JP6996887B2 - Programmable logic controller system and data acquisition device - Google Patents

Description

The present invention relates to a programmable logic controller and a data acquisition device.

A programmable logic controller (hereinafter referred to as PLC) is a sequence control device widely used in an FA (Factory Automation) control system, and operates according to a user program such as a ladder program. The operator connects input devices such as limit switches, sensors, and thermometers, and output devices such as electromagnetic switches, solenoids, motors, actuators, cylinders, relays, and positioning systems to the PLC, and uses a ladder program to connect these. Controls the controlled device. The operator creates a ladder program on a program creation support device such as a personal computer (hereinafter referred to as a PC), connects the PC and the PLC, and stores the ladder program in the storage unit of the PLC. Various data such as device information is also stored in the storage unit of the PLC. The device information is information indicating the input state from the input device, the output state to the output device, and the state of the internal relay (auxiliary relay), timer, counter, data memory, etc. set on the ladder program. The device is a name indicating an area on the memory provided for storing device information. By connecting the program creation support device to the PLC, the device information (device value) held by the PLC can be displayed on the program creation support device and visually recognized. PLC is generally composed of a basic unit (CPU unit) and an expansion unit. The CPU unit and the expansion unit exchange device values with each other through refreshes performed at each scan cycle through pre-allocated devices.

By the way, in order to stably produce a work in the work (parts) production process, predictive maintenance of the production process is required. This is because there are parts of the manufacturing machine used in the production process that require maintenance. According to Patent Document 1, it is proposed that an industrial machine transfers data to the cloud according to a predetermined template, and the cloud analyzes the data.

U.S. Pat. No. 9,128,472

According to Patent Document 1, a template prepared in advance is required. In other words, if there is no template that meets the needs of the user, the user has to create the template by himself, which is troublesome. Further, in the above-mentioned predictive maintenance, it is necessary to examine individual data corresponding to individual parts from the time series data. However, since the time-series data of device values is enormous, it is difficult to extract the individual data required by the user.

Therefore, it is an object of the present invention to make it easy for the user to extract individual data from the time series data.

The present invention is, for example,
A programmable logic controller system that controls the operation of controlled devices by repeatedly executing user programs.
A program storage unit that stores the user program and
A device storage unit that can be specified on the user program and holds a plurality of devices including a bit device that stores one bit of information and a word device that stores one word or several words of information.
A program execution unit that repeatedly executes a user program stored in the program storage unit and performs arithmetic processing on information stored in the plurality of devices according to the user program.
By repeatedly collecting device data stored in at least one device among the devices held in the device storage unit, time-series device data having periodicity corresponding to the repeated operation of the controlled device is formed. Data collection department and
By analyzing the user program, an instruction loop in which a plurality of instructions are repeatedly executed according to the rise or fall of the execution trigger is identified, and based on the specified instruction loop, the cycle is obtained from the time-series device data. A decision unit that determines the execution trigger that serves as a reference for determining an extraction period for extracting a plurality of individual data according to gender .
An extraction unit that extracts a plurality of individual data according to the periodicity from the time-series device data based on the timing at which the execution trigger determined by the determination unit changes.
Provided is a programmable logic controller system characterized by having an addition unit for assigning identification information for identifying each individual data to each individual data extracted by the extraction unit.

According to the present invention, it becomes easy for the user to extract individual data from the time series data.

Diagram showing a PLC system Diagram illustrating the ladder program Diagram explaining the program creation support device Diagram illustrating PLC Diagram illustrating a scan of a ladder program Diagram illustrating IPC Diagram explaining the cloud Diagram explaining time series data and extraction period The figure explaining the method of determining the extraction period The figure explaining the method of determining the extraction period The figure explaining the method of determining the extraction period The figure explaining the method of determining the extraction period The figure explaining the method of determining the extraction period Diagram illustrating features related to determining the extraction period Diagram illustrating features related to data collection and extraction Diagram illustrating features related to data collection and extraction Diagram illustrating features related to data collection and extraction Flowchart explaining the process of determining the extraction period Flow chart explaining the collection process Diagram explaining time series data Flow chart explaining the extraction process Diagram explaining individual data Flowchart explaining integrated collection process and extraction process A diagram illustrating a UI that displays individual data A diagram illustrating a UI that displays individual data A diagram illustrating a UI that displays individual data Sequence diagram for sending and receiving individual data Sequence diagram for sending and receiving individual data Sequence diagram for sending and receiving individual data Sequence diagram for sending and receiving individual data The figure which shows the display example of individual data

<System configuration>
First, a general PLC configuration and its operation will be described so that a person skilled in the art can better understand a programmable logic controller (PLC, which may be simply referred to as a programmable controller).

FIG. 1 is a conceptual diagram showing a configuration example of a programmable logic controller system according to an embodiment of the present invention. As shown in FIG. 1, this system is a PLC (programmable) for comprehensively controlling a program creation support device 2 for editing a user program such as a ladder program and various control devices installed in factories and the like. -It is equipped with a logic controller) 1. The user program may be created using a graphical programming language such as a ladder language or a flow chart-type motion program, or may be created using a high-level programming language such as C language. In the following, for convenience of explanation, the user program will be a ladder program. The PLC 1 includes a basic unit 3 having a built-in CPU and one or more expansion units 4. One or more expansion units 4 can be attached to and detached from the basic unit 3. The basic unit 3 is sometimes called a CPU unit.

The basic unit 3 is provided with a display unit 5 and an operation unit 6. The display unit 5 can display the operating status of each expansion unit 4 attached to the basic unit 3. The display unit 5 switches the display content according to the operation content of the operation unit 6. The display unit 5 usually displays the current value (device value) of the device in PLC1, error information generated in PLC1, and the like. The device is a name indicating an area on a memory provided for storing a device value (device data), and may be referred to as a device memory. The device value is information indicating the input state from the input device, the output state to the output device, and the state of the internal relay (auxiliary relay), timer, counter, data memory, etc. set on the user program. There are two types of device values: bit type and word type. The bit device stores a 1-bit device value. The word device stores the device value of one word.

The expansion unit 4 is prepared to expand the function of the PLC1. A field device (controlled device) 10 corresponding to the function of the expansion unit 4 is connected to each expansion unit 4, whereby each field device 10 is connected to the basic unit 3 via the expansion unit 4. The field device 10 includes an input device such as a sensor and an output device such as an actuator. When it is necessary to identify a plurality of field devices 10, characters a, b, c ... Are added to the end of the reference code, such as 10a and 10b.

The program creation support device 2 is, for example, a portable notebook type or tablet type personal computer, and includes a display unit 7 and an operation unit 8. The ladder program, which is an example of the user program for controlling the PLC 1, is created by using the program creation support device 2. The created ladder program is converted into a mnemonic code in the program creation support device 2. The program creation support device 2 is connected to the basic unit 3 of the PLC1 via a communication cable 9 such as USB (Universal Serial Bus), and sends a ladder program converted into a mnemonic code to the basic unit 3. The basic unit 3 converts the ladder program into machine code and stores it in the memory provided in the basic unit 3. Although the mnemonic code is transmitted to the basic unit 3 here, the present invention is not limited to this. For example, the program creation support device 2 may convert the mnemonic code into an intermediate code and transmit the intermediate code to the basic unit 3.

Although not shown in FIG. 1, the operation unit 8 of the program creation support device 2 may include a pointing device such as a mouse connected to the program creation support device 2. Further, the program creation support device 2 may be configured to be detachably connected to the basic unit 3 of the PLC 1 via a communication cable 9 other than USB. Further, the configuration may be such that the basic unit 3 of the PLC 1 is wirelessly connected without the communication cable 9.

IPC11 is a data collection device that collects time series data from PLC1. The IPC 11 may transmit the time series data to the cloud 12. The cloud is a collection of server devices that store data and execute predetermined processing on the data.

<Ladder program>
FIG. 2 is a diagram showing an example of the ladder diagram Ld displayed on the display unit 7 of the program creation support device 2 when the ladder program is created. The program creation support device 2 displays a plurality of cells arranged in a matrix on the display unit 7. A virtual device symbol is placed in each cell. Symbols indicate input relays, output relays, and the like. A relay circuit is formed by a plurality of symbols. In the ladder diagram Ld, for example, cells of 10 columns × N rows (N is an arbitrary natural number) are arranged. Then, the symbol of the virtual device is appropriately arranged in the cell of each row.

The relay circuit shown in FIG. 2 is used to control the symbols of three virtual devices (hereinafter referred to as “input devices”) that are turned on / off based on the input signal from the input device and the operation of the output device. It is configured by appropriately combining the symbols of virtual devices (hereinafter referred to as "output devices") that are turned on / off.

The characters (“R0001”, “R0002”, and “R0003”) displayed above the symbol of each input device represent the device name (address name) of the input device. The characters (“flag 1”, “flag 2”, and “flag 3”) displayed below the symbol of each input device represent the device comment associated with that input device. The character displayed above the symbol of the output device (“return to origin”) is a label consisting of a character string representing the function of the output device.

In the example shown in FIG. 2, the AND circuit is configured by connecting the symbols of the two input devices corresponding to the device names “R0001” and “R0002” in series. Further, the OR circuit is configured by connecting the symbols of the input devices corresponding to the device name "R0003" in parallel to the AND circuit composed of the symbols of these two input devices. That is, this relay circuit corresponds to the symbol of the first line only when both the input devices corresponding to the two symbols in the first line are turned on, or when the input device corresponding to the symbol of the second line is turned on. The output device to turn on.

<Program creation support device>
FIG. 3 is a block diagram for explaining the electrical configuration of the program creation support device 2. As shown in FIG. 3, the program creation support device 2 includes a CPU 21, a display unit 7, an operation unit 8, a storage device 22, and a communication unit 23. The display unit 7, the operation unit 8, the storage device 22, and the communication unit 23 are each electrically connected to the CPU 21. The storage device 22 includes at least a RAM, and includes a program storage unit 24 and an editing software storage unit 25.

The user causes the CPU 21 to execute the editing software stored in the editing software storage unit 25, and edits the ladder program through the operation unit 8. Here, editing the ladder program includes creating and modifying the ladder program. The ladder program created by using the editing software is stored in the program storage unit 24. Further, the user can read the ladder program stored in the program storage unit 24 as needed and change the ladder program by using the editing software. The communication unit 23 is for connecting the program creation support device 2 to the basic unit 3 so as to be communicable via the communication cable 9.

<PLC>
FIG. 4 is a block diagram for explaining the electrical configuration of PLC1. As shown in FIG. 4, the basic unit 3 includes a CPU 31, a display unit 5, an operation unit 6, a storage device 32, and a communication unit 33. The display unit 5, the operation unit 6, the storage device 32, and the communication unit 33 are each electrically connected to the CPU 31. The storage device 32 may include a RAM, a ROM, a memory card, and the like. The storage device 32 has a plurality of storage areas such as a device unit 34 and a program storage unit 35. The device unit 34 has a bit device, a word device, and the like, and each device stores a device value. The program storage unit 35 stores the ladder program and user data input from the program creation support device 2. The program storage unit 35 also stores the control program for the basic unit 3. As shown in FIG. 4, the basic unit 3 and the expansion unit 4 are connected to each other via a unit external bus 90, which is a kind of expansion bus. The communication function related to the unit external bus 90 may be implemented as a part of the communication unit 33.

FIG. 5 is a schematic diagram showing the scan time of the basic unit 3. As shown in FIG. 5, one scan time T is composed of inter-unit communication 201 for input / output refresh, program execution 202, and END process 204. In the inter-unit communication 201, the basic unit 3 transmits the output data obtained by executing the ladder program from the storage device 32 in the basic unit 3 to an external device such as the expansion unit 4. Further, the basic unit 3 takes in the input data received from an external device such as the expansion unit 4 into the storage device 32 in the basic unit 3. That is, the device value stored in the device of the basic unit 3 is reflected in the device of the expansion unit 4 by the output refresh. Similarly, the device value stored in the device of the expansion unit 4 is reflected in the device of the basic unit 3 by the input refresh. In this way, the device of the basic unit 3 and the device of the expansion unit 4 are synchronized by the input / output refresh. A mechanism for updating the device value between units at a timing other than refreshing may be adopted. However, the device of the basic unit 3 is rewritten by the basic unit 3 at any time, and similarly, the device of the expansion unit 4 is rewritten by the expansion unit 4 at any time. That is, the device of the basic unit 3 can be accessed at any time by the device inside the basic unit 3. Similarly, the device of the expansion unit 4 is made accessible at any time by the device inside the expansion unit 4. The basic unit 3 and the expansion unit 4 basically update their device values and synchronize with each other at the refresh timing. In the program execution 202, the basic unit 3 executes (calculates) the program using the updated input data. The basic unit 3 processes data by executing a program. The END process means all processes related to peripheral services such as data communication with external devices such as a display (not shown) connected to the program creation support device 2 and the basic unit 3, and system error check. .. The IPC 11 may collect time series data from the PLC 1 in the END process 204.

In this way, the program creation support device 2 creates a ladder program according to the user's operation, and transfers the created ladder program to PLC1. The PLC1 sets input / output refresh, execution of the ladder program, and END processing as one cycle (one scan), and repeatedly executes this cycle periodically, that is, cyclically. As a result, various output devices (motors, etc.) are controlled based on timing signals from various input devices (sensors, etc.). Therefore, the PLC1 behaves completely differently from a general-purpose personal computer (PC).

<Data collection device>
FIG. 6 is a block diagram for explaining the electrical configuration of the IPC 11. The IPC 11 includes a CPU 51, a storage device 52, a communication unit 53, a display unit 57, an operation unit 58, and the like. The storage device 52, the communication unit 53, the display unit 57, and the operation unit 58 are electrically connected to the CPU 51 via an internal bus or the like. The storage device 52 may include a RAM, a ROM, a memory card, a hard disk drive (HDD), a solid state drive (SSD), and the like. The storage device 52 is provided with a time-series data storage unit 54 for storing time-series storage data collected from the PLC 1 and a program storage unit 55 for storing a control program executed by the CPU 51. The IPC 11 communicates with the PLC 1 and the cloud 12 via the communication unit 53. For example, the CPU 51 collects time-series data, which is a device value or an aggregate thereof, from the PLC1 via the communication unit 53 and stores it in the time-series data storage unit 54. Further, the CPU 51 may read the time-series data from the time-series data storage unit 54 and transmit the time-series data to the cloud 12 via the communication unit 53.

<Cloud>
FIG. 7 is a block diagram for explaining the electrical configuration of the cloud 12. The cloud 12 includes a CPU 61, a storage device 62, a communication unit 63, a display unit 67, and an operation unit 68. The storage device 62, the communication unit 63, the display unit 67, and the operation unit 68 are each electrically connected to the CPU 61 via an internal bus or the like. The storage device 62 may include a RAM, a ROM, a memory card, a hard disk drive (HDD), a solid state drive (SSD), and the like. The storage device 62 is provided with a time-series data storage unit 64 for storing time-series storage data collected from the PLC 1 via the IPC 11 and a program storage unit 65 for storing a control program executed by the CPU 61. The cloud 12 communicates with the PLC 1, the IPC 11, and a client (eg, the program creation support device 2) via the communication unit 63. For example, the CPU 61 collects time-series data from the PLC 1 or the IPC 11 via the communication unit 63 and stores the time-series data in the time-series data storage unit 64. Further, the CPU 61 may perform an operation on the time series data and transmit it to the client via the communication unit 63.

<Extraction period>
PLC1 may be used to control the machining of a part or inspect a finished part in a factory line that manufactures a part. For example, PLC1 may apply pressure to a component to cut it or heat the component according to a user program. Further, the PLC 1 may control the XY stage connected to the expansion unit 4 to move the position of the component. In any case, it is necessary to collect and analyze the device values of PLC1 in order to find out the cause when a problem occurs or is likely to occur in the machining accuracy of the part. Device values change from moment to moment. For example, it may change hundreds of times in the processing and inspection of one part. This means that hundreds of ladder programs are scanned for each part. Further, when the collection period of time-series data becomes long, it is not easy for the user to visually confirm and find out which part of the time-series data corresponds to which component. Therefore, in this embodiment, the PLC 1, the IPC 11, or the cloud 12 extracts individual data for each component, thereby reducing the burden on the user. The user confirms the individual data through a client such as the program creation support device 2.

FIG. 8 is a diagram showing time-series data of device values. Here, four device values 91a to 91d are exemplified, but one or more device values may be present. The extraction period is information indicating the temporal position of individual data in the time series data. The extraction period is defined by the start position (start time) ts and the end position (end time) te of the individual data. Further, the extraction period may be defined by the temporal length P of the extraction period and the reference time tr. The length P may be referred to as the phase period. The reference time tr may be referred to as a reference phase. The length P of the extraction period is the time length from the start position ts to the end position te. The reference time tr indicates any position (time) from the start position ts to the end position te. For example, the start position ts may be defined as a time obtained by subtracting Δoffset1 from the reference time tr. The end position te may be defined as a time obtained by adding Δoffset2 from the reference time tr. Δoffset1 may be 0 and Δoffset2 may be P. That is, the end position te may be defined as the time obtained by adding the length P from the start position ts. FIG. 8 shows an example in which the reference time tr coincides with the start position ts. Although the horizontal axis shows time in FIG. 8, it may be the number of scans or the number of device value collections (sampling number). The time length of one scan is not always constant.

In FIG. 8, the device value 91a shows the coordinate change of the X axis of the XY stage which is a field device. The device value 91b indicates the coordinate change of the Y axis of the XY stage. The device value 91c indicates a request relay. The request relay is a relay in which the basic unit 3 instructs the expansion unit 4 to start executing a predetermined process. The device value 91d indicates a completion relay. The completion relay is a relay in which the expansion unit 4 notifies the basic unit 3 that a predetermined process has been completed.

As shown in FIG. 8, the individual data for each component has periodicity. This periodicity is due to the periodicity of iterative processing in the user program. Therefore, the CPU 21 may analyze the user program to specify the periodicity, and the CPU 21, 31, 51, 61 and the like may extract individual data according to this periodicity.

● Method for determining the extraction period based on the function block of the ladder program FIG. 9 shows the ladder program 36a including the function block 301. The function block 301 is executed many times while the CPU 31 is executing the ladder program 36a. Therefore, when the CPU 21 of the program creation support device 2 analyzes the ladder program 36a and finds the function block 301, the period of the function block 301 is determined in the extraction period. For example, the execution trigger of the function block 301 may be an EN signal. That is, the rising edge of the EN signal corresponds to the start position ts of the extraction period. Further, the function block 301 ends when the complete relay, which is a completion relay, starts up. That is, the rising edge of the completion relay corresponds to the end position te of the extraction period. Therefore, the CPU 21 creates setting information indicating that the extraction period is from the rise of the EN signal to the rise of the completion relay, and transfers the setting information to the PLC 1, the IPC 11, or the cloud 12.

● Method for determining the extraction period based on the repetition of instructions in the ladder program FIG. 10 shows the ladder program 36b including the repetition of instructions. According to the ladder program 36b, R1000, R1001, R1002, and R1003 are devices showing different states. STG and JMP are instructions for indicating that the ladder program 36b has a state transition. In this example, a particular instruction is repeatedly executed while R1001 is on. In particular, if R002 is on, the line of R1001 is repeatedly executed. When R003 is turned on, this repeating loop ends. Therefore, the timing at which R1001 switches from off to on corresponds to the start position ts of the extraction period. Further, the timing at which R1001 is switched from on to off corresponds to the end position te of the extraction period. The CPU 21 creates setting information indicating that the extraction period is from the timing at which R1001 is switched from off to on to the timing at which R1001 is switched from on to off, and transfers the setting information to the PLC1, IPC11, or cloud 12.

● Method for determining extraction period based on repetition of instructions in a flow chart-type motion program FIG. 11 shows a flowchart-type motion program 320. The flow chart type motion program 320 is a user program for controlling a positioning motion unit such as an XY stage. As shown in FIG. 11, when the relay device R100 is not on, the positioning control is repeatedly executed. That is, the positioning control is repeatedly executed while R100 is off. Therefore, the CPU 21 creates setting information indicating that the period during which R100 is off is the extraction period, and transfers the setting information to the PLC1, the IPC11, or the cloud 12.

● Method for determining the extraction period based on the analysis of the point parameters included in the user settings FIG. 12 shows a user interface (UI400) for setting the point parameters of the motion unit. Point parameters include point number, axis number, operation mode, target coordinates, velocity, next point number, and the like. In particular, the next point number is a kind of pointer and indicates the point number next to a certain point number. In this example, 1->2->3->4->5->6->7->8-> 1 ... That is, a plurality of point parameters are repeatedly applied in order. When the CPU 21 determines that the point numbers 1 to 8 are one instruction loop, the CPU 21 creates setting information indicating that the period during which the point numbers 1 to 8 are executed is the extraction period, and transfers the points to the PLC1, IPC11, or the cloud 12. do.

● Method for determining the extraction period based on the analysis of the unit settings included in the user settings FIG. 13 shows a user interface (UI410) for setting the operation parameters of the high-speed counter unit. The high-speed counter unit is a kind of expansion unit 4, and has a frequency count mode and a tachometer operation mode. Here, the frequency count mode is selected by the UI410. In particular, in the frequency count mode, the frequency is calculated from the interval of the input pulse input to the high speed counter unit. The reciprocal of this frequency is one cycle. The CPU 21 creates setting information indicating that the reciprocal of the frequency calculated by the high-speed counter unit is the extraction period, and transfers the setting information to the PLC 1, the IPC 11 or the cloud 12. The rising edge of a certain input pulse corresponds to the start position ts of the extraction period. Further, the rising edge of the next input pulse of a certain input pulse corresponds to the end position te of the extraction period.

<Functional block>
FIG. 14 is a block diagram illustrating a function involved in determining the extraction period. Here, the program creation support device 2 determines the extraction period by analyzing the user program and the user setting. The CPU 21 realizes a determination unit 82, an editing unit 94, a transfer unit 97, a display control unit 98, and the like by executing the editing software stored in the editing software storage unit 25. The UI display unit 95 of the editorial unit 94 displays a user interface (UI) that assists the input of the user program on the display unit 7. The UI display unit 95 displays the UI as shown in FIGS. 9 to 13 on the display unit 7. The input receiving unit 96 accepts the input of the user program by the user through the user interface. The user inputs a user program by operating the operation unit 8. That is, the input receiving unit 96 receives the user's instruction input via the operation unit 8. The UI display unit 95 reflects the user input in the user interface. As described with reference to FIGS. 9 to 13, the determination unit 82 analyzes the user program and its user settings, and determines the extraction period. The determination unit 82 stores information indicating the determined extraction period in the setting information 39. The transfer unit 97 transfers a user program such as the ladder program 36 to the PLC 1, and transfers the setting information 39 to the PLC 1, the IPC 11, and the cloud 12. The display control unit 98 displays individual data transmitted from the PLC 1, the IPC 11, and the cloud 12 on the display unit 7.

FIG. 15 is a diagram illustrating a function involved in the extraction process of individual data. Here, the functions involved in the collection of time series data and the extraction of individual data are implemented in PLC1. However, as shown in FIGS. 16 and 17, these functions may be implemented in the IPC 11 or in the cloud 12.

In FIG. 15, the CPU 31 of the basic unit 3 realizes the following functions by executing the control program stored in the storage device 32. The ladder execution unit 80 is a program execution unit that executes a user program and performs arithmetic processing on information stored in a plurality of devices according to the user program. Here, the ladder program 36 is used as an example of the user program. When the user program is a flowchart-type motion program such as an SFC (sequential function chart), the ladder execution unit 80 functions as an execution unit that executes the flowchart-type motion program. The ladder execution unit 80 executes the ladder program 36 stored in the storage device 32, and updates the device value 91 for each scan. The collection unit 81 is a data collection unit that repeatedly collects device data (device value 91) stored in at least one device to form time-series device data (time-series data 92).

The selection unit 87 selects the device values collected by the collection unit 81. For example, the selection unit 87 may select a device that stores the device value to be collected specified by the setting information 39. The selection unit 87 may analyze the user program and select the device to be collected. For example, the selection unit 87 may select all the devices described in the user program. The user may divide a plurality of devices into several groups in the program creation support device 2 and assign a logging target ID to each group. Further, the user selects a group by selecting the logging target ID in the program creation support device 2. The ID of the selected group, that is, the logging target ID is stored in the setting information 39 and transferred to the PLC 1 together with the user program. Therefore, the selection unit 87 acquires the logging target ID stored in the setting information 39, further acquires one or more devices associated with the logging target ID, and collects the acquired device identification information in the collection unit 81. Set. The collection unit 81 collects device values from the set device. The user selects one or more devices for real-time chart format monitoring and debugging in the program creation support device 2, stores the identification information of the selected devices in the setting information 39, and transfers the identification information to the PLC 1 together with the user program. There is. The selection unit 87 may set the device identification information stored in the setting information 39 in the collection unit 81. The real-time chart format monitor is a function in which the program creation support device 2 reads device values from PLC1 at high speed and displays the time-series device values on the display unit 7 in real time in chart format (graph format). .. Debugging is the debugging of the user program. The identification information of the device for debugging is also stored in the setting information 39 and transferred to the PLC 1 together with the user program. The program creation support device 2 acquires the device value of the debugging device from the PLC 1 and displays it on the display unit 7. In this way, a real-time chart format monitor or a device for debugging may be selected for extracting the individual data 93. One or more device values may be displayed not only on the display unit 7 of the program creation support device 2 but also on the display unit 5 of the PLC1. Also in this case, the identification information of the device to be acquired is stored in the setting information 39 and transferred to the PLC 1 together with the user program. Therefore, the selection unit 87 may select the device value to be acquired by the collection unit 81 by analyzing the setting information 39. The selection unit 87 may be provided inside the collection unit 81.

The extraction unit 84 extracts the individual data 93 in each extraction period designated by the setting information 39 from the time series data 92. The granting unit 85 assigns identification information for identifying each individual data to each individual data extracted by the extraction unit 84. The identification information may be, for example, a serial number, but may be other information as long as it is information that can distinguish each individual data. The transmission unit 86 is an option and transmits the individual data 93 to the program creation support device 2 which is a client. When the user considers the individual data 93 in the PLC 1, the CPU 31 may display the individual data 93 on the display unit 5. The display unit 5 may be an external display device connected to the PLC1. The format of the individual data 93 may be CSV format or SQL format. SQL is a type of database language.

FIG. 16 shows an example in which the IPC 11 has a device value collection function and an extraction function. Functions that have already been described are either omitted or briefly explained. The CPU 51 of the IPC 11 realizes various functions by executing a control program stored in the program storage unit 55. As shown in FIG. 16, a collection unit 81, a selection unit 87, an extraction unit 84, an addition unit 85, a transmission unit 86, and the like are mounted. The selection unit 87 sets the acquisition target device in the collection unit 81 based on the setting information 39. The collection unit 81 collects device values from the acquisition target device specified by the setting information 39. For example, the collection unit 81 acquires the device value 91 from the PLC 1 when the acquisition condition (eg, periodical) is satisfied, and stores it in the time-series data storage unit 54 of the storage device 52. The extraction unit 84 extracts individual data 93 for each component according to the extraction period specified by the setting information 39. The giving unit 85 gives identification information to the extracted individual data 93. The transmission unit 86 is an option and transmits individual data 93 to the cloud 12 or the program creation support device 2. When the examination of the individual data 93 is executed in the IPC 11, the CPU 51 displays the individual data 93 on the display unit 57. When the IPC 11 is omitted, these functions are realized by the CPU 61 of the cloud 12, the storage device 62, the display unit 67, and the like.

FIG. 17 shows an example in which the IPC 11 has a device value collection function and the cloud 12 has an extraction function. The collection unit 81 of the IPC 11 collects device values from the device designated by the setting information 39, creates time-series data 92, and transmits the time-series data 92 to the cloud 12. The CPU 61 of the cloud 12 realizes the extraction unit 84, the addition unit 85, and the like by executing the control program stored in the program storage unit 65. The CPU 61 of the cloud 12 stores the time-series data 92 received from the IPC 11 in the time-series data storage unit 64. The extraction unit 84 extracts individual data 93 for each component according to the extraction period specified by the setting information 39. The giving unit 85 gives identification information to the extracted individual data 93. Further, the CPU 61 displays the individual data 93 on the display unit 67. Alternatively, in order to display the individual data 93 on the display unit 7 of the program creation support device 2, the transmission unit 86 may transmit the individual data 93 to the program creation support device 2.

<Flow chart>
● Extraction period determination process FIG. 18 shows an extraction period determination process executed by the CPU 21 of the program creation support device 2. The CPU 21 executes the following steps according to the editing software.
In S1, the CPU 21 (UI display unit 95) displays an editing UI for editing a user program such as the ladder program 36 on the display unit 7.
In S2, the CPU 21 (input receiving unit 96) accepts the input of the user program via the operation unit 8. The input receiving unit 96 and the operation unit 8 function as an input unit.
-In S3, the CPU 21 (decision unit 82) analyzes the user program and the user setting to determine the extraction period. For example, the determination unit 82 determines the extraction period using any of the determination methods described with reference to FIGS. 9 to 13.
In S4, the CPU 21 (decision unit 82) analyzes the user program and user settings to determine the device to be collected. For example, the determination unit 82 may select all the devices described in the user program as the collection target. The determination unit 82 may select a device to be logged or a device designated for debugging as a collection target.
In S5, the CPU 21 (decision unit 82) creates the setting information 39 including the information indicating the extraction period and the information indicating the collection target device.
In S6, the CPU 21 (transfer unit 97) transfers the user program such as the ladder program 36 and the setting information 39 to the PLC1 or the like.

● Collection process FIG. 19 is a flowchart showing a collection process executed by the CPU 31 of the PLC1. The operation unit 6 is provided with a switch for switching between a setting mode and an operation mode. The setting mode is a process of receiving a user program or project data from the program creation support device 2. The operation mode is a mode for executing a user program. When the CPU 31 is instructed to switch from the setting mode to the operation mode, the CPU 31 executes the following processing.
-In S11, the CPU 31 (ladder execution unit 80) loads the user program into the RAM.
-In S12, the CPU 31 (ladder execution unit 80) scans the user program. The ladder execution unit 80 executes a predetermined operation on the device values stored in various devices according to the user program, and updates the device values. The content of the predetermined operation is defined by the user program.
-In S14, the CPU 31 (collecting unit 81) collects device values. The collection unit 81 reads the device value from the device to be acquired selected by the selection unit 87 and adds it to the time series data 92. As described above, the collection process may be executed by the CPU 51 of the IPC 11 or may be executed by the CPU 61 of the cloud 12. The device value collection timing (sampling timing) may be every scan or every few scans. Also, the collection may be performed in the end process or may be in the process of being scanned. Also, multiple collections may be performed in one scan. The collection timing may also be specified by the setting information 39.
-In S15, the CPU 31 (ladder execution unit 80) determines whether or not the program stop is instructed. For example, when the switch described above is switched from the operation mode to the setting mode, the CPU 31 determines that the program is instructed to stop. If the program stop is not instructed, the CPU 31 repeatedly executes the processes of S12 to S14. When the program is instructed to stop, the CPU 31 stops the user program. In this way, the time series data 92 is collected.

FIG. 20 shows an example of time series data 92. The time information is expressed by "minutes: seconds: 1/100 seconds". Here, the devices a, b, c, and d are selected as acquisition targets by the selection unit 87. The devices a and b store one word of data such as the X coordinate and the Y coordinate of the XY stage. The device c is a bit device, here a request relay. The device d is a bit device, here a completion relay. As shown in FIG. 20, at this stage, it will be difficult for the user to identify which part of the time series data 92 corresponds to which component.

● Extraction process FIG. 21 is a flowchart showing an extraction process of individual data. As described above, the extraction process may be executed by any of the CPUs 21, 31, 51, and 61, but here, it is assumed that the extraction process is executed by the CPU 31.
In S21, the CPU 31 (extraction unit 84) acquires information indicating an individual data extraction period from the setting information 39.
In S22, the CPU 31 (extraction unit 84) extracts the individual data 93 for each component from the time-series data 92 according to the information indicating the extraction period.
In S23, the CPU 31 (giving unit 85) assigns identification information to each individual data 93 extracted by the extracting unit 84.

FIG. 22 shows an example of the individual data 93. The extraction unit 84 cuts out individual data 93 for each component from the time-series data 92, and adds identification information to each individual data 93. In FIG. 22, two individual data 93 are exemplified, and "01" and "02" are given as different identification information, respectively. Therefore, the user can easily distinguish the individual data 93 for each component.

In S24, the CPU 31 displays the individual data 93 on the display unit 5. As described above, the CPU 31 may display the individual data 93 on the display unit 7 of the program creation support device 2 by transmitting the individual data 93 to the program creation support device 2. Note that S23 to S24 may be executed synchronously or asynchronously. That is, for example, the CPU 31 may shift to the processing of S24 based on the display instruction of the user. In this case, for example, the CPU 31 repeatedly executes the processes of S22 and S23 until the user's display instruction is given via the operation unit 8, and when the user's display instruction is given, the process proceeds to the process of S24. You may.

According to FIGS. 19 and 21, the collection process of the time series data 92 and the extraction process of the individual data 93 are separated for convenience. However, the collection process and the extraction process may be integrated. FIG. 23 shows a process in which the collection process and the extraction process are integrated.
-In S31, the CPU 31 (ladder execution unit 80) loads the user program into the RAM.
-In S32, the CPU 31 (ladder execution unit 80) scans the user program. The ladder execution unit 80 executes a predetermined operation on the device values stored in various devices according to the user program, and updates the device values. The content of the predetermined operation is defined by the user program.
-In S33, the CPU 31 (collection unit 81) collects device values. The collection unit 81 reads the device value from the device to be acquired selected by the selection unit 87.
In S34, the CPU 31 (extraction unit 84) determines whether or not the timing at which the collection unit 81 collects the device values is during the extraction period specified by the setting information 39. For example, suppose the period during which a relay device is on was specified as the extraction period. In this case, the extraction unit 84 reads out the device value of the relay device specified by the setting information 39, and determines whether or not the device value is on. If the device value of the relay device is on, the extraction unit 84 determines that the extraction period is in progress, and proceeds to S35. On the other hand, if the device value of the relay device is not on, the extraction unit 84 determines that the extraction period is not in progress, and proceeds to S32.
-In S35, the CPU 31 (giving unit 85) creates individual data 93 by giving identification information to the device values collected during the extraction period.
-In S36, the CPU 31 (ladder execution unit 80) determines whether or not the program is instructed to stop. If the program stop is not instructed, the CPU 31 repeatedly executes the processes of S32 to S36. When the program is instructed to stop, the CPU 31 stops the user program. In this way, a series of individual data 93 is collected.

FIG. 24 shows an example of a user interface (UI100) that displays individual data 93. The individual data display unit 101 is a display area for displaying the individual data 93. In this example, two individual data 93 are displayed. Frame 103 is a UI indicating the extraction period. FIG. 25 shows another example of the individual data display unit 101. In this example, two individual data 93 are displayed vertically side by side. FIG. 26 shows another example of the individual data display unit 101. In this example, two individual data 93 are displayed on top of each other. For example, the CPU 21 (display control unit 98) may superimpose the two individual data 93 so that the extraction periods of the two individual data 93 overlap. The display control unit 98 may align one individual data 93 with respect to the other individual data 93 so that the overlapping portion of the two individual data 93 increases. In particular, by displaying the two individual data 93 on top of each other, it will be easier for the user to visually find the subtle difference between the two individual data 93.

<Sequence>
FIG. 27 shows a sequence related to the transmission / reception of the individual data 93. In this example, the collection unit 81, the selection unit 87, the addition unit 85, and the transmission unit 86 are mounted on the CPU 31 of the PLC1. An editing unit 94, a determination unit 82, a transfer unit 97, and a display control unit 98 are mounted on the CPU 21 of the program creation support device 2.
-The program creation support device 2 transmits the user program and the setting information 39 in Sq1, and the PLC 1 receives the user program and stores the setting information 39 in the storage device 32.
-In Sq2, PLC1 obtains a device value according to a user program, and collects time-series data 92 according to setting information 39. The PLC 1 extracts the individual data 93 according to the setting information 39 and transmits the individual data 93 to the program creation support device 2. The program creation support device 2 displays the individual data 93 on the display unit 7.

FIG. 28 shows another sequence associated with the transmission and reception of the individual data 93. In this example, the collection unit 81, the selection unit 87, the extraction unit 84, the addition unit 85, and the transmission unit 86 are mounted on the CPU 51 of the IPC 11.
-The program creation support device 2 transmits the user program in Sq1, and the PLC 1 receives it and stores it in the storage device 32.
-In Sq10, the program creation support device 2 transmits the setting information 39 to the IPC11, and the IPC11 receives the setting information 39 and stores it in the storage device 52.
-In Sq11, PLC1 obtains a device value according to a user program. The IPC 11 reads (receives) the device value from the PLC 1 according to the setting information 39.
-IPC11 in Sq12 creates time series data 92 from the collected device values. The IPC 11 extracts the individual data 93 from the time-series data 92 according to the setting information 39, and transmits the individual data 93 to the program creation support device 2. When the program creation support device 2 receives the individual data 93 from the IPC 11, the individual data 93 is displayed on the display unit 7.

FIG. 29 shows yet another sequence associated with the transmission and reception of the individual data 93. In this example, the collection unit 81 and the selection unit 87 are mounted on the CPU 51 of the IPC 11. An extraction unit 84, an addition unit 85, and a transmission unit 86 are mounted on the CPU 61 of the cloud 12.
-The program creation support device 2 transmits the user program in Sq1, and the PLC 1 receives it and stores it in the storage device 32.
-In Sq20, the program creation support device 2 transmits the setting information 39 to the IPC11, and the IPC11 receives the setting information 39 and stores it in the storage device 52. The setting information 39 includes information indicating the device to be collected.
-In Sq21, the program creation support device 2 transmits the setting information 39 to the cloud 12, and the cloud 12 receives this and stores it in the storage device 62. The setting information 39 includes information indicating an extraction period.
-In Sq22, PLC1 obtains a device value according to a user program. The IPC 11 reads (receives) the device value from the PLC 1 according to the setting information 39.
-IPC11 creates time-series data 92 from the collected device values in Sq23, and transmits the time-series data 92 to the cloud 12. The cloud 12 receives the time series data 92 from the IPC 11.
From Sq23, the cloud 12 extracts the individual data 93 from the time-series data 92 according to the setting information 39, and transmits the individual data 93 to the program creation support device 2. When the program creation support device 2 receives the individual data 93 from the cloud 12, the individual data 93 is displayed on the display unit 7.

FIG. 30 shows yet another sequence associated with the transmission and reception of the individual data 93. In this example, the collection unit 81, the selection unit 87, the extraction unit 84, the grant unit 85, and the transmission unit 86 are mounted on the CPU 61 of the cloud 12.
-The program creation support device 2 transmits the user program in Sq1, and the PLC 1 receives it and stores it in the storage device 32.
-In Sq30, the program creation support device 2 transmits the setting information 39 to the cloud 12, and the cloud 12 receives this and stores it in the storage device 62. The setting information 39 includes information indicating the collection target device and information indicating the extraction period.
-In Sq31, PLC1 obtains a device value according to a user program. The cloud 12 collects (reads) device values from the collection target device of PLC1 according to the setting information 39. The cloud 12 creates time series data 92 from the collected device values.
-In Sq32, the cloud 12 extracts the individual data 93 from the time-series data 92 according to the setting information 39, and transmits the individual data 93 to the program creation support device 2. When the program creation support device 2 receives the individual data 93 from the cloud 12, the individual data 93 is displayed on the display unit 7.

<Display result>
FIG. 31 shows a display example of the individual data 93. The CPU 21 (display control unit 98) of the program creation support device 2 displays a plurality of individual data 93 on the display unit 7. In this example, the first individual data 93 is formed by the device values acquired from 00:00:00 to 00:02:70, and "01" is added as the identification information. The second individual data 93 is formed by the device values acquired from 00:03:00 to 00:06:00, and "02" is added as the identification information. The third individual data 93 is formed by the device values acquired from 00:06:30 to 00:09: 00, and "03" is added as the identification information. The CPU 21 may compare each device value with a tolerance (threshold value) and highlight a device value that deviates from the tolerance. Further, the CPU 21 may highlight the device value in which the completion relay is 1 at a timing different from the normal timing.

In the example shown in FIG. 31, the device value c acquired at time 00:01:50 in the first individual data 93 is determined to be NG and is highlighted. The user uses the device value a acquired at time 00:01:20 and the device having the same phase (time 00:04:20, 00:07:20) in the second individual data 93 and the third individual data 93. Compare the values a. The device value a acquired at time 00:04:20 is 5.9, and the user determines that it is an appropriate value. Further, the device value a acquired at time 00:07:20 is 4.4, which is an appropriate value for the user, but it can be determined that there is almost no margin for 4.2, which is NG. As a result, the user can determine that some measures are required for the device value a.

<Summary>
The technical idea derived from the above examples will be described. PLC1 is an example of a programmable logic controller that repeatedly executes a user program. The PLC1 may control inspection or machining of a plurality of parts according to a user program. A part may be called a work, and is a term including a finished product. The storage device 32 is an example of a program storage unit that stores a user program. The storage device 32 can be specified by a user program, and is an example of a device storage unit that holds a plurality of devices including a bit device that stores one bit or several words of information and a word device that stores one word of information. The ladder execution unit 80 is an example of a program execution unit that repeatedly executes a user program stored in the program storage unit and performs arithmetic processing on information stored in a plurality of devices according to the user program. The collection unit 81 is an example of a data collection unit that repeatedly collects device data stored in at least one device to form time-series device data having periodicity. The determination unit 82 is an example of a determination unit that determines an extraction period for extracting individual data for each cycle from time-series device data. The extraction unit 84 is an example of an extraction unit that extracts individual data in each extraction period determined by the determination unit 82 from the time-series device data. The granting unit 85 is an example of a granting unit that assigns identification information for identifying each individual data to each individual data extracted by the extraction unit 84. In particular, the determination unit 82 determines the extraction period based on the execution timing or execution cycle of the repetitive instruction in the user program. For example, the determination unit 82 determines the extraction period of the individual data by analyzing the user program and the user information accompanying the user program. As described above, according to this embodiment, it becomes easy for the user to extract individual data from the time series data. The "repeated instruction" includes various instructions according to the type of the user program. For example, when the user program is a ladder program, the instruction word described in the ladder program may be included. Further, when the user program is a flowchart format program such as SFC (sequential function chart), an instruction module constituting the flowchart may be included.

The PLC 1 may further have a synchronization unit that synchronizes the execution process of the user program in the program execution unit with the collection process of the data collection unit in the data collection unit. For example, when the ladder execution unit 80 starts executing the ladder program, the collection unit 81 may start collecting time-series data.

As shown in FIG. 11, the user program may be a flow chart type motion program that controls the position of the controlled object. As shown in FIG. 12, the determination unit 82 may determine the extraction period based on the point parameter for moving the controlled object to a specific position. As shown in FIG. 12, the point parameter setting information includes a plurality of point numbers, a movement amount of a controlled object for each point number (example: target coordinates), and a point number next to each point number. May be. The determination unit 82 may detect a loop of the movement command to be controlled based on the point number next to each point number, and determine a period corresponding to the loop as the extraction period.

As shown in FIGS. 9 and 10, the user program may be a ladder program. As shown in FIG. 9, the determination unit 82 may obtain an execution cycle of a specific function block, which is an instruction described in the ladder program 36a, and determine the execution cycle as the extraction period. The determination unit 82 rises or falls from the rise or fall of the first signal (eg, EN signal) that is the execution trigger of the specific function block to the rise or fall of the second signal (eg, the completion relay) that indicates the completion of execution of the specific function block. The period until the fall may be determined as the extraction period.

As described with reference to FIG. 13, a high-speed counter unit may be connected to the PLC1. The determination unit 82 analyzes whether or not the operation mode of the high-speed counter unit is set to the frequency count mode in the user program. The determination unit 82 may determine the extraction period based on the interval of the pulse signal input to the high-speed counter unit when the operation mode of the high-speed counter unit is set to the frequency count mode.

The PLC 1 may have a program creation support device 2 that assists the user in creating a user program (or may be connected to the program creation support device 2). As shown in FIG. 14, the determination unit 82 may be provided in the program creation support device 2. As described above, the determination unit 82 may be provided in the PLC 1, the program creation support device 2, or the cloud 12.

The program creation support device 2 writes information indicating the extraction period determined by the determination unit 82 in the program storage unit 35 together with the user program. The extraction unit 84 may extract the individual data 93 from the time-series device data (time-series data 92) based on the information indicating the extraction period stored in the program storage unit 35 (example: setting information 39).

The collecting unit 81 may be provided in any of the IPC 11, the cloud 12, and the program creation support device 2. The extraction unit 84 and the grant unit 85 may also be provided in any of the IPC 11, the cloud 12, and the program creation support device 2. In this case, the IPC 11, the cloud 12, or the program creation support device 2 functions as a data collection device.

The start position and end position of the extraction period are defined by the information indicating the reference position for extraction of the individual data 93 (example: reference time tr) and the information indicating the temporal length of the extraction period (example: length P). May be done. The time-series device data may include a data group including data collected by the collection unit 81 from a plurality of devices, and timing information indicating the timing at which the data is collected. As shown in FIG. 16 and the like, in the time series data 92, each device value of the devices a to d is an example of a data group. The acquisition time information is an example of timing information.

The determination unit 82 may determine a reference position for each extraction period based on the period of time-series device data collected from at least one of the plurality of devices. This is an example of a reception unit that accepts input of a numerical input box 105 and a tact time tt for a part. As shown in FIG. 9, the determination unit 82 obtains the cycle of the data collected from each of the plurality of devices, and determines the reference position of each extraction period based on the data having a cycle relatively close to the takt time tt. You may. As described with reference to FIG. 10, the determination unit 82 may differentiate the time-series device data to obtain the differential edge, and determine the position of the obtained differential edge as the reference position of the extraction period. As described in connection with the menu 104, the determination unit 82 may have a plurality of determination methods for determining the reference position. The determination unit 82 may determine the reference position using a determination method selected by the user.

The determination unit 82 acquires a plurality of spectra of the time-series device data by Fourier transform or an autoregressive model, and determines the inverse of the frequency of the relatively large spectrum among the plurality of spectra as the temporal length of the extraction period. You may. Workpieces such as parts are produced or inspected at regular intervals. Therefore, the time series data has periodicity. Therefore, the temporal length P of the extraction period can be specified relatively accurately by using the FFT or AR model. As described with reference to FIG. 11, the determination unit 82 may determine the temporal length P of the extraction period based on the similarity of the waveforms in the time series device data. The determination unit 82 has a plurality of determination methods for determining the temporal length P of the extraction period, and determines the temporal length P of the extraction period using the determination method selected by the user. May be good. It will be easier for users to choose the decision method that they consider more appropriate. For example, the determination unit 82 may adopt a determination method selected by the user from a determination method based on an FFT, a determination method based on an AR model, a determination method based on shape similarity, and the like. A menu for selecting a determination method may be added to the UI 100.

The storage device 32 may store the project information (setting information 39) for managing the user program. The collection unit 81 may select a plurality of devices for which device data is to be collected based on the project information, and collect device data from each of the selected plurality of devices. For example, the project information may include information that specifies a device for debugging registered by the user. The collection unit 81 or the selection unit 87 may select a plurality of devices for which device data is to be collected based on information specifying a device for debugging, and may collect device data from each of the selected plurality of devices. .. This will reduce the burden on the user to specify the device to be collected.

The project information may include information that specifies the device to be displayed registered by the user. The collection unit 81 or the selection unit 87 may select a plurality of devices for which device data is to be collected based on information specifying the device to be displayed, and may collect device data from each of the selected plurality of devices. ..

As shown in FIGS. 24 and 25, the display unit 7 has a common time axis of the waveform of the time-series device data collected from the first device and the waveform of the time-series device data collected from the second device. It may be displayed side by side on the top. As shown in FIG. 26, the display unit 7 superimposes the waveform of the time-series device data collected from the first device and the waveform of the time-series device data collected from the second device on a common time axis. May be displayed. This will make it easier for users to find differences in individual data for each work. The display unit 7 may be provided in the program creation support device 2 which is connected to the PLC 1 and supports the user to create a user program.

The transmission unit 86 is an example of a transmission unit that transmits the time-series data 92 and the individual data 93 to which the identification information is attached to the cloud 12. As a result, the cloud 12 may extract individual data from the time series data 92, or may analyze the individual data 93 in more detail. For example, the CPU 61 of the cloud 12 may compare a plurality of individual data 93 or specify individual data 93 including NG data. NG is an abbreviation for no good.

The CPUs 31 and 51 may store the data files formed from the plurality of individual data 93 to which the identification information is given in the storage devices 32 and 52, respectively. For example, CSV format or SQL format data files may be created. The transmission unit 86 of the CPUs 31 and 51 transfers the data file to the cloud 12. The CSV format and SQL format are only examples, and the format required by the cloud 12 may be adopted. Further, the individual data 93 is not stored in the format of a data file, but may be stored in the storage devices 32 and 52 as a part of the time series data 92. That is, "extracting the individual data 93 from the time-series data 92" means, of course, extracting the individual data 93 from the time-series data 92 as data separated from the time-series data 92 by cutting out or copying the individual data 93. It also includes simply specifying the part corresponding to the individual data 93 in the time series data 92. In this case, the individual data 93 is not separated from the time series data 92 and is stored in the storage devices 32 and 52 as a part of the time series data 92.

Claims (13)

A programmable logic controller system that controls the operation of controlled devices by repeatedly executing user programs.
A program storage unit that stores the user program and
A device storage unit that can be specified on the user program and holds a plurality of devices including a bit device that stores one bit of information and a word device that stores one word or several words of information.
A program execution unit that repeatedly executes a user program stored in the program storage unit and performs arithmetic processing on information stored in the plurality of devices according to the user program.
By repeatedly collecting device data stored in at least one device among the devices held in the device storage unit, time-series device data having periodicity corresponding to the repeated operation of the controlled device is formed. Data collection department and
By analyzing the user program, an instruction loop in which a plurality of instructions are repeatedly executed according to the rise or fall of the execution trigger is identified, and based on the specified instruction loop, the cycle is obtained from the time-series device data. A decision unit that determines the execution trigger that serves as a reference for determining an extraction period for extracting a plurality of individual data according to gender .
An extraction unit that extracts a plurality of individual data according to the periodicity from the time-series device data based on the timing at which the execution trigger determined by the determination unit changes.
A programmable logic controller system characterized by having an addition unit that assigns identification information for identifying each individual data to each individual data extracted by the extraction unit. The programmable logic controller system according to claim 1, further comprising a synchronization unit that synchronizes the execution process of the user program in the program execution unit with the collection process of the data collection unit in the data collection unit. The programmable logic controller system according to claim 1 or 2, wherein the determination unit determines the extraction period based on a point parameter for moving a controlled object to a specific position. The point parameter setting information includes a plurality of point numbers, a movement amount of the controlled object for each point number, and a point number next to each point number.
The third aspect of claim 3, wherein the determination unit detects a loop of the movement command to be controlled based on the point number next to each point number, and determines a period corresponding to the loop in the extraction period. Programmable logic controller system. The user program is a ladder program.
The programmable system according to claim 1 or 2, wherein the determination unit obtains an execution cycle of a specific function block which is an instruction described in the ladder program, and determines the execution cycle in the extraction period. Logic controller system. The determination unit sets the period from the rise or fall of the first signal, which is the execution trigger of the specific function block, to the rise or fall of the second signal indicating the completion of execution of the specific function block as the extraction period. The programmable logic controller system according to claim 5, wherein the determination is made. A high-speed counter unit is connected to the programmable logic controller provided in the programmable logic controller system.
The determination unit analyzes whether or not the operation mode of the high-speed counter unit is set to the frequency count mode in the user program, and when the operation mode of the high-speed counter unit is set to the frequency count mode, the determination unit Claim 1 or 2 is characterized in that the extraction period is determined with the rising edge or falling edge of the pulse signal input to the high-speed counter unit as the reference position and the period obtained from the interval of the pulse signals as the length. Programmable logic controller system described in. Claim 1 to claim 1, wherein the start position and the end position of the extraction period are defined by information indicating a reference position for extraction of the individual data and information indicating the temporal length of the extraction period. 7. The programmable logic controller system according to any one of 7. The programmable logic controller provided in the programmable logic controller system is connected to a program creation support device that assists the user in creating the user program.
The programmable logic controller system according to any one of claims 1 to 8, wherein the determination unit is provided in the program creation support device. The program creation support device writes information indicating the extraction period determined by the determination unit to the program storage unit together with the user program.
The programmable logic controller according to claim 9, wherein the extraction unit extracts the individual data from the time-series device data based on the information indicating the extraction period stored in the program storage unit. system. A data acquisition device connected to a programmable logic controller that controls the operation of controlled devices by repeatedly executing user programs.
The programmable logic controller is
A program storage unit that stores user programs and
A device storage unit that can be specified on the user program and holds a plurality of devices including a bit device that stores one bit of information and a word device that stores one word or several words of information.
It has a program execution unit that repeatedly executes a user program stored in the program storage unit and performs arithmetic processing on information stored in the plurality of devices according to the user program.
The data acquisition device is
By repeatedly collecting device data stored in at least one device among the devices held in the device storage unit, time-series device data having periodicity corresponding to the repeated operation of the controlled device is formed. Data collection department and
Based on the timing at which the execution trigger, which is the reference for determining the extraction period for extracting a plurality of individual data according to the periodicity from the time-series device data, changes, the periodicity is adjusted from the time-series device data. An extraction unit that extracts multiple individual data, and an extraction unit
Each individual data extracted by the extraction unit has an addition unit that assigns identification information for identifying each individual data.
The programmable logic controller is
By analyzing the user program, an instruction loop in which a plurality of instructions are repeatedly executed according to the rise or fall of the execution trigger is identified, and based on the specified instruction loop, the time-series device data is used to identify the instruction loop. It has a determination unit that determines the execution trigger that serves as a reference for determining the extraction period for extracting a plurality of individual data according to the periodicity .
The extraction unit is a data collection device characterized by extracting a plurality of individual data according to the periodicity from the time-series device data based on the timing at which the execution trigger determined by the determination unit changes. .. The data collection device according to claim 11, wherein the data collection device is a server constituting a cloud. A program creation support device that assists the user in creating a user program that is repeatedly executed by a programmable logic controller that controls the operation of the controlled device.
A display unit that displays a user interface that assists the input of the user program, and
An input unit that accepts input from the user program through the user interface,
The user program is analyzed, an instruction loop in which a plurality of instructions are repeatedly executed according to the rise or fall of the execution trigger is identified, and based on the specified instruction loop, the repeated operation of the controlled device is performed. A determination unit that determines the execution trigger that serves as a reference for determining an extraction period for extracting a plurality of individual data according to the periodicity from time-series device data having periodicity .
It has a transfer unit that transfers the user program and information indicating the execution trigger to the programmable logic controller.
The execution trigger is based on the timing at which the execution trigger changes from the time-series device data formed by repeatedly collecting the device data stored in at least one device in the programmable logic controller. A program creation support device characterized in that it serves as a standard for determining an extraction period for extracting a plurality of individual data according to periodicity .

Images