JP6051545B2 - PLC system, status display method, PLC, and programmable display - Google Patents

Description

  The present invention relates to a programmable controller (hereinafter referred to as “PLC”) system, a state display method, a PLC, and a programmable display, and in particular, a PLC system including a PLC capable of detecting an operation state of a device, a state The present invention relates to a display method, a PLC used in such a PLC system, and a programmable display.

  A PLC used as a control device for industrial equipment or the like includes a plurality of units such as a CPU unit that controls the entire PLC, a communication unit that performs communication, and an I / O unit that performs input and output of signals. In order for the user to design the control contents of the PLC such as how to design the user program in order to cause the PLC to execute the control desired by the user, predetermined software is installed in the personal computer (computer). However, it is common to use the installed software.

  A development support apparatus that supports the development of such a PLC is disclosed in, for example, “CX-Programmer Support Software Ver 9.0 Japanese Version (released in 2009) manufactured by OMRON Corporation” (Non-Patent Document 1).

OMRON CX-Programmer Support Software Ver 9.0 Japanese version (released in 2009)

  Here, using a development support apparatus as disclosed in Non-Patent Document 1, a PLC on which control contents are designed or the like is displayed on a programmable display (hereinafter, “ Display ”) is connected. Here, for example, a case where an abnormality of the device is displayed as the operation state of the device will be described. FIG. 8 is a flowchart showing the operation on the PLC side, and FIG. 9 is a flowchart showing the operation on the display side.

  First, in the PLC, there are stored a system program created by a manufacturer and stored in advance, and a user program created by a user and stored in the PLC to detect an abnormality occurring in the device. The user program is created according to the content of the abnormality to be detected. Specifically, the content of the abnormality detected by the user is determined, and a memory address is assigned to each abnormality. FIG. 10 is a diagram illustrating an example in which a memory address is assigned to each abnormality. Referring to FIG. 10, for example, in the case of a temperature abnormality, a memory address of W10.00 is allocated. In the case of a valve abnormality, a memory address of W100.08 is assigned.

  Then, a user program is created according to the memory address assignment shown in FIG. For example, a program for detecting that a predetermined signal has been interrupted from the I / O unit and a program for turning on an allocated memory address in accordance with the content of an abnormality such as interruption of the predetermined signal are created. Thereafter, the created user program is stored in the PLC.

  On the other hand, on the display side, a user program for displaying an abnormality name, which is character information indicating the content of the abnormality that has occurred in the device, is stored. This abnormality name is one that allows the user to recognize the contents of the abnormality at a glance. In this case, the user program is created so that the allocation of the memory address indicating the content of the abnormality detected on the PLC side shown in FIG. 10 corresponds to the abnormality name displayed on the display side. FIG. 11 is a diagram illustrating an example of an abnormal name displayed on the display side. Referring to FIG. 11, a temperature abnormality is generated as an abnormality name corresponding to the memory address of W10.00, and a valve abnormality is displayed as the abnormality name corresponding to the memory address of W100.08. Created. That is, with reference to FIG. 10 and FIG. 11, the contents of the abnormality correspond to the PLC side and the display side via the memory address.

  8 and 9, when the user program is executed on the PLC side, the user program detects that the valve signal is interrupted from the I / O unit (S101), and the signal of the valve is detected. In response to the abnormality of interruption, the memory address W100.08 assigned to the valve abnormality is turned from OFF to ON (S102). Then, the display side periodically monitors the memory address on the PLC side, and detects that the memory address W100.08 on the PLC side is turned on at a predetermined timing (S201). Then, the abnormality name “valve abnormality” corresponding to the memory address W100.08 is displayed on the display screen (S202). In this way, the abnormality detected on the PLC side is displayed on the display side.

  Therefore, conventionally, abnormality information is linked with the memory address on the PLC side and the display side. When an abnormality occurs in the device, the PLC side only turns on the memory address assigned to the abnormality. The specific abnormality name corresponding to the memory address is displayed on the display side.

  Here, for example, when the display device is connected to another PLC, the allocation of the memory address on the PLC side may not correspond to the abnormal name displayed on the display device side. FIG. 12 is a diagram schematically illustrating a case where the PLC side and the display side do not correspond. Referring to FIG. 12, if a display corresponding to the PLC of device A is connected to the PLC of device B, the abnormality cannot be correctly displayed. Specifically, even if the speed abnormality of the memory address W10.00 is turned on on the PLC side of the device B, a program for displaying the abnormality name corresponding to this memory address as a temperature abnormality is displayed on the display side. It has been created and cannot be displayed correctly. Therefore, the user needs to prepare each display device corresponding to each PLC, and such work is complicated.

  Further, conventionally, in the system program common to the entire PLC 12 created by the manufacturer of the PLC 12, the contents of the abnormality detected on the PLC side may be assigned as an abnormality code. FIG. 13 is a diagram illustrating an example in which an abnormality code is assigned to each abnormality. In this case, when an abnormality occurs on the PLC side, the abnormality code is stored in a predetermined memory area on the PLC side. On the other hand, on the display device side, a user program is created so that the assignment of the abnormality code indicating the content of the abnormality detected on the PLC side shown in FIG. 13 corresponds to the abnormality name displayed on the display device side. FIG. 14 is a diagram illustrating an example of an abnormal name displayed on the display side. Referring to FIG. 13 and FIG. 14, the contents of the abnormality correspond to the PLC side and the display side via the abnormality code. Therefore, on the display side, an abnormal code is acquired from a predetermined memory area on the PLC side, and an abnormal name corresponding to the acquired abnormal code is searched for and displayed on the display side.

  As described above, even when the contents of the abnormality are made to correspond on the PLC side and the display side via the abnormality code, for example, when the display is connected to another PLC, the abnormality code on the PLC side and the display are displayed. The abnormal name displayed on the device side does not correspond, and the user needs to prepare each display device corresponding to each PLC, and such work is complicated.

  Further, the user program on the PLC side and the user program on the display side are respectively stored by transferring data from the personal computer to the PLC and the display unit by the user. Therefore, if new abnormality information is to be added, it is necessary to add it to both the PLC and the display device, and such work is complicated for the user.

  An object of the present invention is to provide a PLC system, a state display method, a PLC, and a display device with improved operability.

  A PLC system according to the present invention includes a PLC that controls the operation of a device, and a programmable display connected to the PLC via a communication line. The PLC is information indicating the operation state of the device, and includes information storage means for storing information that can be directly recognized by the user, and information stored by the information storage means when a predetermined operation state of the device is detected. And corresponding information storage means for storing corresponding state information corresponding to a predetermined operation state in a predetermined storage unit. The programmable display includes a corresponding information acquisition unit that acquires the corresponding state information stored by the corresponding information storage unit, and a corresponding information display unit that displays the corresponding state information acquired by the corresponding information acquisition unit.

  In this way, information indicating the operation state of the device and stored as information that can be directly recognized by the user is stored on the PLC side, and when the predetermined operation state of the device is detected, the information is displayed as it is. Corresponding corresponding state information from the recognizable information is stored in a predetermined storage unit on the PLC side. On the display side, the corresponding state information is acquired from a predetermined storage unit stored on the PLC side and displayed. Therefore, it is not necessary to associate information indicating the operation state of the device between the PLC side and the display side, and the display side only displays the information that can be recognized as it is obtained from the predetermined storage unit on the PLC side. It's okay. Therefore, for example, even when the display device is to be connected to another PLC, the display device can display the information that can be recognized by the user as it is obtained from the predetermined storage unit on the PLC side. A display different from the operation state is not performed. Further, even when a new operation state is to be added by the user, it is only necessary to add it to the PLC side, so that troubles during maintenance can be saved, and user operation errors can be reduced. As a result, operability can be improved.

  Preferably, the PLC stores information that can be directly recognized by the user and an abnormal code corresponding to the information that can be directly recognized by the user, and the corresponding information storage unit stores information that can be directly recognized by the user. .

  On the other hand, the display unit sucks and stores the information stored in the information storage unit that can be directly recognized by the user and the abnormal code corresponding to the information that the user can recognize as it is. An abnormal code may be stored.

  The information that can be recognized as it is is preferably character information.

  Preferably, the PLC includes a detecting unit that detects a predetermined operating state of the device, and the predetermined operating state of the device detected by the detecting unit includes an abnormal state that occurs in the device. By doing so, it is possible to correctly display the abnormal state occurring in the device.

  More preferably, the PLC includes update means for updating information stored by the information storage means.

  In another aspect of the present invention, the present invention relates to a state display method for displaying an operation state of a device whose operation is controlled by a PLC on a programmable display connected to the PLC via a communication line. The state display method is a step of storing information indicating the operation state of the device in the PLC, which can be recognized by the user as it is, and when detecting a predetermined operation state of the device in the PLC, A step of storing the corresponding state information corresponding to the detected predetermined operation state in the predetermined storage unit from the stored information, and a step of acquiring the corresponding state information stored in the predetermined storage unit in the programmable display And a step of displaying the acquired corresponding state information in the programmable display.

  According to such a state display method, information indicating the operation state of the device, which can be directly recognized by the user, is stored on the PLC side, and the predetermined operation state of the device is detected. In this case, the relevant state information corresponding to the information that can be recognized as it is is stored in a predetermined storage unit on the PLC side. On the display side, the corresponding state information is acquired from a predetermined storage unit stored on the PLC side and displayed. Therefore, there is no need to associate information indicating the operation state of the device between the PLC side and the display side, and the display side displays the recognizable information acquired from the predetermined storage unit on the PLC side as it is. Only need. Therefore, for example, even when the display device is to be connected to another PLC, the display device can display the recognizable information acquired from the predetermined storage unit on the PLC side as it is. The display will not be different. Further, even when a new operation state is to be added by the user, it is only necessary to add it to the PLC side, so that troubles during maintenance can be saved, and user operation errors can be reduced. As a result, operability can be improved.

  Still another aspect of the present invention relates to a PLC that controls the operation of a device and is connected to a programmable display via a communication line. The PLC is information indicating the operation state of the device, and includes information storage means for storing information that can be directly recognized by the user, and information stored by the information storage means when a predetermined operation state of the device is detected. And corresponding information storage means for storing corresponding state information corresponding to a predetermined operation state in a predetermined storage unit.

  Such a PLC stores information indicating the operation state of the device on the PLC side, which can be recognized by the user as it is, and when a predetermined operation state of the device is detected, The corresponding state information that the user can recognize as it is is stored in a predetermined storage unit on the PLC side. And the information which a user can recognize as it is from the predetermined | prescribed storage part stored by the PLC side is acquired and displayed on the indicator side. Therefore, it is not necessary to associate information indicating the operation state of the device between the PLC side and the display side, and the corresponding state information that can be directly recognized by the user from the predetermined storage unit on the PLC side on the display side Is simply displayed. As a result, operability can be improved.

  Still another aspect of the present invention relates to a programmable display connected via a communication line to a PLC that controls the operation of a device. The programmable display is information indicating the operating state of the device, and among the information that the user can recognize as it is, the corresponding state information corresponding to the predetermined operating state of the device is acquired from the predetermined storage unit on the PLC side. Information acquisition means, and corresponding information display means for displaying the corresponding state information acquired by the corresponding information acquisition means.

  Such an indicator stores information indicating the operation state of the device on the PLC side, which can be recognized by the user as it is, and when a predetermined operation state of the device is detected, By storing the corresponding state information from the inside in the predetermined storage unit on the PLC side, the display unit obtains and displays the corresponding state information from the predetermined storage unit stored on the PLC side. Therefore, it is not necessary to associate information indicating the operation state of the device between the PLC side and the display side. On the display side, information that can be directly recognized by the user obtained from a predetermined storage unit on the PLC side is used as it is. It only needs to be displayed. As a result, operability can be improved.

  According to the present invention, on the PLC side, information indicating the operation state of the device, which can be recognized by the user as it is, is stored, and when a predetermined operation state of the device is detected, the information is Corresponding corresponding state information is stored in a predetermined storage unit on the PLC side. On the display side, the corresponding state information is acquired from a predetermined storage unit stored on the PLC side and displayed. Therefore, it is not necessary to associate information indicating the operation state of the device between the PLC side and the display side. On the display side, information that can be recognized by the user as it is from a predetermined storage unit on the PLC side is used as it is. It only needs to be displayed. Therefore, for example, even when the display device is to be connected to another PLC, the display device can display the status information that can be directly recognized by the user from the predetermined storage unit on the PLC side. There is no display different from the operation state intended by the side. Further, even when a new operation state is to be added by the user, it is only necessary to add it to the PLC side, so that troubles during maintenance can be saved, and user operation errors can be reduced. As a result, operability can be improved.

It is a block diagram which shows the structure of the PLC system which concerns on one Embodiment of this invention. It is a figure which shows a part of abnormality detection program. It is a figure which shows an example of the abnormality information memorize | stored in the memory of PLC. It is a flowchart shown about the operation | movement by the side of PLC. It is a flowchart shown about operation | movement by the side of a display. It is a figure which shows the state displayed on the display screen. It is a flowchart shown about the operation | movement by the side of PLC in the case of updating operation state information. It is a flowchart shown about the operation | movement by the side of the conventional PLC. It is a flowchart shown about operation | movement by the side of the conventional indicator. It is a figure which shows an example to which the memory address corresponding to each abnormality was allocated. It is a figure which shows an example of the memory address and character information which are memorize | stored on the indicator side. It is the figure which showed typically the case where it does not respond | correspond by the PLC side and the indicator side. It is a figure which shows an example which allocated the abnormal code | cord | chord with respect to each abnormality. It is a figure which shows an example of the abnormal name displayed on the indicator side.

  Hereinafter, a PLC system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a PLC system 10 according to an embodiment of the present invention. Referring to FIG. 1, a PLC system 10 includes a PLC 12 that controls the operation of the device 11, and a display 13 that is connected to the PLC 12 via a communication line.

  The display unit 13 includes a control unit 21 such as a CPU that controls the entire display unit 13, a storage unit 22 such as a memory that stores a user program created by a user using the PLC 12, and a display that displays screen data and the like. A screen 23 and an I / F (interface) unit 24 serving as an interface with an external device such as the PLC 12 are provided. The display 13 displays the operating state of the device 11. The storage unit 22 of the display 13 stores a user program including screen data for displaying the operation state of the device 11.

  The PLC 12 includes a plurality of various units such as a CPU unit 15 that controls the entire PLC 12, a communication unit 16 that communicates with an external device such as the device 11 and a personal computer (not shown), and an I / O unit that performs signal input and output. Includes units. The CPU unit 15 includes a control unit 15a such as a CPU that controls the entire CPU unit 15, and a memory 18 that stores a user program created by a user, data, and the like. The memory 18 includes an occurrence abnormality information storage area 18a which is a predetermined storage unit.

  When the power is turned on, the PLC 12 executes a system program common to the entire PLC 12 created by the manufacturer of the PLC 12, and then executes a user program stored in the memory 18. Then, by the execution of the user program, the operation of the device 11 is controlled as desired by the user. The system program and user program are executed cyclically.

  Here, the memory 18 of the PLC 12 stores a user program for detecting the operating state of the device 11. In this embodiment, a user program for detecting an abnormality that has occurred in the device 11 is stored.

  Here, the user program is created by the user in accordance with the content of the abnormality requested by the user and desired to be detected. Specifically, first, the user determines the content of the abnormality to be detected. For example, it is determined that a valve abnormality is detected. At this time, an abnormality code 400 corresponding to the valve abnormality is assigned. When the content of the abnormality to be detected is determined, a determination program that determines whether or not an abnormality occurrence condition that makes it possible to determine that an abnormality has occurred, or an abnormality that corresponds to the abnormality when the abnormality occurrence condition is satisfied An abnormality detection program for setting a code is created as a user program.

  The determination program is, for example, a program that determines whether or not a predetermined sensor has been turned on after a predetermined time has elapsed since turning on an operation command for a predetermined actuator in the case of a valve abnormality. The abnormality detection program is a program that operates according to the determination program. For example, this is a program for setting an abnormality code corresponding to a valve abnormality when the abnormality occurrence condition of the valve abnormality is satisfied in the determination program, that is, when a predetermined sensor is not turned ON. An example of a ladder program in which an abnormality code (for example, 400) corresponding to a valve abnormality is set is shown in FIG.

  In addition, the memory 18 of the PLC 12 stores information that indicates the operating state of the device 11 and that can be directly recognized by the user. Here, the memory 18 operates as information storage means. Here, the recognizable information is information that allows the user to recognize the content as it is, and is different from numerical information such as a code, for example, character information. Here, the recognizable information includes not only character information but also image information, audio information, a program desired to be operated on the display side, and the like.

  Next, an example of information represented by character information will be described. In this embodiment, as the operation state of the device 11, abnormality information determined by the user and indicating the content of the abnormality of the device 11 to be detected is stored. FIG. 3 is a diagram illustrating an example of abnormality information stored in the memory 18 of the PLC 12. Referring to FIG. 3, the abnormality code and the abnormality name are stored so as to correspond to each other. Here, the abnormal code is a number indicating the content of the detected abnormality, and the abnormal name is the character information that allows the user to recognize the abnormal content of the abnormal code at a glance, It is information of characters different from numbers. For example, when the user determines to detect a valve abnormality as the content of the abnormality, the abnormality code “400” indicating the valve abnormality and the abnormality name “valve abnormality” corresponding to the abnormality code “400” are stored. Is done.

  The user program on the PLC 12 side and the user program on the display unit 13 side are created by the user using the support software installed on the personal computer, and are transferred from the personal computer to the PLC 12 or the display unit 13 after the creation. And stored in the memory 18 or the storage unit 22.

  Here, a case where the PLC 12 detects a predetermined operation state of the device 11 and the display device 13 displays corresponding state information corresponding to the predetermined operation state on the display screen 23 will be described. In this embodiment, an abnormal state is adopted as the predetermined operation state of the device 11, the PLC 12 detects the abnormal state of the device 11, and the display 13 displays relevant abnormality information corresponding to the abnormal state on the display screen 23. The case of displaying on the screen will be described. FIG. 4 is a flowchart showing the operation on the PLC 12 side, and FIG. 5 is a flowchart showing the operation on the display unit 13 side. A description will be given with reference to FIGS.

  First, on the PLC 12 side, the control unit 15a executes the user program after executing the system program. Here, as the user program, a determination program is first executed. The determination program determines that the predetermined sensor is not turned ON even if a predetermined time has elapsed after the operation command of the predetermined actuator is turned ON. That is, it is determined that the abnormality occurrence condition of the valve abnormality is satisfied (in FIG. 4, step S11, the following steps are omitted).

  Then, the abnormality detection program is executed. The abnormality detection program sets an abnormality code corresponding to the valve abnormality (S12). As the abnormality detection program, for example, an instruction “SETALARM” is used, and an abnormality code “400” of valve abnormality is set as a parameter of the instruction. Here, the CPU unit 15 operates as detection means.

  Then, the control unit 15a recognizes that the abnormality code “400” is set, and the abnormality name “valve abnormality” corresponding to the abnormality code “400” of the valve abnormality from the abnormality information list shown in FIG. Is stored in the occurrence abnormality information storage area 18a (S13). That is, the abnormality name is corresponding state character information corresponding to the detected abnormality. Here, the CPU unit 15 operates as corresponding information storage means.

  On the display unit 13 side, the occurrence abnormality information storage area 18a on the PLC 12 side is periodically monitored based on the user program, and the corresponding state character information stored in the occurrence abnormality information storage area 18a is displayed at a predetermined timing. Read (S21 in FIG. 5). Here, the control unit 21 operates as corresponding information acquisition means. And the control part 21 displays "valve abnormality" which is the read applicable state character information on the display screen 23 as it is (S22). Here, the control unit 21 operates as corresponding information display means. FIG. 6 is a diagram showing a state displayed on the display screen 23. Referring to FIG. 6, display 13 displays “valve abnormality” in alarm display area 23a, for example.

  Thus, in the PLC system 10 according to the present invention, the PLC 12 side stores information indicating the operating state of the device 11, which is character information that can be recognized by the user, and sets the predetermined operating state of the device 11. When detected, the corresponding state character information from the character information is stored in the occurrence abnormality information storage area 18a which is a predetermined storage unit on the PLC 12 side. On the display unit 13 side, the corresponding state character information is acquired from the occurrence abnormality information storage area 18a stored on the PLC 12 side and displayed. Therefore, it is not necessary to associate the character information indicating the operation state of the device 11 between the PLC 12 side and the display unit 13 side. On the display unit 13 side, the corresponding state character acquired from the occurrence abnormality information storage area 18a on the PLC 12 side. It is only necessary to display the information as it is. Therefore, for example, even when the display device 13 is to be connected to another PLC, the display device 13 can display the corresponding state character information obtained from the predetermined storage unit on the other PLC side as it is. There is no display different from the intended operation state. Further, even when a new operation state is to be added by the user, it is only necessary to add it to the PLC side, so that troubles during maintenance can be saved, and user operation errors can be reduced. As a result, operability can be improved.

  In addition, unlike the prior art, it is not necessary to correspond the memory address and error code between the PLC side and the display side, so that only one display unit can be used to detect errors in multiple units that incorporate multiple PLCs. It can be switched and displayed.

Next, another embodiment of the present invention will be described. In this embodiment, the PLC 12 stores an event code that uniquely indicates its operation state and contents corresponding to the event code, while the display unit 13 also stores all of these contents in advance.
Suck from LC and store. Then, the PLC 12 stores only the event code in the occurrence abnormality information storage area 18a , and the display unit 13 reads the event code in the occurrence abnormality information storage area 18a and displays the corresponding content held by itself.

  Moreover, as the timing of the siphoning, it may be sifted when the abnormality of the device 11 is first detected as described above, or may be sifted and acquired at an arbitrary timing. For example, when the PLC 12 is assembled, the PLC 12 may be attached to the device 11 and the PLC 12 may be connected to the display 13 for the first time. In this case, for example, when it is determined that the abnormality occurrence condition of the valve abnormality is satisfied and an abnormality code corresponding to the valve abnormality is set, the abnormality code “400” is stored in the occurrence abnormality information storage area 18a. Then, the display device 13 reads the abnormality code “400” from the occurrence abnormality information storage area 18a, and refers to the abnormality information acquired in advance, thereby indicating the abnormality name “valve abnormality” corresponding to the abnormality code “400”. It is displayed on the display screen 23.

  In the above embodiment, the abnormality information shown in FIG. 3 has been described with respect to the example including the abnormality code and the abnormality name. However, the present invention is not limited to this, and includes the importance level of the abnormality and the group to which the abnormality belongs. In other words, such information may be stored in the occurrence abnormality information storage area 18a and displayed on the display screen 23 together with the abnormality name.

  In the above embodiment, the example in which the “SETALARM” command is used as the user program in S12 has been described. However, the parameter of the “SETALARM” command includes predetermined information such as a measured temperature value. The predetermined information may be stored in the occurrence abnormality information storage area 18a and controlled to be displayed on the display screen 23.

  In the above-described embodiment, the example in which the abnormal state is adopted as the predetermined operation state of the device 11 has been described. However, the present invention is not limited to this, and other states other than the abnormality, such as a normal operation state. It can also be applied to. In this case, in the memory 18 of the PLC 12, a user program for detecting each state of the device 11 is created and stored by the user, and a list of information on each operation state (including the operation state) is stored.

  In the above embodiment, the example in which the operation state information shown in FIG. 3 is stored in advance in the memory 18 of the PLC 12 by the user is described. However, the present invention is not limited to this, and the configuration can be updated by the user. It may be.

  An example of processing in this case will be described. First, a personal computer is connected to the PLC 12 (S31 in FIG. 7). Then, the support software is activated on the personal computer. Then, the character information is updated by the user using the support software, and the updated character information is transferred to the PLC 32 (S32). On the PLC 12 side, the transferred data is stored in the memory 18. Here, the control unit 15a operates as an updating unit.

  In this way, even when the operation state of the device 11 is added, the operation state information stored on the PLC 12 side can be arbitrarily updated on the user side using support software or the like. . As a result, operability can be improved.

  In the above-described embodiment, the case where the update is performed in addition to the operation state information of the device 11 stored from the beginning in the memory 18 has been described. You may make it update with respect to all or one part of the stored operation state.

  Further, for example, processing such as updating all the operation state information written in Japanese to English may be performed.

  In the above embodiment, the PLC 13 reads the abnormality name “valve abnormality” corresponding to the abnormality code “400” of the valve abnormality in the occurrence abnormality information storage area 18a on the PLC 12 side. Although the example of displaying “valve abnormality” as corresponding state character information as it is on the display screen 23 has been described, on the PLC 12 side, in addition to the abnormality name “valve abnormality”, the abnormality code “400” is added to the occurrence abnormality information. By storing the data in the storage area 18a, the display device 13 may display the “valve abnormality” and the abnormality code “400”, which are the read state character information.

  Further, in the above embodiment, the case of the abnormal code and the abnormal name in the abnormal process in the user program has been described as an example. However, the present invention is not limited to this, and may be applied to other processes, You may apply to the process in a program.

  In addition, an intelligent unit may be connected separately so that the intelligent unit automatically detects a place to be maintained and automatically writes it in the memory of the PLC or the display.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is effectively used when displaying PLC operation information.

10 PLC system, 11 equipment, 12 PLC, 13 display, 14 personal computer,
15 CPU unit, 15a control unit, 16 communication unit, 18 memory, 18a
Occurrence abnormality information storage area, 21 control section, 22 storage section, 23 display screen, 23a alarm display area, 24 I / F section.

Claims (9)

A PLC system comprising a PLC that controls the operation of an externally provided device, and a programmable display connected to the PLC via a communication line,
The PLC is
Information storage means for storing information that indicates the operating state of the externally provided device and that can be directly recognized by the user;
When a predetermined operation state of the externally provided device is detected, the corresponding state information corresponding to the predetermined operation state is stored in a predetermined storage unit from the information stored by the information storage unit Corresponding information storage means,
The programmable display is
Corresponding information acquisition means for acquiring the corresponding state information stored by the corresponding information storage means;
And a corresponding information display unit that displays the corresponding state information acquired by the corresponding information acquisition unit. The PLC stores information that can be directly recognized by the user and an abnormal code corresponding to the information that can be directly recognized by the user,
The PLC system according to claim 1, wherein the corresponding information storage unit stores information that can be directly recognized by the user. The display unit sucks and stores information stored in the information storage unit that can be directly recognized by the user and an abnormality code corresponding to the information that can be directly recognized by the user from the PLC.
The PLC system according to claim 1, wherein the corresponding information storage unit stores the abnormality code as the corresponding state information . The PLC system according to claim 1, wherein the information that can be directly recognized by the user is character information. The PLC includes a detection unit that detects a predetermined operation state of the device, and the predetermined operation state of the device detected by the detection unit includes an abnormal state that occurs in the device.
The PLC system according to any one of claims 1 to 4. The PLC system according to claim 1, wherein the PLC includes an updating unit that updates the information stored by the information storage unit. A state display method for displaying an operation state of an externally provided device whose operation is controlled by a PLC on a programmable display connected to the PLC via a communication line,
In the PLC, storing information that indicates an operating state of an externally provided device and that can be directly recognized by the user;
In the PLC, when a predetermined operation state of an externally provided device is detected, the corresponding state information corresponding to the detected predetermined operation state is stored in a predetermined storage unit from the stored information;
In the programmable display, obtaining the corresponding state information stored in a predetermined storage unit;
In the programmable display, including the step of displaying the acquired corresponding state information,
Status display method. A PLC that controls the operation of an externally provided device and is connected to a programmable display via a communication line,
Information storage means for storing information that indicates the operating state of the externally provided device and that can be directly recognized by the user;
When a predetermined operation state of the externally provided device is detected, the corresponding state information corresponding to the predetermined operation state is stored in a predetermined storage unit from the information stored by the information storage unit PLC including the corresponding information storage means. A programmable display connected via a communication line to a PLC that controls the operation of an externally provided device,
Is information indicating an operation state of the equipment provided in the outside of the user as it is recognizable information, the relevant state information corresponding to predetermined operating state of the apparatus provided outside the PLC of the predetermined Appropriate information acquisition means acquired from the storage unit;
And a corresponding information display unit that displays the corresponding state information acquired by the corresponding information acquisition unit.

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