JP4659643B2 - Logging system - Google Patents

Description

  The present invention relates to a logging system that performs a logging process for collecting control data (input / output data and internal data) of a control device in order to monitor / analyze the operation state of the control device and the state of a control target. The present invention relates to a logging system that synchronizes with the control cycle and logs every control cycle.

  A conventional logging system that performs polling logging is configured to include a control device that performs predetermined control and a logging device that performs logging of control data. Here, the control device includes a control execution unit that executes a predetermined control function in accordance with a control program, and control data that is a control target of the control execution unit. Further, the logging device acquires a control data from the control device and records it in an internal memory, an internal bus electrically connected to exchange control data between the control device and the own logging device, And an internal memory for recording the control data acquired from the control device in time series.

  In the conventional logging system that performs the polling type logging configured as described above, the logging execution unit periodically acquires the control data and stores the data in the internal memory in time series to execute the logging. In acquiring the control data, a method of directly acquiring data flowing in the internal bus or a method of acquiring a data acquisition request to the control device via the internal bus and acquiring the data as a response is used. In the former, input / output data of the control device flowing in the internal bus can be acquired relatively easily, whereas in the latter, control data including internal data of the control device can be acquired.

  Further, the logging execution unit synchronizes the acquisition of control data with the control cycle of the control execution unit by monitoring the control cycle of the control execution unit. In monitoring the control cycle, there are a method of monitoring a pattern of input / output data flowing on the internal bus and a method of inquiring the end point of the control cycle to the control device via the internal bus (for example, see Patent Document 1).

  As a conventional logging system, a logging system that performs push-type logging is also used. Such a push-type logging system includes a control device that performs predetermined control and a logging device that performs logging of control data. Here, the control device, a control execution unit that executes a predetermined control function according to a control program, control data to be controlled by the control execution unit, a data collection unit that performs temporary time series recording of the control data, It comprises a temporary memory for temporarily recording control data in time series, and read permission information indicating whether or not the time series data in the temporary memory can be read.

  Here, the data collection unit can be realized as dedicated hardware or software, or as a part of a control program that can be executed by the control execution unit.

  Further, the logging device acquires a control data from the control device and records it in an internal memory, an internal bus electrically connected to exchange control data between the control device and the own logging device, And an internal memory for recording the control data acquired from the control device in time series.

  In the logging system that performs the conventional push type logging configured as described above, the logging execution unit acquires the data recorded in time series in the temporary memory in the control device by the data collection unit, and stores this data in the logging device. Logging is performed by recording time series in the internal memory.

  First, in the control device, the data collection unit records the control data in a temporary memory in time series for each control cycle of the control execution unit. At the same time, when the time-series data in the temporary memory satisfies a specific condition, the data collection unit sets the read permission flag to the read permission state. This condition may be that the time series data reaches the capacity of the temporary memory, the control data changes to a specific value, or a specific event occurs in the control device.

  On the other hand, in the logging device, the logging execution unit periodically monitors the read permission flag in the logging device. This monitoring is executed by a method for making a read permission flag acquisition request from the logging execution unit to the control device via the internal bus and acquiring the read permission flag as a response.

  As a result of monitoring, if the read permission flag is in the read permission state, the logging execution unit collects the time series data of the temporary memory in the control device in a lump and records this in time series in the internal memory in the logging device. To do. The logging execution unit can efficiently execute control data logging by repeating this operation.

  It is also conceivable to provide a plurality of temporary memories in order to log control data while the logging execution unit acquires data in the temporary memory (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 2000-235412 JP 2004-310592 A

  However, in the conventional logging system that performs the polling type logging, it is necessary to monitor the control cycle, acquire the control data, and record the time series in the internal memory for each control cycle of the control execution unit. It is difficult to realize this when the control cycle is short.

  Also, in order to realize the operation of the logging execution unit that is faster than the control cycle of the control execution unit of the control device, it is necessary to configure the logging device with hardware that is faster and more expensive than the control device. Is the end of the fall when considering the whole control system whose main purpose is to control.

  Also, in the above-described conventional logging system that performs polling-type logging, when the former method is used to monitor the control cycle and acquire control data, the control data that can be acquired is the input / output data flowing on the internal bus. However, the internal data in the control device cannot be acquired.

  In addition, when the control cycle is monitored and the control data is acquired by the latter method, the logging execution unit makes a request to the control device every time it is monitored and acquired. Therefore, the control operation, which is the main purpose of the control device, is adversely affected such as a delay. In addition, when the control device delays the response processing to the request from the logging execution unit in order to give priority to the control operation, the logging execution unit cannot realize logging synchronized with the control cycle.

  On the other hand, in a conventional logging system that performs push-type logging, the logging execution unit makes a request to the control device each time the read permission flag is monitored and time series data in the temporary memory is acquired, and the control device responds to this request. It is necessary to execute the process, which adversely affects the control operation, which is the main purpose of the control device, such as delay. In this case, since the data acquisition process is more efficient than the above-mentioned polling-type logging system, the influence on the control device is small as a whole, but in order to acquire data all at once, This will adversely affect the control device.

  In addition, when the control device delays the response processing to the request from the logging execution unit in order to give priority to the control operation, a delay occurs in the data acquisition from the temporary memory of the logging execution unit, and the data collection unit stores the data in the temporary memory. When the data is overwritten, the time series data is lost.

  Further, in a logging system that performs push-type logging, it is necessary to provide a data collection unit in the control device. However, when it is realized by dedicated hardware or software, there is a cost. If the data collection unit is implemented as part of a control program that can be executed by the control execution unit, it will be necessary to create a program each time the control data to be logged and the logging conditions change, resulting in human costs. It takes.

  The present invention has been made in view of the above, and is a logging system that logs data of a control device. The logging device uses hardware having performance equal to or less than that of the control device. It is an object of the present invention to provide a logging system that can execute data logging for each control period regardless of the control period.

In order to solve the above-described problems and achieve the object, a logging system according to the present invention includes a control device that executes predetermined control and retains data related to the control, and is connected to the control device in an accessible manner. A storage device that stores data held by the device in time series, and a logging device that is connected to the storage device so as to be accessible and reads and logs the data stored in the storage device. The storage device has a function unit that acquires the retained data, sends it to the storage device, and writes it. The storage device stores the data written by the function unit in a ring buffer format in time series, and the storage by the function unit By the logging device and the writing position area that stores the writing position information indicating the position where the data was written in the previous writing process to the area A read position area for storing read position information indicating a position where data was read in the previous read process from the storage area, and the functional unit reads the write position information and the data when writing the data to the storage area. The position information is obtained from the storage device and the information is collated. When the information matches, the data acquisition is stopped. When the information does not match, the position information is indicated by the write position information in the storage area. Data is recorded at a position next to the position to be recorded, and push type logging is performed from the control device to the logging device via a storage device.

  According to this invention, the storage device for time-series buffering of data is provided between the control device and the logging device, the control device data is temporarily stored in the storage device, and the data stored in the storage device is logged. Capture and store in the device. Thereby, the logging device can acquire data efficiently and at high speed at an arbitrary timing, and it is possible to realize logging for each control cycle even when the control cycle of the control device is short.

  Further, according to the present invention, since the logging device does not need to perform a high-speed operation as compared with the control cycle of the control device, the logging device can be realized with a configuration having a performance equivalent to or lower than that of the control device. , Has the effect.

  In addition, the logging device does not issue a logging processing request to the control device, and when the logging device acquires control data, the control device does not need to perform response processing to the data acquisition request from the logging device. There is an effect that no load is applied and the execution of the control function is not affected.

  Hereinafter, an embodiment of a logging system according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably.

Embodiment.
FIG. 1 is a diagram showing a schematic configuration of a logging system according to a preferred embodiment of the present invention. As shown in FIG. 1, the logging system according to the present embodiment includes a control device 11 for performing sequence control, a shared memory 21 that is a storage unit for time-series buffering of control data, A logging device 31 for acquiring control data, a specification parameter for specifying control data to be logged as a logging parameter and a logging condition information setting means for specifying a logging condition, and a logging setting tool 42 are installed. And a personal computer 41.

  The control device 11 includes a control execution unit 13 and a data collection unit 15. The control execution unit 13 includes a control execution unit 13 that executes a predetermined control function in accordance with a control program 12 for the own control device 11 to perform control, and control data 14 related to the control of the control execution unit 13 that is a logging target. Prepare. Further, the data collection unit 15 acquires the control data 14 to be logged set by the logging setting tool 42 in the personal computer 41 and records it in the shared memory 21.

  Further, the data collection unit 15 is a sequence that can be controlled by the control device 11 based on the designation information for specifying the control data to be logged and the logging condition information for specifying the logging condition set by the logging setting tool 42. The function is realized by a program generated by the generation unit 34 of the logging device 31 as a program. The control device 11 and the logging device 31 are electrically connected by an internal bus 51.

  The shared memory 21 is storage means for buffering the control data 14 generated by the control device 11 in a time series, so-called shared memory, and can be accessed from both directions of the control device 11 and the logging device 31. Works in a time-series ring buffering format.

  The shared memory 21 has a sufficient capacity for storing the control data 14. In the shared memory 21, for example, as shown in FIG. 1, the control data 14 such as the control data record (1), the control data record (2),... Remembered. Here, the control data record (1) is the oldest data in time series, and the control data record (M) is the newest data in time series.

  In addition, the shared memory 21 stores the write position information indicating the position where the data collection unit 15 has written the control data 14 in the own shared memory 21 for each sequence control cycle in the control device 11 in the area “write position” in the own memory. Remember. In addition, the shared memory 21 stores read position information indicating the position at which the logging device 31 has read the control data 14 from the own shared memory 21 at each sequence control cycle in the control device 11 in the area “read position” in the own memory. To do.

  The logging device 31 includes an internal memory 32, a logging execution unit 33, and a generation unit 34. The internal memory 32 is an internal memory in the logging device 31 for finally storing the control data 14 in the control device 11 to be logged. The internal memory 32 has a sufficient capacity for storing the control data 14 to be logged.

  In this internal memory 32, for example, as shown in FIG. 1, control data record (X), control data record (1), control data record (2),..., Control data record (M), control data record ( Control data 14 is stored in time series as in (N). Here, the control data record (X) is the oldest data in time series, the control data record (N) is the newest data in time series, and the control data record (X) is originally the internal memory. 32 shows a state in which the control data record (1), the control data record (2),..., The control data record (M), and the control data record (N) are stored in this order. Yes.

  The logging execution unit 33 collects the control data 14 to be logged in the logging device. That is, the logging execution unit 33 acquires from the shared memory 21 the control data 14 to be logged written in the shared memory 21 between the control device 11 and the logging device 31 by the data collecting unit 15 in the control device 11. And an execution unit for writing into the internal memory 32 in the logging device 31 and storing it.

  Further, the logging execution unit 33 is a program that can be controlled by the logging device 31 based on the specification information for specifying the control data to be logged and the logging condition information for specifying the logging conditions set by the logging setting tool 42. The function is realized by a program generated by the generation unit 34.

  The generation unit 34 is configured to cause the control device 11 to execute the data collection unit 15 that writes the control data 14 in the control device 11 to the shared memory 21 between the control device 11 in the logging device 31 and the logging device 31. Automatically generated as a possible sequence program. That is, the control unit 11 executes the data collection unit 15 based on the specification information for specifying the control data to be logged and the logging condition information for specifying the logging condition set by the logging setting tool 42. It is automatically generated as a sequence program that can be used.

  The generation unit 34 also includes a logging execution unit 33 for writing the control data 14 written in the shared memory 21 between the control device 11 and the logging device 31 to the internal memory 32 in the logging device 31. 31 is automatically generated as a program that can be executed. That is, the generation unit 34 executes the logging execution unit 33 based on the specification information for specifying the control data to be logged and the logging condition information for specifying the logging condition set by the logging setting tool 42. Automatically generated as a program that can do.

  Next, a logging processing method in the logging system according to the present embodiment configured as described above will be described. FIG. 2 is a flowchart showing a logging parameter setting method for setting the control data 14 in the control device 11 that is the target of the logging process in the logging system according to the present embodiment.

  First, the logging setting tool 42 in the personal computer 41 is used to input and set logging parameters such as the type and size of the control data 14 to be logged (step S100). The control data 14 to be logged set in step S100 is written to, for example, the internal memory 32 in the logging device 31 via the communication cable 43 (step S110).

  Next, in the logging device 31, the generation unit 34 generates a sequence program that can be executed by the control device 11 as the data collection unit 15 based on the logging parameters set in step S 100 and written in the internal memory 32 in step S 110. Automatically generated (step S120), and the automatically generated sequence program (data collection unit 15) is written to the control device 11 via the internal bus 51 (step S130).

  Further, the logging device 31 controls the control data 14 written in the shared memory 21 between the control device 11 and the logging device 31 based on the logging parameters set in step S100 and written in the internal memory 32 in step S110. Is automatically generated by the generation unit 34 as the logging execution unit 33 for writing the data to the internal memory 32 in the logging unit 31 and written in the logging unit 31.

  When the control device 11 is executed after writing the data collection unit 15, the control data 14 of the type and size set by the logging setting tool 42 in the personal computer 41 is transferred between the control device 11 and the logging device 31 by the data collection unit 15. It is written in a certain shared memory 21. Further, when the control device 11 is executing the control process, the above-described logging is started when the logging device 31 writes the control device 11 via the internal bus 51.

  Next, a procedure of processing in which the control device 11 writes the control data 14 to the shared memory 21 between the control device 11 and the logging device 31 will be described with reference to FIG. FIG. 3 is a flowchart for explaining a process in which the control device 11 writes the control data 14 to the shared memory 21 in the logging system according to the present embodiment.

  First, when the logging device 31 is activated, the data in the internal memory 32 in the logging device 31 is in a cleared state. Further, the head position of the shared memory 21 is assigned to the area “write position” and the area “read position” in the shared memory 21 between the control device 11 and the logging device 31. Then, when the logging process is started by the procedure shown in FIG. 2, the data collection unit 15 of the control device 11 acquires the control data 14 designated by the setting of the logging parameter (step S200).

  In order to know the writing position when the acquired control data 14 is written in the shared memory 21 between the control device 11 and the logging device 31, the data collection unit 15 sends the control data 14 to the shared memory 21 in the previous data collection. The writing position is acquired as writing position information from the area “writing position” of the shared memory 21 (step S210). However, since there is no previous writing position information at the initial time, the head position of the shared memory 21 between the control device 11 and the logging device 31 written at the initialization is used.

  For example, when the control data 14 cannot be acquired from the shared memory 21 due to a trouble of the logging device 31 or the like, the data collection unit 15 overwrites the control data 14 in the shared memory 21 so that the logging execution unit 33 is still in the internal memory In order to prevent the control data 14 not recorded in 32 from being deleted (so as not to be overwritten), the data collection unit 15 stores the control data 14 from the shared memory 21 for the logging execution unit 33 to record in the internal memory 32 last time. Read position information is acquired as the read position information (step S220).

  For the reason described above, the data collection unit 15 collates the acquired read position information with the write position information (step S230).

  Here, if the read position and the write position match as a result of collating the acquired read position information and the write position information (Yes at Step S230), the control data 14 to the shared memory 21 by the data collecting unit 15 is stored. In order to prevent overwriting, the data collection unit 15 in the control device 11 stops acquiring the control data 14.

  Further, the data collection unit 15 notifies the personal computer 41 of the control data acquisition stop information via the logging device 31 in order to notify the user of the control data acquisition stop. The personal computer 41 displays an error message informing the content that the logging has not been executed on a connected display device or the like (step S240). Thereby, in the logging system according to the present embodiment, a function of detecting and notifying that the control data 14 is not acquired every sequence control period is realized.

  On the other hand, returning to step S230, when the acquired read position and the write position are collated, if the write position and the read position are different (No at step S230), the write position acquired at step S210 is incremented (step S250). ). Then, in the memory area of the shared memory 21 between the control device 11 and the logging device 31, the control data 14 acquired in step S200 is written in the incremented write position.

  Further, the write position incremented in the above-described step S250 is written as write position information in the area “write position” of the shared memory 21 between the control device 11 and the logging device 31 (step S260).

  Then, the processing from step S200 to step S260 described above is executed at regular intervals, for example, every control cycle in synchronism with the control cycle in the control execution unit 13 of the control device 11, whereby the data to be logged in the control device 11 is recorded. The control data 14 can be written to the shared memory 21 between the control device 11 and the logging device 31 in time series. In addition, the logging execution unit 33 in the logging device 31 can prevent the control data 14 that has not yet been written to the internal memory 32 from being overwritten and can realize a notification function.

  Next, a procedure of processing in which the logging execution unit 33 in the logging device 31 acquires the control data 14 from the shared memory 21 and writes it in the internal memory 32 will be described with reference to FIG. FIG. 4 is a flowchart for explaining a process in which the logging execution unit 33 acquires the control data 14 from the shared memory 21 and writes it in the internal memory 32 in the logging system according to the present embodiment.

  The logging execution unit 33 in the logging device 31 reads out and acquires the read position information written in the area “read position” in the shared memory 21 in order to know from where in the shared memory 21 the control data 14 is acquired. . However, since the previous read position information does not exist at the initial time, the head position of the shared memory 21 written at the initialization is used (step S300).

  Next, the logging execution unit 33 in the logging device 31 reads the write position information from the area “write position” in the shared memory 21 in order to know how far the control data 14 is acquired in the shared memory 21 (step S310). ).

  Next, the logging device 31 acquires the control data 14 in the shared memory 21 from the read position to the write position read in steps S300 to S310 (step S320). That is, the logging execution unit 33 in the logging device 31 reads the control data 14 in the shared memory 21 from the read position to the write position read in steps S300 to S310, and writes it in the internal memory 32 in the logging device 31. . In the internal memory 32 of the writing destination, writing is performed from the position where the previous writing has been completed.

  After completing the writing of the control data 14 to the internal memory 32, the logging execution unit 33 in the logging device 31 reads the position where the control data 14 is read from the shared memory 21 into the area “read position” of the shared memory 21 as read position information. Write and set. Further, the logging execution unit 33 in the logging device 31 writes the writing position where the control data 14 has been written to the internal memory 32 in the logging device 31 as writing position information in the area “writing position” in the internal memory 32. Are set (step S330).

  By executing the above-described processing from step S300 to step S330 in a constant cycle, for example, every control cycle in synchronization with the control cycle in the control execution unit 13 of the control device 11, between the control device 11 and the logging device 31. The logging target control data 14 written in the shared memory 21 can be written into the internal memory 32 in the logging device 31 by the logging execution unit 33.

  In the logging system according to the present embodiment as described above, by executing the above-described processing, the logging device 31 does not issue a logging processing request to the control device 11, and synchronizes with the control cycle. The control data 14 can be collected in the internal memory 32 in the logging device 31 every control cycle. That is, in the logging system according to the present embodiment, the shared memory 21 for time series buffering of the control data 14 is provided between the control device 11 and the logging device 31, and the control data 14 of the control device 11 is temporarily stored. The control data 14 stored in the shared memory 21 and stored in the shared memory 21 is taken into the logging device 31 and stored.

  Thereby, the logging device 31 can acquire the control data 14 efficiently and at high speed at an arbitrary timing, and can realize logging for each control cycle even when the control cycle of the control device 11 is short. Further, the logging device 31 can acquire the control data 14 that is the logging target in the control device 11 without affecting the control operation of the control device 11 during the logging process.

  Further, in the logging system according to the present embodiment, since the logging process request is not used, it is possible to prevent the control data 14 from being overlooked due to the waiting for the logging process request from the logging apparatus 31 due to the priority of the control process of the control apparatus 11.

  When the logging device 31 acquires the control data 14, the control device 11 does not need to perform a response process to the data acquisition request from the logging device 31. Does not affect the execution of control functions.

  In the logging system according to the present embodiment as described above, the logging execution unit 33 of the logging device 31 does not need to perform a high-speed operation as compared with the control cycle of the control execution unit 13 of the control device 11, The logging device 31 can be realized by a hardware configuration having performance equivalent to or lower than that of the control device 11.

  If the logging device 31 has a function that can be executed by the control device 11 and automatically generates a program for the control device 11 to push the control data 14, the control device 11 has a dedicated function for collecting data. No need to equip any hardware or software. In addition, it is not necessary to create a program each time the control data to be logged or the logging conditions are changed. With regard to the operation of the logging system, physical costs and human costs can be suppressed.

  Further, when a means for detecting / notifying that the control data 14 cannot be acquired every control cycle is provided, it is detected / notified that the logging of the control data has been lost due to a device failure or an overload, and the user Can be notified.

  Further, there are designated information for specifying control data to be logged, a logging setting tool 42 for setting logging condition information for specifying logging conditions, and means for generating a program executable by the control device from these pieces of information. When a certain generation unit 34 is provided, the user can easily change the control data to be logged and the logging conditions.

  As described above, the logging system according to the present invention controls the control data (input / output data and internal data) of the control device in order to monitor and analyze the operation state of the control device such as the programmable controller (PLC) and the state of the control target. This is useful for logging systems that perform logging processing.

It is a figure showing a schematic structure of a logging system concerning an embodiment of the invention. It is a flowchart which shows the setting method of the logging parameter which sets the control data in the control apparatus used as the object of the logging process in the logging system concerning this embodiment of this invention. 4 is a flowchart for explaining processing in which a control device writes control data to a shared memory in the logging system according to the embodiment of the present invention. 6 is a flowchart for explaining a process in which a logging execution unit acquires control data from a shared memory and writes it to an internal memory in the logging system according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Control apparatus 12 Control program 13 Control execution part 14 Control data 15 Data collection part 21 Shared memory 31 Logging apparatus 32 Internal memory 33 Logging execution part 34 Generation part 41 Personal computer 42 Logging setting tool 43 Communication cable 51 Internal bus

Claims (5)

A control device for executing predetermined control and holding data related to the control;
A storage device that is connected to the control device in an accessible manner, and stores data held by the control device in time series;
A logging device that is connected to the storage device so as to be accessible and reads and logs the data stored in the storage device;
With
The control device includes:
A function unit that acquires the data stored in the control device, sends the data to the storage device, and writes the data;
The storage device
A storage area for storing the data written by the functional unit in a ring buffer format in a time series,
A writing position area for storing writing position information indicating a position where the data is written in the previous writing process to the storage area by the functional unit;
A read position area for storing read position information indicating a position where the data is read in the previous read process from the storage area by the logging device;
Have
The functional unit obtains the write position information and the read position information from the storage device when the data is written to the storage area, collates the information, and if the information matches, When the acquisition of data is stopped and these pieces of information do not match, the data is recorded at a position next to the position indicated by the write position information in the storage area,
A logging system, wherein push-type logging is performed from the control device to the logging device via the storage device. The logging apparatus, logging system of claim 1, the pre-Symbol function unit, characterized in that it automatically created in the control device. The logging device is
A means for setting or changing specification information for specifying data to be logged;
Means for automatically creating the functional unit in the control device based on the set or changed designation information;
The logging system according to claim 2, further comprising: The logging system according to claim 2, wherein the functional unit is automatically generated as a program executable by the control device. The logging system according to claim 1, further comprising means for detecting and notifying that the data cannot be acquired every control cycle.

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