JP2006309315A - Data recorder, inspection device equipped with data recorder, and controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data recorder capable of reducing writing processing into a data recording means and increasing a writing-in data volume per one time to reduce writing-in overhead, and capable of securing sampling data with a large scale of record numbers by high speed sampling. <P>SOLUTION: This data recorder is provided with a data input means 1 for bringing in measured data, a data bus means 2 for transferring the measured data, the data recording means 4 for recording the measured data transferred via the data bus means 2, a data control means 3 for controlling data recording for recording the measured data into the data recording means 4, and a data buffering storage means including a buffer area 6 for accumulating temporarily the measured data. The data control means 3 accumulates temporarily the measured data in the buffer area 6 to be recorded finally into the data recording means 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a data recording apparatus for transferring and recording measurement data to be inspected or measured, and in particular, transfers measurement data from a data input means to a data recording means via a data bus means. The present invention relates to a data recording apparatus provided with a data control means for recording.
The present invention also relates to an inspection device (intelligent inspection unit) and a control device (FA devices such as a sequencer, motion controller, numerical control device, and robot) provided with the data recording device as described above.

2. Description of the Related Art Conventionally, a data recording apparatus that records a signal to be inspected and measured as measurement data in time series is well known.
In this type of conventional apparatus, an analog electrical signal to be inspected / measured is taken in via a data bus, AD-converted by a data input unit into digital data, transferred from the data input unit to the data recording unit, and recorded as data. It is to be recorded in the department.

  As a first conventional apparatus, a data recording apparatus in an intelligent inspection unit includes an AD board, a cPCI bus (compact PCI bus), and a memory, acquires AD data from the AD board via the cPCI bus, and stores the AD data in the memory. (For example, refer nonpatent literature 1).

In the first conventional apparatus described in Non-Patent Document 1, the current data value held by the AD board is acquired through the cPCI bus and stored in the memory under the control of the program. One point of data is acquired from the AD board with Get New Data [V] FB, and stored in the D device in a floating-point type.
Therefore, the number of data within the range allowed by the memory can be obtained, but the sampling period (measurement period) depends on the speed of the program, and the sampling period increases as the number of data channels (CH) increases. Become.

In addition, as a second conventional apparatus described in Non-Patent Document 1, a high-performance AD board is used to store data for a predetermined number of samples on the AD board, and after the acquisition is completed, via the cPCI bus Some have been proposed for storage in memory.
In this case, using the High-Speed DAQ FB, after acquiring 100 samples at 1 MHz, the acquired data is stored in the DBL device, and a maximum acquisition of 1 MHz can be realized. I can't.

As described above, the first and second conventional devices cannot meet the demand for realizing high-capacity sampling at high speed in any case.
For example, when a large-capacity storage medium (HDD) is added to the first conventional apparatus and acquisition data is stored in the HDD instead of the memory, the write time per HDD is long, so AD Compared to the case where the current value held by the board is acquired and stored in the memory, it takes a longer time to acquire the current value held by the AD board and store it in the HDD. As a result, The desired sampling period will not be in time.
Here, the time t (N) required to write N data to the HDD once can be expressed by the following equation (1).

  t (N) = δ × N + κ (1)

In equation (1), δ is the time required to write one piece of data to the HDD, and κ is the time required to write to the HDD once (regardless of the number of data) (overhead).
On the other hand, if the process of writing one piece of data to the HDD at a time is repeated, the total T of n writing times is expressed by the following equation (2).

  T = n × (δ × 1 + κ) (2)

  In the case of Expression (2), the overhead κ becomes a bottleneck.

  Similarly, when a large-capacity storage medium (HDD) is added to the second conventional apparatus and acquisition data is to be stored in the HDD, cPCI is performed after data acquisition for a predetermined number of samples is completed on the board. After the next data acquisition for a predetermined number of samples is completed on the board after being stored in the HDD via the bus, the data may be stored in the HDD via the cPCI bus. Between the predetermined sample number data above, the predetermined sample number data on the current board, the predetermined sample number data on the next board, and each of the predetermined sample number data to be repeated, There is no guarantee that it is continuously connected at a desired sampling period without missing.

Mitsubishi Intelligent Inspection Unit IU2 Series “Programming Examples” (created in January 2004), pages 175, 147

In the conventional data recording apparatus, for example, in the case of the first conventional apparatus, although the total number of data that can be acquired is larger than that in the second conventional apparatus, high-speed sampling with a short sampling period is performed as in the second conventional apparatus. There was a problem that it could not be done.
In addition, since only the number of data within the range allowed by the memory can be acquired, if the sampling period is shortened, the acquisition time is shortened, and in order to ensure a long acquisition time, the sampling period must be delayed, In particular, when the number of acquisition channels is increased, there is a problem that high-speed sampling becomes more difficult.

Further, in the case of the second conventional apparatus, the high-speed sampling can be performed as compared with the first conventional apparatus, but a large number of data cannot be acquired unlike the first conventional apparatus. was there.
Further, there is a problem that data acquisition is substantially impossible during data transfer after the end of sampling.

  The present invention has been made to solve the above-described problems. Even when a large-capacity storage medium (HDD) having a long data writing time is used, the number of acquisition points can be increased with a high-speed sampling cycle. An object of the present invention is to obtain a data recording apparatus capable of performing sampling in which large-scale (that is, long-term) sampling data is guaranteed to be continuously connected without being lost.

  A data recording apparatus according to the present invention records a data input means for taking a signal to be inspected or measured as measurement data, a data bus means for transferring measurement data, and measurement data transferred via the data bus means. Data buffer storage means including a buffer area for temporarily storing measurement data in a data recording apparatus comprising data recording means and data control means for performing data recording control for recording measurement data in the data recording means And the data control means performs data recording control so that the measurement data acquired from the data input means via the data bus means is temporarily stored in the buffer area, and finally recorded in the data recording means. Is what you do.

  According to the present invention, it is possible to increase the amount of data to be written per time by reducing the write processing itself to the large-capacity storage medium (HDD) having a long data write time, and relatively reduce the write overhead. Thus, even when an HDD is used, it is possible to perform sampling that is guaranteed to be continuously connected without missing large-scale sampling data having a large number of acquisition points at a high-speed sampling cycle.

Embodiment 1 FIG.
1 is a block diagram showing a data recording apparatus according to Embodiment 1 of the present invention.
In FIG. 1, the data recording apparatus is connected to the data input means 1, the data bus means 2, the data control means 3 connected to the data input means 1 via the data bus means 2, and the data control means 3. Data recording means 4 and data buffer storage means 5 are provided.

  The data input means 1 takes in a signal to be inspected or measured as measurement data and sends it to the data bus means 2 as necessary. Specifically, the data input means 1 is composed of an A / D board or the like, and takes in physical data to be measured and converts it into digital data.

  The data bus means 2 transfers the measurement data taken in via the data input means 1 to the data control means 3. Specifically, the data bus means includes a cPCI bus through which digital data passes, and functions when data is exchanged between the data input means 1 (for example, an A / D board) and the data control means 3. .

  The data control means 3 is composed of a CPU (MPU) and performs data recording control for recording measurement data in the data recording means 4. Specifically, the data control means 3 is composed of a program (F / W: firmware) that runs on the CPU (MPU), and instructs the data input means 1 (A / D board) to acquire data. At the same time, control for instructing data recording to the data recording means 4 is performed.

  The data recording unit 4 records measurement data transferred via the data bus unit 2 under the control of the data control unit 3. Specifically, the data recording means 4 is composed of a medium for recording a large amount of digital data, and is constituted by, for example, an HDD or a large capacity memory card.

  The data buffer storage device 5 includes a buffer area 6 for temporarily storing measurement data. Specifically, the buffer area 6 in the data buffer storage means 5 is composed of a memory area (RAM) used by the data control means 3 (CPU), and is used for holding data when the CPU executes a program. .

  The data control means 3 stores the measurement data acquired from the data input means 1 via the data bus means 2 temporarily in the buffer area 6 and then records the data in the data recording means 4 so that it is finally recorded. Is supposed to run.

FIG. 2 is a block diagram showing the operation of the data recording apparatus shown in FIG. 1, and broken-line arrows indicate the flow of data.
In FIG. 2, the data control unit 3 can be divided into two operation functions of a data acquisition control unit 31 and a data recording control unit 32.

The data acquisition control unit 31 acquires data from the data input unit 1 via the data bus unit 2 and temporarily stores it in the buffer area 6 of the data buffer storage unit 5.
The data recording control means 32 reads the data temporarily stored in the buffer area 6 of the data buffer storage means 5 and records the data in the data recording means 4 and temporarily stores it in the buffer area 6 of the data buffer storage means 5. Delete the data stored in.

FIG. 3 is a flowchart showing the measurement data sampling operation according to Embodiment 1 of the present invention, and FIG. 4 is an explanatory diagram showing the operation flow of FIG. 3 in a timing chart.
The operation of the data control means 3 according to the first embodiment of the present invention shown in FIG. 1 will be described below with reference to FIGS.

In FIG. 3, first, sampling conditions are designated, and the number N of processing data per time is set according to the sampling conditions (step S1).
Note that the time t (N) (processing time of step S6 to be described later) required to write N data per time to the data recording means 4 (for example, HDD) is the following formula (1 ).

  t (N) = δ × N + κ (1)

In equation (1), δ is the time required to write one piece of data to the data recording means 4 (HDD), and κ is the data recording means 4 (HDD) per time (regardless of the number of data). Time required for writing (overhead).
Here, if the sampling period is τ and the time required for the temporary storage process (step S4 to be described later) is ε, the number N of processing data per time is determined so as to satisfy the following expression (3). It will be good.

  τ−ε> δ × N + κ (3)

  However, it is necessary to consider the limit of the sampling period τ. In all cases, the number N of processed data is not obtained, but in the first place, the sampling period τ is one of the following formulas (4) and (5): If the above condition is satisfied, the number N of processing data per time cannot be set.

τ <δ (4)
τ <κ (5)

  Further, sampling is impossible in any sampling period τ that does not satisfy the above equation (3) with any number of processed data N, and there exists a number N of processed data that satisfies equation (3). The sampling period τ is also a limit value that can be sampled.

Returning to FIG. 3, the data control means 3 starts sampling (step S <b> 2) following the designation of the sampling condition and the setting of the processing data number N (step S <b> 1), and the number of measurement data reaches the final number of acquisition points. It is determined whether or not it has been reached (step S3).
If it is determined in step S3 that the number of acquisition points has not been reached (that is, NO), the data acquisition control means 31 in the data control means 3 passes the data bus means 2 from the data input means 1 every sampling period τ. Measurement data is acquired, and the acquired measurement data is temporarily stored in the buffer area 6 of the data buffer storage means 5 (step S4).

  Subsequently, with reference to a count counter (not shown) that is cleared to 0 at the initial setting and incremented immediately before execution of step S4, whether or not the process of step S4 has been executed N times (count counter value = N). (Step S5), and if it is determined not to be executed N times (that is, NO), the counter is incremented and step S4 is executed again.

  On the other hand, if it is determined in step S5 that step S4 has been executed N times (that is, YES), the data recording control means 32 in the data control means 3 temporarily enters the buffer area 6 of the data buffer storage means 5. The stored N pieces of measurement data are read and recorded in the data recording unit 4, and the N pieces of measurement data temporarily stored in the buffer area 6 of the data buffer storage unit 5 are erased (step S6). Return to step S3.

At this time, as shown in FIG. 4, every time the temporary storage process (step S4) in the buffer area 6 ends, another process is executed within the sampling period τ.
Similarly, after the temporary storage process to the buffer area 6 (step S4) and the N data recording process to the data recording unit 4 (step S6), other processes are executed within the sampling period τ.

  If it is determined in step S3 that the number of measurement data has reached the final number of acquisition points (that is, YES) by repeating execution of steps S4 to S6, the data recording control means 32 in the data control means 3 All measurement data temporarily stored in the buffer area 6 of the buffer storage means 5 are read out and recorded in the data recording means 4, and all the measurement data temporarily stored in the buffer area 6 of the data buffer storage means 5 are recorded. The measurement data is deleted (step S7), and the sampling processing routine of FIG. 3 is terminated (step S8).

By the above processing, the writing process to the data recording unit 4 (HDD) itself can be reduced, and the amount of data to be written to the data recording unit 4 can be increased at one time. Can be reduced.
As a result, even when a large-capacity storage medium (HDD) having a long data writing time is used as the data recording means 4, the sampling rate is high and the number of acquisition points is large (that is, for a long time). Sampling in which sampling data is guaranteed to be continuously connected without missing can be realized.

In addition, the influence on other processes can be minimized while the data acquisition is being executed.
In addition, since no expensive dedicated equipment for the above processing is required, the data recording apparatus can be realized at low cost.

  In FIG. 2, the function of the data recording control means 32 is provided in the data control means 3, but the data recording control means 32 may be provided in the data recording means 4 as shown in FIG. In this case, the same effects as described above can be obtained.

Embodiment 2. FIG.
In the first embodiment (see FIGS. 1 and 2), one buffer area 6 is provided in the data buffer storage means 5, but a plurality of buffer areas may be provided.
For example, in the first embodiment, it is assumed that the data recording process is considerably faster than the sampling process, and the buffer area 6 does not need to be configured as a double buffer, but the sampling process is faster than the above. In this case, since the data recording time cannot keep up with the sampling interval, it cannot be realized with the configuration described above (FIGS. 1 and 2).

Therefore, in the case of high-speed sampling, for example, a double buffer method is adopted, and while data buffering (temporary storage) is performed in one buffer area, the measurement data in the other buffer area is recorded and processed. It is desirable to enable reliable recording of sampling data.
Note that the use of the double buffer is various, and in logging, a method is generally used in which data is collectively stored and then written to the data recording means.

FIG. 6 is a block diagram showing a data recording apparatus according to Embodiment 2 of the present invention in which a plurality of buffer areas 6a and 6b are provided.
FIG. 7 is a block diagram showing the operation of the data recording apparatus shown in FIG. 6, and the broken-line arrows indicate the flow of data set initially. 7 indicates a data flow at the time of the next processing (when the used buffer area is reversely set).
6 and 7, the same parts as those described above (see FIGS. 1 and 2) are denoted by the same reference numerals as those described above, or “A” after the reference numerals, and detailed description thereof is omitted.

As shown in FIGS. 6 and 7, the data buffer storage means 5A has a plurality of buffer areas 6a and 6b.
The plurality of buffer areas 6a and 6b may be realized by a double buffer (single buffer area as viewed from the outside) in which the structure of the data area of the buffer area 6 is doubled. The buffer area may be realized.

  Further, the data control means 3 obtains the current measurement data acquired from the data input means 1 via the data bus means 2 as one of the buffer areas 6a and 6b (for example, as indicated by a dashed arrow). The previous measurement data already stored in the other buffer area of the plurality of buffer areas 6a and 6b (for example, the buffer area 6b as indicated by the broken line arrow) at the same time as the temporary storage in the buffer area 6a) Is recorded in the data recording means 4.

FIG. 8 is a flowchart showing a sampling operation of measurement data according to Embodiment 2 of the present invention, and FIG. 9 is an explanatory diagram showing the operation flow of FIG. 8 in a timing chart.
8 and 9, the same processes as those described above (see FIGS. 3 and 4) are denoted by the same reference numerals as those described above, or “A” after the reference numerals, and detailed description thereof is omitted.

The operation of the data control means 3 according to the second embodiment of the present invention shown in FIG. 8 will be described below with reference to FIGS.
In FIG. 8, first, sampling conditions are designated, and the number N of processing data per time is set (step S1).
Here, the time t (N) required to write N data per time to the data recording means 4 (processing time in step S6A described later) is expressed by the following equation (1), as described above. Can do.

  t (N) = δ × N + κ (1)

  If the sampling period is τ and the time required for the temporary storage process (step S4A) is ε, the number N of processing data per time may be determined so as to satisfy the following expression (6). .

  (Τ−ε) × N> δ × N + κ (6)

However, as described above, when the sampling period τ satisfies either the expression (4) or the expression (5), it is impossible to set the processing data number N.
In this case, although there is a margin in terms of condition compared to the first embodiment, sampling is impossible in the sampling period τ that does not satisfy the above equation (6), as in the above case. The sampling period τ in which there is a processing data number N that satisfies (6) is also the limit value that can be sampled.

Returning to FIG. 8, following step S1, sampling is started (step S2A).
At this time, the data acquisition control means 31 in the data control means 3 initializes “use buffer area 6a”.
Next, it is determined whether or not the number of acquisition points has been reached (step S3). If the number of acquisition points has not been reached, the data acquisition control means 31 changes the data bus means 2 from the data input means 1 every sampling period τ. The measurement data is acquired via the buffer area 6a and temporarily stored in the buffer area 6a, 6b (the buffer area 6a at the time of initial setting) (step S4A).

Subsequently, it is determined whether or not the process of step S4A has been executed N times (step S5), and if it has not been executed N times, step S4A is executed again.
On the other hand, if the process of step S4A has been executed N times, after setting the buffer area used by the data acquisition control means 31 to the reverse (for example, 6a → 6b), the data recording control means 32 uses the previously used buffer. A read process is performed on the area (for example, 6b), N pieces of measurement data temporarily stored are read and recorded in the data recording means 4, and temporarily stored in the previously used buffer area (for example, 6b). Are deleted (step S6A), and the process returns to step S3.

At this time, as shown in FIG. 9, every time the temporary storage process (step S4A) in the buffer area 6a or 6b is completed, another process is executed within the sampling period τ.
In addition, after the execution target of the temporary storage process is reversed (6a → 6b), the process subsequent to step S6A is executed, and after the end of step S6A, another process is executed within the sampling period τ.

  Thereafter, if it is determined in step S3 that the number of acquisition points has been reached (that is, YES), the buffer area used by the data acquisition control means 31 is set to the reverse (for example, 6a → 6b), and then the data recording control means 32 performs a reading process on the previously used buffer area (for example, 6b), reads all the temporarily stored measurement data, records it in the data recording means 4, and uses the previously used buffer area (for example, 6b). 6b) deletes all the measurement data temporarily stored (step S7A) and ends the sampling (step S8).

  In the above-described first embodiment (see FIG. 3), in order to ensure that the sampling data is continuously connected without missing, until the next temporary storage process (step S4) is started, The determination process (step S5) executed N times must be completed, and step S5 needs to strictly adjust the number N of processing data per one time according to the set sampling period τ.

However, according to the second embodiment (see FIG. 8) of the present invention, the N data recording process (step S6A) after the N times execution determination is executed by interfering with a plurality of times of temporary storage processes (step S4A). However, it can be ensured that the sampling data are continuously connected without being lost.
Therefore, it is possible to perform robust sampling without having to strictly adjust the number N of data to be processed at a time in step S6A according to the set sampling period τ.

  Specifically, in the first embodiment described above, if the sampling period τ is shortened and the sampling speed is increased, no matter how N are adjusted, the current step S4A and the next step S4A are performed. Although step S6A may not be completed in the meantime, in the second embodiment of the present invention, step S6A may be executed over a plurality of steps S4A, so that the sampling period τ is shortened (sampling speed is increased). It can cope even if it becomes.

Also in the second embodiment of the present invention, in order to ensure that sampling data are continuously connected without missing, adjustment of the number of data N is necessary, and step S4A is executed N times. The number of data N may be adjusted so that step S6A is completed during this period.
Further, as described above, since an expensive dedicated facility for the above processing is not required, the data recording apparatus can be realized at a low cost.

Embodiment 3 FIG.
In the first and second embodiments, the buffer area allocation (reservation) is not mentioned, but the data control means 3 may dynamically allocate the buffer area 6 (6a, 6b).
FIG. 10 is a flowchart partially showing the operation of the data recording apparatus according to the third embodiment of the present invention, and shows a case where the buffer area is dynamically allocated.

In FIG. 10, the same processes as those described above (see FIGS. 3 and 8) are denoted by the same reference numerals as those described above, or omitted from illustration and detailed description thereof is omitted.
Further, as the configuration of the data recording apparatus according to the third embodiment of the present invention, one shown in any of FIGS. 1, 2, and 5 to 7 can be applied.

First, the data control means 3 designates a sampling condition, sets N according to the sampling condition (step S1), and dynamically allocates a buffer area according to N (step S10).
Thereafter, sampling is started in the same manner as described above (steps S2 and S2A).

  For example, in the first and second embodiments described above, in order to ensure that sampling data are continuously connected without being lost, adjustment of the number of data N is necessary, and temporary storage processing (step S4, While S4A) is executed N times, it is necessary to adjust the data number N so that the N data recording process (step S6A) after the N times execution determination is completed.

At this time, the factors affecting the adjustment of the number of data N include the sampling period, the number of sampling channels, the overhead of the access processing time per time for the data recording means 4, and the like. N must be set.
That is, the number of data N is adjusted according to the sampling condition, but the buffer area 6 (6a, 6b) needs to be secured to a size that can store N pieces of measurement data.

Therefore, in the first and second embodiments described above, in order to ensure that the sampling data is continuously connected without being lost, a size that allows N pieces of data to be entered in any sampling condition setting ( It is necessary to ensure a size that can contain the maximum number N of data that can occur.
This is inefficient (useless), and in some cases, there is a problem that a larger memory needs to be mounted as a system.

  On the other hand, in the third embodiment of the present invention, the above-mentioned waste is eliminated by dynamically securing (allocating) a buffer according to the number N of processing data per time set according to the sampling condition. As a result, the limited memory can be efficiently used in the entire system.

In other words, the data control means 3 has a buffer size with a size corresponding to the sampling period of the measurement data, a size according to the number of channels of the measurement data, or a size according to the access processing time to the data recording means 4. By dynamically allocating the area 6 (6a, 6b), the memory can be used efficiently.
Moreover, since an expensive dedicated facility for the above processing is not required, the data recording apparatus can be realized at a low cost.

Embodiment 4 FIG.
In Embodiment 3 described above, it is assumed that fixed values specified in advance are used as the values of the HDD writing time δ and the overhead time κ used when determining the number N of processing data. The data control means 3 may measure the access processing time required for the data recording operation by the data recording means 4 and dynamically allocate the buffer area 6 (6a, 6b) with a size corresponding to the actually measured time.

For example, when fixed values δ and κ are used, they are far from the actual system values, and it becomes impossible to determine the more accurate processing data number N, which may cause an operation failure in the data recording process. is there. Therefore, it is desirable to avoid a malfunction of the data recording process by dynamic allocation.
FIG. 11 is a flowchart showing the operation of the data recording apparatus according to the fourth embodiment of the present invention, and shows a case where the buffer area 6 (6a, 6b) is dynamically allocated with a size corresponding to the actually measured time. .

In FIG. 11, processes similar to those described above (see FIGS. 3, 8, and 10) are denoted by the same reference numerals as those described above, or omitted from illustration and detailed description thereof is omitted.
As the configuration of the data recording apparatus according to the fourth embodiment of the present invention, one shown in any of FIGS. 1, 2, and 5 to 7 can be applied.
In this case, the data control unit 3 dynamically allocates the buffer area 6 (6a, 6b) with a size corresponding to the time required for the data recording unit 4 to perform the data recording operation.

First, the data control means 3 designates the sampling conditions (step S1A), performs dummy writing to the set data recording means 4, and measures the processing time, thereby determining the access processing time per time. The overhead is actually measured (step S1B).
Subsequently, the data number N corresponding to the set sampling condition and the actually measured overhead time is set (step S1C), and the buffer area 6 (6a, 6b) is dynamically allocated according to the data number N. (Step S10).
Thereafter, sampling is started in the same manner as described above (steps S2 and S2A).

Note that the overhead measurement processing (step S1B) for the access processing time per time is specifically executed by the following steps S11 to S13.
First, the time T1 required for writing a relatively small amount of data is measured (step S11), and then the time T2 required for writing a relatively large amount of data is measured (step S12).
Finally, the overhead measurement time is calculated using the time difference (T2−T1) between the measurement times T2 and T1 (step S13).
Specifically, by solving the following simultaneous equations (1a) and (1b) based on the above-described equation (1), the writing time δ and the overhead time κ are expressed as in equations (7) and (8). Ask.

T1 = t (N1) = δ × N1 + κ (1a)
T2 = t (N2) = δ × N2 + κ (1b)
δ = (T1-T2) / (N1-N2) (7)
κ = T1-N1 (T1-T2) / (N1-N2) (8)

  For example, in the above-described third embodiment, the buffer is dynamically secured (allocated) according to the number of data N set according to the sampling condition (step S10). At this time, according to the sampling condition. The “overhead of the access processing time per time for the data recording means 4” added as an element when setting the number of data N varies depending on the type of the data recording means 4.

  Therefore, actually, it is necessary to set the number of data N with the maximum overhead of what is assumed as the data recording means 4. That is, the size of the buffer area 6 (6a, 6b) to be dynamically secured is also allocated to a large size according to the maximum overhead, and there is a problem that it is inefficient (wasted).

On the other hand, in Embodiment 4 of the present invention, the overhead of access processing time per time is actually measured for the data recording means 4 set under the sampling condition, and the processing per time is performed using the actually measured time. Since the number of data N is set and the size of the buffer area 6 (6a, 6b) to be allocated is set according to the set number of data N, the above-mentioned waste is eliminated, and as a result, the memory limited in the entire system Can be used efficiently.
Moreover, since an expensive dedicated facility for the above processing is not required, the data recording apparatus can be realized at a low cost.

Embodiment 5. FIG.
In the first to fourth embodiments, one data recording unit 4 is used. However, a plurality of data recording units may be provided.
FIG. 12 is a block diagram showing a data recording apparatus according to Embodiment 5 of the present invention in which a plurality of data recording means 4a and 4b are provided.

In FIG. 12, the same components as those described above (see FIG. 1) are denoted by the same reference numerals as those described above, and detailed description thereof is omitted. The data control means 3 includes a data acquisition control means 31 and a data recording control means 32 as shown in FIG.
In this case, the data control unit 3 temporarily stores the measurement data acquired from the data input unit 1 via the data bus unit 2 in the buffer area 6 of the data buffer storage unit 5 and then finally stores a plurality of data. Data recording control is executed so as to record in the recording means 4a, 4b.

  Further, the data control means 3 takes the time required for the data recording operation of each of the plurality of data recording means 4a, 4b or the actual measurement time into consideration with each time or each actual measurement time, and adds a larger overhead (time difference value). The buffer area 6 is dynamically allocated with a size according to () or a size according to the addition time value.

Next, the sampling processing operation according to the fifth embodiment of the present invention shown in FIG. 12 will be described with reference to the flowchart of FIG.
In FIG. 13, the same processes as those described above (see FIG. 3) are denoted by the same reference numerals as those described above, and detailed description thereof is omitted.

First, the data control means 3 designates a sampling condition, and sets the number of data N according to the larger overhead to the data recording means 4a and 4b (step S1D).
Thereafter, sampling is started (step S2), steps S3 to S5 are executed, and when step S4 is executed N times, a temporary storage process (step S6D) is executed.

At this time, in step S6D, the data recording control means 32 in the data control means 3 reads N pieces of measurement data temporarily stored in the buffer area 6 of the data buffer storage means 5 to read the data recording means 4a, The N pieces of measurement data recorded in 4b and temporarily stored in the buffer area 6 are deleted.
Thereafter, if it is determined in step S3 that the number of acquired points has been reached (that is, YES), steps S7 and S8 are executed, and the sampling processing routine of FIG. 13 is terminated.

Although FIG. 12 shows the case where two data recording means 4a and 4b are provided, three or more data recording means may be provided.
According to the fifth embodiment of the present invention, sampling data can be recorded on a plurality of data recording means 4a, 4b (HDD recording media), so that reliability due to redundancy can be ensured.

That is, there is some trouble (for example, a trouble in the communication line between the data control means 3 and the data recording means 4a, 4b, or the data recording means 4a, Even when the trouble of the operation itself of 4b occurs), the measurement data recorded on the other recording medium can be used, and a safe dual data logging system can be constructed.
Moreover, since an expensive dedicated facility for the above processing is not required, the data recording apparatus can be realized at a low cost.
Furthermore, also in this case, the memory can be efficiently used by dynamically allocating the buffer area 6 with a size corresponding to the access processing time for the plurality of data recording means 4a and 4b.

Embodiment 6 FIG.
In the first to fifth embodiments, one data control unit 3 is provided, but a plurality of data control units may be provided.
FIG. 14 is a block diagram showing a data recording apparatus according to Embodiment 6 of the present invention in which a plurality of data control means 3a and 3b are provided.

In FIG. 14, the data control means 3a and 3b installed in parallel are provided with respective data buffer storage means 5a and 5b, and each data buffer storage means 5a and 5b has individual buffer areas 6a and 6b. is doing. In other words, in this case, a plurality of buffer areas 6a and 6b may be provided in appearance.
The data recording means 4E has data recording areas 7a and 7b individually corresponding to the data control means 3a and 3b. Specifically, the data recording areas 7a and 7b are composed of data recording files.

In this case, the data control means 3a and 3b correspond to the number of types of data recording processes in the data recording areas 7a and 7b in the data recording means 4E.
That is, the data control means 3a and 3b perform data recording control on the data recording means 4E so as to correspond to the number of types of data recording processing in the data recording means 4E.

FIG. 15 is an explanatory diagram partially showing a timing chart of the operation of the apparatus shown in FIG.
In FIG. 15, the lower side of the dotted line shows the flow of time (timing chart), the upper side of the dotted line shows the flow of data, and the broken line frame shows the data recording control process.
Steps S4a and S4b are the same processing as step S4 (S4A) described above, and correspond to the operations of the data control means 3a and 3b in FIG. 14, respectively.
Similarly, steps S6a and S6b are the same processing as step S6 (S6A and S6D) described above, and correspond to the operations of the data control means 3a and 3b in FIG. 14, respectively.
As sampling conditions for the data control means 3a and 3b, the frequency f1 of sampling a (CH1) is 1 kHz, and the frequency f2 of sampling b (CH2) is 2 kHz.

  In this case, first, in step S4b, “value 1” of CH2 is temporarily stored in the buffer area 6b under the condition of sampling b (2 kHz), and following the other processing, in the next step S4b, sampling b (2 kHz ) “Value 2” of CH2 is temporarily stored in the buffer area 6b.

  Next, in step S4a following the other process, “value 3” of CH1 is temporarily stored in the buffer area 6a under the condition of sampling a (1 kHz), and in step S4b following the other process, sampling b (2 kHz) Under the conditions, “value 4” of CH2 is temporarily stored in the buffer area 6b.

  Subsequently, in step S6b immediately after the temporary storage process (step S4b) of “value 4” for CH2, the measurement data “value 1, value 2, value 4” in the buffer area 6b is stored in the data recording means 7E. It is transferred to the recording area 7b.

Following the data transfer process (step S6b) to the data recording area 7b, in step S4b after execution of other processes, the data value of CH2 is temporarily stored in the buffer area 6b as necessary.
Next, in step S4a following other processing, “value 6” of CH1 is temporarily stored in the buffer area 6a under the condition of sampling a (1 kHz).

Subsequently, in step S6a immediately after the temporary storage process (step S4a) of “value 6” for CH1, the measurement data “value 3, value 6” in the buffer area 6a is stored in the data recording area 7a in the data recording means 7E. Forwarded to
Thereafter, the data control means 3a and 3b repeatedly execute the above processing until the final number of acquisition points is reached.

  According to the sixth embodiment of the present invention, even when there are a plurality of samplings with different conditions, the sampling processes with independent tasks (processes) can be executed, so the samplings with different conditions can be executed at the same time. Multiple logging of sampling can be performed simultaneously.

Further, in the case of the sixth embodiment of the present invention, the processing contents required for steps S4a and S4b and steps S6a and S6b during the above processing are simpler than those of the above-described fifth embodiment. As a result, the entire system can be processed at high speed.
Moreover, since an expensive dedicated facility for the above processing is not required, the data recording apparatus can be realized at a low cost.

  However, as apparent from FIG. 15, the samplings a and b operate independently of each other, and the time axes between the data recording area 7a and the data recording area 7b do not match (logging is performed with the same time axis). It is meaningless to display the data recording areas 7a and 7b in the same graph. In other words, since sampling a and b are executed at different sampling frequencies f1 and f2, it is completely meaningless to execute processing such as taking a difference between the measurement data of samplings a and b.

Embodiment 7 FIG.
In the sixth embodiment (see FIG. 14), the individual CH processing is executed for each of the buffer areas 6a and 6b using the two data control units 3a and 3b (two tasks). A single data control means 3 (one task) may be used to execute a process for a plurality of channels for one buffer area 6 having a double buffer configuration.
FIG. 16 is a block diagram showing a data recording apparatus according to Embodiment 7 of the present invention, and shows a case where data recording in the data recording areas 7a and 7b is controlled by using one data control means 3. In FIG.

In FIG. 16, the buffer area 6 of the data buffer storage means 5 may have a double buffer configuration, or a plurality of buffer areas 6 may be set as described above (see FIG. 6).
Further, by combining the above, a plurality of buffer areas 6 may be set and each may be configured as a double buffer.

FIG. 17 is a flowchart showing the operation of the apparatus shown in FIG. 16, and the same processes as those described above (see FIG. 3) are denoted by the same reference numerals and detailed description thereof is omitted.
FIG. 18 is an explanatory diagram partially showing the operation flow of FIG. 16 in a timing chart. Similarly to the above (see FIG. 15), the frequency f1 of the sampling a (CH1) is 1 kHz and the sampling b (CH2) as the sampling condition. ) Is 2 kHz.
FIG. 18 shows a case where both samplings a and b are logged in the common buffer area 6.

In this case, the process of step S4E is executed at a sampling period corresponding to the least common multiple of the sampling frequencies f1 and f2 of CH1 and CH2.
That is, in this case, as a result, the sampling period τ2 (= 1 / f2) corresponding to the sampling frequency f2 (= 2 kHz) of CH2, which is twice the sampling frequency f1 (= 1 kHz) of CH1, is obtained.

That is, in FIG. 18, only the measurement data of CH to be acquired is acquired at the sampling period τ2 of CH2.
If there is no CH data to be acquired, no processing is executed in step S4E.

Next, the operation according to the seventh embodiment of the present invention shown in FIG. 16 will be described with reference to FIGS.
In FIG. 17, first, a plurality of sampling conditions are specified (step S1E), and sampling is started (step S2).
Subsequently, if the number of acquisition points has not been reached, the data acquisition control means 31 acquires measurement data from the data input means 1 via the data bus means 2 at each sampling period τ (= τ2), and stores it in the buffer area 6. Temporary storage is performed (step S4E).

When step S4E is repeated and step S4E is executed N times, the data recording control means 32 reads out the measurement data temporarily stored in the buffer area 6, and the data recording means 4E The measurement data recorded in the data recording area 7a or 7b and temporarily stored in the buffer area 6 is erased (step S6E).
Thereafter, when the final number of acquisition points is reached, steps S7 and S8 are executed, and the sampling processing routine of FIG. 17 is terminated.

Specifically, for example, as shown in FIG. 18, first, “value 1” of CH2 is temporarily stored in the buffer area 6 in step S4E, and “value 2” of CH2 and “value 3” of CH1 are subsequently stored in step S4E. Is temporarily stored in the buffer area 6.
In the next step S4E, “value 4” of CH2 is temporarily stored in the buffer area 6, and “value 5” of CH2 and “value 6” of CH1 are temporarily stored in the buffer area 6 in subsequent step S4E. .

Next, in step S6E, “value 1, value 2, value 4, value 5” of CH2 in the buffer area 6 is transferred to the data recording area 7b of the data recording means 4E, and “value” of CH1 in the buffer area 6 is transferred. 3, 6 ”is transferred to the data recording area 7a of the data recording means 4E.
Thereafter, the above process is repeatedly executed.

According to the seventh embodiment of the present invention, sampling under different conditions can be executed simultaneously.
In addition, since the time axes of the data recording area 7a and the data recording area 7b coincide with each other, it is meaningful to display the data recording areas 7a and 7b in the same graph, and sampling processes under different conditions were executed simultaneously. In some cases, the results can be analyzed later together.
In addition, by matching the time axis between multiple files, logging of slow data changes, such as temperature changes, and fast data changes, such as flow rates, can be performed efficiently without exploding data volume. And a correct analysis with the same time axis can be performed at a later examination.

18 shows a case where one buffer area 6 is used in common for CH1 and CH2, but a plurality of buffer areas divided by applying a double buffer configuration, for example, as shown in FIG. 6a and 6b may be used.
FIG. 19 shows the case where the samplings a and b are logged in the individual buffer areas 6a and 6b, respectively. In this case, a plurality of buffer areas 6a and 6b (double buffers) are provided for each sampling.

In FIG. 19, for each step S4E, “value 3, value 6” of CH1 is temporarily stored sequentially in one buffer area 6a, and “value 1, value 2, value 2” of CH2 is temporarily stored in the other buffer area 6b. Value 4, value 5 "are temporarily stored in sequence.
Thereafter, in step S6E, the data values in the buffer areas 6a and 6b are transferred to the data recording areas 7a and 7b in the data recording means 4E, respectively.
In the case of the double buffer configuration shown in FIG. 19, in addition to the effects described above (see FIG. 18), the effects in the second embodiment described above (see FIGS. 6 to 9) can also be obtained.

Further, as shown in FIG. 20, the same configuration as in FIG. 19 can be applied to sampling conditions (CH4, CH5) different from those described above.
The configuration and processing in FIG. 20 are basically the same as those in FIG. 19, and the sampling a and b are logged in the individual buffer areas 6a and 6b, respectively.

However, in FIG. 20, as sampling conditions, the frequency f4 of sampling a (CH4) is 2 kHz, and the frequency f5 of sampling b (CH5) is 3 kHz.
Therefore, the least common multiple of the sampling frequencies f4 and f5 of CH4 and CH5 is 6 kHz (= 2 × 3 [kHz]), and the temporary storage process (step S4E) is executed at the sampling period corresponding to the sampling frequency 6 kHz. become.

That is, in FIG. 20, the process of step S4E is executed at a period corresponding to the least common multiple of the sampling frequencies of CH4 and CH5, and only the measurement data of CH to be acquired is acquired.
In FIG. 20, when there is no CH measurement data to be acquired, as in step S4E following the temporary storage process (step S4E) of “value 5” of CH4 in the buffer area 6a, in step S4E. No processing is performed.

In the data recording process shown in FIG. 20, the relationship between the two samplings a and b (CH4 and CH5) corresponds to the least common multiple of each sampling frequency because one sampling frequency is not an integer multiple of the other sampling frequency. Sampling processing (step S4E) is executed at the cycle described above.
Further, in each sampling process (step S4E), only the sampling CH in which the corresponding measurement data exists is sampled, and no sampling process is performed for the other CHs. Even when the sampling period is not an integer multiple of the other sampling period, the above-described effects can be obtained.

Further, the data control means 3 (see FIG. 16) dynamically allocates the buffer area 6 with a size corresponding to the measurement data sampling period, and also sets the buffer area 6 with a size corresponding to the number of channels of the measurement data. Allocate dynamically.
Thereby, there is no waste and the limited memory can be used efficiently in the entire system.

Also, as shown in FIG. 21, when there is a CH that is commonly logged between different sampling conditions, it is not necessary to acquire a plurality of times, and a double buffer configuration similar to that described above (see FIG. 19) is used. On the other hand, a plurality of destinations are written in one acquisition.
Here, as sampling conditions in FIG. 21, the frequency f12 of sampling a (CH1 and CH2) is 1 kHz (both CH1 and CH2 are acquired at 1 kHz), and the frequency f2 of sampling b (CH2) is 2 kHz.
In this case, in the first temporary storage process (step S4E), “value 1” of CH2 is written to the buffer area 6b, and in step S4E, “value 2” of CH2 is written to the buffer areas 6a and 6b. “Value 3” of CH1 is written in the buffer area 6a.

Similarly, in the next step S4E, “value 4” of CH2 is written in the buffer area 6b. In subsequent step S4E, “value 5” of CH2 is written in the buffer areas 6a and 6b and “ Value 6 "is written to the buffer area 6a.
Thereafter, in step S6E, the data values in the buffer areas 6a and 6b are transferred to the data recording areas 7a and 7b in the data recording means 4E, respectively.
In the case of the data recording process shown in FIG.

In particular, CHs logged in common among a plurality of files do not need to be acquired a plurality of times, and are only written to a plurality of destinations in a single acquisition, thereby reducing the load required for logging as a whole.
That is, since the data acquisition process from the CH of the data input means 1 (AD board) is performed 6 times, the data writing process to the data recording means 4E is executed 8 times. There is no redundancy in the processing related to acquisition, and the processing related to data acquisition from the CH of the AD board can be accelerated accordingly.
Moreover, since an expensive dedicated facility for the above processing is not required, the data recording apparatus can be realized at a low cost.

Embodiment 8 FIG.
Although not particularly mentioned in the first to seventh embodiments, the same effect can be obtained even if an inspection apparatus including any one of the data recording apparatuses is configured.
In this case, an inexpensive inspection device can be realized by performing inspection processing using measurement data recorded in the data recording device in an inspection device including an intelligent inspection unit.

Embodiment 9 FIG.
Moreover, even if it comprises the control apparatus provided with the data recording device in any one of the said Embodiments 1-7, there exists an equivalent effect.
In this case, in a control device composed of FA equipment such as a sequencer, motion controller, numerical control device, robot, etc., it is inexpensive by executing sequence control processing or motion control processing using measurement data recorded in the data recording device. A simple control device can be realized.

1 is a block diagram showing a data recording apparatus according to Embodiment 1 of the present invention. It is a block diagram which shows operation | movement of the data recording device which concerns on Embodiment 1 of this invention. It is a flowchart which shows the sampling operation | movement of the data recording device concerning Embodiment 1 of this invention. It is explanatory drawing which shows the sampling operation | movement of the data recording device which concerns on Embodiment 1 of this invention with a timing chart. It is a block diagram which shows the other operation example of the data recording device which concerns on Embodiment 1 of this invention. It is a block diagram which shows the data recording device which concerns on Embodiment 2 of this invention. It is a block diagram which shows operation | movement of the data recording device which concerns on Embodiment 2 of this invention. It is a flowchart which shows the sampling operation | movement of the data recording device which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the sampling operation | movement of the data recording device which concerns on Embodiment 2 of this invention with a timing chart. It is a flowchart which shows a part of operation | movement of the data recording device based on Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the data recording device based on Embodiment 4 of this invention. It is a block diagram which shows the data recording device based on Embodiment 5 of this invention. It is a flowchart which shows the sampling operation | movement of the data recording device based on Embodiment 5 of this invention. It is a block diagram which shows the data recording device based on Embodiment 6 of this invention. It is explanatory drawing which shows the sampling operation | movement of the data recording device which concerns on Embodiment 6 of this invention with a timing chart. It is a block diagram which shows the data recording device based on Embodiment 7 of this invention. It is a flowchart which shows operation | movement of the data recording device based on Embodiment 7 of this invention. It is explanatory drawing which shows in part a timing chart the 1st sampling operation | movement of the data recording device which concerns on Embodiment 7 of this invention. It is explanatory drawing which shows the 2nd sampling operation | movement of the data recording device based on Embodiment 7 of this invention with a partial timing chart. It is explanatory drawing which shows in part a timing chart the 3rd sampling operation | movement of the data recording device which concerns on Embodiment 7 of this invention. It is explanatory drawing which shows a 4th sampling operation | movement of the data recording device based on Embodiment 7 of this invention with a partial timing chart.

Explanation of symbols

  1 data input means, 2 data bus means, 3, 3a, 3b data control means, 4, 4a, 4b, 4E data recording means, 5, 5A, 5a, 5b data buffer storage means, 6, 6a, 6b buffer area, τ, τ2 Sampling period.

Claims (13)

A data input means for capturing a signal to be inspected or measured as measurement data;
Data bus means for transferring the measurement data;
Data recording means for recording measurement data transferred via the data bus means;
In a data recording apparatus comprising: data control means for performing data recording control for recording the measurement data in the data recording means;
Data buffer storage means including a buffer area for temporarily storing the measurement data;
The data control means stores the measurement data acquired from the data input means via the data bus means temporarily in the buffer area, and finally records the data in the data recording means. A data recording device characterized in that The data buffer storage means includes a plurality of buffer areas as the buffer area,
The data control means temporarily stores the current measurement data acquired from the data input means via the data bus means in one of the plurality of buffer areas, and at the same time, the plurality of buffers 2. The data recording apparatus according to claim 1, wherein data recording control is performed so as to record the previous measurement data already stored in the other buffer area of the area in the data recording means.   3. The data recording apparatus according to claim 1, wherein the data control unit dynamically allocates the buffer area.   4. The data recording apparatus according to claim 3, wherein the data control unit dynamically allocates the buffer area with a size corresponding to a sampling period of the measurement data.   4. The data recording apparatus according to claim 3, wherein the data control unit dynamically allocates the buffer area with a size corresponding to the number of channels of the measurement data.   4. The data recording apparatus according to claim 3, wherein the data control unit dynamically allocates the buffer area with a size corresponding to a time required for the data recording operation of the data recording unit.   7. The data according to claim 6, wherein the data control unit actually measures a time required for the data recording operation by the data recording unit and dynamically allocates the buffer area with a size corresponding to the actually measured time. Recording device. The data recording means includes a plurality of data recording means,
The data control means stores the measurement data acquired from the data input means via the data bus means temporarily in the buffer area, and finally records the data in the plurality of data recording means. 8. A data recording apparatus according to claim 1, wherein recording control is performed.   The data control means is a size or addition time corresponding to the larger time value with respect to the time required for the data recording operation of each of the plurality of data recording means or the actual measurement time in consideration of each time or each actual measurement time. 9. The data recording apparatus according to claim 8, wherein the buffer area is dynamically allocated with a size corresponding to the value.   10. The data control unit according to any one of claims 1 to 9, wherein the data control unit includes a plurality of data control units so as to correspond to the number of types of data recording processes in the data recording unit. The data recording device described.   10. The data control unit according to claim 1, wherein the data control unit performs data recording control on the data recording unit so as to correspond to the number of types of data recording processing in the data recording unit. The data recording apparatus according to item 1.   The inspection apparatus having the data recording apparatus according to any one of claims 1 to 11, wherein an inspection process is executed using measurement data recorded in the data recording apparatus.   12. The data recording apparatus according to claim 1, wherein a sequence control process or a motion control process is executed using measurement data recorded in the data recording apparatus. Control device.

Images