12 has a configuration in which a screen output function is added to the general PC 20, and a control unit 66 having the same configuration as the PC 18 shown in FIG.
, Etc., and a screen output unit 68 connected to a display device.

Further, as shown in FIG. 13, the control state display device 64
Are connected to the respective PCs 18 via link lines 22.
That is, each of the PCs 18 and the control state display device 42 are connected to the interfaces 70 and 72 related to the connection with the link line 22, respectively.
It has.

The display on the control state display device 64 is the display of the operation display panel or the display of the cycle diagram as described above. FIG. 14 shows an example of the operation display panel, and FIG. 15 shows an example of the cycle diagram.

First, the operation display panel displays the operation state of each unit 14 for each signal name. For example, the display 104-A indicates “continuous operation” of the unit 14 related to the display 102, and the display 104-A
G indicates "during operation", and the display 104-K indicates "processing completed". These displays are provided corresponding to each unit 14. The cycle diagram is a diagram showing, for example, an operation transition of equipment in a certain unit 14.

Such display of the operation state of each unit 14 is performed according to a screen display program and a screen operation program.

That is, in addition to the sequence program described above, a screen display program for creating a screen format in the control state display device 64 is required. This screen display program is a program for generating and displaying a screen in a predetermined format (for example, in the form of an operation display panel) on the screen of the display unit. Is done.

Also, when driving the transfer machine,
In order to receive a signal from the PC 18 and perform dynamic display according to a change in the operation state of each unit 14, a screen operation program is required. This screen operation program is created in the form of a ladder diagram, like the sequence program. That is, the screen is created to operate according to the output command of the sequence program. The screen operation program is also input to the control state display device 64 from the keyboard or the peripheral device 26 (not shown).

As described above, conventionally, it has been possible to control the transfer machine and display the operation state thereof.

[Problems to be Solved by the Invention] However, conventionally, it has been necessary to create and drive a screen display program. Since a great amount of time is required for the creation and driving, there are problems such as a delay in starting up a plurality of PC control devices and an increase in manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to eliminate the creation and driving of a screen display program and to enable a short-term and inexpensive start-up of a plurality of PC controllers. With the goal.

[Means for Solving the Problems] In order to achieve such an object, a display screen creation method of a multiple PC control device according to the present invention uses a signal corresponding to each combination of PC arrangement and control state in a production facility. Determines whether the name exists as a signal name related to the output instruction in the sequence program, creates a display table that associates the determination result with the arrangement and control state of each PC, and creates a screen format based on the display table It is characterized by the following.

Further, the sequence program creation device of the present invention is a means for indicating, for each combination of the arrangement and control state of each PC in a production facility such as a transfer machine, whether or not the combination is included in the sequence program related to the output instruction. And means for creating a display table for associating each combination with the presence or absence of a signal name, and means for outputting the display table as data.

The control state display device according to the present invention is configured such that, for each combination of arrangement and control state of each PC in a production facility such as a transfer machine, whether a signal name related to the combination and corresponding to the output instruction is included in the sequence program. And a display processing unit that creates a display table that associates the arrangement and control state of each PC with the result of this determination, and creates a screen format based on the display table.

[Operation] In the display screen creation method of the multiple PC control device of the present invention, a display table is created based on the signal names of the sequence program. This display table is a table that indicates a combination of the arrangement and the control state of the PC in the production equipment such as the transfer machine, and associates the presence or absence of a signal name related to the output instruction. Further, a screen format is created based on the display table. As a result, the screen format is automatically created according to the contents of the sequence program. Therefore, it is not necessary to particularly create and enter a screen display program.

Further, in the sequence program creation device of the present invention, for each combination of the arrangement and control state of each PC in the production equipment, it is determined whether the signal name corresponding to the combination and the output instruction exists in the sequence program. Is determined. The result of this determination is associated with the arrangement and control state of each PC. That is, a display table showing these correspondences is created. The created display table is output together with the sequence program and supplied to, for example, a control state display device. Accordingly, a display table is automatically created at the same time as the creation of the sequence program, and is used for, for example, display by a control state display device, particularly creation of a screen format.

Then, in the control state display device of the present invention, the signal name of the sequence program stored in the memory unit is used for determination in the drawing processing unit. This determination is for each combination of the arrangement and control state of each PC in a production facility such as a transfer machine, whether or not a signal name related to the combination and indicating an output instruction exists in the sequence program. The result of this determination, that is, the presence or absence of the signal name is associated with a combination of the arrangement and control state of each PC. As a result, a display table relating to this correspondence is created by the drawing processing unit. Further, a screen format is created by the image creation processing unit based on the display table. Therefore, a screen in a predetermined screen format is displayed without particularly creating and inputting a screen display program.

EXAMPLES Hereinafter, preferred examples of the present invention will be described with reference to the drawings. The same components as those of the conventional example shown in FIGS. 6 to 15 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows a block configuration of a sequence program creating apparatus according to a first embodiment of the present invention.

In this embodiment, an equipment monitor screen information creating unit 74 according to the features of the present invention is provided. The equipment monitor screen information creating section 74 is a section for creating a display table according to the features of the present invention.

FIG. 2 shows the concept of creating a display table in this embodiment.

In this embodiment, for example, when a user inputs a sequence program according to the ladder diagram 200 by an interactive input process, a display table according to the features of the present invention is created by the equipment monitor screen information creating section 74.

That is, as described above, the signal name of the sequence program includes the arrangement of the PC 18 in the transfer machine and the operation command. Arrangement of PC18 contained in the signal name, station number n ₁ and the corresponding unit 14 is constituted by the variable n ₂ indicating whether L side or R side. The variable n ₁ in the column, if taking the variables n ₂ in a row, the arrangement of the PC18 in the transfer machine and thus represented as placement table 220 of FIG. 2. Furthermore, if each PC 18 is classified according to “continuous operation”, “during operation” or “processing end”,
The arrangement table 220 is a table in which the row direction is divided into six.

The equipment monitor screen information creation unit 74 in the present embodiment,
It is determined whether or not the operation command indicated as each grid in the arrangement table 220 exists as an output command in the sequence program, and if so, the graph corresponding to each grid is set to “1”, and does not exist. In this case, “0” is set.

After the above operation, the equipment monitor screen information creating unit 74 creates the display table 210 including the arrangement of the PC 18, the operation command, and the flag, and causes the PC program output processing unit 38 to output the table together with the sequence program.

FIG. 3 shows the operation of creating the display table 210 in this embodiment in more detail.

First, when the process is started, the initial set 300 is executed. This initial set 300 is performed, for example, according to the flow shown in FIG. That is, in the initial set 300, the operation command SIGNAL is changed to “” (3
02), the sequence program address PCADD becomes 0 (3
04), the instruction word SYMDATA indicated by the address PCADD is ""
(306), the address ADDDATA of the sequence program indicated by the address PCADD becomes “” (308), and the address PCADD
The signal name SYGDATA of the sequence program indicated by ADD is set to “” (310), the comment COMDATA of the sequence program indicated by the address PCADD is set to “” (312), and the flag FLGDT in the m-th row and the n-th column of the display table. (M, n) becomes 0 for all m, n (314), and the operation command classifying variable is l
Is initialized to 0 (316), m is initialized to 0 (318), and n is initialized to 0 (320). Here, m takes a value of 1 or more and M or less, and n takes a value of 1 or more and N or less. That is, the display table 210 is a table having M rows and N columns.

When the initial set 300 is executed in this way, the structure of the signal name is defined (322). That is, the signal name SGNNAME is defined as SGNNAME = n ₁ + n ₂ + SIGNAL. Here, n ₁ is the number of stations unit 14 belongs, n ₂ is the unit left side unit 14-
It is a variable indicating whether it is L or right unit 14-R.

When the definition 322 is executed, the operation command classification variable 1 is set to 1 (324). That is, the operation classification variable 1 is initially set to 0 in the initial set 300, and the operation command classification variable l is set to 1 by adding 1 in step 324.

Next, a determination 326 is performed. In the determination 326, it is determined whether or not the operation command classification variable l is 1. Here, since the operation command classifying variable 1 is set to 1 in step 324, step 328 is executed after the determination 326. In step 328, the operation command SIGNAL is set to “D1
A "is set to" A ". This" D1A "indicates continuous operation selection by the dummy coil D1 as described above.

Thereafter, the command word SEQDT (PCADD) indicated by the address PCADD is set in the command word SYMDATA (330). At this time, the address PCADD is set to “0” in the initial set 300.
Instruction, the instruction word SYMD related to the start address
The ATA will be read. After the execution of the step 330, the determination 332 is executed. In the judgment 332,
It is determined whether the command word SYMDATA indicates "END". Here, if it is determined to indicate “END”, the process ends (334), and otherwise, the determination 336 is performed.

In the decision 336, it is determined whether or not the command word SYMDATA is an output command. Here, if it is determined that the instruction is not an output instruction, there is no need to set the flag FLGDT (m, n), so the process proceeds to step 338, and the address PCADD is incremented by one. After the execution of step 388, the flow shifts to step 330 to detect the output instruction, and the instruction SYMDA
TA is read.

If it is determined in the decision 336 that the command word SYMDATA is a command word indicating an output command, step 340 is executed. In step 340, the signal name SIGDT (SYMDATA) corresponding to the command word SYMDATA is set to the signal name SIGDATA.

Thereafter, determination 342 is performed. In decision 342,
It is determined whether or not the operation command SIGNAL set in step 328 matches the operation command included in the signal name SIGDATA determined in step 340. here,
If it is determined that they do not match, the process returns to step 324 described above, and the processing is continued after the operation command classification variable l is incremented.

If it is determined in the determination 326 that the operation command classification variable l is not 1, the determination 344 is executed, and it is determined whether the operation command classification variable l is 2 or not. The same determination is made for all possible values of the operation command classification variable l. Also, judgment 34
If it is determined in step 4 that the operation command classification variable l is “2”, the operation command SIGNAL is set to “D1G”, and the operation command SIG is set to correspond to each grid of the arrangement table 220.
NAL is set respectively. After the setting is performed, the process shifts to step 330 every time the step 328 is completed, and the above-described operation is repeated.

When it is determined in the determination 342 that they match, the row number n is incremented by 1 (348). Then the number of rows n of whether matching station number n ₁ determined 348
Is executed, and if not, the step 346 is continued.
Is executed to increment the number of rows n. Here, the station numbers n ₁ are intended to be included in the signal name SIGDATA. Line number n by repeating this is incremented until it matches the station number n _1. Thereafter, step 352 is subsequently executed.

In step 350, the number of columns m is incremented by one. Next, the judgment 354 is executed, and the number of rows m is set to the variable n ₂
Is determined. The variable n ₂ is included in the same signal name SIGDATA the station number n ₁ of the foregoing.
This step 352 and the judgment 354 are also performed at the step 348 and the judgment 3
It is repeatedly executed as shown in 50, and as a result, the number of columns n and the number of rows m are equal to n ₁ and n ₂ respectively.

That is, in the signal name SIGDATA, the variables n ₁ and n ₂ indicating the arrangement of the PC 18 are set to the number of rows m rather than the number of columns n.

Further, step 356 is performed. In step 356, (n ₂ -1) (4-1) +1 is set for the number m of rows.
With this setting, the number m of rows is converted into a value corresponding to each grid of the arrangement table 220. Subsequently, step 358 is executed, and the flag FLGDT (m, n) of the display table 210 is set to 1.

Subsequently, the initial values of the number m of rows and the number n of columns are set to 0 (360,362). Then, the aforementioned step 338 is executed, and the process returns to step 330.

This kind of operation continues until the end of the sequence program.
That is, the process is executed until “END” is detected in the determination 332, so that the display table 210 is created for the entire sequence program.

Therefore, in the present embodiment, the display table 210 based on the sequence program related to the input from the user is used.
Is created automatically. By supplying the display table 210 created in this way to, for example, a control status display device, the control status display device can generate a screen format using the display table 210. In this case, there is no need to create and drive a screen display program in the control status display device, and the man-hour required for the creation and driving is not required. Therefore, by reducing the man-hours, it becomes possible to start up the multiple PC control device early and at low cost.

FIG. 5 shows the configuration of a control status display device according to a second embodiment of the present invention. In this embodiment, a condition setting section 76 and a drawing screen information section 78 are provided in the memory section 26, and a drawing processing section 80 is provided in the signal name information interpretation section 62. The condition setting unit 76 stores a display table according to the features of the present invention. This display table is based on the signal names stored in the signal name
Created by The drawing screen information section 78 includes a fixed part of a screen format to be displayed on the screen of the display unit,
For example, a part related to the frame of each lattice in the above-described arrangement table 220 is stored. Further, the drawing processing unit 80 includes a condition setting unit 76.
Creates a screen format based on the display table recorded in.

That is, in the present embodiment, similarly to the conventional example shown in FIG. 7, the sequence program created and filed by the sequence program creating device 24 is loaded via the peripheral device 26. The fetched sequence program is stored in the memory unit 26. Image processing unit 80
Creates the display table 210 by the same algorithm as in the first embodiment, and stores it in the condition setting unit 76. Image processing unit 8
0 is the display table 210 stored in the condition setting unit 76
Then, a screen format is created based on the information stored in the drawing screen information section 78. For example, the display table 210
In, for the operation command in which the flag FLGDT (m, n) is set to “1”, a display column is provided in a predetermined portion of the framework read from the drawing screen information unit 78. Conversely, no display column is provided for an operation command whose flag FLGDT (m, n) is "0".

The screen format including the display fields set in this way is
It is supplied from the unit 28 to the screen output 68. The screen output unit 68 causes the display to display based on the screen format created in this manner.

As described above, according to the present embodiment, for example, display as an operation display panel can be performed by interpreting a signal name without creating a screen display program.

In the above description, for example, the creation of the screen format according to the operation display panel as shown in FIG. 14 has been described. Instead, the screen format according to the cycle diagram as shown in FIG. You may make it create. In this case, a code indicating the corresponding circle and, for example, “40” are added after the signal name having the above-described configuration, and “11D1A4
0 "or the like. By doing so, the signal name information interpreting section 62 interprets this and sets the flag FLGDT (m, n),
The condition setting unit 76 can store the screen format related to the cycle diagram. As a result, it is possible to generate a screen format according to the cycle diagram as shown in FIG.

In the above embodiment, one station
Although the transfer machine in which 10 is composed of two units 14-R and 14-L has been described, the present invention is also applicable to a configuration in which each station 10 includes an upper unit disposed above the transfer bar 12. is there.

Further, the control state display device may be configured integrally with the general PC 20 or may be configured separately.

 Furthermore, one PC may be used.

[Effects of the Invention] As described above, according to the present invention, a display table is created and a screen format is automatically generated based on the display table. It can be abolished, and it is possible to start up a multiple PC control device quickly and inexpensively with reduced man-hours.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a sequence program creating device according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a concept of creating a display table in this embodiment, and FIG. FIG. 4 is a flowchart showing the operation of the initial set in FIG. 3, and FIG. 5 is a flowchart showing the operation of the control state display device according to the second embodiment of the present invention. FIG. 6 is a block diagram showing a configuration of a transfer machine, FIG. 7 is a block diagram showing a configuration relating to creation and driving of a sequence program, and FIG. 8 is a sequence program creation according to a conventional example. FIG. 9 is a block diagram showing the configuration of the device, FIG. 9 is a diagram showing a ladder diagram, FIG. 10 is a conceptual diagram showing the contents of signal names, FIG. 11 is a block diagram showing the configuration of a PC, FIG. Is FIG. 13 is a block diagram showing a configuration of a control state display device according to a conventional example, FIG. 13 is a block diagram showing connection between the control state display device and a PC, FIG. 14 is an explanatory diagram showing an operation display panel, FIG. FIG. 4 is an explanatory diagram showing a cycle diagram. 74: Equipment monitor screen information creation section 76: Condition setting section 78: Screen creation screen information section 80: Screen creation processing section 210: Display table n ₁ ... Station number n ₂ ... L, R side Variable indicated SIGNAL …… Operation command SGNNAME …… Signal name PCADD …… Address SYMDATA …… Command word

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-45803 (JP, A) JP-A-2-1003 (JP, A) JP-A-61-195408 (JP, A)

Claims (3)

(57) [Claims] 1. A multi-PC control comprising: means for controlling a plurality of PCs arranged in a production facility such as a transfer machine in accordance with a sequence program; and means for displaying a control state of each PC on a screen in a predetermined screen format. In the apparatus, for each combination of the arrangement and control state of each PC in the production equipment, it is determined whether a corresponding signal name exists as a signal name related to an output instruction in a sequence program, and the result of the determination is assigned to each PC. And a display table corresponding to a control state, and a screen format is generated based on the display table. 2. A means for inputting a sequence program,
Means for outputting data of at least an address and a command word among the constituent elements of the input sequence program, a sequence program creating apparatus comprising: Means for indicating a combination and determining whether or not a signal name relating to an output instruction is included in a sequence program; means for creating a display table for associating each combination with the presence or absence of a signal name; Output means, and a sequence program creating apparatus. 3. A memory section for storing a sequence program, a control circuit processing section for taking in data relating to a control state from each PC, and a screen for supplying a screen showing a control state of each PC to a display device in a predetermined screen format. And a control state display device having an output unit, for each combination of the arrangement and control state of each PC in a production facility such as a transfer machine, whether a signal name related to the combination and corresponding to the output instruction is included in the sequence program. A control state display characterized by having a drawing processing unit for determining whether or not the arrangement and control state of each PC and the result of this determination are associated with each other and creating a screen format based on the display table. apparatus.