JP2003084811A - Ladder monitor device, and its program and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a ladder monitor device capable of properly grasping the correlation of devices and a condition of each device without lowering the visibility of a ladder monitor. SOLUTION: A control-HMI processing part 41 of a programmable display device 12 displays a ladder diagram indicating a control program of a device control part 33, and schematically displays a ladder signal corresponding to each device 2a by a display method corresponding to a condition of the device 2a controlled by the device control part 33. When a user of the programmable display unit 12 estimates the device 2a causing the abnormality on the basis of the condition of each device 2a and the correlation, and selects the ladder signal, the control-NHI processing part 41 enlarges and displays the ladder signal with the character displays of a name, an address and the condition of the device 2a, which are omitted in the schematic display screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder monitor device capable of displaying a ladder monitor screen without impairing visibility, and a program and a recording medium for realizing the same.

[0002]

2. Description of the Related Art Conventionally, for example, an apparatus capable of displaying a ladder monitor screen (ladder monitor apparatus) has been used to identify a device causing an abnormality when an abnormality occurs in a device state. . The ladder monitor device is a programmable logic controller (hereinafter,
It is possible to display the control program of the control device for controlling the device such as PLC) as a ladder diagram, and display the state of the device corresponding to each by the display method of each ladder symbol in the ladder diagram.

As a result, the user of the ladder monitor device grasps the state of each device by the display method of the ladder symbol and the control procedure of each device by the connection relation of the ladder symbol, and the state becomes abnormal. It is possible to estimate the device group related to the control of the device. As a result, even if the device in which the abnormality is detected and the device that caused the abnormality are different, identify the device that is the cause, operate the device, replace it, etc. It is possible to return to a normal state.

[0004]

However, when the screen resolution is not sufficient, for example, when a display device installed in the field such as a programmable display is also used as a ladder monitor device, simultaneous display is possible. The number of ladder symbols is reduced, and it may be difficult to understand the mutual relationship between each device.

Further, for example, when all the information associated with the ladder symbol such as the device name corresponding to the ladder symbol and the ladder symbol are displayed on the ladder monitor screen, a large number of ladder symbols can be grasped so that the mutual relationship between the devices can be grasped. If the entire screen is reduced so that can be displayed, if the resolution of the screen is not sufficient, these pieces of information cannot be read.

The present invention has been made in view of the above problems, and an object of the present invention is to accurately determine the interrelationship of devices and the state of each device without reducing the visibility of the ladder monitor. It is to realize a ladder monitor device that can be grasped.

[0007]

In order to solve the above-mentioned problems, a ladder monitor device according to the invention of claim 1 displays a control program for controlling a device as a ladder diagram and corresponds to a ladder symbol. In a ladder monitor device having a ladder monitor means for changing the display method of the ladder symbol according to the state of the device, with the ladder symbol, a detailed screen that also describes detailed information related to the ladder symbol, and a part of the detailed information or All of them are omitted, and a display control means for switching and displaying on the ladder monitor means a schematic screen for roughly displaying more ladder symbols than the ladder symbols displayed on the detailed screen is provided.

In the above arrangement, the ladder monitor means is
When the display control means instructs the outline screen display, some or all of the detailed information related to the ladder symbol is omitted, and more ladder symbols are displayed than in the case of the detailed screen display in which all the detailed information is written together. To do. As a result, the user of the ladder monitor device can be
With the display method of each ladder symbol, the outline of the state of each device corresponding to the ladder symbol can be grasped and the mutual relation between the ladder symbols can be grasped, so that the device causing the abnormality can be easily guessed.

Here, in the summary screen, more ladder symbols are displayed by a display method according to the state of the device than in the detail screen, but the display of some or all of the detailed information is omitted. ing. Therefore, the user can more accurately understand the interrelationship of the devices, and can accurately discover the device for which detailed information should be acquired.

When the entire screen including all the detailed information is reduced and displayed, if the reduction ratio is increased so as to display a large number of ladder symbols to the extent that the mutual relationship of the devices can be grasped, the detailed information cannot be read. There is fear. In this case, the display area of the detailed information is wasted, and the screen becomes difficult to see. However, in the above configuration, the display of part or all of the detailed information is omitted, so that even if many ladder symbols are displayed, it is possible to prevent the visibility of the ladder monitor from being degraded.

On the other hand, when the display control means gives an instruction to switch to the detailed screen, the ladder monitor means displays, for example, a character string indicating the state of the ladder symbol, the name of the device corresponding to the ladder symbol, or the device. All detailed information related to the ladder symbol, such as the address of, is displayed together with each ladder symbol. Thereby, the user of the ladder monitor device can accurately determine whether or not the device corresponding to the ladder symbol is the cause of the abnormality, based on all the detailed information. Further, since all the detailed information is displayed, it is easier to understand the procedure for recovering from the abnormality than when the detailed information is not displayed or only a part of the detailed information is displayed.

It should be noted that the detailed screen displays more detailed information than the general screen, but displays fewer ladder symbols than the general screen. Therefore, the user can more accurately understand the state of each device even when the screen is displayed on the screen having the same size as that of the general screen display.

As described above, since it is possible to switch the outline screen in which it is easy to grasp the interrelationship of the devices and the detailed screen of the state of each device, the interrelationship of the devices and the interrelationship of the devices can be realized without lowering the visibility of the ladder monitor. You can accurately understand the status of each device.

Further, in the ladder monitor device according to the invention of claim 2, in the configuration of the invention of claim 1, when the ladder symbol displayed on the outline screen is selected, the display control means selects the ladder symbol. It is characterized by displaying a detailed screen including.

According to the above configuration, the detailed screen including the ladder symbol selected on the schematic screen is displayed. Therefore, for example, when designating by the name of the device corresponding to the ladder symbol, it is designated by another method. It's easier than ever to choose which ladder symbol to display with all the details.

A ladder monitor device according to a third aspect of the invention is the ladder monitor device according to the first or second aspect of the invention.
According to the control program, a control means for controlling the device, and a graphic of a display method according to the state of each device,
The display device is characterized by comprising operation means for displaying the state of each device and for instructing the control means to control the device according to the operation when the operation for the graphic is accepted.

According to the above configuration, in the control system, the device provided with the indispensable means, that is, the control means as the control device and the operation means as the HMI (Human Machine Interface) also operates as the ladder monitor device. To do. Therefore, when an abnormality occurs, the abnormal device can be identified by the ladder monitor without bringing new equipment to the site. As a result, the time required to return to normal operation can be shortened.

By the way, the ladder monitor device may be realized by hardware, or may be realized by causing a computer to execute a program. Specifically, claim 4
The program according to the invention of claim 1 is a program for operating a computer as each unit according to claim 1, and the program according to claim 4 is recorded on the recording medium according to the invention of claim 5.

When these programs are executed by the computer, the computer operates as the ladder monitor device according to claim 1. Therefore, claim 1
Similarly, the mutual relationship between devices and the state of each device can be accurately grasped without reducing the visibility of the ladder monitor.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention.
The following is a description with reference to FIG.
That is, the control system 1 according to the present embodiment is a system in which the ladder monitor screen is displayed by a trigger desired by the user and display control is possible without bringing new equipment to the site, and as shown in FIG. For example, it is used to control the device 2a of the target system 2 such as a belt conveyor type automatic assembly machine.

The control system 1 includes the device 2
PLC 11 as a control device for controlling a, and in many cases, a programmable display that is arranged in the vicinity of the control target and that displays the state of the device 2a as the HMI of the control system 1 and that accepts an operation on the device 2a by an operator. And a container 12. Further, as will be described later in detail, the programmable display device 12 according to the present embodiment also has a function as a PLC, and is directly connected not only to the corresponding PLC 11 but also to the device 2a controlled by itself. There is.

Further, the control system 1 according to the present embodiment.
Then, the programmable displays 12 are connected to each other by a LAN (Local Area Network) 13 such as Ethernet (registered trademark). Also, the above L
The AN 13 often includes a programmable indicator 12
A control host computer 14 that manages the entire control system 1 is connected from a place farther away.

Each programmable display 12 described above
Are connected to the corresponding PLCs 11 via serial cables or the like. Further, in FIG. 1, for convenience of description, the programmable display 12 is connected to the LAN 13 by two.
PLC connected to each programmable display 12
11 and the device 2a are connected one by one, and the case where one device 2a is connected to each PLC 11 is shown as an example, but it goes without saying that each connected number can be set arbitrarily.

The device may be, for example, the device 2a itself, or the PLC 11 or programmable device, as long as the device can be identified by the device address and the state can be acquired or controlled (changed). It may indicate an area of the storage device provided in the control system 1, such as the storage device of the display 12.

Here, the control system 1 is an indispensable component of the control system 1 and operates as an HMI. Therefore, the programmable display 12, which has a spare computing power, processes most of the communication. Has been done.
Further, each programmable display 12 has a dedicated protocol unique to the model of the PLC 11 connected to itself,
A common protocol for the LAN 13 is converted to another programmable display 12 or a control host computer 14
And relay communication with the PLC 11. In the protocol conversion between the common protocol and the dedicated protocol, a common command predetermined so that the same code is assigned to the same instruction and the P corresponding to the common command are assigned.
Variables that can be converted to commands specific to LC11, conversion of data and address representation methods, device addresses and variables that can be set to values that correspond to the device addresses and are different from the device addresses (variables). Name) and conversion etc. are also included.

As a result, the programmable display 12 and the control host computer 14 can communicate with each other via the LAN 13 regardless of the model of the PLC 11 connected to the other programmable display 12. As a result, the control system 1 in which PLCs 11 of different models are mixed is realized relatively easily.

The programmable display 12 specifies an operation for displaying the state of the device on the screen and an operation for controlling the state of the device according to an operation on the screen, based on screen data described later. And PLC11
A PLC / IF unit 21 for communicating with the LAN 13, a LAN / IF unit 22 for connecting to the LAN 13, a display 23 including, for example, a liquid crystal display device, and a display 2
3, a touch panel 24 arranged on the screen of FIG. 3, an HMI processing unit 25 for controlling the members 21 to 24, and the HMI.
A screen memory 26 and a variable memory 27, which are referred to by the processing unit 25 and store the screen data and variables described later, are provided. The HMI processing unit 25 and the device control unit 33, which will be described later, correspond to the operating means and the control means described in the claims, respectively.

The screen data is composed of a combination of an area on the screen and a tag indicating a correspondence relationship between a device corresponding to display and input in the area. In the present embodiment, the HMI processing unit 25 can switch and display a plurality of unit screens, and the tag specifies the file number indicating the unit screen for which the tag is valid and the operation content to be executed on the unit screen. The event name and the reference information referred to for each event are included.

For example, when the tag is a display tag that displays a part graphic corresponding to a state of a predetermined device in a predetermined screen area (display coordinate range), the display coordinate range and the device are specified in the reference information. Possible variables (described later) and, for example, when the part graphic is a switch, a file number of a graphic that indicates ON and a file of a graphic that indicates OFF are included in the file number to be referred to at the time of display. Furthermore, when the tag is an input tag, the valid input coordinate range and
Contains the device variables to which the input results will be written.

Further, in the variable memory 27, as shown in FIG. 2, for each variable, a variable name (variable name) and information for specifying the device 2a or the internal memory corresponding to the variable (for example, an address). Etc.) and the contents of the variable are stored. In this embodiment,
Regardless of the model of the device 2a corresponding to the variable, the expression method for storing the content of the variable (for example, word length or presence of code, or BCD / binary notation) is unified to a predetermined expression method. If the variable corresponds to the existing device 2a, the variable memory 27 also has a function of expressing the actual model. In this case, the HMI processing unit 25 causes the device 2 a via the PLC / IF unit 21.
When acquiring or controlling the state of, the format of the expression method is converted to unify the expression method at the time of storage.

On the other hand, the HMI processing section 25 extracts a display tag whose base screen file number is the currently displayed base screen from the screen data stored in the screen memory 26 at predetermined time intervals. Further, the HMI processing unit 25 refers to the variable memory 27, reads out the content of the variable corresponding to the tag, and displays the component graphic corresponding to the content on the display 23. Here, in the device 2a controlled by the PLC 11 connected to the PLC / IF unit 21,
If the above variables correspond, the HMI processing unit 25 determines that P
By communicating with the PLC 11 by the LC / IF unit 21,
The state of the device 2a is acquired, and the content of the variable is updated according to the state. This allows the display 2
At 3, the status of the device 2a is displayed.

Note that the variable is another programmable display 1
In the case of the device 2a controlled by the PLC 11 connected to the LAN 2, the HMI processing unit 25 uses the LAN / IF unit 2
2. The device state is acquired by communicating with the PLC 11 via the LAN 13, the other programmable display 12, and the contents of the variables are updated accordingly.

When an input operation by the operator, such as a push operation on the touch panel 24, is received, the HMI processing unit 25 corresponds to the base screen currently displayed from the screen data and an input tag matching the input operation. And the content of the variable corresponding to the tag is updated according to the input result. Further, the HMI processing unit 25 controls the state of the device 2a according to the content of the variable by communicating with the PLC 11 or the programmable display 12 in substantially the same manner as when acquiring the state of the device 2a.
Here, since the HMI processing unit 25 also displays the state of the device 2a on the screen after the input operation, the operation result is reflected on the screen display.

In addition, the HMI processing unit 25 receives a control instruction from the device connected to the LAN 13, such as another programmable display 12 or the control host computer 14, to the device 2a of the PLC 11 connected to itself. If the status of the device 2a to be reported to the device is received from the PLC 11 of its own, on the contrary, by the protocol conversion described above, the LAN 13
It is possible to relay between the communication in and the communication with the PLC 11.

Further, the programmable display device 12 according to the present embodiment also operates as a PLC, and therefore has an IO / IF unit 31 for connecting to the device 2a, and a control file memory 32 for storing a control program and the like. A device control unit 33 that controls the device 2a connected to the IO / IF unit 31 based on the control program.

The device control unit 33 according to this embodiment is
In the control program, the PLC is a PLC whose control target can be specified by a variable. For example, the state of each device 2a is read at every scanning period (scan time) of a predetermined length such as several tens of ms, and each device is read. The content of the variable corresponding to 2a is stored in the variable memory 27.

Further, the device control unit 33 sequentially executes each instruction indicated by the control program of the control file memory 32 while referring to the contents of each variable stored in the variable memory 27. Here, in each instruction, as in the ladder program shown in FIG. 3, the control object (operand) of each instruction word Cα ... Can be specified by a variable, and the contents of each variable are associated with the execution of each instruction. Will be updated. Further, when the end instruction is executed and the execution of the control program is completed, the device control unit 33 determines which one of the variables stored in the variable memory 27 corresponds to the device 2a connected to the IO / IF unit 31. The contents are written in each device 2a. With this, the device control unit 33 can control each device 2a according to the state of the device 2a according to the control program created by the user, similarly to the PLC.

As described above, since the expression method for storing the contents of variables is unified, the device control unit 33 uses the expression method when communicating with the device 2a via the IO / IF unit 31. The format is converted to unify the representation method at the time of storage.

Further, the programmable display device 12 according to the present embodiment also has a function as a ladder monitor device. For example, when the state of a certain device 2a is abnormal, the device 2a causing the abnormality is detected. A control-HMI processing unit (ladder monitor unit and display control unit) 41 for operating the HMI processing unit 25 and the device control unit 33 in cooperation is provided in order to display a ladder monitor screen that is preferably used when specifying. There is. Further, the variable memory 27 is provided with an area 42 for storing variables relating to the ladder monitor (ladder monitor variables). The control file memory 32 indicates not only the OP code (instruction word) and the operand of the control program but also, for example, variable information, a jump destination label, and how each ladder symbol is connected. Information and information for displaying a ladder diagram corresponding to the control program such as a rung number are also stored.

Here, the ladder diagram is, for example, as shown in FIG. 4, a ladder symbol (Iα) as a functional block represented by figures or other formats such as contacts, coils, counters, and the like.
...) and one or a plurality of networks (L1 ...) Consisting of these and related labels are connected to left and right buses (La · L).
In the diagram described in b), the control procedure can be illustrated by the type of the ladder symbol arranged and the connection relationship of each ladder symbol, and the ladder symbol such as shape, color, or blinking can be displayed. Device 2a in the display format of
The current control status of can also be displayed.

For example, the ladder diagrams of FIGS. 4 and 5 illustrate the control program described as the ladder program in FIG. 3 above, and the ladder symbol Iα indicating load is the ladder symbol Iβ indicating AND. , And a ladder symbol Iγ indicating increment, and is connected to the bus Lb. Therefore, these ladder symbols Iα
~ Iγ and the connection relationship of the ladder symbols Iα to Iγ, the control procedure corresponding to the command words Cα to Cγ, that is,
When the device corresponding to the ladder symbol Iα is in the on state and the device corresponding to the ladder symbol Iβ is in the on state, the procedure of incrementing the counter can be described.

Further, in the ladder diagram of FIG. 4, the ladder symbols Iα and Iδ indicating the load are described in a shape indicating the off state, whereas in the ladder diagram of FIG. 5, both the ladder symbols Iα and Iδ are described. It is described by a shape indicating an ON state. Therefore, from the ladder diagrams shown in FIGS. 4 and 5, not only the control procedure but also the control state of the device, that is, in the case of FIG. 4, the devices corresponding to the ladder symbols Iα and Iδ are in the off state, In the case of, it can also be read that the devices corresponding to the ladder symbols Iα and Iδ are in the ON state. Further, the conductive portions of the bus lines La and Lb and the networks L1 ... Are drawn thick.
In FIGS. 3 to 6, the same Greek letters are affixed to those corresponding to each other, such as the instruction word Cα and the ladder symbol Iα.

Further, the control according to the present embodiment
When the HMI processing unit 41 displays the ladder diagram as the ladder monitor screen, the HMI processing unit 41 also displays buttons B1 to B41 for operating the ladder monitor screen as shown in FIGS. 4 and 5. Instruct 25. Here, the button B1 is a button for instructing to end the ladder monitor, and the button B11 is a network L1 ...
Is a button for instructing the number (rung number). Also,
Buttons B21 to B24 are buttons for instructing the movement (scrolling) of the area displayed on the ladder monitor screen of the entire ladder diagram according to the control program, and correspond to the left, right, up, and down directions, respectively. Furthermore, button B3
Reference numeral 1 is a button for instructing whether the unit of movement is the page unit or the rung unit, and the button B41 switches between decimal display and hexadecimal display when displaying a numerical value in the ladder diagram. Is a button for instructing.

On the other hand, the area 42 for storing the ladder monitor variables in the variable memory 27 is used as an area for storing the contents of the ladder monitor variables to instruct the start / end of the display of the ladder monitor screen as shown in FIG. Bit area M1
And bit areas M21 to M24 for instructing scrolling in the left / right and up / down directions of the ladder diagram, bit area M31 for instructing the unit of scrolling, and when displaying numerical values in the ladder diagram, they are displayed in decimal. Or a bit area M41 indicating whether to display in hexadecimal.

In the above structure, the screen data for the programmable display 12 is created by, for example, the drawing editor of the control host computer 14. In addition, a control file including a control program for the device control unit 33 of the programmable display 12 is created by a control program editor of the control host computer 14 or the like. In each of the above editors, when a device to be operated or referred to is specified by a tag or a control program, a variable corresponding to the device is generated and specified by the variable.

Furthermore, each variable is associated with the actual device 2a or the like by the above editors or the like. Note that not only the actual device 2a but also the storage area of the programmable display device 12 and the macro operation result can be associated with the variable. In this case, the HMI processing unit 2
5 is according to a preset program (macro),
The result of calculating the contents of the variable in the variable memory 27 can be set to the contents of the variable associated with the macro.

Further, as in the case of variables related to screen display, operation or control, the ladder monitor variables are triggered by the above editors, that is, the event that serves as a trigger, that is, the storage area of the device 2a or the programmable display 12 or the macro. Associated with.

Here, in each of the above-mentioned editors, the device is specified by a variable, not the address of the device. Therefore, the correspondence between the actual device 2a and the variable may be associated by the time the programmable display 12 starts its operation, and the screen and control procedure can be designed even when the actual address is not determined. Further, even if the actual address is changed due to the change of the device 2a or the like, it is not necessary to change all the parts related to the device 2a in the screen data and the control program, and the association between the variable and the address is changed. Just enough.

When the association of the screen data, the control program and the variables is completed, these data are transmitted to the programmable display 12 and stored in the screen memory 26, the control file memory 32 and the variable memory 27.
In the above description, for convenience of description, the order of associating the screen data, the control program, and the variable has been described. However, if these data are set before being stored in the programmable display 12, the order is different. Good.

Further, the programmable display device 12 controls the device 2a connected to the IO / IF unit 31 based on the control program, and displays an operation screen based on the screen data. Here, in the control-HMI processing unit 41, the content of the ladder monitor variable is a value indicating that the ladder monitor is activated (the area M1 shown in FIG.
N) is monitored, and the ladder monitor is not activated until the value reaches a value indicating activation. Therefore, the display of the operation screen and the control of the device 2a are repeated until the event that triggers the ladder monitor screen display occurs.

As an example, by associating the variables with each other, the area M1 of the ladder monitor variables becomes IO.
When it is associated with ON / OFF of the device 2a connected to the IF unit 31, the device control unit 33 updates the area M1 according to ON / OFF of the device 2a. Therefore, when the device 2a is turned on, the value of the area M1 is turned on.

In this way, when an event that triggers the ladder monitor screen display occurs and the value of the area M1 is turned ON, the control-HMI processing unit 41 causes the control-HMI processing unit 41 to perform step 1 (hereinafter, step S1 in FIG. 7). In this case, the HMI processing unit 25 is instructed to display a schematic screen of the ladder monitor.

Specifically, the control-HMI processing unit 41 instructs the HMI processing unit 25 to display the screen prepared in advance for the ladder monitor in the screen data. As a result, the buttons B1 to B41 are displayed as shown in FIGS. 4 and 5. In addition, control-
The HMI processing unit 41 analyzes the contents of the control file memory 32, grasps the ladder symbols included in the ladder diagram indicated by the control program and the connection relationship between the ladder symbols, and displays the ladder diagram. , HMI processing unit 25.

More specifically, the control-HMI processing section 41 specifies the variables necessary for displaying the ladder diagram based on the control file. Further, the control-HMI processing unit 41 notifies the device control unit 33 of the variable name for each of these variables, and the device control unit 33
From among the addresses of the variable memory 27, the address in which the content of the variable of the variable name is stored is received. further,
The control-HMI processing unit 41 accesses the address and acquires the content of the variable.

When the contents of each variable can be acquired, the control-HMI processing unit 41 instructs the HMI processing unit 25 to display the ladder symbol corresponding to each variable in the display format according to the content of each variable. Give instructions.

Here, the content of the variable corresponding to each device 2a is updated by the HMI processing section 25 or the device control section 33, and the acquisition of the content of the variable and the display instruction according to the content are instructed to end. Up to a predetermined cycle. As a result, a ladder diagram corresponding to the state of the device 2a is displayed on the display 23, as shown in FIG. 4 or FIG.

Further, in the above screen data, each button B1
To B41 are displayed, and the HMI processing unit 25 changes the regions M1 to M41 corresponding to the ladder monitor variables when the buttons B1 to B41 are operated. On the other hand, the control-HMI processing unit 41 constantly monitors the contents of the ladder monitor variable, and according to the contents,
Scroll the ladder monitor screen or change the expression method of the numerical values displayed on the ladder monitor screen.

Here, unlike the detailed screen described later, in the summary screen, the display of detailed information of each ladder symbol such as the name and address of the device 2a corresponding to the ladder symbol is omitted, but more ladders are displayed. The symbol is displayed. The state of the device 2a corresponding to the ladder symbol is presented by the display method of the ladder symbol. Therefore, the user can grasp the outline of the state of the device 2a on the outline screen.

Further, since more ladder symbols are displayed, it is easy to understand the connection relationship between each ladder symbol,
When the state of a certain device 2a is abnormal, the device 2a group related to the abnormal state can be easily grasped. As a result, it is easy to guess the device 2a that has caused the abnormal state. As a result, even if an abnormality is detected in the device 2a different from the device 2a in which the defect has occurred, it is easy to identify the device 2a in which the defect has occurred.

Here, in the case where the entire ladder diagram including the above detailed information is displayed in a reduced size, if the same number of ladder symbols as the outline screen is displayed, the reduction rate becomes high and the detailed information is crushed and readable. There is a risk of disappearing. In this case, although the detailed information is displayed in a reduced size, this display area is wasted, and it is difficult to grasp the state of the device 2a indicated by the ladder symbol and the mutual relation of the ladder symbol.

On the other hand, since the detailed information is not displayed in the schematic display, the state and mutual relationship of the device 2a can be presented to the user without lowering the visibility.

On the other hand, when the user suspects the device 2a that is the cause of the abnormality while displaying the summary screen,
When the ladder symbol you want to display detailed information is decided, for example,
A desired ladder symbol is designated by operating the touch panel 24 or the like.

In this case (YES in S2), the control-HMI processing unit 41 specifies the operated ladder symbol (for example, the ladder symbol Iγ shown in FIG. 4) based on the operation position in S3. Then, as shown in FIG. 8, detailed information of the device 2a such as a character display of the state of the device 2a associated with the ladder symbol, a name of the device 2a and an address of the device 2a is displayed on the ladder symbol as a detailed screen. Displayed together.

Specifically, when the control-HMI processing unit 41 causes the HMI processing unit 25 to display a schematic screen,
For each ladder symbol, the position of the ladder symbol and the content of the variable corresponding to the ladder symbol are indicated. Therefore, when the ladder symbol is specified based on the operation position,
The control-HMI processing unit 41 can specify the selected ladder symbol. Further, the control-HMI processing unit 41 reads out the name and address of the variable corresponding to the ladder symbol from the variable memory 27, and causes it to be written together with the ladder symbol. Furthermore, the HMI processing unit 2 is configured to display the ladder symbol in an enlarged manner by a display method according to the content of the variable.
5 is instructed and the contents of the variable are instructed to be displayed as a character string. As a result, the device 2
Letters indicating the name, address, and state of a are written together with the ladder symbol.

The control-HMI processing unit 41 keeps waiting until the general screen display is instructed (NO in S4).
The process of S3 is repeated. This allows the device 2a
The display method of the ladder symbol and the character display of the state of the device 2a are updated along with the change of the state.

Here, on the detailed screen, since the character display of the state of the device 2a is also written as detailed information in the ladder symbol, the user can more accurately grasp the state of the device 2a corresponding to the ladder symbol. Further, since the address and the variable name (device name) are displayed as the detailed information, the installation location of the device 2a and the like can be grasped. For example, whether or not the device 2a has a malfunction when it goes to the installation location. Whether the device 2a is replaced or not can be taken. In addition to the address and the device name, the variable memory 27 may also store the installation location and a method for dealing with a defect, and the information may also be described as detailed information. In any case, the detailed information can accurately present the current state of the device 2a to the user and also can provide information for taking an appropriate response.

Further, for example, on the detail screen, the end button B
When the general screen display is instructed by pressing 1, etc. (S4
In case of YES), the control-HMI processing unit 41
Repeats the processing from S1. As a result, the schematic screen of the ladder monitor is displayed again as shown in FIGS. 4 and 5.

By the way, when an instruction to end the display of the ladder monitor is given, for example, by pressing the button B1 during the display of the outline screen, the HMI processing section 25 sets the area M1 of the ladder monitor variable to OFF and the control- HMI processing unit 4
1 instructs the HMI processing unit 25 to end the display of the ladder monitor screen. As a result, the HMI processing unit 25 again
Display the operation screen. It should be noted that the control-HMI processing unit 41 according to the present embodiment stores the operation screen that was displayed immediately before, for example, in the form of a screen number when the ladder monitor is activated, and at the end, the operation screen is displayed. The HMI processing unit 25 is instructed to restart the screen display.

In the above description, the case where the device 2a is associated with the area M1 of the ladder monitor variable has been described as an example. When the area M1 of the ladder monitor variable is associated with the storage area indicating the operation result of the button of, the programmable display 12 operates as follows.

That is, H of the programmable display 12
The MI processing unit 25, as shown in FIG.
When any three points among the four areas A11 to A14 at the four corners of the screen are pressed while the operation screen showing the state is displayed, the HMI processing unit 25 displays the menu based on the screen data. When it is determined that the instruction has been given, as shown in FIG. 10, a menu is displayed on a part (lower end in this example) of the operation screen A2. The menu includes a button B51 for switching menu items, a button B52 for instructing display of a ladder monitor screen, and other buttons B53 to
When B54 is displayed and button B52 is pressed,
The HMI processing unit 25 stores in the storage area of the internal memory of the programmable display 12 that the button B52 has been operated. Here, since the storage area is associated with the area M1 of the ladder monitor variable by the association of the variables, the content of the area M1 also becomes a value indicating activation by the above operation. As a result, the control-HMI processing unit 41 monitoring the contents of the area M1 activates the ladder monitor.

As another example of the association, when the area M1 is associated with the macro by the association of the variables, the HMI processing section 25 causes the area M1 to become ON when the operation result of the macro becomes a value indicating ON. Set the value of to ON. In this case, the control-HMI processing unit 41 that monitors the contents of the ladder monitor variable determines that the ladder monitor screen display trigger has occurred, and displays the ladder monitor screen as described above.

Here, the association of the ladder monitor variables can be changed by the drawing editor, the control program editor or the like as in the case of the variables related to the screen display, operation or control. Therefore, unlike the case where the trigger for starting the ladder monitor screen is fixed, the trigger for automatically starting the ladder monitor screen can be changed by the user of the control system 1 as necessary. Flexibility can be increased.

In addition, in the present embodiment, not only is the ladder monitor screen activated, but, for example, termination, scrolling, etc.
The operation on the ladder monitor screen is also associated with the ladder monitor variable, and the control-HMI processing unit 41
Controls the display of the ladder monitor screen according to the contents of these variables. Here, these variables are also in the device 2
a, a storage area of the programmable display 12, a macro, or the like. Therefore, the user can also set a trigger for automatically executing an operation on the ladder monitor screen. As a result, for example, the device 2a
When the status of is changed to a specific status, the flexibility of setting the automatic operation on the ladder monitor screen, such as displaying the part including the ladder symbol corresponding to the device 2a on the ladder monitor screen, is provided. Can be improved.

In the above, the programmable display 1
The case where the activation of the ladder monitor screen of No. 2 and the operation to the screen are controlled by the variable that can be associated with the storage area of the device 2a or the programmable display 12 or the calculation result of the macro has been described as an example. Even in the case of displaying / operating the ladder monitor screen on the control host computer 14, substantially the same effect can be obtained.

However, when the ladder monitor screen or the device monitor screen can be displayed on the programmable display 12 operated by the operator near the target system 2 (on site) as in the present embodiment, an abnormality occurs. In this case, the cause of the abnormality can be pursued by referring to these screens without bringing new equipment to the site.

Since the programmable display device 12 is installed in the field, the installation place is often limited, and it is often impossible to secure sufficient resolution and screen size. However, in the above-described configuration, the mutual relationship between the devices 2a and the state of each device 2a can be accurately grasped without lowering the visibility of the ladder monitor, as compared with the case where all are displayed in a reduced size. Great effect.

In each of the members 21 to 42, an arithmetic means such as a CPU executes a program stored in a storage means such as a ROM or a RAM, an input / output means such as a touch panel or a liquid crystal display device, or an interface. It is a functional block realized by controlling a communication circuit such as a circuit. Therefore, the computer having these means can read the recording medium (for example, a CD-ROM or the like) recording the program and execute the program to implement the programmable display 12 according to the present embodiment. Note that, for example, if a program for downloading the program through the serial cable, the LAN 13, or another communication path is installed in the computer in advance, the program is distributed to the computer through the communication path. You can also do it.

[0078]

As described above, the ladder monitor device according to the first aspect of the present invention displays, together with the ladder symbol, a detailed screen on which detailed information related to the ladder symbol is written, and part or all of the detailed information. By omitting it, the display control means is provided for switching and displaying the rough screen for roughly displaying more ladder symbols than the ladder symbols displayed on the detailed screen for the ladder monitor means for displaying the ladder monitor. Further, the program according to the invention of claim 4 and the program recorded on the recording medium according to the invention of claim 5 are:
A program that causes a computer to operate as each unit according to claim 1, and the computer that executes the program operates as the ladder monitor device according to claim 1.

In these configurations, since it is possible to switch the outline screen in which it is easy to grasp the mutual relationship of the devices and the detailed screen of the state of each device, it is possible to realize the mutual relationship of the devices without lowering the visibility of the ladder monitor. The effect is that the state of each device can be accurately grasped.

As described above, in the ladder monitor device according to the invention of claim 2, in the configuration of the invention of claim 1, when the ladder symbol displayed on the outline screen is selected, It is a configuration for displaying a detailed screen including the ladder symbol.

According to the above configuration, since the detailed screen including the ladder symbol selected on the schematic screen is displayed, it is possible to easily select the ladder symbol to be displayed together with all the detailed information.

As described above, the ladder monitor apparatus according to the third aspect of the present invention is, in the configuration of the first or second aspect of the invention, a control means for controlling the device in accordance with the control program, and a device for controlling each device. In addition to displaying the state of each device with a graphic of a display method according to the state, when an operation for the graphic is accepted, an operation means for instructing the control means to control the device according to the operation is provided. is there.

According to the above configuration, in the control system, the device provided with the essential means, that is, the control means as the control device and the operation means as the HMI,
It also works as a ladder monitor. Therefore, when an abnormality occurs, the abnormal device can be identified by the ladder monitor without bringing new equipment to the site. As a result, there is an effect that the time required to return to normal operation can be shortened.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a data structure of variables stored in a variable memory of the programmable display of the control system.

FIG. 3 shows a programmable display of the programmable display.
It is an explanatory view showing a control program executed by a logic controller function.

FIG. 4 is an explanatory diagram showing a screen example of a ladder monitor displayed on the programmable display.

FIG. 5 shows an example of a screen of the ladder monitor,
It is explanatory drawing which shows the case where the state of a device differs from FIG.

FIG. 6 is an explanatory diagram showing a data structure of a ladder monitor variable stored in the variable memory.

FIG. 7 is a flowchart showing the operation of the control system.

FIG. 8 is an explanatory diagram showing a detailed screen, which is an example of a screen of the programmable display.

FIG. 9 is an explanatory diagram showing an operation screen, which is an example of a screen of the programmable display device.

FIG. 10 is a screen example of the programmable display,
It is explanatory drawing which shows a menu.

[Explanation of symbols]

2a device 12 programmable display (ladder monitor device) 25 HMI processing unit (operating means) 33 device control unit (control means) 41 control-HMI processing unit (ladder monitor means; display control means)

Continued front page    F-term (reference) 5H220 BB10 CC03 CX06 CX08 DD04                       HH01 JJ12 JJ15 JJ19 JJ27                       JJ42 JJ53 KK08

Claims (5)

[Claims] 1. A ladder monitor apparatus having a ladder monitor means for displaying a control program for controlling a device as a ladder diagram and changing the display method of the ladder symbol according to the state of the device corresponding to the ladder symbol, A detailed screen in which detailed information related to the ladder symbol is written together with the ladder symbol, and a part or all of the detailed information is omitted, and more ladder symbols than the ladder symbols displayed on the detailed screen are roughly displayed. A ladder monitor device comprising display control means for switching and displaying a schematic screen on the ladder monitor means. 2. The ladder monitor device according to claim 1, wherein the display control means displays a detailed screen including the ladder symbol when the ladder symbol displayed on the schematic screen is selected. 3. A control means for controlling a device in accordance with the control program, and a graphic of a display method corresponding to the status of each device to display the status of each device and to accept an operation on the graphic. 3. The ladder monitor device according to claim 1, further comprising operation means for instructing the control means to control a device according to an operation. 4. A ladder monitor means for displaying a control program for controlling a device as a ladder diagram and changing the display method of the ladder symbol according to the state of the device corresponding to the ladder symbol, and with the ladder symbol, A detailed screen in which detailed information related to the ladder symbol is written together, and a schematic screen in which a part or all of the detailed information is omitted and more ladder symbols than the ladder symbols displayed in the detailed screen are schematically displayed. A program for operating a computer as display control means for switching and displaying on the ladder monitor means. 5. A recording medium on which the program according to claim 4 is recorded.