WO2015189969A1

WO2015189969A1 - Logging system, logging device, and data logging method

Info

Publication number: WO2015189969A1
Application number: PCT/JP2014/065651
Authority: WO
Inventors: 祥彦森
Original assignee: 三菱電機株式会社
Priority date: 2014-06-12
Filing date: 2014-06-12
Publication date: 2015-12-17
Also published as: TWI557558B; CN106663048A; JP6053996B2; JPWO2015189969A1; CN106663048B; TW201610671A

Abstract

A logging device is provided with: a common timer (111) of which the time is corrected in synchronism with an external standard time; an absolute time timer (110) for which no time correction is made after the time thereof is corrected in synchronism with the time of the common timer (111) at the time of start-up of the logging device (100); an internal memory (103) that stores control data acquired from a plurality of control devices (10) for each of the control devices (10); a data acquisition unit (102) that acquires the control data from the plurality of control devices (10) at respectively predetermined collection time intervals, and stores the control data in the internal memory (103) with the time of the common timer (111) and the time of the absolute time timer (110) at the time of data acquisition attached to each item of the control data; and a control data arranging unit (108) that rearranges and combines the control data of the plurality of control devices (10) in chronological order of acquisition of the control data from the control devices (10), wherein the control data arranging unit (108) rearranges and combines the control data of the plurality of control devices (10) in chronological order with reference to the time of the absolute time timer (110) as attached to the control data stored in the internal memory (103).

Description

Logging system, logging device, and data logging method

The present invention relates to a logging system, a logging device, and a data logging method.

In the logging system, control data is collected from the control device by the logging device. The logging data, which is the collected control data, is stored in a file with a time stamp added. When there are a plurality of control devices, the interval at which the logging device collects data from each control device can be individually designated for each control device. Then, the logging device collects data from each control device at specified intervals, and outputs the collected logging data to a file (see, for example, Patent Document 1).

At this time, in order to unify the clock of the entire logging system, the time stamp added to the logging data is based on the common timer provided in the logging device. The common timer synchronizes with the standard time of the external system and corrects the clock in order to correctly grasp the time when the logging data is collected from each control device. In addition, since the clock element of the logging device is different from the clock element of the external system, the correction of the clock of the common timer needs to be performed periodically to prevent time lag.

By performing such processing, it is possible to display production information for each time series by collecting data collected from the control device and comparing time stamps.

JP 2012-159942 A International Publication No. 01/020456

However, when the common timer value is advanced from the standard time of the external system when the clock is corrected by inquiring the common timer to the external system, the clock time of the common timer may rewind. When the clock time of the common timer is rewound, the time stamp added to the logging data may be older than or the same time as the time stamp already issued.

In order to display the operating status of each control device collectively, it is necessary to rearrange the logging data based on the time stamp. However, when the clock of the common timer is corrected by time synchronization, there is no guarantee that the time stamps of the logging data collected by each control device are in chronological order. There was a problem that it was not possible.

Also, when sorting the logging data, by specifying a reference interval, the data of each device can be collected side by side with a time stamp for each interval. However, if all the data collection cycles for the target control devices are not the same, time stamps with no logging data frequently occur, and the output data becomes information indicating “NULL” or “no data”. End up. For this reason, when the collected data is visualized with a trend graph or the like, logging data may not be displayed in a portion without data.

In addition, as means for guaranteeing operating time-series data, there is means for adding a counter value that counts up every time a time is added to operation trace information together with a time stamp (for example, see Patent Document 2). However, in this case, when it is desired to display the data of only an arbitrary control device among a plurality of control devices at once, in order to know before and after the counter value, information on all the control devices must be examined. For this reason, as the scale of the control device increases, more time and effort are required.

The present invention has been made in view of the above, and in a logging system in which data is collected from a target device by a logging device, the data of the target device can be easily and reliably rearranged in chronological order. An object is to obtain a logging system, a logging device, and a data logging method.

In order to solve the above-described problems and achieve the object, a logging system according to the present invention collects and records a plurality of target devices as data collection targets and data in the target devices from the plurality of target devices. A logging system configured to include a first clock whose time is corrected in synchronization with an external standard time at a predetermined timing, and when the logging device is activated, the logging system After the time is corrected in synchronization with the time of the first clock, a second clock that is not corrected for time during operation of the logging device, and the data acquired from the plurality of target devices for each target device The data storage unit for storing data and the plurality of target devices respectively acquire the data at predetermined collection time intervals, and acquire the data from the target device for each data A data acquisition unit that adds the time of the first clock and the time of the second clock to be stored in the data storage unit, and the data of the plurality of target devices stored in the storage unit, A data alignment unit that rearranges and combines the data in order of time series acquired from the target device; and a combined data storage unit that stores the combined data, and the data alignment unit stores the data in the storage unit The data of the plurality of target devices is rearranged in order of the time series based on the time of the second clock added to the data that has been added, and combined.

According to the present invention, in the logging system in which data is collected from the target device by the logging device, there is an effect that the data of the target device can be easily and reliably rearranged in chronological order.

FIG. 1 is a diagram showing a configuration of a logging system according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining processing for writing clock data to the common timer of the logging device according to the embodiment of the present invention. FIG. 3 is a flowchart showing a data acquisition processing procedure of the data acquisition unit in the logging device according to the embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration example for collecting control data from a plurality of control devices in the logging system according to the embodiment of the present invention. FIG. 5 is a flowchart for explaining processing in which the logging device rearranges and combines the control data in the logging system according to the embodiment of the present invention. FIG. 6 is a diagram showing control data in the logging device according to the embodiment of the present invention. FIG. 7 is a diagram illustrating control data when equivalent data interpolation is performed on deficient data in the logging device according to the embodiment of the present invention. FIG. 8 is a diagram illustrating a file that is output when the deficient data is subjected to the same value interpolation in the logging device according to the embodiment of the present invention. FIG. 9 is a diagram showing control data when the deficient data is linearly interpolated in the logging device according to the embodiment of the present invention. FIG. 10 is a diagram illustrating file data output to the storage medium when the deficient data is linearly interpolated in the logging device according to the embodiment of the present invention. FIG. 11 is a block diagram schematically illustrating an example of a configuration of a computer device that realizes functions as a control device, a server personal computer, a personal computer, and a logging device.

Hereinafter, embodiments of a logging system, a logging apparatus, and a data logging method 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 1 FIG.
FIG. 1 is a diagram showing a configuration of a logging system according to the first exemplary embodiment of the present invention. As shown in FIG. 1, the logging system according to the present embodiment logs a control device 10 that performs a calculation for executing a predetermined control on a controlled device (not shown) and the acquired control data. The system includes a logging device 100, a storage medium 50 mounted on the logging device 100, a personal computer 40 for setting logging parameters, and a server personal computer 30 for time synchronization. The control device 10 and the logging device 100 are connected to each other via the bus 20. The personal computer 40 and the server personal computer 30 are connected to the logging device 100 via a cable 60 such as Ethernet (registered trademark). The server personal computer 30 is connected to the control device 10 via a cable 60. In addition, the arrow shown in FIG. 1 has shown the motion of the data of the control apparatus which is data for logging.

The control device 10 includes a control execution unit 12, a control data storage unit 15, a control data transfer unit 16, a communication unit 17, and a CPU 11 that operates them. The control execution unit 12 includes a control program 13 for the control device 10 to execute control on the controlled device, performs an operation according to the control program 13, operates the control device 10, and controls the controlled device. Do. The control data storage unit 15 stores and holds the control data 14 generated when the control device 10 executes control on the controlled device.

The control data transfer unit 16 transfers the value of the control data 14 in the control data storage unit 15 to the shared memory 105 provided in the logging device 100 at a predetermined constant cycle or the operation cycle of the control program, and transfers the control data 14 to the shared memory 105. To the logging device 100. That is, the logging device 100 acquires the control data 14 at a predetermined fixed interval or an operation interval of the control program. The control data transfer unit 16 transfers the control data 14 in chronological order in which the control data 14 is generated. The communication unit 17 performs communication with an external device.

The personal computer 40 includes a logging setting tool 41 and a communication unit 42 implemented by software. The logging setting tool 41 has a function of creating setting data for logging and setting the setting data in the logging device 100. The setting data relates to the setting contents such as the number and type of data collected by the logging device 100 from the control device 10, the data collection cycle, the logging execution condition, the setting for combining the data, the data interpolation method, and the time synchronization timing. It is data. Therefore, the personal computer 40 functions as a logging setting data creation / setting device. The communication unit 42 communicates with an external device.

The detailed configuration of the computer device constituting the personal computer 40 will be described later. The personal computer 40 may be configured by a dedicated device having the above functions. The personal computer 40 is necessary for setting the created setting data in the logging device 100, and the connection with the logging device 100 may be disconnected while the logging device 100 is in operation.

The server personal computer 30 includes a time distribution unit 31 that operates as an SNTP server and distributes the time of the server personal computer 30 to the SNTP client, and a communication unit 32. When receiving a time synchronization request from the SNTP client, the time distribution unit 31 distributes time information. The SNTP client here is the logging device 100 and the control device 10. The communication unit 32 communicates with an external device. The detailed configuration of the computer device constituting the personal computer 40 will be described later. The server personal computer 30 may be configured by a dedicated device having an SNTP function.

The logging device 100 includes a CPU 101, a data acquisition unit 102, an internal memory 103, a data storage unit 104, a shared memory 105, a combined file creation unit 107, an absolute time timer 110, a common timer 111, and time synchronization. A request unit 112 and a communication unit 115 are provided.

The common timer 111 is a clock provided to unify the clock of the entire logging system. The common timer 111 is synchronized with the time of the server personal computer 30. The time stamp added to the control data is based on the value of the common timer 111.

The absolute time timer 110 synchronizes the time with the common timer 111 and corrects the clock once after the logging device 100 is powered on. After that, the absolute time timer 110 is not affected by the synchronization when the common timer 111 performs clock correction with the server personal computer 30, that is, when the common timer 111 synchronizes the time with the server personal computer 30. Continue to update the value. In other words, the absolute time timer 110 is a clock that continues to update the absolute time that is not corrected until the logging device 100 is turned off after the time is synchronized with the common timer 111 immediately after the logging device 100 is powered on. . The absolute time timer 110 includes the same timepiece element as the common timer 111, for example. The absolute time data added to the control data is based on the value of the absolute time timer 111.

The time synchronization request unit 112 acquires time information from the server personal computer 30 by issuing a time synchronization request and transmitting it to the server personal computer 30. Then, the time synchronization request unit 112 updates the time of the common timer 111 by setting and reflecting the acquired time information in the common timer 111. That is, the time synchronization request unit 112 executes a time synchronization request to the server personal computer 30 according to the time synchronization period of the setting data set from the personal computer 40. Then, the time synchronization request unit 112 writes the time information acquired as a result of executing the time acquisition request in the common timer 111.

The shared memory 105 has an area for temporarily storing the control data 14 transferred from the control device 10 as the control data 106. The shared memory 105 has one area for each control device 10 in which only the control data 106 for one control cycle is stored in the shared memory 105. The shared memory 105 can be accessed from both the control device 10 and the logging device 100. Further, the shared memory 105 can divide the memory area in order to store the control data 106 according to the number of control devices 10 to be logged.

The internal memory 103 is a control data storage unit that collectively stores the control data 106 transferred from the control device 10. As the internal memory 103, for example, a volatile memory is used. The internal memory 103 is accessible from the data acquisition unit 102, the data storage unit 104, and the combined file creation unit 107. The internal memory 103 includes, for example, a ring buffer area 113 that can store a large number of control data transferred from the control device 10 for a predetermined control period, and a logging parameter 114.

The ring buffer area 113 is a RAM memory or the like having a sufficient capacity for storing the control data 106. The ring buffer area 113 is conceptually arranged in a circular memory configuration and is managed by a write pointer and a read pointer. In this case, when the data acquisition unit 102 writes the control data 106 in the ring buffer area 113, the write pointer advances. When the data storage unit 104 reads the control data 106 written in the ring buffer area 113, the read pointer advances. The read pointer can read control data up to the position of the write pointer.

In addition to the control data described above, the ring buffer area 113 includes the time stamp issued from the common timer 111 and the absolute time data issued from the absolute time timer 110 in the order of time series obtained from the control device 10. Remember. For example, the time stamp from the common timer 111 is recorded as time stamp (1), time stamp (2),..., Time stamp (m), time stamp (n). The numbers in parentheses indicate the order in which each time stamp is stored in the ring buffer area 113. Here, time stamp (1) is the oldest time in time series, and time stamp (n) is the newest time in time series.

Similarly, the absolute time data issued from the absolute time timer 110 includes absolute time data (1), absolute time data (2),..., Absolute time data (m), and absolute time data (n). As recorded. The numbers in parentheses indicate the order in which each absolute time data is stored in the ring buffer area 113. Here, the absolute time data (1) is the oldest time in the time series order, and the absolute time data (n) is the newest time in the time series order. In the ring buffer area 113, for example, as shown in FIG. 1, control data (n), a time stamp (n) of the control data, and absolute time data (n) are stored in this order.

The logging parameter 114 has a logging condition that specifies control data to be logged, a cycle for performing logging, and the like. The logging parameter 114 is set from setting data set from the personal computer 40.

The data acquisition unit 102 adds a time stamp and absolute time data to the control data 106 collected from the control device 10 and stored in the shared memory 105, and writes it in the internal memory 103. The data acquisition unit 102 operates by receiving a notification of writing of the control data 14 transmitted from the control data transfer unit 16 when the control data transfer unit 16 of the control device 10 writes the control data 14 to the shared memory 105. The control data 106 of the shared memory 105 is read. Then, the data acquisition unit 102 adds a time stamp and absolute time data to each of the read control data 106 and writes it in the ring buffer area 113 of the internal memory 103.

That is, the data acquisition unit 102 acquires the time stamp from the common timer 111 and the absolute time data from the absolute time timer 110 when writing the control data 106 to the ring buffer area 113 of the internal memory 103. The data acquisition unit 102 adds the acquired time stamp and absolute time data to the control data 106, and writes the control data, time stamp, and absolute time data in the ring buffer area 113 as one unit.

The data storage unit 104 reads out and stores the control data collectively stored in the internal memory 103 and the time stamp and absolute time data corresponding to the control data. The data storage unit 104 stores the combined control data created by the combined file creation unit 107, the time stamp corresponding to the control data, and absolute time data. That is, the data storage unit 104 has a function as a combined data storage unit.

The data storage unit 104 writes these control data in the storage medium 50 together with a time stamp. The data storage unit 104 reads control data from the ring buffer area 113 in the internal memory 103 according to the read pointer according to the logging execution condition specified in the logging parameter 114, and writes the read control data to the storage medium 50. In addition, the data storage unit 104 writes the combined control data rearranged and combined by the combined file creation unit 107 in the storage medium 50 together with the time stamp. The data storage unit 104 stores the control data of the internal memory 103 and the time stamp in the storage medium 50, but does not store the absolute time data in the storage medium 50.

The data storage unit 104 can process and write the control data when writing the control data to the storage medium 50. As processing of the control data, for example, processing by four arithmetic operations, processing of converting binary data into character string type data, and the like can be performed.

The combined file creation unit 107 rearranges and combines the control data acquired from the plurality of control devices 10, creates combined control data, and outputs the combined control data as a file to the data storage unit 104. The combined file creation unit 107 includes a control data alignment unit 108 and a control data interpolation unit 109. The control data alignment unit 108 reads the control data collected from the plurality of control devices 10 and collected in the internal memory 103, and combines the read control data according to the setting specified by the logging parameter 114. The combined control data rearranged and combined by the combined file creation unit 107 is stored in the data storage unit 104 and written from the data storage unit 104 to the storage medium 50.

The rearrangement and combination of control data can be specified in a setting unit for collecting control data from each control device 10. That is, when the collected control data of each control device 10 is rearranged, a reference interval can be specified in the logging parameter 114. As this interval, the data collection interval of the control device 10 can be designated. Then, in accordance with the data collection interval of a certain control device, the control data acquired from the control device 10 is rearranged in order of time series and combined. The rearrangement of the control data is performed based on the value of the absolute time data.

In addition, when the control data is combined, the control data is collected when the control data is rearranged in accordance with the control data collection time interval of one control device 10 among the control data of the plurality of control devices 10. In the control data of another control device 10 having a different cycle from this control device, there may be no control data corresponding to the time stamp and the absolute time data. In this way, when there is a time stamp and absolute time data in which no data exists in the control data of a certain control device 10, the control data interpolation unit 109 sets the control data according to the setting specified by the logging parameter 114. Perform interpolation.

The storage medium 50 is an external storage means attached to the logging device 100, and is, for example, a compact flash (registered trademark) card. The storage medium 50 stores the control data of the internal memory 103 and the time stamp together, but does not store absolute time data.

The communication unit 115 communicates with an external device. The CPU 101 is a control unit that controls the overall operation of each unit in the logging device 100.

Next, a time synchronization processing procedure in the logging device 100 according to the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart for explaining processing of writing clock data to the common timer 111 of the logging device 100 according to this embodiment.

First, since the common timer 111 is in an initial state when the logging device 100 is activated, initialization is performed. The initialization of the common timer 111 is performed by the time synchronization request unit 112 writing and reflecting the time of the time information acquired from the time distribution unit 31 of the server personal computer 30 in the common timer 111. Thereby, the time of the common timer 111 is synchronized with the time of the server personal computer 30, and the common timer 111 is initialized.

The time synchronization request unit 112 acquires time information from the control device 10 via the bus 20 when the time synchronization of the common timer 111 due to acquisition of time information from the time distribution unit 31 of the server personal computer 30 fails. Then, the time of the time information of the control device 10 is written in the common timer 111 and reflected. Thereby, the time of the common timer 111 is synchronized with the time of the control device 10, and the common timer 111 is initialized.

After initialization of the common timer 111, the time synchronization request unit 112 operates in a predetermined operation cycle according to the setting specified by the logging parameter 114, and performs the operation of the flowchart of FIG.

That is, the time synchronization request unit 112 acquires time from the common timer 111 when the operation is started (step S110). Next, the time synchronization request unit 112 determines whether or not the acquired time satisfies a condition for performing time synchronization specified in the logging parameter 114, that is, whether it is time to perform time synchronization (step). S120). When the acquired time is not the time for performing time synchronization (No at Step S120), the time synchronization request unit 112 returns to Step S110 and continues the process.

If the acquired time is the time for performing time synchronization (step S120, Yes), the time synchronization request unit 112 starts time synchronization processing. In the time synchronization process, the time synchronization request unit 112 issues a time synchronization request and transmits it to the server personal computer 30 (step S130). Then, the time synchronization request unit 112 determines whether or not the time has been acquired from the time distribution unit 31 of the server personal computer 30 (step S140).

When the time can be acquired from the time distribution unit 31 of the server personal computer 30 (step S140, Yes). The time synchronization request unit 112 writes the time of the acquired time information in the common timer 111 and updates the time of the common timer 111 (step S150). Then, the time synchronization request unit 112 ends the series of synchronization processes of the common timer 111.

On the other hand, when the time cannot be acquired from the time distribution unit 31 of the server personal computer 30 (No at Step S140), the time synchronization request unit 112 determines whether or not the time synchronization request time-out period has elapsed (Step S140). S160). If the time synchronization request time-out period has elapsed (step S160, Yes), the time synchronization request unit 112 records time synchronization failure information in the time synchronization request unit 112, and performs a series of common timer 111 synchronization processes. finish.

On the other hand, when the timeout time of the time synchronization request has not elapsed (step S160, NO), the time synchronization request unit 112 returns to step S130 and reissues the time synchronization request at the timing specified in the logging parameter 114. And send.

Next, the data acquisition processing procedure of the data acquisition unit 102 in the logging device 100 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing a data acquisition processing procedure of the data acquisition unit 102 in the logging device 100.

After the logging device 100 is activated and the common timer 111 is initialized, the control data transfer unit 16 stores the control data storage unit 15 in the shared memory 105 provided in the logging device 100 at a predetermined constant cycle or an operation cycle of the control program. The control data 14 value is transferred, and a control data write notification is transmitted to the data acquisition unit 102 of the logging device 100.

The data acquisition unit 102 receives the control data write notification transmitted from the control data transfer unit 16 of the control device 10 and starts the storage process of the control data. The data acquisition unit 102 first determines whether or not there is a control data write notification, that is, whether or not a control data write notification has been received from the control data transfer unit 16 of the control device 10 (step S210).

When there is no notification of writing control data, that is, when a notification of writing control data is not received from the control data transfer unit 16 of the control device 10 (No in step S210), the data acquisition unit 102 has a notification. Step S210 is repeatedly performed.

On the other hand, when there is a notification of writing of the control data 14, that is, when a notification of writing of the control data 14 is received from the control data transfer unit 16 of the control device 10 (Yes in step S210), the data acquisition unit 102 It is determined whether or not there is free space in the ring buffer area 113 of the internal memory 103 (step S220). If there is no free space in the ring buffer area 113 (No in step S220), the data acquisition unit 102 returns error information to the control device 10 and ends the series of control data storage processing.

On the other hand, when there is free space in the ring buffer area 113 (step S220, Yes), the data acquisition unit 102 copies the control data 106 of the shared memory 105 to the ring buffer area 113 (step S230). Next, the data acquisition unit 102 copies the value of the common timer 111, that is, the time, to the ring buffer area 113 and adds it as a time stamp to the control data 106 previously copied to the ring buffer area 113 (step S240). Further, the data acquisition unit 102 copies the value of the absolute time timer 110, that is, the time to the control data 106 to which the time is copied to the ring buffer area 113, and is first copied to the ring buffer area 113 and added with the value of the common timer 111. It is added as time data (step S250).

In this way, the control data (1), the time stamp (1) of the control data (1), the absolute time data (1), the control data (2), and the time stamp of the control data ( The control data, time stamp, and absolute time data are stored in the order of time series in the order of 2) and absolute time data (2). Then, when the data copy is completed, the data acquisition unit 102 advances the write pointer in the ring buffer area 113 and ends the series of control data storage processing.

The data storage unit 104 reads the data stored in the ring buffer area 113 in order from the read pointer until it reaches the position of the write pointer, and outputs it to a file. At this time, the data storage unit 104 outputs control data and a time stamp, but does not output absolute time data.

Next, the flow of control data rearrangement and combination processing acquired from a plurality of control devices 10 in the combined file creation unit 107 of the logging device 100 according to the present embodiment will be described with reference to FIGS. 4 and 5. To do. FIG. 4 is a diagram illustrating a configuration example of collecting control data from a plurality of control devices in the logging system according to the embodiment. FIG. 5 is a flowchart for explaining processing in which the logging device 100 rearranges and combines control data in the logging system according to the embodiment.

Here, the control data A collected from the control device A 10A and the control data B collected from the control device B 10B are stored in the ring buffer area 103 of the internal memory 103 of the logging device 100 with a time stamp and absolute time data added. . In FIG. 4, “A” is added to the end of the code of the element related to the control data of the control device A 10 </ b> A, and “B” is added to the code of the element related to the control data of the control device B 10 </ b> B. In FIG. 4, the flow of control data is shown with attention, and illustration of a part of the configuration is omitted.

In the control data combining process, the control data aligning unit 108 reads out and obtains the rearrangement reference setting in which the control data rearrangement reference is set from the logging parameter 114 (step S310). Here, a case will be described in which the control data collected from the control device A 10A and the control device B 10B are rearranged and combined based on the control data A, that is, based on the collection time interval of the control data A. Therefore, the rearrangement reference setting here is set information using the collection time interval of the control data A as a reference for rearrangement.

Next, the control data alignment unit 108 converts the data stored in the ring buffer area 113 from the plurality of ring buffer areas 113 storing the control data to be rearranged according to the rearrangement reference setting. All are read for each area 113 (step S320). For example, the control data alignment unit 108 reads all the data stored in the ring buffer area A113A. Next, the control data alignment unit 108 reads all the data stored in the ring buffer area B113B.

FIG. 6 is a diagram showing control data in the logging device according to the present embodiment. FIG. 6A shows the control data A acquired from the control device A and stored in the ring buffer area A113A, and the time stamp and absolute time data added to the control data A. FIG. 6B shows the control data B acquired from the control device B and stored in the ring buffer area B113B, and the time stamp and absolute time data added to the control data B. FIG. 6C shows control data in which the control data A and the control data B are rearranged based on the control data A as a reference.

For example, in the ring buffer area A113A, as the control data A acquired from the control device A, the control data A (1) to control data A (n) shown in FIG. Stored with time data. The numbers in parentheses indicate the order in which each control data A is stored in the ring buffer area A113A. Further, for example, the control data B (1) to control data B (n) shown in FIG. 6B are respectively stored in the ring buffer area B113B as the control data B acquired from the control device B. And stored with absolute time data. The numbers in parentheses indicate the order in which each control data B is stored in the ring buffer area B113B.

As the control data A (n), as shown in FIG. 6A, the data as the control data A (1): 1, the data as the control data A (2): 2,... Data as 8): 8 is stored. In the logging device 100, the synchronization process with the server personal computer 30 of the common timer 111 is performed again after 14:10:03 in the absolute time data has elapsed. Therefore, the time stamps of the control data A (3): 3 and the control data A (4): 4 are reversed, and the time between the control data A (3): 3 and the control data A (5): 5 is reversed. The stamp time is the same.

On the other hand, the time of the absolute time timer 110 is not corrected after the time synchronization with the common timer 111 is performed immediately after the logging device 100 is activated. For this reason, the absolute time data of the absolute time timer 110 maintains the time-series order in the order in which the control data A is stored in the ring buffer area A 113A as shown in FIG. Further, the time interval for collecting the control data A is 1 second.

On the other hand, as the control data B (n), as shown in FIG. 6B, the data: 100 as the control data B (1), the data: 150 as the control data B (2), the control data B (3 ): 200 is stored. In the control data B, as shown in FIG. 6B, there is no control data B in which the time of the time stamp is reversed or the same, but the data collection time interval is different from the control data A. The cycle is 3 seconds.

Next, the control data sorting unit 108 performs the processing corresponding to the following steps S350 to S370 by the number of control data rearrangement target settings, that is, the number of control devices 10 to which the control data is to be rearranged. (Step S330a: start, step S330b: end). Further, in the repetition of the processes in steps S330a to S330b, the processes corresponding to the following steps S350 to S370 are repeated for the number of control data acquired from one control apparatus 10 (step S340a: start, step S340b: End).

The control data alignment unit 108 reads the absolute time data value from the data read from the plurality of ring buffer areas 113 in step S320, and determines whether there is control data that matches the absolute time data value (step S320). S350). If there is control data that matches the absolute time data value (step S350, Yes), the control data value is acquired and recorded in the control data alignment unit 108 (step S360). Here, since the time interval for collecting the control data A is used as a reference, that is, the absolute time data that matches the time interval for collecting the control data A is used as a reference, the same absolute time as the absolute time data of the control data A is used. The value of the control data B to which the data has been added is acquired and recorded in a table as shown in FIG.

On the other hand, if there is no control data having the same absolute time data value (step S350, No), information “no data” is recorded in the control data column in the control data alignment unit 108 (step S370). Here, since the time interval for collecting the control data A is used as a reference, that is, the absolute time data that matches the time interval for collecting the control data A is used as a reference, the same absolute time as the absolute time data of the control data A is used. When there is no control data B to which data is added, for example, information “no data” is recorded in the control data B column of the table as shown in FIG.

Then, the processing from step S350 to step S370 is repeated as many times as the number of control data acquired from one control device 10 (step S340a: start, step S340b: end), and the control data rearrangement is performed for the number of target settings. That is, the control data is repeated by the number of control devices 10 to be rearranged (step S330a: start, step S330b: end). Then, the process ends when the end condition is satisfied.

As a result of the rearrangement of the control data, the control data that is the source of the file output to the data storage unit 104 is as shown in FIG. In this case, even if the time of the common timer 111 has been rewound by the time synchronization processing with the server personal computer 30, the control data is aligned based on the absolute time data of the absolute time timer 110, thereby controlling the The control data is arranged in the time series order in which the control data is acquired from the apparatus 10, that is, in the time series order in which the control data is generated in the control apparatus 10.

The control data rearranged and combined in this way is stored as a file in the data storage unit 104 and output to the storage medium 50 as a file. However, when the file is output to the storage medium 50, the value of the absolute time timer is not output. Since the absolute time timer value is not output, the file capacity can be prevented from increasing, and an increase in capacity burden on the storage medium 50 can be prevented.

On the other hand, since the time stamp of the common timer 111, which is the result of time synchronization, is also output to the file output to the storage medium 50, the control device 10 indicates what data was collected at what time. It can be checked against the clock of the external device.

Further, as a result of the above rearrangement, when there is no control data having the same absolute time data value, or when there is absolute time data in which “no data” is recorded, the control data interpolation unit 109 displays the absolute time data. Interpolate the deficient control data corresponding to. The interpolation of the control data is performed only when there are two or more control data of the target setting. When two or more control data items to be set do not exist, the control data interpolation unit 109 outputs a fixed value set in advance in the logging parameter 114. Further, when a fixed value is not set in advance in the logging parameter 114, the control data interpolation unit 109 outputs 0.

Next, the control data interpolation method when there is no control data with the same absolute time data value as a result of the rearrangement, and there is absolute time data recorded with “no data” will be described. When, for example, equivalent interpolation is specified in the logging parameter 114 as the data interpolation method, the control data interpolation unit 109 outputs the same value as the control data recorded before the control data to be interpolated. When the rearrangement data shown in FIG. 6C is interpolated, the same value as the control data recorded immediately before in the control data B is output. In this case, the finally obtained connection control data is as shown in FIG. Further, FIG. 8 shows the data when the finally completed connection control data combined and interpolated is stored in the data storage unit 104 and then output to the storage medium 50 as a file. FIG. 7 is a diagram showing control data when the deficient data is subjected to equivalence interpolation in the logging device 100 according to the present embodiment. FIG. 8 is a diagram illustrating file data output to the storage medium 50 when the deficient data is subjected to equivalence interpolation in the logging device 100 according to the present embodiment.

In FIG. 7, “100” is interpolated as the control data B corresponding to the absolute time data “14:10:02”. “100” is interpolated as the control data B corresponding to the absolute time data “14:10:03”. As control data B corresponding to the absolute time data “14:10:05”, “150” is interpolated. “150” is interpolated as the control data B corresponding to the absolute time data “14:10:06”. “200” is interpolated as the control data B corresponding to the absolute time data “14:10:08”.

Further, as shown in FIG. 8, the data when the file is output to the storage medium 50 is data obtained by omitting the absolute time data from the data shown in FIG. In addition, the format of the file output to the storage medium 50 includes information regarding the logging device in which the file output to the storage medium 50 including the combined control data is created. The format of the file output to the storage medium 50 is provided with a file header 120 as shown in FIG. 8, for example. The file header section 120 includes the logging device identification information, the output format of the time, and the combined information included in the file as information related to the logging device in which the file output to the storage medium 50 including the combined control data is created. Information for determining from which setting the control data is combined is included. For example, in FIG. 8, information of “logging device_X” is included as the identification information of the logging device, and X indicates the product type name of the logging device. Further, for example, in FIG. 8, information of “time stamp (hh: mm: ss)” is included as the time output format, that is, the time display format, and hh, mm, and ss are the times in the time stamp, respectively. , Minutes and seconds. Further, for example, in FIG. 8, the control device from which the combined control data is collected can be determined as information for determining from which setting the combined control data included in the file is the combined data. Information, that is, information of “control data A” and “control data B”, which is information for identifying the control device from which the data included in the combined control data is acquired, is included.

On the other hand, when, for example, linear interpolation is specified in the logging parameter 114 as the control data interpolation method, the control data interpolation unit 109 interpolates the control data to be interpolated using the following equation (1). That is, when (xi, yi) and (xi + 1, yi + 1) are known and the value satisfies xi ≦ x ≦ xi + 1, the value is obtained by the following equation (1).

y = yi + (yi + 1−yi) × (x−xi) ÷ (xi + 1−xi) (1)

The case where Formula (1) is applied to the rearranged data shown in FIG. 6C will be described. For example, when obtaining the control data B of the absolute time data “14:10:02”, if x = second (millisecond unit) and y = control data B,
y = 100 + (150-100) × (2000−1000) ÷ (4000−1000)
And y = 117. Similarly, when other control data is interpolated, the finally obtained combined data is as shown in FIG. In addition, the data when the combined data finally combined and interpolated is stored in the data storage unit 104 and then output as a file to the storage medium 50 is as shown in FIG. FIG. 9 is a diagram showing control data when the control data for the shortage is linearly interpolated in the logging device 100 according to the present embodiment. FIG. 10 is a diagram illustrating file data output to the storage medium 50 when the control data for the shortage is linearly interpolated in the logging device 100 according to the present embodiment.

In FIG. 9, “117” is interpolated as control data B corresponding to the absolute time data “14:10:02”. As the control data B corresponding to the absolute time data “14:10:03”, “133” is interpolated. As the control data B corresponding to the absolute time data “14:10:05”, “167” is interpolated. As the control data B corresponding to the absolute time data “14:10:06”, “183” is interpolated. As the control data B corresponding to the absolute time data “14:10:08”, “217” is interpolated.

Further, as shown in FIG. 10, the data when the file is output to the storage medium 50 is data obtained by omitting the absolute time data from the data shown in FIG.

In this way, by interpolating the shortage of control data B when gathered at each collection interval of the control device A, when the control data rearranged and gathered into a visually easy-to-view format such as a trend graph, the data Analysis becomes easy. Similarly, when collecting the control data collected from the plurality of control devices 10, by thinning out the desired control data, the rearranged control data is converted into a visually easy-to-view format such as a trend graph. Data analysis becomes easy. Since the collected control data can be rearranged and collected at the control data collection interval of the designated desired control device 10, analysis data based on the designated control device 10 can be acquired.

Next, the functions executed in the control device 10, the server personal computer 30, the personal computer 40, and the logging device 100 in the logging system according to the above-described embodiment are configured as a program storing the processing procedure of the function, As shown in FIG. 11, this program can be realized by executing it on a computer device having a CPU, a storage device and the like.

FIG. 11 is a block diagram schematically showing an example of the configuration of the computer device 200 that realizes the functions of the control device 10, the server personal computer 30, the personal computer 40, and the logging device 100 described above. As shown in FIG. 11, the computer device 200 includes a display device 201 such as an LCD (Liquid Crystal Display), an input device 202 such as a keyboard, a CPU 203 that performs an operation, a nonvolatile memory 204 such as a ROM (Read Only Memory), Volatile memory 205 such as RAM (Random Access Memory), display memory 206 that stores a display screen displayed on the display device 201, external memory interface 207 that is an interface with a removable external memory such as a flash memory, and external devices The communication interface 208 and the like for communicating with each other are connected via an internal bus 209.

Then, a program describing the processing procedure of the simulation method stored in the nonvolatile memory 204 is loaded into the volatile memory 205 and executed by the CPU 203. This program is recorded on a computer-readable recording medium such as a hard disk, CD (Compact Disk), ROM (Read Only Memory), MO (Magneto-Optical disk), DVD (Digital Versatile Disk or Digital Video Disk). Alternatively, this program can be distributed via a computer network communication line such as the Internet. In this case, the program is stored on the nonvolatile memory 204 from the information processing terminal connected via the communication interface 208.

As described above, in the logging system according to the present embodiment, the logging device 100 includes the common timer 111 whose time is corrected in synchronization with the standard time of the external server personal computer 30 at a predetermined timing, and the absolute time timer. 110. The absolute time timer 110 does not correct the time during the operation of the logging device 100 after the time is corrected in synchronization with the time of the common timer 111 immediately after the logging device 100 is powered on.

Further, when the logging device 100 collects control data from the control device 10, the time stamp from the common timer 111 and the absolute time data from the absolute time timer 110 are added to the control data and stored in the internal memory 103. . Then, the control data stored in the internal memory 103 is rearranged in the chronological order acquired from the control device 10 based on the value of the absolute time timer 110. As a result, even if there is a clock correction by time synchronization with the external standard time in the common timer 111, the collected data of the control device 10 can be rearranged in order of the collected time, and the operating status of each control device 10 can be easily set. In addition, the data can be collected in chronological order.

Thus, in the logging system according to the present embodiment, even when the time of the common timer 111 is rewound when synchronizing with the external standard time, the time of the absolute time timer that is not affected by the time synchronization. Is used as a sorting criterion. Thereby, it is possible to determine the time series order in which the control data is acquired from the control device 10 for the collected control data, and it is possible to determine the time series order in which the control data 14 is generated.

When outputting data, the time stamp of the common timer 111, which is the result of time synchronization, is output, so what data is collected at what time and the clock of the external device including the control device 10 You can check against

In the logging system according to the present embodiment, the reference interval can be specified in the logging parameter 114 when the collected control data of each control device 10 is rearranged. As this interval, the data collection interval of the control device 10 can be designated. As a result of rearranging the collected control data of each control device 10, when the time of absolute time data that does not have control data occurs, the control data that does not exist can be interpolated in the format specified in the logging parameter 114. As an interpolation format, approximate value interpolation such as linear interpolation and equivalence interpolation can be used.

Therefore, according to the logging system according to the present embodiment, there is an effect that the control data generated in the control device 10 can be easily and reliably rearranged in the order of the generated time series.

As described above, the logging system according to the present invention is useful for rearranging the control data generated by the control device easily and reliably in the order of the time series generated.

10 control device, 11 CPU, 12 control execution unit, 13 control program, 14 control data, 15 control data storage unit, 16 control data transfer unit, 17 communication unit, 20 bus, 30 server personal computer, 31 time distribution unit, 32 Communication unit, 40 personal computer, 41 logging setting tool, 42 communication unit, 50 storage media, 60 cable, 100 logging device, 101 CPU, 102 data acquisition unit, 103 internal memory, 104 data storage unit, 105 shared memory, 106 control Data, 107 Combined file creation unit, 108 Control data alignment unit, 109 Control data interpolation unit, 110 Absolute time timer, 111 Common timer, 112 Time synchronization request unit, 113 Ring buffer area, 114 b Ing parameters, 115 communication unit, 200 computer system, 201 display unit, 202 input unit, 203 CPU, 204 non-volatile memory, 205 a volatile memory, 206 display memory, 207 an external memory interface, 208 a communication interface, 209 an internal bus.

Claims

A logging system comprising a plurality of target devices that are data collection targets, and a logging device that collects and records data in the target devices from the plurality of target devices,
The logging device is
A first clock whose time is corrected in synchronization with an external standard time at a predetermined timing;
A second timepiece in which the time is not corrected during operation of the logging device after the time is corrected in synchronization with the time of the first timepiece when the logging device is activated;
A data storage unit for storing the data acquired from the plurality of target devices for each target device;
The data is acquired from each of the plurality of target devices at predetermined collection time intervals, and the time of the first clock and the time of the second clock when the data is acquired from the target device for each data is added. And a data acquisition unit to be stored in the data storage unit,
A data aligning unit that rearranges and combines the data of the plurality of target devices stored in the storage unit in the time-series order obtained by acquiring the data from the target device;
A combined data storage unit for storing the combined data;
With
The data sorting unit rearranges and combines the data of the plurality of target devices in the time series in reference to the time of the second clock added to the data stored in the storage unit;
A logging system featuring.
A logging device that is communicably connected to a plurality of target devices that control the target device, collects and records data in the target devices from the plurality of target devices,
A first clock whose time is corrected in synchronization with an external standard time at a predetermined timing;
A second timepiece in which the time is not corrected during operation of the logging device after the time is corrected in synchronization with the time of the first timepiece when the logging device is activated;
A data storage unit for storing the data acquired from the plurality of target devices for each target device;
The data is acquired from each of the plurality of target devices at predetermined collection time intervals, and the time of the first clock and the time of the second clock when the data is acquired from the target device for each data is added. And a data acquisition unit to be stored in the data storage unit,
A data aligning unit that rearranges and combines the data of the plurality of target devices stored in the storage unit in the time-series order obtained by acquiring the data from the target device;
A combined data storage unit for storing the combined data;
With
The data sorting unit rearranges and combines the data of the plurality of target devices in the time series in reference to the time of the second clock added to the data stored in the storage unit;
A logging device characterized by
The collection time interval is different between the plurality of target devices,
The data alignment unit is acquired from the plurality of target devices with reference to the time of the second clock added to the data acquired from any one of the plurality of target devices. Rearranging and combining the data in the chronological order;
The logging device according to claim 2.
The data alignment unit interpolates the data or thins out the data when the quantity of the acquired data is different among the plurality of target devices;
The logging device according to claim 3.
The combined data and the time of the first clock are output as a file to an external storage means other than the combined data storage unit,
The file includes information of the logging device on which the file was created;
The logging device according to any one of claims 2 to 4, wherein:
As the information of the logging device, the identification information of the logging device in which the file is created, the output format of the time of the first clock, and the target device from which the data included in the combined data is acquired are identified Information is included,
The logging device according to claim 5.
The target device is a control device for controlling a controlled device;
The data is control data generated when the control device controls the controlled device;
The logging device according to any one of claims 2 to 6, wherein:
A data logging method for collecting data in a plurality of target devices from the target device and recording the data in a logging device,
A first step of acquiring the data at predetermined collection time intervals from the plurality of target devices, respectively;
The target device is added to the data storage unit in the logging device by adding the time of the first clock and the time of the second clock when the data is acquired from the target device for each data to the acquired data. A second step of storing each time,
A third step in which the data of the plurality of target devices stored in the data storage unit are rearranged in order of the time series obtained from the target devices and combined;
A fourth step of storing the combined data for each target device in a combined data storage unit in the logging device;
Including
The first timepiece is a timepiece whose time is corrected in synchronization with an external standard time at a predetermined timing,
The second timepiece is a timepiece whose time is not corrected during operation of the logging device after the time is corrected in synchronization with the time of the first time when the logging device is activated,
In the third step, the data of the plurality of target devices are rearranged and combined in the time series based on the time of the second clock added to the data stored in the storage unit,
Data logging method characterized by
The collection time interval is different between the plurality of target devices,
In the third step, the time acquired from the plurality of target devices with reference to the time of the second clock added to the data acquired from any one of the plurality of target devices. Rearranging and combining the data in the chronological order;
The data logging method according to claim 8.
In the third step, when the quantity of the acquired data is different among the plurality of target devices, interpolation of the data or thinning of the data is performed.
The data logging method according to claim 9.
The target device is a control device for controlling a controlled device;
The data is control data generated when the control device controls the controlled device;
The data logging method according to any one of claims 8 to 10, wherein: