JP2007213449A - Collected data monitoring method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly measure and display on-time or off-time of an arbitrary on-pulse or off-pulse on a pulse train waveform in displaying a pulse train waveform corresponding to a series of time-series bit data related to each of a plurality of variables collected by a data collection unit on a screen of an image display unit by, for example, arranging the waveform over a plurality of lines. <P>SOLUTION: Based on the on/off state at one point in the direction of a time axis specified by a predetermined cursor on each pulse train waveform, and the anteroposterior continuity of the on-state or off-state on the time-series bit data of the on/off state, the time point corresponding to the starting point and the end point of the one on-pulse or the one off-pulse is obtained, and the on-time or the off-time corresponding to the pulse width of the one on-pulse or the one off-pulse is generated from the starting time point and the end time point. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for monitoring a series of time-series bit data corresponding to each value at each collection time of a plurality of variables collected from a memory of a programmable controller by a data collection unit via an image display. About.

  As a device that automatically collects a series of time-series bit data corresponding to the on / off states of various variables (input / output signals) from a programmable controller (PLC) memory (eg, input / output memory, data memory, etc.) A data collection unit (SPU) is conventionally known (see Patent Document 1). It has also been conventionally known that a series of time-series bit data sequences collected by this type of data collection device is monitored via an image display (see Patent Document 2).

  In this type of monitor device, a pulse train waveform corresponding to a series of time-series bit data related to each of a plurality of variables collected by a data collection unit is displayed side by side on a screen of an image display device over a plurality of lines. It is customary.

  When various trials for improving the tact time are performed in a production line or the like to be controlled by the PLC, the result is 1 or 2 in the pulse train waveform corresponding to each variable displayed on the screen of the monitor device. It often appears as a change in the pulse width (on time) of the above on pulse or the pulse width (off time) of the off pulse.

  In addition, when a sensor or actuator incorporated in a production line or the like to be controlled by the PLC undergoes aging (wearing, running out of lubricating oil, overload, etc.), the effect will be affected on the monitor screen. It often appears as a change in the pulse width (on time) of one or two or more on pulses or the pulse width (off time) of off pulses in the pulse train waveform corresponding to each variable.

  For this reason, in order to analyze the operating status of a production line or the like to be controlled by the PLC, a user of this type of monitoring device can display a pulse train waveform for each variable displayed over a plurality of rows on the screen of the monitoring device. In each of these, the on-time or off-time of a plurality of on-pulses or off-pulses must be measured quickly.

In general, in order to obtain a time difference between two arbitrary points from a pulse train waveform display drawn based on a series of collected time-series bit data, two linear shapes for designating each of a start point and an end point are used. A technique using a cursor is known. That is, in this method, the acquisition time of the corresponding bit data is obtained from the position of the cursor for designating the start point, and the acquisition time of the corresponding bit data is obtained from the position of the cursor for designating the end point. The time difference between the two points is obtained.
JP 2005-128721 A JP 2003-21650

  However, in the time difference measurement method using the two cursors described above, each of the two cursors must be separately aligned with the start point and end point of the section to be measured. In addition to taking time, when trying to measure the on-time or off-time, the cursor must be accurately positioned at each of the front and rear edges of the on-pulse or off-pulse, and the operability is extremely poor. there were.

  The present invention has been made paying attention to the above-mentioned problems, and its object is to provide a pulse train corresponding to a series of time-series bit data related to each of a plurality of variables collected by a data collection unit. When the waveform is displayed on the screen of the image display side by side, for example, across multiple lines, the on-time or off-time of any on-pulse or off-pulse can be quickly measured and displayed on the pulse train waveform with a simple operation. It is to provide a method for monitoring collected data.

  Other objects and operational effects of the present invention will be easily understood by those skilled in the art by referring to the following description of the specification.

  In order to achieve the above object, the present invention employs the following configuration. That is, the collected data monitoring method (or apparatus) according to the present invention images a series of time-series bit data corresponding to each of the values at the time of collection of a plurality of variables collected by the data collection unit from the memory of the programmable controller. A method for monitoring via a display, wherein a pulse train waveform corresponding to one or more of a series of time-series bit data relating to each of the collected variables is displayed on the screen of the image display A first step (or means) for displaying a predetermined cursor capable of designating one point in the time axis direction on the pulse train waveform display area, and displaying the predetermined cursor on the pulse train waveform display area; On the pulse train waveform displayed in the one or more rows, on the condition that the confirming operation is detected. A second step (or a step of generating an on time or an off time corresponding to a pulse width of one on pulse or one off pulse to which one point in the time axis direction specified by the data belongs based on the series of time series bit data (or And a third step (or means) for performing on-time display or off-time display corresponding to the on-time or off-time generated in the third step at a predetermined position on the screen. It is characterized by that.

  According to such a configuration, when the on-time of a specific on-pulse or the off-time of an off-pulse is to be measured, a predetermined confirming operation is performed by placing the cursor on any one point included in those on-pulse or off-pulse. Since the on-time or off-time of the on-pulse or off-pulse including the one point is automatically measured and displayed, the labor for aligning the cursor is halved, and the on-time of the pulses existing at various positions or The off time can be measured quickly.

  In the present invention, as the second step (or means), the on / off state at one point in the time axis direction designated by the cursor on each pulse train waveform and the time series bit data of the on / off state before and after Based on the continuity of the on-state or off-state, a time corresponding to the start point and end point of the one on-pulse or one off-pulse is obtained, and one on-pulse or one off-pulse pulse is determined from the start point time and end point time. An on time or an off time corresponding to the width may be generated.

  Here, “on-off state and the continuity of the on-state or the off-state on each time-series bit data of the on-off state” means that both the front edge and the rear edge are before and after a designated point. Of course, when there is only one of the front edge or the rear edge due to the interruption of the data string, or when the ON state or OFF state continues over the entire length of the display area. This means that all cases where both the front edge and the rear edge do not exist are assumed.

  According to such a configuration, display corresponding to the on-time or the off-time can be performed without any trouble regardless of where the cursor is positioned in the pulse waveform display area of the screen.

  Further, the predetermined determination operation of the cursor in the second step (or means) may be that the cursor remains at the same position for a predetermined time or longer after the movement of the cursor is stopped. .

  According to such a configuration, the on time or the off time can be displayed simply by moving the cursor to a desired position and making it stand still without performing a special operation such as a mouse click operation. On the other hand, since the calculation for measuring the on time or the off time is not performed during the movement of the cursor, the movement of the cursor becomes smooth, and the operability can be remarkably improved.

  As the cursor displayed in the first step (or means), a single linear cursor that crosses the pulse train waveform display area in a direction orthogonal to the time axis may be employed.

  According to such a configuration, the on-time or off-time of the on-pulse or off-pulse intersecting the linear cursor can be collectively measured and displayed by collectively specifying the pulse train waveforms arranged in a plurality of rows. Can do.

  Also, a predetermined position on the screen where the on-time display or off-time display is performed in the third step (or means) is provided for each display row of the pulse train waveform of each variable, and each on-time display. Alternatively, an on / off state display may be added to the off time display.

  According to such a configuration, it may happen that it is difficult to determine whether the displayed time is on time or off time because the cursor is positioned just above the front edge or rear edge of the pulse. By checking whether the on / off state display is the on state or the off state, it is possible to easily determine whether the displayed time is the on time or the off time.

  The collected data monitoring method of the present invention described above can also be embodied as a computer program for causing a computer to execute such a method.

  According to the method (or means) for monitoring collected data of the present invention, when measuring the on-time of a specific on-pulse or the off-time of an off-pulse, the cursor is placed on any one point included in those on-pulse or off-pulse. If the predetermined confirmation operation is performed, the on-time or off-time of the on-pulse or off-pulse including that one point is automatically measured and displayed. The on-time or off-time of the pulse existing in can be quickly measured.

  Hereinafter, a preferred embodiment of a method for monitoring collected data according to the present invention will be described in detail with reference to the accompanying drawings.

  A block diagram of a programmable logic controller (hereinafter referred to as PLC) system including a data collection unit (data collection device) is shown in FIG. As shown in the figure, this PLC system is composed mainly of a PLC 10, a personal computer (hereinafter referred to as a PC) 20 that functions as a tool device, and a display 35 that functions as a programmable display. ing. Reference numeral 34 denotes a serial communication line that connects the PLC 10 and the display 35.

  The PLC 10 is configured as a building block type in this example, and various functional units are plugged into a connector on a bus laid on the backplane. As these functional units, in the illustrated example, a CPU unit 11 that plays a central role in control, a communication unit 12 that manages data exchange (not shown) with other PLCs, and an external actuator (relay, electromagnetic A valve, a fluid cylinder, a lamp, etc.) 32 and an external sensor (photoelectric switch, proximity switch, limit switch, etc.) 33, and a data collection device (SPU) related to the main part of the present invention. And.

  The PC 20 functions as means for realizing the monitoring method (or means) according to the present invention, and includes an input device (not shown) including a mouse and a keyboard, an output device including a display device and a printer device, an Ethernet ( It has a communication device for performing information communication such as registered trademark communication, and a main body device including a microprocessor that performs overall control thereof.

  As is well known, the CPU unit constituting the PLC 10 has an I / O between an actual I / O in the I / O unit 13 and an I / O memory (not shown) in the CPU unit 10 or corresponding data in the data memory. The O refresh process, the instruction execution process performed while sequentially reading the user program from the user memory (not shown), and the peripheral service process including communication with the outside via the communication unit 12 are repeated as one cycle, and this is repeated at high speed.

  When the data collection unit (SPU) 15 performs data exchange between the CPU unit 11 and the I / O unit 13 via the bus in the I / O refresh process, the contents of the I / O memory and the data memory (analog variables) , Bit variables) or data corresponding to a specified part is read and stored in a memory (not shown) in the data collection unit (SPU) 15. Thus, a time stamp indicating the collection time is attached to each data in the data string corresponding to each stored variable. In this example, the period of data collection is consequently an integer multiple of the PLC cycle time.

  The PC 20 is configured as a tool device for the PLC 10 and incorporates a user program programming function, a function of downloading to the PLC, a function of uploading from the PLC, a monitor function regarding various data in the PLC and the execution state of the program, and the like. The monitoring method (or means) of the present invention is incorporated as a part of the monitoring function described above.

  That is, the variable data (including bit data and analog data) in the memory of the information collection unit (SPU) 15 attached to the PLC 10 is transmitted from the PLC 10 when the PC 20 and the PLC 10 communicate via the communication line 30. The data is sent to the PC 20, stored in a memory (internal table) in the PC 20, and used for data monitoring via screen display on the PC 20.

  A general flowchart showing the entire display process of the PC 20 executed in connection with the monitoring method (or apparatus) of the present invention is shown in FIG. As shown in the figure, the entire display processing includes data reading processing (step 201), storage processing in an internal table (step 202), graph drawing processing (step 203), and ON / OFF time display processing. Four processes consisting of (Step 204) are included.

  First, a data reading process (step 201) is performed. As described above, this process reads all variable data or pre-designated variable data from the memory of the data collection unit (SPU) 15. It corresponds to processing. As described above, the array of each variable data read in this way corresponds to the variable array in the memory (input / output memory, data memory, etc.) in the PLC 10.

  In the subsequent internal table storage process (step 202), as shown in FIGS. 5C and 6C, the read variable data (in this example, only bit data is shown) is prepared in the PC 20. Stored in the variable table. As is clear from these figures, each variable data (variable No. 1, variable No. 2,...) Has a data index (0, 1, 2,...) And a time stamp (t ) Is attached.

  In the subsequent graph drawing process (step 203), using a known screen display process, for example, as shown in an image diagram of the entire screen in FIG. A pulse train waveform corresponding to one or more of them is displayed side by side on one or two or more rows on the screen of the image display of the PC 20, and at the same time, one point in the time axis direction on the pulse train waveform display area can be designated. A cursor 111 is displayed on the screen.

  Here, the display contents will be specifically described with reference to an image diagram of the entire screen of FIG. As is apparent from the figure, the screen 100 of the image display device is provided with a bit waveform display area 110, an analog waveform display area 120, a bit related information display area 130, and an analog related information display area 140. .

  In the bit waveform display area 110, 16 display rows L1, L2, L3 to L16 in the vertical direction are provided. In each of these display rows L1, L2, L3 to L16, a pulse train waveform corresponding to each of a plurality of bit variables can be displayed. Here, the bit variable means a binary signal that takes two states, an on state and an off state.

  In the analog display area 120, an analog waveform corresponding to each of a plurality of analog variables can be displayed. Here, the analog waveform means a signal that can take an arbitrary analog value such as temperature data, pressure data, and the like. In the case of an analog waveform, since the range of values that can be taken for each variable varies, the display rows L1 to L16 are not provided unlike the bit waveform display area 110. That is, in the analog waveform display area 120, waveforms corresponding to the respective analog variables are displayed so as to be overlapped appropriately. However, since a unique color is assigned to each variable, visibility is not impaired. This also applies to the bit waveform display area 110 described above. That is, a unique color is assigned to each pulse train waveform corresponding to each bit variable.

  A bit related information display area 130 is provided on the right side of the bit waveform display area 110. In the bit related information display area 130, a check box column 131, a waveform color box column 132, an address / comment column 133, a bit value color box column 134, and a bit arranged in the vertical direction, respectively. A value character string 135 and an ON / OFF time box string 136 are provided.

  The check box column 131 determines whether or not to activate the corresponding display row by putting a check mark in the check box column by a cursor operation.

  The waveform color box column 132 is colored with the used color of the pulse column waveform displayed in the corresponding display row. Therefore, it is possible to easily determine what color the variable corresponding to the row is colored in the display area 110.

  In the address / comment column 133, a signal name on the PLC related to the variable of the row is displayed. The signal name can be switched and displayed by either an address name used in the PLC or a comment easy to understand for the user. This switching is executed by operating the switching button 137. The address display state of the address / comment column 133 is shown in FIG. 8, and the comment display state is shown in FIG.

  The bit value color box column 134 is colored in one of two colors corresponding to the ON state or OFF state of the signal at the time of crossing the cursor line 111 on the pulse column waveform corresponding to the row. Therefore, the on / off state at the cursor position of the corresponding signal in the bit waveform display area 110 can be intuitively understood based on the coloring in the bit value color box column 134.

  The bit value character string 135 displays a character string corresponding to an on / off state of a signal at one point intersecting the cursor line 111 in each display row. Accordingly, by referring to the box rows 130 and 135, even if the position indicated by the cursor line 111 is near the edge of the on-pulse or off-pulse on the screen and the on-off state is difficult to determine, the bit value Based on the display of the color box row 134 and the bit character row 135, it can be easily determined whether the state is the on state or the off state.

  The ON / OFF time box column 136 corresponds to a main part of the present invention, and each of these boxes includes an ON pulse or an OFF pulse that crosses the cursor line 111 in the pulse column waveform of the corresponding display row. The time or off time is displayed numerically. Therefore, on-time or off-time corresponding to the pulse width of any on-pulse or off-pulse can be easily determined based on this numerical display. As will be described later, the numerical value corresponding to the on time or the off time is displayed in each box after the ON / OF time display process (step 204) shown in FIG. At the stage of the graph display process (step 203), numerical values are not yet displayed.

  An analog related information display area 140 is provided on the right side of the analog waveform display area 120. The analog related information display area 140 is provided with a check box column 141, a waveform color box column 142, an address / comment column 143, and an analog value box column 144, which are arranged in the vertical direction. . The check box column 141, the waveform color box column 142, and the address / comment column 143 are the same as the check box column 131, the waveform color box column 132, and the address / comment column 133 included in the bit related information display area 130, respectively. The description will be omitted.

  In the analog value box column 144, the value of the analog data at the time when the cursor line 111 is shown on each analog waveform identified by color is numerically displayed. Therefore, the value of the analog data at an arbitrary cursor position in the time axis direction can be easily determined by the numerical display in the analog value box column 144.

  In the above description, the cursor line 111 is a straight cursor line that crosses the bit waveform display area 110 and the analog waveform display area 120 in the vertical direction, as is apparent from the figure. That is, the cursor line 111 is a straight cursor line that crosses the waveform display area in a direction orthogonal to the time axis.

  Returning to the flowchart of FIG. 2, in the ON / OFF time display processing 204, the cursor is displayed on the pulse train waveform displayed in the one line or two or more lines on condition that a predetermined confirming operation of the cursor is detected. A process for generating an on time or an off time corresponding to a pulse width of an on pulse or an off pulse at a position to which one point in the time axis direction designated by Processing for performing on-time display or off-time display corresponding to the off-time at a predetermined position on the screen is executed.

  A detailed flowchart of the ON / OFF time display process is shown in FIG. In the figure, when processing is started, it is determined whether the cursor has moved or stopped (step 302) while repeatedly checking the movement of the cursor (step 301). In other words, in this example, the predetermined confirmation operation of the cursor is realized not by an operation of a click button or the like but merely by maintaining the cursor in a stopped state for a certain time or more.

  A detailed flowchart of the cursor movement determination process is shown in FIG. When processing is started in the figure, after starting the timer (step 401), based on the cursor coordinates detected by a known method, whether the cursor has moved (step 402) and whether the timer has timed out (Step 403) is repeatedly determined.

  Here, if it is determined that the cursor has moved (YES in step 402), it is determined that the cursor has moved (step 405), while the cursor remains stationary (NO in step 402). If the timer has expired (step 403 YES), it is determined that the cursor has not moved (step 404).

  As a result, the user can move the linear cursor 111 extending in the vertical direction to an arbitrary position in the time axis direction, and then stop the cursor at the position for a predetermined time or more, so that the cursor confirmation operation is recognized. As will be described later, calculation for display is automatically started. Returning to FIG. 3 again, if it is determined that the cursor does not move (NO in step 302), then a process for obtaining the data index pointed to by the cursor (step 303) and a process for acquiring the current ON / OFF state (step 304). ) Are executed sequentially.

  Here, as shown in FIGS. 5C and 6C, an internal table provided in the memory of the PC 20 includes a numerical value indicating a data index and a time stamp (t) indicating a data acquisition time. And a data string indicating the on / off state of each of the plurality of variables obtained at the data acquisition time are stored in a time series as a pair. Therefore, in the previous steps 303 and 304, the corresponding data index is obtained based on the cursor coordinates, and each of the plurality of variables (variable No. 1, variable No. 2,...) Corresponding to the data index is turned on / off. The state is generated based on the internal table.

  Subsequently, a calculation process (step 305) of the front state change point (t1) is executed. As shown in FIG. 5A, in the forward state change point calculation process, first, while decrementing the data index one by one, whether the ON / OFF state has changed each time (step 502) and the head It is determined whether data has been reached (step 503).

  As shown in FIG. 5B, if the data index pointed to by the cursor 111 is “3”, the data index decrement process (step 501) is repeated twice, thereby changing the data index to “ If you return from “3” to “1”, the variable No. Regarding 1, the state change from the on state (“1”) to the off state (“0”) is recognized. At this time, the value of the time stamp (t) (2005/01/01 01:00:01) is obtained corresponding to the data index “1”.

  On the other hand, as a result of decrementing the data index on the internal table (step 501), if the ON / OFF state remains unchanged (NO in step 502) and the top data has been reached (step 503), similarly, A time stamp value (2005/01/01 01: 00: 00: 00) corresponding to the data index “0” is calculated.

  This is conceptually shown in the pulse train waveform of FIG. That is, as a result of executing the processing shown in the flowchart of FIG. 5A, the position indicated by the cursor 111 is the data index “3”, while the time corresponding to the time t1 that is the “starting point” of the on-pulse. Stamp data is automatically acquired.

  Returning to the flowchart of FIG. 3 again, the calculation process (step 306) of the rear state change point (t2) is executed. As shown in FIG. 6A, when the process is started, the data index is incremented by 1 (step 601), and each time the ON / OFF state changes (step 602) and the final data is displayed. The determination of whether or not it has been reached (step 603) is repeatedly executed.

  Then, as shown in FIG. 6B, since the initial cursor position is the data index “3”, it is turned ON when the data index is incremented twice and the value of the data index becomes “5”. / OFF state change is detected (YES in step 602), and the value of the time stamp (2005/01) corresponding to the data index “4” (returns one index) corresponding to the time t2, which is the “end point” of the on-pulse immediately. / 01 01:00:04) is acquired.

  On the other hand, as a result of continuing incrementing the data index (step 601), when the ON / OFF state remains unchanged (NO in step 602) and the final data is reached (YES in step 603), the data index “7” is similarly processed. ”(2005/01/01 01:00:07) corresponding to the time stamp (t) is calculated (step 604).

  Returning to FIG. 3 again, a time difference calculation process is subsequently executed (step 307). As shown in FIGS. 7A and 7B, when the above backward process and forward process are completed, the data index “4” corresponds to the backward state change, and the forward state change also occurs. The data index “1” is acquired, and two pieces of time information (2005/01/01 01:00:04, 2005/01/01 00:00:01) are obtained based on the data index “1”. Accordingly, by subtracting the time information indicated by these time stamps, the on time or off time corresponding to the pulse width of the on pulse or off pulse indicated by the cursor 111 is obtained.

  Returning again to FIG. 3, the time difference information thus obtained is finally displayed on the screen 100 (step 308). As shown in FIG. 9A, when the cursor 111 is positioned on the on-pulse in the pulse train of the display train L1, for example, the cursor 111 is located on the on-pulse in the ON / OFF time box train 136. Depending on whether it is located on the off pulse, the on time or off time is displayed numerically.

  As shown in FIG. 5B, when the cursor 111 is on an off pulse on the pulse train waveform corresponding to the display row L1, the ON / OFF time box row 136 corresponding to each display row is similarly The ON time or OFF time of the ON pulse or OFF pulse indicated by the cursor position is numerically displayed.

  At this time, as apparent from the figure, the on-time display or the off-time display (136) is provided with an on / off state display (134, 135) adjacent thereto, so that the cursor line 111 is turned on or off, for example. Even when the relationship between the cursor line and the waveform edge is difficult to see because it is located at the front and rear edge positions of the off pulse, it is not mistaken whether the displayed numerical value represents the on time or the off time.

  Finally, an explanatory diagram showing the data structure of the table is shown in FIG. The variable table shown in FIG. 9A is read from the data collection unit (SPU) 15 and is stored in the PC 20, and the internal table shown in FIG. Created. As described above, this internal table stores a plurality of variables acquired at a time for each time stamp corresponding to the data acquisition time, and accumulates this for each data index as one record. It is constructed in time series.

  FIG. 11 shows the details of the main parts of the front state change point calculation process (step 305) and the rear state change point calculation process (step 306) described above. As shown in FIG. 6A, when there are state change points before and after the position indicated by the cursor 111, the start point and the end point can be recognized based on the state change. Also, as shown in FIG. 5B, when the data is interrupted behind the position indicated by the cursor 111, the on time or the off time is calculated from the point at which the data was interrupted. Furthermore, as shown in FIG. 6C, when there is no state change point before and after the position indicated by the cursor 111 and the data is interrupted, The on-time or off-time is calculated with the point of interruption as the start point and end point.

  Therefore, even when the acquired variable happens to change from the on state to the off state, from the off state to the on state, or there is no state change at all in the display area of the screen, the on time display or off time is displayed. There is an advantage that display cannot be disabled in display.

  According to the present invention, when the on-time of a specific on-pulse or the off-time of an off-pulse is to be measured, if a predetermined confirming operation is performed by placing the cursor on any one point included in those on-pulse or off-pulse, Since the on-time or off-time of an on-pulse or off-pulse including one point is automatically measured and displayed, the labor for aligning the cursor is halved, and the on-time or off-time of pulses present at various positions Can be measured quickly.

It is a block diagram of a PLC system including a data collection unit. It is a general flowchart which shows the whole display process of PC. It is a detailed flowchart of ON / OFF time display processing. It is a detailed flowchart of a cursor movement determination process. It is a detailed flowchart of a state change point calculation process ahead. It is a detailed flowchart of a rear state change point calculation process. It is explanatory drawing of a time difference calculation process. It is an image figure of the whole screen. It is a screen image figure explaining the effect | action of this invention. It is explanatory drawing which shows the data structure of a table. It is a figure which shows the modification of the calculation aspect of ON time. It is a figure which shows the screen principal part in a comment display state.

Explanation of symbols

10 Programmable logic controller (PLC)
11 CPU unit 12 Communication unit 13 I / O unit 15 Data collection unit (SPU)
20 Personal computer (PC)
30 Information System Network 31 Input / Output Signal Line 32 Actuator 33 Sensor 34 Serial Communication Line 35 Display 100 Screen 101 Left Shift Button 102 Centering Button 103 Right Shift Button 110 Bit Waveform Display Area 111 Linear Cursor Line 120 Analog Waveform Display Area 130 Bit related information display area 131 Check box row 132 Waveform color box row 133 Address / comment row 134 Bit value color box row 135 Bit value character string 136 ON / OFF time box row 137 Switch button 140 Analog related information display region 141 Check box row 142 waveform color box column 143 address / comment column 144 analog value box column L1 to L16 display line t1 start point t2 end point

Claims (5)

A method for monitoring, via an image display, a series of time-series bit data corresponding to each of the collection time values of a plurality of variables collected from a memory of a programmable controller by a data collection unit,
A pulse train waveform corresponding to one or more of a series of time-series bit data related to each of the collected variables is displayed side by side on one or more lines on the screen of the image display; A first step of displaying a predetermined cursor capable of designating one point in the time axis direction on the pulse train waveform display region;
On the condition that a predetermined confirming operation of the cursor is detected, one on-pulse to which one point in the time axis direction designated by the cursor belongs on the pulse train waveform displayed on the one line or two or more lines A second step of generating an on time or an off time corresponding to a pulse width of one off pulse based on the series of time-series bit data;
A third step of performing on-time display or off-time display corresponding to the on-time or off-time generated in the third step at a predetermined position on the screen,
A method for monitoring collected data. In the second step, the on / off state at one point in the time axis direction designated by the cursor on each pulse train waveform and the continuity of the on / off state before and after each on the time-series bit data of the on / off state Based on the above, the time corresponding to the start point and end point of the one on pulse or one off pulse is obtained, and the on time or off time corresponding to the pulse width of one on pulse or one off pulse from the start point time and end point time Generate
The method for monitoring collected data according to claim 1. An apparatus for monitoring a series of time-series bit data corresponding to each value at each collection time of a plurality of variables collected from a memory of a programmable controller by a data collection unit via an image display,
A pulse train waveform corresponding to one or more of a series of time-series bit data related to each of the collected plurality of variables is displayed side by side over one or more lines on the screen of the image display; First means for displaying a predetermined cursor capable of designating one point in the time axis direction on the pulse train waveform display region;
On the condition that a predetermined confirming operation of the cursor is detected, one on-pulse to which one point in the time axis direction designated by the cursor belongs on the pulse train waveform displayed on the one line or two or more lines Second means for generating an on time or an off time corresponding to a pulse width of one off pulse based on the series of time-series bit data;
And third means for performing on-time display or off-time display corresponding to the on-time or off-time generated in the third step at a predetermined position on the screen,
An apparatus for monitoring collected data. The second means is a continuity between the on / off state at one point in the time axis direction designated by the cursor on each pulse train waveform and the on / off state before and after each on the time-series bit data of the on / off state. Based on the above, the time corresponding to the start point and end point of the one on pulse or one off pulse is obtained, and the on time or off time corresponding to the pulse width of one on pulse or one off pulse from the start point time and end point time Generate
The collected data monitoring apparatus according to claim 3.   A computer program for causing a computer to execute the method according to claim 1.

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