JPH1115701A - Method and system for collecting data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate uselessness when the change data of state data of a control object device which is fetched into a controller are transferred to an external data handling means. SOLUTION: A sequence controller 1 monitors the state of a machine tool M, successively stores data changed among state data in a changed data storing part 9 and counts the number of the stored data with a counter 10. Before an external data handling means 20 sends a transfer request for changed data to the controller 1, it checks the count value, decides that changed data which are not transferred do not exist when the count value is zero and do not make a transfer request.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for controlling a device to be controlled, for example, an industrial machine such as a machine tool, which collects operating state data of the device to be controlled, and detachably attaches the data to the control device. The present invention relates to a data collection method and a system for transferring data to external data handling means.

[0002]

2. Description of the Related Art State data of an equipment machine is fetched into a control device for controlling the equipment machine in a time-series manner, compared with the previously fetched state data, and changed data is referred to as abnormal data (referred to in the present application). (Status data), the type of the abnormal data and management information such as the time of occurrence are added and stored in an abnormal data storage memory in the control device, and a RAM cassette detachable from the control device as necessary. There is a method in which data in the abnormal data storage memory is copied to (external data handling means) and can be analyzed by an analysis computer provided in a location different from the control device (Japanese Patent Publication No. 7-27482).

[0003]

According to the above, according to the RAM
By connecting the cassette to the control device and pressing the RAM cassette store switch, all the abnormal data in the abnormal data storage memory in the control device is copied.
The abnormal data to be copied to the RAM cassette is copied at a certain timing, and if no abnormal data is generated between the next copy and the next copy, the abnormal data in the abnormal data storage memory is stored at the time of the next copy. There is no change in abnormal data. In such a case, if the above-described copy is performed, the above-described copy of the abnormal data is completely the same as the previous one, which is a wasteful transfer operation, which is not preferable. An object of the present invention is to eliminate the useless state data transfer operation by preventing data transfer to external data handling means when there is no untransferred data in the control device.

[0004]

In order to solve the above problems,
The present application detects a change in state data of a control target device by a control device that controls the control target device, and when there is a change in the state data, stores the change data in a change data storage unit in the control device, The number of stored change data is counted, and the count value is checked in a state where external data handling means detachable to the control device is connected to the control device. When the change data in the storage unit is not transferred to the external data handling unit and the count value is “1” or more, the data transfer control for transferring the change data in the change data storage unit to the external data handling unit is performed. Features (Claim 1).

In the apparatus of the present invention, a control device for controlling a controlled device detects a change in state data of the controlled device, and when there is a change in the state data, stores the changed data in a changed data storage in the control device. In the data collection system, the change data stored in the change data storage unit can be transferred to an external data handling unit that is detachable from the control device, and the control device stores the change data in the change data storage unit. A data number counter for counting the number of changed data, checking a count value of the counter in a state where the control device and the external data handling means are connected, and determining whether data transfer is necessary or not based on the count value. Means is provided (claim 2).

More specifically, there is provided reset means for resetting the counter after data transfer corresponding to the count number in the change data storage unit performed according to the result of the judgment by the judgment means. Further, the change data storage unit stores change data sequentially in time series, and the control device stores, in the change data before transfer, the change data storage unit in which the change data stored first is stored. And means for holding the read start position in the step (a), and at the time of data transfer, change data from the read start position are sequentially read and transferred (claim 4). In these configurations, by checking the data number counter, it is possible to determine the presence / absence of untransferred data while the external data handling means is connected. It is possible to transfer data only when there is untransferred data without transferring it to the handling means, and to avoid erroneous transfer work when there is no untransferred changed data, thereby eliminating useless transfer work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present application will be described with reference to FIG.
Here, the machine tool M is targeted as the control target device. The control device is a sequence controller 1 generally used to control such a machine tool. The sequence controller 1 includes a central processing unit (CPU) 2, a storage unit 3, a clock unit 4, and an I / O interface 5 for exchanging signals with external devices. The storage means 3 includes a program storage section 6 in which a program for a state change monitor described later is stored in addition to an operation control program of the machine tool to be processed by the CPU 2, and a previous state necessary for monitoring a state change. The previous data storage unit 7 for storing data, the current data storage unit 8 for storing current data, and the clock means 4 when the change data is found by comparing the previous and current data. And a data number counter 10 for counting the number of change data that has not been transferred. As shown in FIG. 4, the change data storage unit 9 stores the end nE of the buffer area.
When the change data is stored up to the first nS of the buffer area
Returning to FIG. 7, a ring buffer for overwriting the change data, as described later, points to the write position (address) of the change data by the write pointer W, and is stored first among the change data that has not been transferred. The write position of the changed data is held (stored) by the read start pointer R.

[0008] The external data handling means 20 is, for example, a handheld computer. As is well known, a central processing unit (CPU) 11, a storage unit 12, and an I / O
An / O interface 13 is provided. A change data storage unit 14 for storing change data transferred from the sequence controller 1 is provided in a predetermined memory area of the storage unit 12. The program storage unit 15 stores a data transfer control program described later. The external data handling means 20 is connected to the sequence controller 1 via the I / O interface 13,
It is also removable. Therefore, the external data handling means 20 is provided with a plurality of different sequence controllers 1 by one unit.
Can respond to.

As shown in FIG. 2, the data transfer control program of the external data handling means 20 includes a count value requesting means (step S1) for requesting the count value counted by the counter 10, and whether the count value is "0" or not. Means for judging whether or not to make a data transfer request in step S3 (step S2: means for judging the necessity of a data transfer request), data transfer request means (step S3), and the result of the data request is transferred. Storage command means (step S4) for storing the received change data in the change data storage section 14 of the section data handling means 20, and reset means (step S5) for requesting a reset of the counter 10 after transferring the change data by the number of counts. And the last count value was requested while the external data handling means 20 was connected to the sequence controller 1. It is set at fixed time intervals, to determine whether the check time to check the change data has passed, at the time interval consists of a check time determining means (step S6) returning to the step S1.

FIG. 3 shows a status data monitoring program of the sequence controller 1. Step S7 is a request judging means for judging whether there are various requests (count value request, change data transfer request, counter reset request) from the external data handling means 20, and the corresponding processing (steps S8, S9, S10) Execute Step S11 is means for judging the presence or absence of change data. Specifically, the operation state data of the previous device that has already been fetched into the previous data storage unit 7 at a predetermined timing in the past and the latest fetched current time Then, the state data having different states is extracted as change data (where the state changed and how, that is, the place where the state changed and the content of the change). Here, the state data is the ON / OFF state of the operation power supply,
Automatic operation start and end states, signal states from abnormality detection means provided at various parts of the machine, etc.A plurality of state signals to be monitored are fetched by reading state data once, and those states are read. The signals are compared one by one in the previous time and in the current time.

Step 12 is time data adding means for adding the time measured by the clock means 4 to the detected change data. Step 13 is a means for writing to the change data storage unit 9, and writes the change data to the write position indicated by the write pointer W (FIG. 4). Step 14 is a means for shifting the write pointer by one for the next write, and Step 15 is a step for storing one such change data.
Counting command means for counting up the counter 10,
Step 16 is a means for determining whether or not all of the state signals have been compared. Step S17 is a data updating means for setting the current state data in the previous data storage unit 7 to detect the next change data. Step S18 Means for making the position of the read start pointer R coincide with the write pointer position for reading untransferred data at the next transfer following the counter reset.

When the external data handling means 20 is not connected to the sequence controller 1, various requests from the external data handling means 20 do not enter the sequence controller 1, so that the processing goes to step S11 via step S7 in FIG. move on. At a predetermined state data capture timing, the current data captured this time and stored in the current data storage unit 8 and the previous data captured last time and stored in the previous data storage unit 7 are sequentially compared.
The type of the change data and the state of the change are determined in step S12.
Then, the changed time data is added. Then, the data is written to the change data storage unit 9 in step S13.

The state immediately after the transfer is completed will be described.
At this time, both the write and read start pointers W and R are located at the address next to the end address of the transferred data (here, n
1) (FIG. 4). When the step S13 is executed, the first change data A is written at the position indicated by the write pointer W (FIG. 4). And step S
In step 14, the write pointer W is shifted by one (here, address n2), the counter is incremented by 1 in step S15 (), and in step 16, it is determined whether or not all the state data to be monitored have been compared. Steps S11 to S16 are repeated, and if so, the current data fetched this time in step S17 is written to the previous data storage unit 7 to update the data for the next state data comparison.

Now, after FIG. 4, by comparing the current data with the previous data, the change data A is followed by the change data B.
Occurs, this change data B is stored in step S1.
2, the time data is added, and the write pointer W
Is written to the address n2 position indicated by (). Then, as described above, the write pointer W moves down by one (),
In step S15, the counter 10 is incremented by "1".
In this way, the change data is sequentially stored in the change data storage unit 9 in chronological order. In this embodiment, the count value of the counter 10 is newly stored in the change data storage unit 9 after transfer. The number of changed data that has been transferred is the number of changed data that has not been transferred.

Assume that the external data handling means 20 is connected in the state described above. As soon as the external data handling means 20 is connected, the count value of the counter 10 is requested in step S1. Then, the sequence controller 1 receives the request and sends out the count value in step S8. The external data handling means 20 determines in step S2 whether the transferred count value is “zero” or “1” or more. If the count value is "zero", the process does not proceed to step S3, and no change data transfer request is issued. When the count value is zero, it indicates that no new change data has occurred since the previous state data check and no untransferred change data exists on the sequence controller 1 side. The method of the present invention in which a request is not issued is extremely advantageous in eliminating unnecessary transfer control.

When the count value is equal to or greater than "1", there is untransferred change data, so that the transfer of the change data is requested. Upon receiving the transfer request, the sequence controller 1 stores the change data in the change data storage unit 9 immediately before the position indicated by the write pointer W from the position indicated by the read start pointer R (here, n1) in step S9. Read up to (n2). The change data thus read is transferred (FIG. 4). The external data handling unit 20 that has received the transfer data stores the transfer data as it is in the change data storage unit 14 as it is. When all the untransferred data is transferred to the external data handling means 20, the external data handling means 20 issues a counter reset request to the sequence controller 1 in step S5. In response to the reset request, the sequence controller 1 resets the counter 10 in step S10, matches the position of the read start pointer R with the position of the write pointer W in step S18, and ends the transfer operation (FIG. 4). ). The change data newly generated after the transfer is stored again from the position indicated by the write pointer W (here, n3). Since the change data storage unit 9 of the sequence controller 1 is a ring buffer, each of the pointers W and R for starting writing and reading is stored at the end n of the buffer area.
When it reaches E, it returns to the head nS of the buffer area, and so on.

[0017]

As described above, according to the present invention, it is possible to determine whether or not there is untransferred data in the control device by checking the change data number counter of the control device with the external data handling means connected. When there is no transfer data, transfer control is not performed, and only when there is untransferred data,
Since the transfer control is performed, it is possible to avoid erroneous data transfer work in a state where there is no untransferred data, and it is possible to eliminate useless transfer work.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a device of the present application.

FIG. 2 is a flowchart showing a data transfer control program of an external data handling means.

FIG. 3 is a flowchart illustrating a state change monitoring program of the control device.

FIG. 4 is an explanatory diagram showing a procedure for storing change data in a change data storage device.

[Explanation of symbols]

 Reference Signs List 1 sequence controller (control device) 7 previous data storage unit 8 current data storage unit 9 change data storage unit 10 data number counter 20 external data handling means R read start pointer W write pointer M controlled device (machine tool)

Claims (4)

[Claims] A control device for controlling a control target device detects a change in state data of the control target device, and when there is a change in the state data, stores the change data in a change data storage unit in the control device. At the same time, the number of stored change data is counted, and the count value is checked in a state where external data handling means detachable to the control device is connected to the control device. If the count value is “zero”, If the change data in the change data storage unit is not transferred to the external data handling unit and the count value is "1" or more, data transfer control for transferring the change data in the change data storage unit to the external data handling unit is performed. A data collection method characterized in that: 2. A control device for controlling a device to be controlled detects a change in state data of the device to be controlled, and when there is a change in the state data, stores the change data in a change data storage unit in the control device. In a data collection system in which the change data in the change data storage unit can be transferred to an external data handling unit detachable from the control device, the control device stores the number of change data stored in the change data storage unit. A data number counter that counts the number of times, and a determination unit that checks the count value of the counter in a state where the control device and the external data handling unit are connected, and determines whether data transfer is necessary or not based on the count value. A data collection system, characterized in that: 3. The data collection system according to claim 2, further comprising reset means for resetting the counter after data transfer corresponding to the count number in the change data storage unit performed based on the result of the judgment by the judgment means. 4. A change data storage section stores change data in chronological order, and a control device stores, among change data before transfer, a change data in which change data stored first is stored. 4. The data collection device according to claim 2, further comprising means for holding a read start position in the data storage unit, wherein data change is sequentially read from the read start position and transferred during data transfer. system.