JP3388118B2 - Simulation equipment for plant control programs - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulation device suitable for verifying a plant control program including a timer process.

[0002]

2. Description of the Related Art A plant control device controls a plant according to a plant control program. The process of the plant control program includes many timer processes that wait for a certain period of time. To implement this timer processing,
The plant control device is provided with a plurality of timers for measuring the set time length. Here, the time length (duration) measured by each timer is from 1 second to 1
It takes a wide range of values, even over time.

The plant control program needs to verify the execution procedure by simulation before being applied to an actual plant. A simulation device having a function of realizing a plurality of timers by software processing is used for this simulation. Since the duration of the timer takes a wide range of values, the simulation apparatus needs a function of adjusting the duration of the timer in order to efficiently verify the operation procedure of the program.

The conventional simulation apparatus includes a device having a function of setting an arbitrary waiting time designated by a user's key operation for each timer used by a plant control program to perform measurement, and a user having a function. There is a device having a function of changing the duration time of the timer by changing the progressing speed of the simulation in accordance with the instruction.

As a publicly known example of a simulation device having a function of changing the progress speed of the simulation in accordance with a user's instruction, there is JP-A-3-292504. In the simulation device described there, the standby time specified by the plant control program is set as it is in each timer, and the progress speed of the simulation (that is,
The speed of the software processing of the timer is changed by changing the CPU execution speed). As a result, the durations of all timers change at the same rate according to the progress speed of the simulation. For example, when verifying the processing procedure of the processing including the timer processing with a long waiting time such as several tens of minutes, the user can confirm the processing flow in a short time by increasing the progress speed of the simulation. it can. Further, the adjustment of the progress speed of the simulation can be changed by the user at any time by key operation.

[0006]

In the above-mentioned conventional simulation apparatus having the function of setting the duration specified by the user in the timer, the user continues key operation for all the timers used in the plant control program. You have to set the time. For this reason, when the plant control program controls a large-scale plant, the number of timers used becomes large, and a great deal of labor is required to set the duration.

On the other hand, in the above-mentioned conventional simulation device having a function of changing the progress speed of the simulation according to the user's instruction, the measurement time of all timers increases or decreases at the same rate. Therefore, when a timer with a long duration and a timer with a short duration coexist, that is, when the duration set in each timer is distributed over a wide time range, for example, in a simulation Even if the waiting time by the long duration timer can be shortened by increasing the progressing speed, the processing of the short duration timer is instantaneously ended, and it is difficult to confirm the processing. Also, in order to solve this problem by using the function to adjust the progress speed of the simulation, it is necessary to grasp the starting sequence and duration of each timer and adjust the progress speed by key operation at the appropriate time. Is a heavy burden.

[0008] Therefore, it is an object of the present invention to allow a user to more easily verify the operation of a plant control program including many timer instructions requesting a waiting time distributed over a wide time range. .

[0009]

According to one aspect of the present invention.
For example, a simulation device for simulating a plant control program having a plurality of timer instructions requesting waiting for processing for a specified waiting time ,
In the plant control program, each timer instruction was
Therefore, of the waiting time required by each timer instruction.
Control calculation execution means that stops until measurement is completed
If the waiting time of the command is shorter than the specified length of time,
According to the stored arithmetic function, the waiting time
Converted to a time longer than the wait time and waits for the timer instruction
Is longer than the specified length of time, the waiting time
And a conversion means for converting to a time shorter than the waiting time,
For each of the timer instructions,
The required waiting time is converted by the conversion means.
The obtained time is set by the timer
When the timer continues, the timer table saved in
Set as the interval, and continue as set in the timer table.
When the time measurement is completed, the control calculation execution unit will be notified.
Anda timer processing means for notifying said control arithmetic real
Line means, the simulation device comprising that you outputting information indicating the processing state is provided.

[0010]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.
It is a figure which shows the structure of the simulation system of a plant control program. In the simulation system of FIG. 1, the simulation device 61 processes the plant control program created by the programming construction device 51. In this process, the simulation device 61 uses the arithmetic function provided by the arithmetic function setting device 53 to perform the timer process, and at the same time, exchanges data with the plant data simulation device 21. And
Information indicating the processing state is provided to the plant monitoring device 52 and the like.

The simulation device 61 includes a program storage unit 12 for storing a plant control program and the like,
A control calculation execution unit 11 that performs a process according to the control program, a timer processing unit 15 that performs a timer process among the processes, a clock 16 used for the timer process, a timer table 17, a function calculation device 31, It is composed of an output unit 19 and plant data input / output units 13 and 14.

The program storage unit 12 includes an input / output unit 19
A control program and parameters are loaded from the program construction device 51 via the. The control calculation execution unit 11 performs processing according to the control program and parameters of the program storage unit 12, and outputs information indicating the processing state via the input / output unit 19 to the program construction device 51 and the plant monitoring device 5.
Provide to 2. Further, the control calculation execution unit 11 starts, stops, and restarts the process according to the instruction sent from the plant monitoring device 52. The input / output unit 19 provides the same connection and communication as the input / output unit of the plant control device of the actual plant with respect to the data communication to the program construction device 51 and the plant monitoring device 52. Similarly, the plant data input / output unit 1
3 and 14 also provide the same connection and communication as the plant data input / output unit of the plant control device connected to the actual plant.
The program construction device 51 and the plant monitoring device 52
It is also possible to incorporate the above function into the simulation device 61.

Plant data simulation device 2
1 is for simulating the response of the plant, and transfers the instruction value and the response value to and from the plant data input / output units 13 and 14 of the simulation apparatus 61.
Upon receiving the instruction value from the simulation apparatus 61, the plant data simulation apparatus 21 returns a response value corresponding to the instruction value after a certain time, or returns a response value obtained by multiplying the instruction value by a constant. . Furthermore, it is also possible to return a response value designated by the user, or fixedly return a preset constant value. The function of the plant data simulation device 21 can be incorporated in the simulation device 61.

Details of the simulation device 61 are shown in FIG.
Will be explained.

In FIG. 2, the control operation execution unit 11 has a function of processing a control program for each task, and a timer processing interpretation routine 111 for managing the processing of a timer instruction included in the task.

The timer table 17 stores information about timers in a row for each timer. This timer table 17 has an ID for identifying each timer.
Column 171 for recording, a column 172 for recording the time duration of the timer requested by the control program for simulation, a column 173 for recording the elapsed time since the timer was started, and a column 173 for the timer. Column 174 for recording information on the task requesting activation of the command and its command position. In this example, "0" is set to the setting duration of the timer not in use, so that the information on the timer in use and the information on the timer not in use are distinguished. Information indicating whether or not each timer is in use may be separately recorded in the timer table 17.

The timer processing unit 15 performs a startup processing unit 151 for performing a timer startup process, an update processing unit 152 for updating the timer table 17 at regular time intervals, and an end process for a timer whose duration has elapsed. And a termination processing unit 153 for performing. In response to a request from the timer processing interpretation routine 111, the startup processing unit 151 selects a timer that is not in use in the timer table 17 and sets the requested duration time in the setting duration 172 of the selected timer row. . In the update processing of the update processing unit 152, the elapsed time 173 of the row of the timer being used is increased in accordance with the update of the time of the clock 16, and the set duration time and the elapsed time are compared to find a matching timer. To detect. In the end processing of the end processing unit 153, it is determined that the processing of the timer whose set duration and the elapsed time match has ended, and the timer processing interpretation routine 111 is notified.

The function calculation device 31 stores a calculation function,
Using the arithmetic function, the duration of the timer requested by the timer instruction is converted into the duration for simulation. By this conversion, the duration of each timer becomes the time that allows the user to efficiently and easily check the operation procedure of the control program. 3 and 4 show examples of arithmetic functions used by the function arithmetic unit 31. Both the arithmetic functions of FIGS. 3 and 4 have logarithmic characteristics. In the arithmetic function of FIG. 3, the duration time of ten and several seconds or less is extended, and conversely, the duration time of ten and more seconds is shortened. As a result, even when the duration required by the timer instruction has a spread of, for example, 10 minutes and 10 hours, the timer measures the time for which the operation confirmation of 20 seconds and 55 seconds can be efficiently and easily confirmed. On the other hand, in the arithmetic function of FIG. 7, the function characteristics are switched depending on the range of the input value X. For a short duration of 10 seconds or less, the conversion is rounded up to 10 seconds,
The duration time in the range of 10 to 30 seconds, which can be confirmed even when the control program is operated for the duration time, is used as it is. By using the arithmetic function of FIG. 7, a simulation closer to the control operation of an actual plant becomes possible.

The calculation function used by the function calculation device 31 is
It can be set by the user on the arithmetic function setting device 53. In the arithmetic function setting device 53, the user inputs a program representing the functional expression f (X), or inputs a table defining the output value f (X) for each section of the input value X, or the function. An arbitrary calculation function can be set by a method of inputting the characteristic f (X) in a graphic format. The function of the arithmetic function setting device 53 is built in the program construction device 51 or the plant monitoring device 52,
The function calculation device 31 may be set through the input / output unit 19.

Next, the processes of the control calculation executing section 11 and the timer processing section 15 will be described more specifically.

When the command to be executed in the task is a timer instruction for instructing standby for a certain period of time, the control operation executing unit 11 stops the processing of the task including the command, and shifts the processing to the timer processing interpretation routine. . In the timer processing interpretation routine, the timer start processing unit 151 of the timer processing unit 15 is requested to start by designating the duration requested by the timer processing command and the identification information of the request source program and command position. Here, as shown in FIG. 2, the third step of task 1 (identification information T1.S3)
It is assumed that the command of the timer processing for instructing the standby for X seconds has been executed.

FIG. 3 shows a processing flow of the activation processing section 151. The activation processing unit 151 requested to be activated by the timer processing interpretation routine first receives the information designated by the request (S11). Then, the timer table 17 is searched to select an unused timer (S12). Here, it is assumed that the timer whose ID is TMj in the table is not in use and that timer is selected. Next, the activation processing unit 151 writes the duration X seconds in the item of the set duration 172 and the timer in the item of the calling source 174 in the row of the unused TMj timer in the timer table 17. Identification information of requested task and command position "T
1. "S3" is written (S13). Then, the activation processing unit 151 designates the requested duration X of the timer,
The function arithmetic unit 31 is requested to have a duration for simulation. In response to this request, the function calculation device 31 calculates the actual duration f (X) of the timer at the time of simulation according to the stored conversion rule, and the activation processing unit 151.
Return to. The activation processing unit 151 receives the returned duration f (X) (S14) and calculates X−f (X). Then, this calculation result is written in the item of the elapsed time 173 of the timer of the selected TMj (S15), and the timer starting process is ended.

The timer update processing unit 152 refers to the clock 16 that provides the current time, updates the elapsed time of the timer table 17 every time the time is updated by 1 second, and detects the timer having the elapsed time. Specifically, the set value of the elapsed time is incremented by 1 second with the update of the current time in all the timer rows in use, and the set value of the elapsed time and the set value of the set duration are set for each row. To compare. Then, when there is a timer whose elapsed time is equal to or longer than the duration, the end processing unit 153 is notified of the ID of the timer.
In the example of FIG. 2, since the set duration time of the TMn timer and the elapsed time match, the ID of the timer whose timer processing has ended
As a result, TMn is notified to the termination processing unit 153. Also,
The processing of the TMk timer starts from f when the timer is activated.
After (X) [seconds] has elapsed, the term of the set duration 172 matches the term of the elapsed time 173, and it is determined that the processing has ended.

The timer ID (TM
n) is received from the update processing unit 152, the end processing unit 15
In 3, the timer table 17 is searched for a line in which TMn is set, and the control program and command position information “T2.S2” that requested the timer processing are acquired from the item of the calling source 174 of the searched line. Then, the acquired information is designated and an end notification is sent to the timer processing interpretation routine 111, and the setting in the timer table 17 regarding the timer for which the timer processing has ended is changed to a state indicating unused. In this example, the term of the setting duration 172 of the row of TMn is rewritten to "0". Then, the timer processing interpretation routine 111 that has received the end notification restarts the processing of the task stopped at the specified command position.

In addition, in the above-mentioned start-up processing section 151,
In S13, "0" is written in the item of elapsed time 173, and S1
Even if the duration f (X) for simulation is written in the item of the setting duration 172 in 5, the same operation can be obtained. In addition, the simulation apparatus performs exactly the same operation as the plant control apparatus when the item of the elapsed time 173 is set to “0” to end the start-up processing after the processing of S13 (S15 ′).

FIG. 5 shows an example of a control program to be simulated.

The control program shown in FIG. 5 controls the introduction of the two raw materials A and B into the reaction soda C in the plant, the reaction is carried out for a certain period of time, and the reaction product is sent to the next step. Through S43. If this control program is executed according to the set duration of the timer, a long waiting time as in S29 occurs, and it takes a wasteful time to check the operation of the control program or the monitoring screen. On the other hand, in the case of a short waiting time such as 3 seconds in S23, it becomes difficult for a human to visually confirm the processing state. The conventional method of adjusting the waiting time by adjusting the execution speed of the control program cannot solve the above two problems at the same time. That is, in the example of FIG. 5, if the execution speed is increased in order to reduce the waiting time of S29, the waiting time of S33 immediately after becomes extremely short, and it becomes difficult to visually confirm the operation.

In the present simulation apparatus, since the duration of the timer is changed to the non-linear type as described above, when a plurality of tasks are operating in parallel, the timers existing in different tasks are in the control program. It may start and end in an order different from the original order set in. In the example of FIG. 5, S22 to S24 and S41 to S43 are parallel operations. A control program for synchronizing such parallel operation tasks by using a time by a timer does not operate normally in this simulation device. However, the normal sequence control program has a structure in which it is synchronized by a method such as input conditions from the plant or inter-task notification by internal variables, as in S25 and S26. There is no problem. Also, from S28 to S
In the case of the structure in which the timer executes another routine as in 30, the called routine is not given the original execution time. However, such a routine that is executed by the timer for a certain period of time is a lower-level routine that is usually unrelated to the sequence control procedure that is the confirmation target, and does not hinder the confirmation of the procedure. When confirming the timer operation inside these calling routines, only this routine is executed individually for confirmation.

As described above, in the simulation apparatus 61 of this embodiment, the control including the timer instruction is performed by converting the duration of each timer into the duration suitable for the simulation by using the arithmetic function. The operation sequence of the program can be visually verified by the user, and the simulation can be performed without requiring an unnecessary waiting time. At this time, the user does not need to perform any operation related to the timer. Furthermore, the simulation device 61 has an effect that it can be realized with a simple configuration.

Next, a second embodiment of the present invention will be described.

In the simulation apparatus according to the second embodiment, the duration of the timer during simulation is changed by changing the update amount of elapsed time. The simulation apparatus of this embodiment is different from the simulation apparatus except that the configuration of the timer table 17 and the processing of the timer processing unit 15 are slightly different.
Simulation device of the first embodiment (FIGS. 1 and 2)
It has the same configuration and processing contents as.

The simulation apparatus of this embodiment will be described with reference to FIG. As shown in FIG. 6, in the timer table 17 of the simulation apparatus according to the present embodiment, a column 175 that stores the accounting ratio (update amount of elapsed time) of the timer.
Is newly provided.

The activation processing unit 151 of the timer processing unit 15 is
At the time of starting the timer, the duration X and the elapsed time “0” requested by the control program are set in the set duration 172 and the elapsed time 173 of the timer table 17, respectively. Then, the ratio X / f (X) of the requested duration time X and the simulation duration time f (X) obtained from the function calculation device is stored in the item of the accounting ratio 175.

The timer update processing unit 152 determines the elapsed time 17
Every time the time [seconds] of the clock 16 is updated, the set value of the item of item 3 is added with the set value of the item of accounting ratio 175 instead of adding 1. As a result, when f (X) [seconds] has elapsed in real time, the set value of the term of elapsed time 173 becomes X, and it is determined that the timer processing has ended.

The duration and elapsed time of each timer are provided and displayed on the plant monitoring device. Since the elapsed time changes from "0" to the duration X required by the control program by a fixed amount, the user can know the approximate elapsed time of the timer in the control of the actual plan.

Instead of storing the accounting ratio X / f (X) in the timer table 17, the simulation duration f (X) obtained from the function computing device is stored.
When updating the elapsed time, the timer update processing unit 152 may calculate X / f (X) from the set value in the timer table and add it to the elapsed time.

As described above, in the simulation apparatus of this embodiment, in addition to the effects obtained in the first embodiment,
The elapsed time in the timer table 17 of the operating timer is
It can be confirmed as the elapsed time of the timer when controlling the actual plant.

In the first and second embodiments, the control program requesting the timer processing and the command position information are recorded in the timer table 174. However, this is recorded in the timer processing interpretation routine 111. You may. In this case, the timer processing unit 15 notifies the timer processing interpretation routine 111 of an identifier for distinguishing the requested timer processing from other timer processing at the time of start-up processing, and attaches the same identifier at the time of termination to notify the termination. To do.

Although the accuracy of the timer has been described as 1 second, the simulator of the control program executed by the controller equipped with the timer of higher accuracy requires the timer function of the accuracy corresponding to this. . Specifically, the activation cycle of the update processing unit is executed at the same cycle as the required timer accuracy.

Next, a third embodiment of the present invention will be described.

As described above, the simulation apparatus of the first embodiment performs the same operation as the plant control apparatus when the elapsed time [seconds] in the timer table is sequentially increased from "0" by 1 second. . By utilizing this, in the device of the third embodiment, the function of the simulation device and the function of the plant control device can be selectively used.

FIG. 8 shows the configuration of an actual plant control and plant control program simulation device according to the third embodiment. As shown in FIG. 8, in the present apparatus, a timer processing 15 includes a start processing section 1511 for plant control and a start processing section 15 for simulation as start processing sections.
12 is provided, and mode changeover switches 41 and 42 for activating one of the activation processing units are provided. Further, the plant data simulation device 21 is incorporated, and changeover switches 43 and 44 for selecting a connection target of the plant data input / output units 13 and 14 are provided. The other configuration is the same as that of the simulation apparatus according to the first embodiment.

When the mode changeover switches 41 and 42 are set to the "a" side, the timer start processing unit for controlling the actual plant is in the operating state, and the initial value set in the item of elapsed time 173 of the timer table is "0". Becomes When the mode changeover switches 41 and 42 are switched to the b side, the timer activation processing unit for simulation is in the operating state, and the initial value set in the term of elapsed time 173 of the timer table is the simulation obtained from the function arithmetic unit 31. The value becomes X-f (X) based on the duration of the hour timer. These switches switch states according to instructions sent from the program construction device 51 or the plant monitoring device 52 via the input / output unit 19.

The changeover switches 43 and 44 also change the state in cooperation with the mode changeover switches 41 and 42 according to the above instruction. Changeover switch 4 when controlling the actual plant
3, 44 are set on the b side, and the actual plant is connected to the plant data input / output units 13 and 14. During the simulation, the changeover switches 43 and 44 are set to the b side, and the plant data input / output units 13 and 14 are connected to the plant data simulation device 21.

According to the device 62 of the present embodiment, the user is allowed to use the program construction device 51 or the plant monitoring device 5
The simulation of the plant control program and the control of the actual plant can be selectively executed only by instructing the switching of the mode on the control unit 2.

It should be noted that the plant data simulation device 21 may not be built in the present device 62 but may be installed outside, and the connection switching between the actual plant and the simulation device may be performed outside. Further, the device 62 only adds the function of converting the duration of the timer from the value set by the control program to the value used in the simulation according to the relationship given by the user to the control device of the actual plant. And can be easily configured.

[0049]

According to the present invention, the user can more easily carry out the verification of the operation of the plant control program including many timer instructions requesting the waiting time distributed over a wide time range. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of a simulation device according to an embodiment of the present invention.

FIG. 2 shows a detailed configuration of a simulation device 61.

FIG. 3 is an example of an arithmetic function (logarithmic function) used for conversion of a timer duration.

FIG. 4 is an example of an arithmetic function in which a different function is set for each input value section.

FIG. 5 is an operation flow of a timer starting unit.

FIG. 6 is an example of a plant control program executed by a control calculation execution unit.

FIG. 7 is an explanatory diagram of an operation of a timer processing unit of the simulation device according to the second embodiment.

FIG. 8 is a configuration diagram of an apparatus that combines a control function and a simulation function of an actual plant according to a third embodiment.

[Explanation of symbols]

15 Timer Processing Unit 17 Timer Table 21 Plant Data / Simulation Device 31 Function Calculation Device 51 Program Construction Device 52 Plant Monitoring Device 53 Calculation Function Setting Device 61 Plant Control Program Simulation Device 62 Real Plant Control and Plant Control Program Simulation Device

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Claims (7)

(57) [Claims] 1. A simulation apparatus for simulating a plant control program having a plurality of timer instructions for requesting waiting for processing for a designated waiting time , wherein the running plant control program is executed by each of the timer instructions.
According to the waiting time required by each timer instruction
Control execution means that stops until the measurement of the time
And when the waiting time of the timer instruction is shorter than the specified time length,
Is the waiting time according to the stored arithmetic function,
Converted to a time longer than the wait time and waits for a timer command
When the time is longer than the predetermined time length, the calculation
According to a function, a conversion unit that converts the waiting time into a time shorter than the waiting time, and the timer instruction for each timer instruction,
The required waiting time is converted by the conversion means.
The obtained time is the duration of multiple timers for each timer.
The timer table stored in
When set as, and the continuation set in the timer table
When the measurement of the interval is completed, a message to that effect is given to the control calculation executing means.
Anda timer processing means for notifying said control operation execution means, the simulation device, characterized in that output the information representing the processing state. 2. A request for waiting for processing for a specified waiting time
Of a plant control program with a timer instruction
At least one timer for measuring a set length of time
Means and an arithmetic function are stored, and according to the arithmetic function, a predetermined
The waiting time of the timer instruction shorter than the time length is
Converted to a time longer than the machine time, longer than the specified time length
The waiting time is converted into a time shorter than the waiting time.
Converting means, executing the plant control program, the timer instruction
The conversion means converts the timer instruction when executing
The waiting time is set in the timer means and the timer
The above-mentioned timer
And execution means for measurement in stage is stopped until Ryosuru end, audit representing the processing state of said execution means or said timer means
Visual has an information generation unit for generating and outputting information, a calculation function that the conversion means is stored, a simulation apparatus which is a logarithmic function. 3. Requesting waiting for processing for a specified waiting time
Of a plant control program with a timer instruction
At least one timer for measuring a set length of time
Means and an arithmetic function are stored, and according to the arithmetic function, a predetermined
The waiting time of the timer instruction shorter than the time length is
Converted to a time longer than the machine time, longer than the specified time length
The waiting time is converted into a time shorter than the waiting time.
Converting means, executing the plant control program, the timer instruction
The conversion means converts the timer instruction when executing
The waiting time is set in the timer means and the timer
The above-mentioned timer
Execution means that stops until the measurement in each stage is completed, and a monitoring unit that indicates the processing state of the execution means or the timer means.
And an information generating unit that generates and outputs visual information , wherein the converting unit individually divides the time axis of the standby time of the timer command into a plurality of time regions as the arithmetic function. Memorizes the set multiple arithmetic functions,
The simulation apparatus, wherein the waiting time is converted according to an arithmetic function corresponding to the waiting time of the timer instruction among the plurality of arithmetic functions. 4. The simulation device according to claim 1, wherein a ratio X / f (X) of a waiting time X of the timer instruction and a conversion result f (X) of the waiting time by the conversion means is calculated. The timer processing means accumulates the ratio X / f (X) every time a unit time of the real time elapses, and ends the measurement when the accumulated result matches X. Simulation device characterized by. 5. Requesting waiting for processing for a specified waiting time
Of a plant control program with a timer instruction
At least one timer for measuring a set length of time
Means and an arithmetic function are stored, and according to the arithmetic function, a predetermined
The waiting time of the timer instruction shorter than the time length is
Converted to a time longer than the machine time, longer than the specified time length
The waiting time is converted into a time shorter than the waiting time.
Converting means, executing the plant control program, the timer instruction
The conversion means converts the timer instruction when executing
The waiting time is set in the timer means and the timer
The above-mentioned timer
Execution means that stops until the measurement in each stage is completed, and a monitoring unit that indicates the processing state of the execution means or the timer means.
Information generating means for generating and outputting visual information , wherein the executing means controls the actual plant in a mode in which the timer means measures the standby time of the timer command. Simulation device. 6. The simulation apparatus according to claim 1, further comprising means for generating the arithmetic function based on information input from the outside. 7. A simulation apparatus is caused to execute a simulation of a plant control program having a plurality of timer instructions for requesting waiting for processing for a specified waiting time.
Information indicating the processing state is output from the simulation device.
A simulation method that forces each of the plurality of timer instructions to be executed.
In accordance with the timer instruction,
The first process that stops the processing of the program and the waiting time of the timer instruction that is the execution target is a predetermined time
If the length is shorter than the length,
Convert the waiting time to a time longer than the waiting time,
When the waiting time of the timer instruction targeted for execution is at the predetermined time
If the waiting time is longer than the waiting time,
The second process that converts to a shorter time than the interval, and the time duration of multiple timers is saved for each timer.
Start the time obtained in the second process on the table.
The third process for setting the duration of the timer and the measurement of the duration set in the timer table are completed.
Then, the previous time corresponding to the timer whose duration has expired
Resuming the process while the plant control program is stopped
A simulation method characterized by causing the simulation device to execute four processes .