JP2001255935A - Monitor system for controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an operator to easily and accurately judge the validity of a result, obtained with a control program executed by a controller. SOLUTION: A monitor device is operated under a condition, which is more advantageous than that of a controller at the time of executing a control program, and a variable A, being an executed result obtained when the controller executes the control program by using a variable B, a variable C and a variable D for input and the variable B, the variable C and the variable D from the controller are transmitted to the monitor device, and a variable A' being an executed result obtained, when the monitor device executes the same control program as that executed by the controller by using those variables and the variable B, the variable C and the variable D for input are displayed at the monitor device in an order designated by an operator. Thus, it is possible to easily judge a difference between the variable A being the executed result obtained by the controller and the variable A' which is the accurate executed result obtained by the monitor device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is widely used for controlling steel plants, papermaking plants, assembling plants such as the automobile industry, chemical plants, water and sewage systems, and other public systems, and other industrial systems. The present invention relates to a monitor system for a control device for monitoring the operation of the control device.

[0002]

2. Description of the Related Art FIG. 12 is a diagram showing a configuration of a monitor system of a conventional control device. The monitor system of the control device shown in the figure includes a control device 51 for executing a predetermined control program for controlling an industrial system or the like, and a control device 51.
Has a monitor device 52 for displaying the result of execution of the control program and the like, and a transmission line 53 connecting the control device 51 and the monitor device 52.

FIG. 13 is a flowchart of a process when the control device 51 executes a control program. As shown in the figure, the control device 51 executes input / output of 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 the scans have been completed. If all the 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 to execute the control program as a whole. The monitor device 52 displays the variable data received from the control device 51 and the same control program as that executed by the control device 51.

[0004] The variable data and the control program used in this manner are displayed. When the control device 51 is located on a production line of a plant or a place where a strong magnetic field is generated, etc. It is conceivable that the control device 51 malfunctions due to the influence and the execution result of the control program is erroneous, and when the control device 51 operates at high speed, the input / output of the variable data fails and the execution result of the control program is This is because the legitimacy of the execution result by the control device 51 can be monitored through the display screen of the monitor device 52 because it is possible to make a mistake.

[0005]

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. 5
The determination of the validity of the execution result by No. 1 was performed by the operator. Therefore, when the control program calculates a simple logic, the validity of the execution result can be determined.
When a complicated logic is operated, there is a problem that it takes a long time to analyze and it is difficult to make a determination.

The present invention has been made in view of the above, and an object of the present invention is to enable an operator to easily and accurately judge the validity of a result of executing a control program by a control device. A monitor system for a control device is provided.

[0007]

According to a first aspect of the present invention, there is provided a monitor system for a control device according to the present invention, wherein a result of execution of a control program by the control device is a predetermined value different from that of the control device. Execution result transmitting means for transmitting to the monitor device operating under the condition, execution means provided in the monitor device for executing the same control program as the control program executed by the control device, and transmission by the execution result transmitting means The gist of the present invention is to include a display unit for displaying the execution result obtained and the execution result obtained by the execution unit.

According to the present invention, in order to verify the execution result of the execution of the control program by the control device and the execution result by the control device, the monitor device which operates under more advantageous conditions than the control device executes on the control device. By displaying the execution result of executing the same control program as that executed, it is possible to compare the execution result by the control device with the accurate execution result by the monitor device, and to confirm the validity of the execution result by the control device. It is easy to judge.

According to a second aspect of the present invention, in the monitor system for the control device according to the first aspect, the predetermined condition is that the environment in which the monitor device is arranged is more than the environment in which the control device is arranged. The gist of the invention is that it is hardly affected by noise.

The present invention according to claim 3 provides the present invention according to claim 1 or 2
In the monitor system for a control device according to the present invention, the predetermined condition is that the monitor device operates at a lower speed than the control device.

According to the second and third aspects of the present invention, when the control device is disposed in an environment susceptible to noise such as a production line having a strong magnetic field or when the control device operates at high speed. If there is a risk that input / output of variable data may fail, 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, so that the monitor device can execute correctly. The result is reliably obtained, so that the validity of the execution result by the control device can be accurately determined.

The present invention according to claim 4 provides the invention according to claims 1 to 3.
In the monitor system for a control device according to any one of the above, the gist is that the execution result transmitting means transmits an execution result in a monitor range designated for the control program.

The present invention according to claim 5 provides the invention according to claims 1 to 4.
In the monitoring system for a control device according to any one of the above, the control device uses a collection unit that collects variable data used by a control program in a specified monitoring range, and uses the variable data collected by the collection unit. And a variable transmission means for transmitting to the monitor device in the order described.

According to the present invention, an enormous amount of execution results and variable data are transmitted by transmitting the execution results and variable data in the designated monitor range to the monitor device. It is limited to a certain range so that the validity of the execution result by the control device can be efficiently determined.

Further, by transmitting the variable data to the monitor device in the order of use, the monitor device uses the variable data in the order in which the variable data is received, so that the variable data is the same as the variable data actually used in the control device. The control program can be executed on the basis of the variable data of (1), and the validity of the execution result by the control device can be accurately verified.

According to a sixth aspect of the present invention, in the monitor system for the control device according to the fifth aspect, the monitor device converts the variable data transmitted by the variable transmission means based on a control program execution procedure. The gist of the present invention is to have a storage means for storing in association with a variable name.

According to the present invention, the monitor device stores the variable data transmitted from the control device in association with the variable name based on the execution procedure such as the order of appearance of the variable in the control program. In this way, the variable data used by the control device can be correctly associated with the variable data used by the monitor device, and the same operation as that performed by the control device can be performed by the monitor device. Is to be able to judge accurately.

According to a seventh aspect of the present invention, in the monitor system for the control device according to the sixth aspect, the monitor device is configured to store the variable data stored by the storage means and the variable data set separately from the variable data. And the executing means executes the control program using the variable data selected by the selecting means.

In the present invention, the variable data stored by the storage means and the variable data set arbitrarily separately from the variable data can be selected, so that an error can be verified in the execution result by the control device. In this case, by selecting the variable data set arbitrarily and using it for the operation for verifying the execution result by the control device, whether the cause of the error in the execution result is due to the input variable data, It is possible to determine whether it is due to the logic of the control program,
The validity of the execution result by the control device can be more accurately determined.

The present invention described in claim 8 is the first to seventh aspects of the present invention.
In the monitor system of the control device according to any one of, the display means, the execution result by the control device,
The gist is to display an execution result by the monitor device and variable data used by at least one of the control device and the monitor device in a specified order.

In the present invention, the result of execution by the control device, the result of execution by the monitor device, and the used variable data are displayed in a specified order, so that the operator can easily see the result. The display can be displayed so that the difference between the execution result by the control device and the execution result by the monitor device can be easily determined.

The ninth aspect of the present invention provides the first to eighth aspects.
In the monitor system for a control device according to any one of the above, the control device includes an execution unit that executes a control program for each step or each scan.

According to the present invention, since the control device executes the control program for each step or for each scan, the amount of variable data transmitted from the control device to the monitor device is enormous. In the case where the execution is delayed compared to the execution of the control program in the control device, the operation in the control device can be made to wait for an appropriate time so that the monitor device can reliably collect all the variable data from the control device. ing.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a diagram showing a configuration of a monitor system of a control device according to a first embodiment. The control device 1 shown in FIG. 1 is arranged, for example, on a production line or the like having a strong magnetic field, 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 arranged in an environment that is not easily affected by noise, such as a control room.

First, the configuration and operation of the control device 1 will be described.

The control device 1 shown in FIG. 1 includes a CPU 11 for controlling the entire operation of the control device 1, a sequence operation processor 14 for executing a control program, a control program memory 15 for storing a control program, and a control program execution. Memory 1 for storing variable data used for
6, a program memory 12 storing a program for operating the entire control device 1, a work memory 13 for working when executing the control program, and a CPU
System bus 17 for connecting 11 and other components
And a communication interface 18 connected to the transmission path 3 for communicating with the monitor device 2, and an input / output (I / O) for inputting / outputting variable data to / from a control target (not shown).
/ O) interface 19.

FIG. 2 is a diagram showing a configuration of the sequence operation processor 14. A sequence operation processor 14 shown in FIG. 3 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. An operand data register 405 for storing data to be monitored, a monitor start address register 406 for storing a monitor start address corresponding to a monitor range specified by the monitor device 2, and a monitor for storing a monitor end address. An end address register 407, a monitor instruction address register 408 for storing addresses of instructions in the monitor range, contents of address registers 406 to 408, a sequence instruction pointer 403, a sequence instruction register 404, and an operand data register 4 If a match by comparing the contents of 5 to that effect data storage control circuit 4
The comparison circuit 409 for transmitting the variable data to the CPU 10 controls the start and stop timings of storing the variable data, the variable data to be stored is determined by the type of the instruction being executed, and the entire operation of storing the variable data. In addition to the control, when necessary, the data accumulation control circuit 410 for sending an interrupt signal to the CPU 11 via the system bus 17 and the execution of the control program are interrupted each time the control program is executed for one step to synchronize with the monitor device 2 A counter 412 for counting the number of variable data stored in the data storage memory 413;
A data storage memory 413 that is used as a buffer for storing data and stores variable data in units of bit data, word data, and the like, and 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 for temporarily storing variable data required for execution of the operation. Note that the sequence operation processor 14 may be one in which the same logic is realized by software.

The sequence operation processor 14 has an I / O
After the state of the external control target is input via the interface 19, the control program is read from the control program memory 15, and the control program is executed while accessing the variable data stored in the data memory 16 as necessary. Then, the execution result is transmitted to the I / O interface 19.
Output to an external control object via When the monitor range is designated by the monitor device 2, when executing the control program, the input variable data used in the monitor range and the output variable data indicating the execution result are accumulated in time series. Then, the stored variable data is transmitted to the monitor device 2 via the communication interface 18.

FIG. 3 is a flowchart of a process when the control device 1 executes a control program.

First, in step 10, variable data is input / output to / from the control object via the I / O interface 19, and in step 11, execution of the control program is started.

In step 12, the sequence operation processor 14 sets the monitor start address sent from the CPU 11 corresponding to the monitor range specified by the monitor device 2 in the monitor start address register 406, and similarly sets the monitor end address. Is set in the monitor end address register 407.

When the control program is executed, the comparison circuit 409 compares the value of the sequence instruction pointer 403 with the value of the monitor start address register 406. When the coincidence is detected, the data accumulation control circuit 410 stores the necessary variable data thereafter in the data accumulation memory 413 and updates the value of the accumulation data counter 412.
The variable data stored here includes variable data used for input as well as output variable data indicating the execution result. When the value of the instruction pointer 403 matches the value of the monitor end address register 407 or when the value of the storage data counter 412 reaches a specified value, the data storage control circuit 410 notifies the CPU 11 to that effect.

At step 13, the CPU 11 sends monitor data to the monitor device 2 via the communication interface 18. The monitor data includes the collected input variable data and the output variable data indicating the execution result.

At 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 not, the process returns to step 10. The above processing is repeated, and when all the scans have been completed, the execution processing of the control program is completed.

As described above, the control device 1 can collect input variable data used by the control program in the monitor range in a time series according to the order of use, and transmit the collected variable data to the monitor device 2. ing.

Next, the configuration and operation of the monitor device 2 will be described.

FIG. 4 is a diagram showing a configuration of the monitor device 2. The monitor device 2 shown in FIG.
U201, a control program memory 204 for storing the same control program as the control program stored in the control device 1, and a data memory 205 for storing variable data
A program memory 202 in which a program for operating the entire monitor device 2 is stored; a work memory 203 for working when executing the control program;
A system bus 207 for connecting the PU 201 and other components, a communication interface 208 connected to the transmission path 3 for communicating with the control device 1, and an operator to specify a monitoring range or variable data Input device 210 constituted by a keyboard or the like for performing
0, a display device 211 for displaying a control program and variable data, and a display interface 206 for connecting the display device 211 to the system bus 207. It is a configuration to have.

FIG. 5 is a flowchart of a process when the monitor device 2 executes the control program. As preparation for starting this processing, the operator of the monitor device 2
The monitor range of the control program is designated using the input device 11 and the input device 210. 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.

In step 21, when the operator issues 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.

At step 22, the CPU 201 reads a control program for the monitor range from the control program memory 204.

In step 23, the process waits until monitor data is received from the control device 1. The monitor data is composed of input variable data and output variable data indicating the execution result, as described above. And
If the monitor data has been received, the process proceeds to step 24, where the monitor data is stored in the data memory 205 in association with the variable name by a method described later.

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. In step 27, the execution result data and the execution result data by the control device 1 are stored in a manner described later. It is displayed on the display device 211.

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 to repeat the above-described processing. The execution process ends.

Next, a method for causing the monitor device 2 to correspond the monitor data transmitted from the control device 1 to the variable names will be described.

FIG. 6 is a diagram showing an example of a state where the control device 1 has compiled a control program. FIG.
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 for variable A.

FIG. 9B shows an example in which the source program is compiled and converted into a sequence instruction. Here, the source program is transformed into a format corresponding to the type of the sequence instruction, and the order of the instructions is also changed to the reverse Polish format.

"LD" is a mnemonic notation of an instruction for substituting the contents of an operand into an accumulator. "MU
"L" is a mnemonic notation of an instruction for assigning the product of the operand content and the accumulator content to the accumulator, and "ADD" is a mnemonic notation of assigning the sum of the operand content and the accumulator content to the accumulator. " ST "is a mnemonic notation for substituting the contents of the accumulator for the operand. In this state, the variable is still treated as a variable name.

FIG. 9C shows an example in which the 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 within the monitor range by the control device 1 is collected in the order of the machine language.

FIG. 7 is a diagram showing the order of monitor data transmitted from the control device 1 to the monitor device 2. Monitor device 2
Then, the order of the monitor data transmitted by the control device can be known in advance based on the order of the variable names in the monitoring range of the control program held by itself, the sequence of sequence instructions, and the like.

Therefore, the monitor device 2 prepares in the work memory 203 in advance a correspondence table between the variable names and the addresses on the data memory 205 for storing the contents as shown in FIG. The received monitor data, that is, the contents of the variable B, the contents of the variable C, and the like are stored in the corresponding addresses of the data memory 205. In this way, the monitor device 2 can store the variable data transmitted by the control device 1 in association with the variable name.

Next, the execution result data by the control device 1 and the execution result data by the monitor device 2 are displayed on the display device 211.
Will be described.

FIG. 9 shows the data memory 20 of the monitor device 2.
FIG. 5 is a diagram showing a structure of a data memory 501 for verification.
The monitor device 2 includes a control device 1 as shown in FIG.
(B) while storing the variable data sent from the data memory 205 at a predetermined physical address of the data memory 205.
As shown in (1), a verification data memory 501 is created in the work memory 203 as a comparison memory.

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.

Referring to the control program used in FIG. 6 as an example, variables B, C, and D correspond to input variable data, and variable A corresponds to output variable data. That is, the verification data memory 501 stores 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. 'Is stored.

FIG. 10 is a diagram showing an example of a display format on the screen of the display device 211. The contents corresponding to each item 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, and the variable D are shown in the table. Displayed in format. In order to realize this display, the monitor device 2 is provided with the same data table as the data table of FIG. 10 in the work memory 203, and reads out and displays this data table.

The items of the data table provided in the work memory 203 can be rearranged in the order specified by the operator using the input device 210.
They are arranged in an arbitrary order and displayed on the screen of the display device 211 for easy comparison.

For example, 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 as shown in FIG. It is understood that the content of the variable A for the second execution is 40, whereas the content of the variable A 'is different from 53. Therefore, it is easy to judge that the execution result by the control device 1 is incorrect. Can be.

Therefore, according to the present embodiment, the control device 1 is placed in an environment less susceptible to noise than the control device 1 for verifying the execution result of executing the control program and the execution result. The monitoring device 2 is the control device 1
By displaying, on the display device 211, the execution result of executing the same control program as that executed in the above, it is possible to compare the execution result by the control device 1 with the accurate execution result by the monitor device 2. The control device 1
Can easily judge the validity of the execution result.

According to the present embodiment, the control device 1
However, by collecting and transmitting the execution result in the specified monitor range and the variable data used by the control program in this monitor range, an enormous amount of variable data is limited to a certain range, so that efficient The validity of the execution result by the control device 1 can be determined. Also, the control device 1
Monitoring device 2 in the order in which the variable data collected by
, The monitor device 2 can execute the control program based on the same variable data as the variable data actually used by the control device 1 by using the variable data in the order of reception. Can correctly judge the validity of the execution result.

Further, according to the present embodiment, the monitor device 2 transmits the variable data transmitted from the control device 1 to the
By storing the variables in association with the variable names based on the order of appearance of the variables in the control program, etc.
The variable data used in step (1) can be made to correctly correspond to the variable data used by the monitor device (2), and the same operation as that performed by the control device (1) can be performed on the monitor device (2). The validity of the execution result can be accurately determined.

Further, according to the present embodiment, the execution result by the control device 1 and the execution result by the monitor device 2
Since the used input variable data is displayed on the display device 211 in the specified order, the data can be displayed side by side so that the operator can easily see it. Therefore, the execution result by the control device 1 and the monitor device 2 are displayed. Can be easily determined.

In the present embodiment, when the control device 1 is placed in an environment where a malfunction may be caused by external noise, the monitor device 2 may be placed in an environment that is not easily affected by external noise such as a control room. To obtain an accurate execution result. However, as another example, when there is a possibility that input / output of variable data may fail due to high-speed operation of the control device 1, May be operated at a lower speed than the control device 1 to obtain an accurate execution result.

When the entire control device 1 is composed of only hardware, the same processing as that of the control device 1 is performed by different operations by configuring the monitor device 2 with software and hardware. To do,
A failure of the control device 1 may be found.

[Second Embodiment] The basic configuration of a monitor system for a control device according to a second embodiment of the present invention is the same as that of the first embodiment, and the features thereof are as follows. In addition, it is possible to arbitrarily set input variable data used for verifying an execution result by the control device 1 in the monitor device 2.

FIG. 11 is a diagram showing a mechanism that allows variable setting of input variable data. C of the monitor device 2
The PU 201 follows the instruction given by the operator using the input device 210, and the verification data memory 5 shown in FIG.
01, a setting data memory 502 is prepared in the work memory 203. This setting data memory 50
2 has the same structure as that of the verification data memory 501, and stores the variable data sent from the control device 1, while allowing the operator to arbitrarily change the variable data.

In step 31, the operator designates a data selection flag to select whether the data memory used for verification is the verification data memory 501 or the setting data memory 502. . In step 32, the variable data stored in the selected data memory is used for an operation for verification, and in step 33, the verification result is transmitted to the display device 211.

Therefore, according to the present embodiment, since the variable data transmitted from the control device 1 and the variable data set arbitrarily can be selected, an error occurs in the execution result of the control program. In this case, arbitrarily set variable data is selected and used for the operation for verifying 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. Since the determination can be made, the validity of the execution result can be more accurately determined.

[Third Embodiment] The basic configuration of a monitor system of a control device according to a third embodiment of the present invention is the same as that of the first embodiment, and its features are as follows. In general, since the execution speed of the control device 1 is generally high, it is difficult to collect and verify all execution results of the control program by the control device 1 with the monitor device 2, and therefore, When verifying the execution result of the program, the control device 1 is caused to execute the control program for each step or for each scan.

When the control program is executed by the control device 1 for each step, the CPU 201 of the monitor device 2 is used.
Notifies the CPU 11 of the control device 1 to that effect. The CPU 11 of the control device 1 sets the step monitor designation flag 411 inside the sequence operation processor 14 shown in FIG. This step monitor designation flag 4
When 11 is set, the sequence operation processor 14
Executes a sequence instruction one step (one instruction) at a time, and outputs an interrupt signal 41 to the CPU 11 every time one step is executed.
4 and waits for an instruction from the operator to start the next step. The CPU 11 transmits the contents of the variable data stored in the data storage memory 413 to the monitor device 2 each time the interrupt signal 414 is input. In this way, the execution result of the control device 1 can be monitored for each step.

When the control device 1 executes the control program for each scan, the CPU 2 of the monitor device 2
01 notifies the CPU 11 of the control device 1 to that effect. At this time, the CPU 11 of the control device 1 stores that the scan execution mode is set, and after the sequence operation processor 14 executes the control program for one scan, the content of the variable data stored in the data storage memory 413 is monitored by the monitor device 2. And waits for an instruction 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.

Therefore, according to the present embodiment, since the control device 1 executes the control program for each step or for each scan, the amount of variable data transmitted from the control device 1 to the monitor device 2 is reduced. When the transmission time is enormous and the transmission time is slower than the execution time of the control program in the control device 1, the calculation in the control device 1 can be made to wait for an appropriate time. All variable data from can be reliably collected.

In the present embodiment, only the control device 1 executes the control program for each step or scan, but the monitor device 2 also executes the control program for each step or scan. It may be.

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 for each scan, and to compare the execution results of the two in real time.

[0075]

As described above, according to the present invention, it is possible to compare the execution result of the control device with the accurate execution result of the monitor device. The legitimacy of the execution result can be easily determined.

According to the second and third aspects of the present invention, the monitor device can be placed in an environment that is not easily affected by noise, such as a control room, or the monitor device can be operated at a low speed, so that the monitor device can accurately operate. Since the execution result is reliably obtained, the validity of the execution result by the control device can be accurately determined.

According to the present invention, an enormous amount of execution results and variable data are limited to a certain range, so that the validity of the execution results by the control device can be efficiently determined. Can be.

According to the present invention, the variable data used by the control device can be made to correspond to the variable data used by the monitor device correctly, and the same operation as that executed by the control device can be performed by the monitor device. However, it is possible to accurately determine the validity of the execution result by the control device.

According to the present invention, whether the cause of the error in the execution result is due to the input variable data,
Since it is possible to determine whether the result is based on the logic of the control program, it is possible to more accurately determine the validity of the execution result of the control device.

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 see it. And the difference between the result of execution by the monitor device can be easily determined.

According to the ninth aspect of the present invention, it is possible to make the operation in the control device wait for an appropriate time, so that the monitor device reliably collects all the variable data from the control device. Can be.

[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 showing a configuration of a sequence operation processor 14.

FIG. 3 is a flowchart of a process when the control device 1 executes a control program.

FIG. 4 is a diagram showing a configuration of a monitor device 2.

FIG. 5 is a flowchart of a process when the monitor device 2 executes a control program.

FIG. 6 is a diagram showing an example of a state in which the control device 1 has compiled a control program.

FIG. 7 is a diagram showing the order of monitor data transmitted from the control device 1 to the monitor device 2.

FIG. 8 is a table showing the correspondence between variable names and data memory addresses.

FIG. 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 showing an example of a display format on a screen of a display device 211.

FIG. 11 is a diagram illustrating a mechanism that can arbitrarily set input variable data used for verifying an execution result by a 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 a process when a conventional control device 51 executes a control program.

[Explanation of symbols]

 1, 51: Control device 2, 52: Monitor device 3, 53: Transmission line 11, 201: CPU 12, 202: Program memory 13, 203: Work memory 14: Sequence operation 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 calculation 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 storage control 411 ... Step monitor designation flag 412 ... storing data counter 413 ... data storage memory 501 ... verification data memory 502 ... setting data memory

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (9)

[Claims] An execution result transmitting unit configured to transmit a result of execution of a control program by a control device to a monitor device operating under predetermined conditions different from that of the control device; An execution unit that executes the same control program as the executed control program; and a display unit that displays the execution result transmitted by the execution result transmission unit and the execution result obtained by the execution unit. A monitor system for a control device, characterized by: 2. The monitor system for a control device according to claim 1, wherein the predetermined condition is that the environment where the monitor device is arranged is less affected by noise than the environment where the control device is arranged. A monitor system for a control device, characterized in that: 3. The monitor system for a control device according to claim 1, wherein the predetermined condition is that the monitor device operates at a lower speed than the control device. . 4. The monitor system for a control device according to claim 1, wherein said execution result transmitting unit transmits an execution result in a monitor range specified for the control program. Equipment monitoring system. 5. The monitor system for a control device according to claim 1, wherein the control device collects variable data used by the control program in a designated monitor range, and the collection device collects variable data. Variable transmission means for transmitting the variable data collected by the means to the monitor device in the order in which they are used. 6. The monitoring system for a control device according to claim 5, wherein the monitoring device stores the variable data transmitted by the variable transmission unit in association with a variable name based on a control program execution procedure. A monitor system for a control device, comprising a storage unit. 7. The monitor system for a control device according to claim 6, wherein the monitor device has a selection unit that selects the variable data stored by the storage unit and the variable data set separately from the variable data. The execution unit executes the control program using the variable data selected by the selection unit. 8. The monitor system for a control device according to claim 1, wherein said display means includes an execution result by said control device, an execution result by said monitor device, and said control device or said monitor. A monitor system for a control device, wherein variable data used by at least one of the devices is displayed in a specified order. 9. The monitoring system for a control device according to claim 1, wherein the control device has an execution unit that executes a control program for each step or for each scan. Monitor system.