JPS62276664A - System simulation device - Google Patents

Abstract

PURPOSE:To easily attain simulation by converting the whole functions of a system into a function flow diagram combining respective codes expressing respective function element signals and driving the function flow diagram in accordance with the functions of respective codes. CONSTITUTION:A CPU 1 has a diagram converting means 101, a simulation executing means 1-2 and a system evaluating means 1-3, and a keyboard 2, a program storing means 3, a Petri net code storing means 4, a printer 5, and a CRT display device 6 are connected to the CPU 1. Respective function element signals in the system are inputted through the keyboard 2 and sent to the means 1-1 and plural codes indicating the respective function element signals are combined by the means 1-1 in accordance with respective function element signals to convert the whole functions of the system into the function flow diagram. The function flow diagram is driven by the means 1-2 in accordance with the function element signals indicated by respective codes to execute simulation.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Purpose of the Invention (Industrial Application Field) The present invention simulates a production system, etc. consisting of automatic and manual mechanical systems and conveyance systems. The present invention relates to a system simulation device suitable for.

(Conventional technology) The alignment in the production system is the process of processing workpieces.
After the workpiece enters this process, it undergoes a prescribed processing process, and is then sent to the next process as a workpiece, but when designing such a process, it is necessary to simulate this process. Knowing the number of machining processes and operating conditions over time allows evaluation by determining which parts of the machining process are insufficient. By the way, conventionally, simulations for production systems etc. have been performed using GPSS (General) etc.
79th simulation system) t-1iJJI
and went on. However, in order to use GPSS, one must first learn the language and how to operate the machine.

However, this language is very difficult, and the machine operation is also difficult, so it takes about a month to build a simulator without any problems. Therefore, although an operator who is familiar with GPSS operations can immediately perform a simulation, the reality is that even if an operator who is unfamiliar with GPSS operations attempts to perform a simulation, it is not possible to do so immediately.On the other hand, system design With 1c, there is a demand to know the simulation results immediately, and the reality is that system design does not proceed as planned.

(Problems to be Solved by the Invention) As described above, in simulations of conventional systems, only an operator who is familiar with GPSS operations can perform the simulation, and even a first-time operator can quickly and easily shimmy the system. requested.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a system simulation device that allows even a first-time operator to quickly and easily perform a simulation.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides input of each functional element signal in the system and sending it to a flowchart conversion means, and the flowchart conversion means converts each functional element signal according to each functional element signal. The overall functions of the system are converted into a function flow diagram by combining the multiple codes that represent them, and this function flow diagram is further simulated/! This system simulation apparatus is configured to perform simulation by operating according to the functional element signals indicated by each symbol by means of a control means.

(Function) By providing such a means, the overall function of the system is converted into a function flowchart that combines each code that affects each functional element signal, and this function flowchart operates according to the function of each code. A simulation is performed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a system simulation device, and FIG. 2 is a functional block diagram thereof.

This device has CPU (central processing unit) 1 and key date 2.
, program storage means 3, Petri net code storage means 4
, printer 5 and CRT display device (cathode ray tube display #
) 6 are connected.

The program storage means 3 stores a program according to the system simulation flowchart shown in FIG. 3, and is composed of, for example, a floppy disk and a reading device therefor. Furthermore, the Petri net code storage means 4 stores codes (hereinafter referred to as "codes") of basic elements of the Petri net for solving various functions such as processing equipment in the production system, such as operating conditions and events such as processing time, failure rate, and failure stop time. ,
It stores information such as Petri net codes (commonly referred to as Petri net codes). Specifically, as shown in FIG. 4, Petri net codes such as source, place, sink, transistor, and n are stored. Here, the source is, for example, the occurrence of a token (stone) or rlJ rOJ that the workpiece has been transported.
The place has the function shown as
Each sink has a function of extinguishing the token.

Therefore, each function can be expressed by combining these Petri net codes. For example, when two places are connected to one place through one transition as shown in FIG. 5, it has the same function as andf-). Tsumashi, as shown in Figure 5 (,) 2
When the conditions in one place are satisfied and the token "." is entered in both places, the token moves as shown in FIG. 5(b) by the operation of the transition.

Now, the CPU 1 has the functions shown in the functional blocks of FIG. 2 in accordance with the system flowchart shown in FIG. 3. 9. The flowchart converting means 1-1 converts the entire function of the production system into a functional flowchart as shown in FIG. A simulator that has the ability to

The system execution means No. 2 has a function of activating a function flowchart according to the function element signal indicated by the Petri net code to execute a simulation of the production system, and furthermore, the system evaluation means No. 1-3 can be obtained by simulation. It has the function of evaluating the system, for example, determining the number of processes and operation rate over time.

Next, using the apparatus configured as described above, stains, rays, and marks on the processing machine system shown in FIG. 6 will be explained.

The processing machine system shown in Figure 6 is based on the Japanese Industrial Standards (
JIi9 Z 8206). Now, if a functional flowchart of this processing machine system is created, it will be as shown in FIG. Source TI, 7” lace P
1. The machining line is represented by transition T2, place P2, transition T3, and total machining number column m. In this processing machine system, the workpiece arrives at 20'±2', so the source T1 generates tokens at 20'±2'. In addition, a source T4 is connected to TjK via a place P3, and in this source 4 generates a token every time according to the normal distribution of the source 20', which is the same time as every processing process 20'. b6 Also, a place d is connected between transitions T2 and T3, which has a function of delaying token input based on processing time. Further, place P4 is connected so as to feed back from transition T3 to T2. On the other hand, transitions T2 and T5 and a place P5 where the token can be moved are provided,
Connected to the transition T5 is a place P6 that receives tokens from a source T6 that generates tokens every time corresponding to a failure rate of 1/1000. and,
A place d2 having a function of delaying token input by a time corresponding to the failure stop time 60' is connected to this transition T5. And this place d
2 is fed back to place P5 via transition T7. Note that place P5 is connected to the input of transition T3, and the outputs of transition T2 and T3 are connected to place P5. Note that the functional flowchart of the processing machine system may be represented by simplifying two parts as shown in FIG.

Therefore, in step 11 the key? - When the functional element signals of the processing machine system are manually entered from the keypad 2, such as machining time and failure rate, each functional element signal is recorded in the memory in the CPU 1, and in step s3) IJ net code storage means 4. The function flowchart shown in FIG. 7 is read out from the function flowchart shown in FIG. This functional flowchart is then displayed on the display screen of the CRT display device 6 in response to the addition of each functional element signal. The functional flowchart of the processing machine system shown in FIG. 6 is created by combining each Petri Net code while displaying it on the CPT display device 6 by manually inputting each Petri Net code instruction from key 1 to 2. The data of the subsequent functional flowchart may be stored in the () IJ net code storage means 4. When the function flowchart is displayed in this way, the next Stella 76s5K is moved to execute the simulation according to the simulation flowchart shown in FIG. In step c1, in what state the processing machine system is started to operate, the initial conditions are determined, and specifically, in the next step e2, places Pi, P3, P4, P5 are set.
Insert the token "・" into . Finally, the CRT display device 6 shows a functional flowchart as shown in the gioi diagram.

In this state, transition T2 is activated and the token “
In step e3, the token "・" is a Petri net P, ? , immediately move to P5. However, in the 4-trinet d1, the input of the token "." is delayed by the processing time. Therefore, in step 4, it is determined whether the machining time has elapsed, and when the machining time has elapsed, the function flowchart changes to the one shown in FIG. 10B.

In this state, transition T3 is activated in step 5, and the token "." becomes movable and moves to places P4 and P5, and the function flowchart becomes as shown in FIG. 10C. Therefore, one workpiece is created,
The number is displayed as "1" in the total processing number column m. Next, in step @6, the processing machine system is evaluated. Note that this evaluation calculates the number of processes and the operating rate over time. Now, in source 6, the token "・" is generated according to the probability of failure rate of 1/1000, so
In step 7, it is determined whether the token "・" is placed in the place P6, and the token "・" is placed in the place P6.
If it is entered, the process moves to step @8 and the token "." is moved to place d2. Here, at place d2, the input of the token "・" is delayed by the stop time due to the failure, so after this stop time has passed, the token "bow is placed at place d".
2, the token "." enters place P5 again, after which the system evaluation is asked again. At this time,
The function flowchart is the same as in Fig. 10C. Next, move to Stella fe7 again and judge whether the token "・" is entered in place P6. If the token "・" is not entered, move from step all to ・12. and inserts the token "Naki" into place P3. Then, a token "." is generated every 20'±2" when the workpiece is transported from the source T1 and enters the place P1. Then, the function flowchart becomes the same as that shown in FIG. 10A again, and the process moves to step 3 to execute the above operation again. In this way, the total number of workpieces over time is displayed, and the operating rate thereof is determined.

Next, as shown in FIG. 11, the stain removal execution for the front conveyance system will be explained. This transport system has transport vehicle IQ
can be moved to each process 11, 12, 13, and 14, and when there are no more articles in the processes 11 to 14, the transport vehicle 10 is called to convey the articles. Now, the functional flowchart of this conveyance system is as shown in FIG. Note that the method for determining the functional flowchart is the same as that for the processing machine system described above.

North TIO, Place P101 Transition T11
．． Place pH and transsonion T12 represent the conveyance of the article. In addition, a place dlO is connected between the transactions Tll and T12, and this place al
Place dJf is connected to O. place til
O has the function of delaying the input of the token "・" by the time the conveyance vehicle 10 moves from the standby position 15 to the process positions 11 to 14, and the place dJ2 has the function of delaying the input of the token "・" by the time the transport vehicle 10 moves from the standby position 15 to the process positions 11 to 14.
The token “・
It has the function of delaying the thrust force. In addition, which process 11 to 14 is the process 11 to 14 that called the conveyance vehicle 10?
However, each travel time of the transport vehicle 10 is the same. The place dll is fed back from the transistor 7T13 to the transistor T21VC via the place P12. Note that this functional flowchart may have a configuration as shown in FIG. 13.

Next, we will discuss the 12th simulation of this conveyance system and its effect.
Using the function flowchart shown in Figure 14, the stains, rays,
This will be explained according to the flowchart. In step f1, a token is placed in the initial condition brace P12. A state in which a token is placed in this place P12 indicates that an article is missing in any of steps 11 to 14. Therefore, when the source TIO generates the token "・" in response to the call of the transport vehicle, the token "・" is entered in the place PIO and the transfer Tll is activated to generate the token "・" as the place pH and Move to Hid10. Here, the input of the place d 1011C token "." is delayed by the arrival time of the conveyance vehicle 10 to steps 11 to 14, and when the token r-J enters the place dlO as determined in step f14, the transition T12 occurs in step f5. is activated and the token “・” is added to the total number of conveyance column m
aK and move to place dll. This means that the article has been transported to steps 11-14. Then, in the place all, the transport vehicle 1o is in the steps 11 to 1.
Token “・” for the time from 4 to waiting position #t and return to 15
is delayed, and the token “
・” enters place dJJ, transition T13
is activated and moves the token "." to place P2.

Thus, one cycle of article conveyance is completed.

In this way, in the above-mentioned implementation sequence 2, the overall functionality of the system is converted into a functional flowchart that combines Petri net codes representing each functional element signal, and this functional flowchart operates according to the functions of the Petri net codes to perform simulation. Because it is structured as follows, it is possible to immediately convert it into a functional flow diagram of a mechanical system or transport system by simply memorizing the Petri net codes, which are of a small number of types.Furthermore, each functional element signal of the mechanical system or transport system can be manually input into this functional flow chart. This can easily cause stains, damage, and damage to mechanical systems and conveyance systems that are designed simply by simply using the machine.

If the converted function flowchart is stored in the Linet code storage means 4, it can be instantly and easily converted into a function flowchart for these systems simply by inputting the functional element signals of the mechanical system and transport system. Furthermore, systems that combine a mechanical system and a transport system can be simulated instantly and easily.

Then, from the results of stains, damage, and stains, we can evaluate the system, such as the number of workpieces produced, the operating rate of the mechanical system and conveyance system, and the parts of the system that are defective. You can investigate and improve defective parts.

Here, simulation sequences for various systems will be explained. FIG. 15 is a block diagram of a patch production system, which includes first and second continuously operating machines 20. :11. These machines 20.21 operate at 9 points where the number of input works reaches a predetermined value, and the patch output code 22.23
is provided. Now, the functional flowchart of such a system is as shown in FIG. The first and second continuously operating machines 20.21 have the same configuration as in FIG. 8 and are represented by Petri net codes as 24.25, and the patch output is the capacity CJ.

They are represented as C2 and C3. In addition, capacity C1
~ If C3 is lined up, the token "・" is input 8 times (the work is 8
It has a patch function that generates and outputs the token "・".

Further, as shown in FIG. 17, a functional flowchart for a system comprising a transport system having two transport vehicles 26 and 27 and a seven-stroke mechanical system 28 to 34 is as shown in FIG. One! 1shi, Q'1QJ with the same configuration as Fig. 12
A functional flowchart of article conveyance by K-Yoshi conveyance vehicles 26 and 27 is shown, and each process 28 is carried out by W1 to W7 having the same configuration as in FIG.
~340 function flowchart is shown to illustrate the function flowchart of the entire system.

In this way, a system that includes a plurality of mechanical systems and transport systems, and is configured by combining these systems, can be easily converted into a functional flowchart, and its simulation can be executed immediately.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. In other words, it can be applied not only to mechanical systems and transport systems but also to systems in which workers are involved. In this case, the content of the work performed by the worker may be expressed as a functional element signal using a Petri net code.

In addition, the code is not limited to the Petri net code, and a code having a similar function may be used to convert the code into a functional flowchart.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a system simulation device that allows even a first-time user to perform simulations immediately and easily.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing one embodiment of a system simulation device according to the present invention, FIG. 3 is a stain, range, and flow chart of the device of the present invention, and FIGS. 4 and 5 are diagrams of a Petri net. Figure 6 is a schematic diagram showing the processing machine system, Figures 7 and 8 are functional flowcharts of the processing machine system, Figure 9 is a simulation flowchart for the processing machine system, and Figures 1OA to 10C are Fig. 11 is a schematic diagram showing the configuration of the conveyance system,
Figures 12 and 13 are functional flowcharts for the conveyance system;
FIG. 14 is a simulation flowchart for the conveyance system, and FIGS. 15 to 18 are functional flowcharts of each system applied to the apparatus of the present invention. 1... CPU, J-J... flow chart conversion means, 1-2
...Simulation execution means, 1-3... System evaluation means, 2... Keyboard, 3... Program storage means, 4... Petri net code storage means, 5...
・Printer ζ 6...CRT display device. Applicant's Representative Patent Attorney Takeshi Suzue Industry 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 IOC Figure jlhl Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17

Claims (2)

[Claims] (1) An input means for inputting each functional element signal in the system, storing a plurality of codes for representing each of the functional element signals, and controlling the overall function of the system according to each functional element signal input from the input means. A system simulation characterized by comprising a flowchart converting means for converting the codes into a functional flowchart in which the codes are combined, and a simulation means for simulating the system by operating the functional flowchart according to the functional element signals indicated by the respective codes. Device. (2) The system simulation device according to claim (1), wherein the flowchart conversion means combines basic element codes of Petri nets and converts them into a functional flowchart of the entire system.