JP3715499B2 - Control device monitor system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention monitors the operation of a control device widely used for control of steel plants, paper manufacturing plants, assembly plants in the automobile industry, etc., chemical plants, water supply and sewage systems, and other industrial systems. The present invention relates to a monitor system for a control device.
[0002]
[Prior art]
FIG. 12 is a diagram illustrating a configuration of a monitor system of a conventional control device. The control device monitor system shown in FIG. 1 includes a control device 51 that executes a predetermined control program for controlling an industrial system, a monitor device 52 that displays a result of the control device 51 executing the control program, and the like. This is a configuration having a transmission line 53 that connects the control device 51 and the monitor device 52.
[0003]
FIG. 13 is a flowchart of processing when the control device 51 executes a control program. As shown in the figure, the control device 51 inputs / outputs variable data to / from a control object not shown in step 50, executes the control program in step 51, and executes the control program in step 52. When the process is completed, the variable data is transmitted to the monitor device 52. In step 53, it is determined whether or not all scans have been completed. If all scans have not been executed, the process returns to step 50 and the control program is repeatedly executed a predetermined number of times. Here, one scan means that the control program is executed one by one. The monitor device 52 displays the variable data received from the control device 51 and the same control program executed by the control device 51.
[0004]
The variable data and the control program used in this way are displayed because the control device 51 is controlled by the influence of external noise when the placement location of the control device 51 is a plant production line or a place where a strong magnetic field is generated. It is conceivable that the execution result of the control program is erroneous due to the malfunction of the device 51. In addition, when the control device 51 operates at high speed, the input / output of variable data may fail and the execution result of the control program may be erroneous. This is because the validity of the execution result by the control device 51 can be monitored through the display screen of the monitor device 52.
[0005]
[Problems to be solved by the invention]
However, in the conventional monitor system of the control device, the monitor device 52 merely displays the variable data transmitted from the control device 51 together with the control program. Was performed by the operator. For this reason, when the control program calculates simple logic, the correctness of the execution result can be determined. However, when calculating a complicated logic, the analysis takes time and the determination becomes difficult. There was a problem.
[0006]
The present invention has been made in view of the above, and an object of the present invention is to provide a control device that allows an operator to easily and accurately determine the validity of the result of execution of a control program by the control device. To provide a monitor system.
[0007]
[Means for Solving the Problems]
To achieve the above objective, First The monitoring system for a control device according to the present invention includes an execution result transmitting means for transmitting a result of execution of a control program by the control device to a monitor device operating under a predetermined condition different from that of the control device, and An execution unit that is provided and executes the same control program as the control program executed by the control device, an execution result transmitted by the execution result transmission unit, and an execution result obtained by the execution unit are displayed. And a display means.
[0008]
In the present invention, the execution result of execution of the control program by the control device and the monitor device that operates under conditions more advantageous than the control device are executed by the control device in order to verify the execution result of the control device. By displaying the execution results of executing the same control program, it is possible to compare the execution results of the control device with the accurate execution results of the monitor device, and easily determine the validity of the execution results of the control device I can do it.
[0009]
Second The present invention is First In the monitoring system for a control device, the predetermined condition is that the environment in which the monitor device is disposed is less susceptible to noise than the environment in which the control device is disposed.
[0010]
Third The present invention is 1st or 2nd In the monitor system of the control device, the predetermined condition is that the monitor device operates at a lower speed than the control device.
[0011]
2nd and 3rd In the present invention, when the control device is arranged in an environment susceptible to noise such as a production line with a strong magnetic field, or because the control device operates at high speed, input / output of variable data fails. If there is a risk, place the monitor device in an environment that is not easily affected by noise, such as a control room, or operate the monitor device at low speed to ensure that the monitor device can obtain accurate execution results. The correctness of the execution result by the control device can be accurately determined.
[0012]
4th The present invention is Any one of the first to third In the monitor system of the control device, the execution result transmitting means transmits the execution result in the monitor range designated for the control program.
[0013]
5th The present invention is Any one of the first to fourth In the monitoring system for the control device, the control device is configured to collect the variable data used by the control program in the designated monitor range, and to monitor the variable data collected by the collection device in the order in which the variable data is used. And a variable transmission means for transmitting to the apparatus.
[0014]
4th and 5th In the present invention, the execution results and variable data in the designated monitor range are transmitted to the monitor device, so that an enormous amount of execution results and variable data are limited to a certain range, which is efficient. In addition, the validity of the execution result by the control device can be determined.
[0015]
In addition, since the variable data is transmitted to the monitor device in the used order, the variable data is the same as the variable data actually used by the control device by using the variable data according to the received order. Based on the above, the control program can be executed so that the correctness of the execution result by the control device can be accurately verified.
[0016]
6th The present invention is 5th In the monitoring system of the control device, the monitoring device has storage means for storing the variable data transmitted by the variable transmission means in association with the variable name based on the execution procedure of the control program. .
[0017]
In the present invention, the variable data transmitted from the control device is stored in the monitor device in association with the variable name based on the execution procedure such as the order of appearance of the variables in the control program. The variable data used in the device is correctly associated with the variable data used by the monitor device, so that the same calculation as the control device can be performed in the monitor device. Judgment can be made.
[0018]
7th The present invention is 6th In the monitor system of the control device, the monitor device includes a selection unit that selects the variable data stored by the storage unit and the variable data set separately from the variable data, and the execution unit includes the selection unit. The gist is to execute the control program using the variable data selected by the means.
[0019]
In the present invention, the variable data stored by the storage means and the variable data arbitrarily set separately from this can be selected, so that when the error is verified in the execution result by the control device Is to select the variable data that is arbitrarily set and use it for the verification operation of the execution result by the control device, to determine whether the cause of the error in the execution result is due to the input variable data. It is possible to determine whether the result is logic or not, and the correctness of the execution result by the control device can be determined more accurately.
[0020]
8th The present invention is Any of 1st to 7th In the monitor system of the control device, the display means is an order in which the execution result by the control device, the execution result by the monitor device, and the variable data used by at least one of the control device or the monitor device are designated. The gist is to display with.
[0021]
According to the present invention, the execution result by the control device, the execution result by the monitor device, and the used variable data are displayed in a specified order so that the operator can view them side by side for easy viewing. Thus, the difference between the execution result by the control device and the execution result by the monitor device can be easily determined.
[0022]
9th The present invention is Any of 1st to 8th The control device monitoring system of the present invention is characterized in that the control device has execution means for executing the control program for each step or each scan.
[0023]
In the present invention, since the control device executes the control program for each step or each scan, the amount of variable data transmitted from the control device to the monitor device is enormous, and the transmission is performed in the control device. When the control program is delayed compared to the execution of the control program, it is possible to allow the control device to wait for an appropriate time so that the monitor device can reliably collect all the variable data from the control device.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a monitor system of the control device according to the first embodiment. It is assumed that the control device 1 in the figure is arranged on a production line with a strong magnetic field, for example, and may cause a malfunction due to external noise. The control device 1 is connected via a transmission line 3 to a monitor device 2 disposed in an environment that is not easily affected by noise such as a control room.
[0026]
First, the configuration and operation of the control device 1 will be described.
[0027]
The control device 1 shown in FIG. 1 is used to execute a control program, a CPU 11 that controls the overall operation of the control device 1, a sequence arithmetic processor 14 that executes a control program, a control program memory 15 that stores the control program, and the like. A data memory 16 for storing variable data, a program memory 12 for storing a program for operating the entire control device 1, a work memory 13 for working when executing the control program, a CPU 11 and other components A system bus 17 for connecting elements, a communication interface 18 connected to the transmission path 3 for communicating with the monitor device 2, and a variable data input / output for a control object (not shown) The configuration includes an input / output (I / O) interface 19.
[0028]
FIG. 2 is a diagram illustrating a configuration of the sequence calculation processor 14. The sequence arithmetic processor 14 in the figure includes a sequence instruction pointer 403 for storing the address of the control program being executed, a sequence instruction register 404 for storing the code of the sequence instruction being executed, and an operation target of the sequence instruction. Operand data register 405 for storing data to be stored, monitor start address register 406 for storing a monitor start address corresponding to the monitor range designated by the monitor device 2, and monitor for storing a monitor end address End address register 407, monitor instruction address register 408 for storing the address of the instruction in the monitor range, contents of address registers 406 to 408, sequence instruction pointer 403, sequence instruction register 404, operand data register 4 5 is compared to the comparison circuit 409 that transmits the fact to the data storage control circuit 410 when it matches, and the start and stop timings for storing the variable data are controlled, and the variable data to be stored is executed. In addition to the control of the entire operation for storing the variable data and the operation such as the determination based on the type of instruction in the data storage control circuit 410 for sending an interrupt signal to the CPU 11 via the system bus 17 when necessary, the control program is 1 A step monitor designation flag 411 used when the execution is interrupted every time step execution is performed to synchronize with the monitor device 2, a counter 412 that counts the number of variable data accumulated in the data accumulation memory 413, and data accumulation Data used to store variable data in units such as bit data and word data A configuration having a product memory 413, a sequence operation circuit 401 that executes a control program read from the control program 15 via the system bus 17, and an internal register 402 that temporarily stores variable data necessary for execution of the operation It is. Note that the sequence arithmetic processor 14 may be one in which equivalent logic is realized by software.
[0029]
The sequence arithmetic processor 14 reads the control program from the control program memory 15 after an external control target state is input via the I / O interface 19, and stores variables in the data memory 16 as necessary. The control program is executed while accessing the data, and the execution result is output to an external control target via the I / O interface 19. When the monitor range is designated by the monitor device 2, the variable data for input used in the monitor range when executing the control program and the variable data for output indicating the execution result are accumulated in time series. Then, the accumulated variable data is transmitted to the monitor device 2 via the communication interface 18.
[0030]
FIG. 3 is a flowchart of processing when the control device 1 executes the control program.
[0031]
First, variable data is input / output to / from the controlled object via the I / O interface 19 in step 10, and execution of the control program is started in step 11.
[0032]
In step 12, the sequence calculation processor 14 sets the monitor start address sent from the CPU 11 corresponding to the monitor range designated by the monitor device 2 in the monitor start address register 406, and similarly monitors the monitor end address. Set in the address register 407.
[0033]
When executing the control program, the comparison circuit 409 compares the value of the sequence instruction pointer 403 with the value of the monitor start address register 406. When a coincidence between the two is detected, the data accumulation control circuit 410 stores necessary variable data after that in the data accumulation memory 413 and updates the value of the accumulated data counter 412. The variable data stored here includes, in addition to variable data used for input, variable data for output indicating execution results. If the value of the instruction pointer 403 matches the value of the monitor end address register 407, or the value of the accumulated data counter 412 reaches a specified value, the data accumulation control circuit 410 notifies the CPU 11 accordingly.
[0034]
In step 13, the CPU 11 transmits monitor data to the monitor device 2 via the communication interface 18. This monitor data includes collected variable data for input and variable data for output indicating the execution result.
[0035]
In step 14, the remaining control program is executed. In step 15, it is determined whether or not all scans have been completed, that is, whether or not the execution of the control program has been repeated a predetermined number of times. If all scans have not been completed, the process returns to step 10. The above process is repeated, and when all the scans are completed, the control program execution process is terminated.
[0036]
As described above, the control device 1 can collect the variable data for input used by the control program in the monitor range in time series in accordance with the order of use and transmit it to the monitor device 2.
[0037]
Next, the configuration and operation of the monitor device 2 will be described.
[0038]
FIG. 4 is a diagram illustrating a configuration of the monitor device 2. The monitor device 2 in FIG. 1 includes a CPU 201 that controls the overall operation, a control program memory 204 that stores the same control program as the control program stored in the control device 1, and a data memory 205 that stores variable data. A program memory 202 storing a program for operating the entire monitor device 2, a work memory 203 for work when executing the control program, and a system bus 207 for connecting the CPU 201 and other components. A communication interface 208 connected to the runway 3 to communicate with the control device 1, an input device 210 configured by a keyboard or the like for an operator to specify a monitor range or variable data, An I / O interface 209 for connecting the input device 210 to the system bus 207; A display device 211 for displaying a program and variable data such as a structure having a display interface 206 for connecting the display device 211 to system bus 207.
[0039]
FIG. 5 is a flowchart of processing when the monitor device 2 executes the control program. As a preparation for starting this process, the operator of the monitor device 2 uses the display device 211 and the input device 210 to specify the monitor range of the control program. The designated monitor range is transmitted to the control device 1 via the communication interface 208 and is also stored in the work memory 203.
[0040]
In step 21, when the operator gives an instruction to verify the execution result of the control program by the control device 1, the CPU 201 recognizes this instruction and proceeds to step 22.
[0041]
In step 22, the CPU 201 reads the monitor range control program from the control program memory 204.
[0042]
In step 23, the process continues to wait until monitor data is received from the control device 1. As described above, the monitor data is composed of input variable data and output variable data indicating execution results. When the monitor data is received, the process proceeds to step 24, and the monitor data is stored in the data memory 205 in association with the variable name by a method described later.
[0043]
In step 25, the execution of the control program is started. In step 26, the execution result data is stored in the work memory 203. To display.
[0044]
In step 28, it is determined whether or not all scans have been completed. If all scans have not been completed, the process returns to step 21 and the above processing is repeated. If all scans have been completed, control program execution processing is performed. finish.
[0045]
Next, a method for associating the monitor data transmitted from the control device 1 with the variable name in the monitor device 2 will be described.
[0046]
FIG. 6 is a diagram illustrating an example of a state in which the control device 1 has compiled the control program. FIG. 5A shows an example when the control program is expressed as a source program. Here, a program is shown in which the result of adding variable D to the product of variable B and variable C is substituted into variable A.
[0047]
FIG. 5B shows an example in which this source program is compiled and converted into a sequence instruction. Here, the source program is transformed into a format corresponding to the type of sequence instruction, and the order of the instructions is also changed to the reverse Polish format.
[0048]
“LD” is a mnemonic notation of an instruction for assigning the contents of an operand to an accumulator. “MUL” is a mnemonic notation of an instruction for assigning the product of the contents of the operand and the contents of the accumulator to the accumulator. “ADD” is a mnemonic notation for assigning the sum of the contents of the operand and the contents of the accumulator to the accumulator. “ST” is a mnemonic notation for assigning the contents of the accumulator to the operand. In this state, the variable is still treated as a variable name.
[0049]
FIG. 2C shows an example in which this sequence instruction sequence is further compiled and converted into a machine language. Here, the instruction word is converted into an instruction code, and the variable name is converted into a physical address where the variable is stored. The control program actually executed by the control device 1 is a program in the machine language format. Therefore, the variable data collected by the control device 1 within the monitor range is collected in the order of the machine language.
[0050]
FIG. 7 is a diagram illustrating the order of monitor data transmitted from the control device 1 to the monitor device 2. The monitor device 2 can know in advance the order of the monitor data transmitted from the control device based on the order of variable names, sequence command sequence, etc. in the monitor range of the control program held by itself.
[0051]
Therefore, the monitor device 2 prepares a correspondence table between variable names and addresses on the data memory 205 for storing the contents as shown in FIG. 8 in the work memory 203 in advance, and the monitor transmitted by the control device 1. Data, that is, the contents of the variable B, the contents of the variable C, and the like are stored at corresponding addresses in the data memory 205. In this way, the monitor device 2 can store the variable data transmitted from the control device 1 in association with the variable name.
[0052]
Next, a method for displaying the execution result data by the control device 1 and the execution result data by the monitor device 2 on the display device 211 will be described.
[0053]
FIG. 9 is a diagram illustrating the structures of the data memory 205 and the verification data memory 501 of the monitor device 2. The monitor device 2 stores the variable data sent from the control device 1 at a predetermined physical address in the data memory 205 as shown in FIG. 5A, and as shown in FIG. A verification data memory 501 is created in the work memory 203 as a comparison memory.
[0054]
The verification data memory 501 stores only the input variable data among the variable data sent from the control device 1. As the output variable data indicating the execution result, the execution result calculated by the CPU 201 of the monitor device 2 using the input variable data is stored.
[0055]
The control program used in FIG. 6 will be described as an example. Variable B, variable C, and variable D correspond to input variable data, and variable A corresponds to output variable data. That is, in the verification data memory 501, the contents of the variables B, C, and D transmitted from the control device 1 and the variable A indicating the result of the CPU 201 executing the control program using these variables are stored. The contents of 'are stored.
[0056]
FIG. 10 is a diagram illustrating an example of a display format on the screen of the display device 211. The contents corresponding to the items such as the number of executions of the control program, the variable A indicating the execution result by the control device 1, the variable A ′ indicating the execution result by the monitor device 2, the input variable B, the variable C, the variable D, etc. Displayed in the format. In order to realize this display, the monitor device 2 is provided with a data table identical to the data table of FIG. 10 in the work memory 203, and this data table is read and displayed.
[0057]
Each item of the data table provided in the work memory 203 can be rearranged in the order designated by the operator using the input device 210, and each item can be rearranged in any order for easy comparison. Are displayed on the screen of the display device 211.
[0058]
For example, as shown in the figure, when the variable A indicating the execution result by the control device 1 and the variable A ′ indicating the execution result by the monitor device 2 are displayed side by side, the difference between the two can be easily understood and executed. Since the content of the variable A for the second time is 40, whereas the content of the variable A ′ is different from 53, it can be easily determined that the execution result by the control device 1 is incorrect.
[0059]
Therefore, according to the present embodiment, the execution result of the control device 1 executing the control program and the monitor device 2 arranged in an environment less susceptible to noise than the control device 1 for verifying the execution result. Display the execution results of executing the same control program as that executed by the control device 1 on the display device 211, thereby comparing the execution results of the control device 1 with the accurate execution results of the monitor device 2. Therefore, it is possible to easily determine the validity of the execution result by the control device 1.
[0060]
In addition, according to the present embodiment, the control device 1 collects and transmits the execution result in the designated monitor range and the variable data used by the control program in the monitor range, so that an enormous amount of variables can be transmitted. Since the data is limited to a certain range, the validity of the execution result by the control device 1 can be determined efficiently. In addition, by transmitting the variable data collected by the control device 1 to the monitor device 2 in the used order, the monitor device 2 uses the variable data according to the received order so that the variable actually used by the control device 1 is obtained. Since the control program can be executed based on the same variable data as the data, the correctness of the execution result by the control device 1 can be accurately determined.
[0061]
Further, according to the present embodiment, the monitor device 2 stores the variable data transmitted from the control device 1 in association with the variable name based on the appearance order of the variables in the control program. The variable data used in the control device 1 can be made to correspond correctly to the variable data used by the monitor device 2, and the same calculation as that executed in the control device 1 can be performed in the monitor device 2. The correctness of the execution result by the control device 1 can be accurately determined.
[0062]
Furthermore, according to the present embodiment, the execution result by the control device 1, the execution result by the monitor device 2, and the variable data for input used are displayed on the display device 211 in a specified order. Thus, the operator can display the images side by side so that the operator can easily see them. Therefore, the difference between the execution result by the control device 1 and the execution result by the monitor device 2 can be easily determined.
[0063]
In the present embodiment, when the control device 1 is placed in an environment that may cause malfunction due to external noise, the monitor device 2 is placed in an environment that is not easily affected by external noise such as a control room. However, as another example, when there is a possibility that input / output of variable data may fail because the control device 1 operates at high speed, the monitor device 2 is used as the control device. An accurate execution result may be obtained by operating at a speed lower than 1.
[0064]
Further, when the entire control device 1 is configured only by hardware, the same processing as the control device 1 is performed by different operations by configuring the monitor device 2 by software and hardware. The failure of the control device 1 may be found.
[0065]
[Second Embodiment]
The basic configuration of the monitor system of the control device according to the second embodiment of the present invention is the same as that of the first embodiment, and the feature is that the execution result of the control device 1 in the monitor device 2 The variable data for input used for verifying can be arbitrarily set.
[0066]
FIG. 11 is a diagram illustrating a mechanism that allows variable data for input to be arbitrarily set. The CPU 201 of the monitor device 2 prepares a setting data memory 502 in the work memory 203 in addition to the verification data memory 501 shown in FIG. 9B according to an instruction given by the operator using the input device 210. To do. The structure of the setting data memory 502 is the same as that of the verification data memory 501, and variable data sent from the control device 1 is stored, while the operator can arbitrarily change the variable data. It has become.
[0067]
In step 31, the operator selects a data memory used for verification as the verification data memory 501 or the setting data memory 502 by designating a data selection flag. In step 32, the variable data stored in the selected data memory is used for the calculation for verification, and the verification result is transmitted to the display device 211 in step 33.
[0068]
Therefore, according to the present embodiment, when the variable data transmitted from the control device 1 and the arbitrarily set variable data can be selected, an error occurs in the execution result of the control program. , Selecting arbitrarily set variable data and using it for the verification operation of the execution result by the control device 1 to determine whether the error of the execution result is due to the input data or the control logic Therefore, the validity of the execution result can be determined more accurately.
[0069]
[Third Embodiment]
The basic configuration of the monitor system of the control device according to the third embodiment of the present invention is the same as that of the first embodiment, and the feature is that the execution speed of the control device 1 is generally high. Therefore, in view of the fact that it is difficult to collect and verify all the execution results of the control program by the control device 1 with the monitor device 2, when verifying the execution result of the control program by the control device 1, That is, the apparatus 1 is caused to execute the control program for each step or each scan.
[0070]
When causing the control device 1 to execute the control program for each step, the CPU 201 of the monitor device 2 notifies the CPU 11 of the control device 1 to that effect. The CPU 11 of the control device 1 sets a step monitor designation flag 411 inside the sequence arithmetic processor 14 shown in FIG. When the step monitor designation flag 411 is set, the sequence calculation processor 14 executes the sequence command one step (one command) at a time and outputs an interrupt signal 414 to the CPU 11 every time one step is executed. Wait for instructions from the operator to start. The CPU 11 transmits the contents of the variable data stored in the data storage memory 413 to the monitor device 2 every time the interrupt signal 414 is input. In this way, the execution result of the control device 1 can be monitored for each step.
[0071]
When the control device 1 executes the control program for each scan, the CPU 201 of the monitor device 2 notifies the CPU 11 of the control device 1 to that effect. At this time, the CPU 11 of the control device 1 stores the scan execution mode, and after the sequence calculation processor 14 executes one scan of the control program, the monitor device 2 displays the contents of the variable data stored in the data storage memory 413. And waits for instructions from the operator to start the next scan. In this way, the execution result of the control device 1 can be monitored for each scan.
[0072]
Therefore, according to the present embodiment, since the control device 1 executes the control program for each step or each scan, the amount of variable data transmitted from the control device 1 to the monitor device 2 is enormous. When the transmission time is delayed as compared with the execution time of the control program in the control device 1, the operation in the control device 1 can be waited for an appropriate time. Variable data can be collected reliably.
[0073]
In the present embodiment, only the control device 1 executes the control program for each step or each scan. However, the monitor device 2 may execute the control program for each step or each scan. Good.
[0074]
In such a case, it is possible to cause the control device 1 and the monitor device 2 to execute the control program for each step or each scan, and to compare the execution results of both in real time.
[0075]
【The invention's effect】
As explained above, First According to the present invention, it is possible to compare the execution result by the control device and the accurate execution result by the monitor device, so that the validity of the execution result by the control device can be easily determined.
[0076]
2nd and 3rd According to the present invention, since the monitor device is placed in an environment that is not easily affected by noise such as a control room, or the monitor device is operated at a low speed, an accurate execution result can be reliably obtained by the monitor device. It is possible to accurately determine the validity of the execution result by the control device.
[0077]
4th and 5th According to the present invention, since an enormous amount of execution results and variable data are limited to a certain range, the validity of the execution results by the control device can be determined efficiently.
[0078]
6th According to the present invention, the variable data used in the control device can be made to correspond correctly to the variable data used by the monitor device, and the same calculation as that executed in the control device can be performed in the monitor device. Therefore, it is possible to accurately determine the validity of the execution result by the control device.
[0079]
7th According to the present invention, since it is possible to determine whether the cause of the error in the execution result is due to the input variable data or the logic of the control program, the validity of the execution result by the control device can be determined. Can be determined more accurately.
[0080]
8th According to the present invention, the execution result by the control device, the execution result by the monitor device, and the used variable data can be displayed side by side so that the operator can easily view them. Can be easily determined.
[0081]
9th According to the present invention, since it is possible to wait for an appropriate time for calculation in the control device, the monitor device can reliably collect all the variable data from the control device.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a monitor system of a control device according to a first embodiment.
FIG. 2 is a diagram illustrating a configuration of a sequence calculation processor 14;
FIG. 3 is a flowchart of processing when the control device 1 executes a control program.
4 is a diagram showing a configuration of a monitor device 2. FIG.
FIG. 5 is a flowchart of processing when the monitor device 2 executes a control program.
FIG. 6 is a diagram illustrating an example of a state in which the control device 1 has compiled a control program.
7 is a diagram illustrating the order of monitor data transmitted from the control device 1 to the monitor device 2. FIG.
FIG. 8 is a table showing correspondences between variable names and data memory addresses.
9 is a diagram showing the structure of a data memory 205 and a verification data memory 501 of the monitor device 2. FIG.
10 is a diagram illustrating an example of a display format on the screen of the display device 211. FIG.
FIG. 11 is a diagram showing a mechanism that can arbitrarily set input variable data used to verify the execution result by the control device;
FIG. 12 is a diagram showing a configuration of a monitor system of a conventional control device.
FIG. 13 is a flowchart of processing when a conventional control device 51 executes a control program.
[Explanation of symbols]
1,51 ... Control device
2,52 ... Monitor device
3, 53 ... Transmission path
11, 201 ... CPU
12, 202 ... Program memory
13, 203 ... Work memory
14 Sequence processor
15, 204 ... Control program memory
16, 205 ... Data memory
17,207 ... System bus
18, 208 ... communication interface
19,209 ... I / O interface
206 ... display interface
210 ... Input device
211 ... Display device
401. Sequence operation circuit
402: Internal register
403 ... Sequence instruction pointer
404 ... Sequence instruction register
405 ... Operand data register
406 ... Monitor start address register
407: Monitor end address register
408: Monitor instruction address register
409 ... Comparison circuit
410: Data accumulation control circuit
411 ... Step monitor designation flag
412 ... Accumulated data counter
413 ... Data storage memory
501 ... Data memory for verification
502 ... Setting data memory

Claims (9)

A control device monitoring system comprising a control device and a monitoring device placed under conditions more advantageous than the control device,
The controller is
It has an execution result transmitting means for transmitting a result of the control unit executes the control program on the monitor,
The monitor device is
Execution means for executing the same control program as the control program executed by the control device;
Display means for displaying the execution result transmitted by the execution result transmission means and the execution result obtained by the execution means;
A control system monitor system comprising: In the monitor system of the control device according to claim 1 ,
The control device includes collection means for collecting variable data used by the control program;
Have a, a variable transmission means for transmitting to said monitoring device in the order using the variable data collected by said collecting means,
The monitoring device execution system uses the variable data transmitted from the control device in the order of transmission when executing the control program . In the monitor system of the control device according to claim 1 or 2 ,
The favorable conditions under the monitoring system of the control device, wherein the control device is susceptible noise interface than the arrangement environment. In the monitor system of the control device according to any one of claims 1 to 3 ,
The lower favorable conditions, monitoring system of the control device towards the control device the monitoring device than is characterized in that it operates at low speed. In the monitor system of the control device according to any one of claims 1 to 4 ,
The execution result transmitting means transmits an execution result in a monitor range designated for the control program. In the monitor system of the control device according to claim 2 ,
The monitoring system for a control device, characterized in that the monitoring device has storage means for storing the variable data transmitted by the variable transmission means in association with a variable name based on an execution procedure of the control program. In the monitor system of the control device according to claim 6,
The monitor device includes a selection unit that selects variable data stored by the storage unit and variable data set separately from the variable data.
The control system monitoring system, wherein the execution means executes a control program using the variable data selected by the selection means. In the monitor system of the control device according to any one of claims 1 to 7,
The display means displays an execution result by the control device, an execution result by the monitor device, and variable data used by at least one of the control device or the monitor device in a specified order. Control system monitor system. In the monitor system of the control device according to any one of claims 1 to 8,
The control apparatus has a control unit that executes a control program for each step or for each scan.

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