KR101568644B1 - Event based integration simulation system for production and material handling and Simulation method thereof - Google Patents

Abstract

The present invention relates to a production-logistics integration simulation system and a simulation method. The production-logistics integration simulation system performs simulation by integrating production facilities for production processes of high technology components with logistics facilities for transferring products between the production facilities and includes an event object simulator, which modulates and defines the production facilities and the logistics facilities by types, and a simulation coordinator, which performs event reservations, event execution, and simulation time progress. The event object simulator includes a local event, which defines a state change at a time point of the production facilities or the logistics facilities to be simulated by the event object simulator, and a mirror event, which performs a local event, defined by an event object simulator in a different type. The event object simulator integrates the production facilities with the logistics facilities for each type and simulates the production facilities and the logistics facilities. The production-logistics integration simulation system can set an accurate production plan and can accurately evaluate production capability by integrating and simulating various kinds of production facilities and logistics facilities. In addition, the production facilities and the logistics facilities can be maintained and repaired in an easy manner and a new type of facilities can be added in an easy manner as the production facilities and the logistics facilities are modulated by types.

Description

[0001] The present invention relates to an event-based production-logistics integration simulation system and a simulation method,

The present invention relates to an event-based production-logistics integrated simulation system and method, and more particularly, to an event-based production-logistics integrated simulation system and a simulation method for modularizing and defining and integrating production facilities and logistics facilities by type will be.

The factories producing advanced parts such as LCD (Liquid Crystal Display) and semiconductors have various kinds of products to be produced, and the order of production process is different for each product type. Individual production processes are processed by a single production facility and consist of a wide variety of production facilities to accommodate different types of production processes. Such a production system is called a heterogeneous job shop. The transfer of the product between the production facilities in the advanced part production plant is carried out by a material handling system such as an inline stocker or a conveyor.

In these advanced parts manufacturing plants, production simulation has been used for production planning and production capacity evaluation. Conventional production simulations having this purpose are directed to a simplified order production system composed of only one type of production facility as in the prior art documents 1 to 5, and the automated distribution system is reflected in the production simulation as in the prior art documents 6 and 7 And it is difficult to accurately reflect the effects of the automated logistics system on the production system. On the other hand, as in the prior art document 8, the MCM (Model Communication Module) using a socket-based communication linking AutoSched AP and AutoMod is introduced for production-logistics integration simulation. However, It can not be added to the production simulation.

As such, the existing approach is not suitable for application to high-tech parts production plants made up of various types of production facilities, and since the production system can not be reflected in the production simulation, It can not be reflected in the simulation of the production efficiency deterioration due to the supply of the timely product to the production facility caused by the load on the weighted distribution system and the disruption of the transportation of the goods. Therefore, it is required to perform integrated simulation considering the linkage between the logistics system and the production system.

Vinod, V., and R. Sridharan. 2009. "Simulation-based Metamodels for Scheduling a Dynamic Job Shop with Sequence-dependent Setup Times." International Journal of Production Research 47 (6): 1425-1447. 2. Yin, J., and B. Chen. 2009. "The Simulation Expert System for Job Shop on-line Scheduling based on G2." In Proceedings of 16th International Conference on Industrial Engineering and Engineering Management. 860-863. 3. Mahdavi, I., B. Shirazi, and M. Solimanpu. 2010. "Development of a Simulation-based Decision Support System for Controlling Stochastic Flexible Job Shop Manufacturing Systems." Simulation Modeling Practice and Theory 18 (6): 768-786. 4. Parthanadee, P., and J. Buddhakulsomsiri. 2010. "Simulation Modeling and Analysis for Production Scheduling using Real-time Dispatching Rules: A Case Study in Canned Fruit Industry." Computers and Electronics in Agriculture 70 (1): 245-255. 5. Legato, P., and R. M. Mazza. 2001. "Berth Planning and Resources Optimization at a Container Terminal via Discrete Event Simulation." European Journal of Operational Research 133 (3): 537-547. 6. Sang Hoon Kong, 2007, "Two-step simulation method for automatic material handling system of semiconductor fab" Robotics and Computer-Integrated Manufacturing, Elsevier, 23, 409-420. 7. Devadas D. Pillai, Edward L. Bass, James C. Dempsy and Edward J. Yellig 2004 "300-mm Full-Factory Simulations for 90- and 65-nm ID Manufacturing" IEEE Transactions on Semiconductor Manufacturing. Michael Norman, Deron Tinsley, Jerry Barksdale, Otto Wiersholm, Philip Campbell and Edward MacNair, "Process and Material Handling Models Integration", Proceeding of the 1999 Winter Simulation Conference, 1262-1267. 9. Schruben LW (1983). Simulation modeling with event graph models. Communications of the ACM 26 (11): 957-963.

The present invention has been developed in view of the above-mentioned needs, and it is an object of the present invention to provide an event-based production-logistics integrated simulation system and a simulation method capable of defining an accurate production plan and evaluating a production capacity by modularizing, .

In order to solve the above problem, the production-logistics integrated simulation system according to the present invention includes a series of production processes for processing a process corresponding to a product conveyed to a cassette by a logistics facility, An event object simulator for processing a cassette containing products placed in the output port of the production facility after the process is completed to an input port of the production facility for processing the next process, And a simulation facility (Simulation Coordinator) for performing event scheduling, event execution, and simulation time progress between the logistics facility event object simulator and the logistics facility event object simulator, wherein the production facility and the logistics facility event object simulator are each defined by a type, Point of view of logistics facilities And a mirror event (Mirror Event) for executing a local event defined in a different type of event object simulator, the production facility and the logistics facility are modularized and defined by type, And integrating and simulating production facilities and logistics facilities according to types.

In one embodiment of the present invention, the simulation coordinator includes a local event list for storing local events generated by the event object simulator, a local event list for sequentially fetching local events stored in the local event list, A local event forwarding module for forwarding and processing the event to the simulator, and a time progress module for advancing the simulation time at the reservation time of the local event having the earliest reservation time in the local event list.

In an embodiment of the present invention, the production facility event object simulator includes a Uni-inline system in which a newly arriving cassette arrives at an input port of a production facility and, when the processing is completed in the production facility, A Cell Event Object Simulator and a Bi-inline Cell Event Object Simulator that arrives at an input port of a production facility when a new arriving cassette is received and is inserted into an arbitrary empty cassette of an output port upon completion of process processing at a production facility.

In one embodiment of the present invention, the logistics facility event object simulator includes an inline stocker event object simulator that simultaneously performs a storage and a return function, and an output port of a destination inline stocker and an output port of a destination inline stocker for unidirectional logistics transfer between two inline stockers. And a conveyor event object simulator for connecting the input port.

In an embodiment of the present invention, the inline stocker is located at an input / output port of a production facility, and includes a shelf capable of storing a cassette, another inline stocker, a stocker input / output port for transporting goods, and a crane and a crane.

In one embodiment of the present invention, the Uni-inline Cell event object simulator includes an X2 Uni-inline Port (X2PU), a First Glass Loading (FGL), and a Last Glass Loaded), a local event of a CD (cassette depart) and a local event defined in the inline store.

In one embodiment of the present invention, the Bi-inline Cell event object simulator includes X2PI (X to In-Port), FGL (First Glass Loading), FGP Processed), LGL (Last Glass Loaded), FGU (First Glass Unloading), X2PO (X2PO), CD (Cassette Depart) It is defined as a mirror event of MEC and Move.

In an embodiment of the present invention, the inline stocker event object simulator includes a local event of a move to change a state of an input / output port where a cassette is located to a transfer reservation state, a local event of a MEC for putting a cassette into which all products are inserted, Events, five transport types: Stocker Input port to X ready, PI2Xr, Out2 port to X ready, PU2Xr to Uni-inline Port to X ready, B2Xr Stocker Buffer to X ready), five return types: Stocker Input port to X, PI2X to Out-Port to X, and Uni-inline Port to X ), A local event of B2X (Stocker Buffer to X), a Cassette Unload (CU) defining a change of state at the crane view, a local event of CI (Crane Idle), a destination of X2B (X to Stocker Buffer ), X2PI (X to In-Port), X to Out-Port (X2PO) for executing local events defined in the Bi-inline Cell, A mirror of an X2SO (X to Stocker Out-Port) that executes a mirror event, an X2 Uni-inline Port (X2PU) executing a local event defined in the Uni-inline Cell, and a local event defined in the conveyor Event. ≪ / RTI >

In one embodiment of the present invention, the conveyor event object simulator includes a X2SO (X to Stocker Out-Port), an SOC (Start of Convey), and an EOC (End of Convey) local event And a mirror event of a C2SI (Convey to Stocker In-port) that executes a local event defined in the inline stocker.

As an embodiment of the present invention, the apparatus may further include a FabIn Event Object Simulator for inputting a raw material into a production factory, and a FabOut Event Object Simulator for exporting finished products. do.

According to the present invention, there is provided a production-logistics integrated simulation method comprising: an event object simulator for modifying and defining a production facility for production of an advanced part and a distribution facility for transferring a product between production facilities, The method comprising: storing a local event generated by the event object simulator and defining a state change at each time point in a local event list; sequentially extracting a local event stored in the local event list and generating the local event; Forwarding and processing the event information to the event object simulator, and advancing the simulation time to a local event time having the earliest reservation time in the local event list.

The present invention can integrate and simulate an automated logistics system simulation in a production simulation of a high-tech parts manufacturing factory such as a semiconductor or an LCD, thereby obtaining a more accurate and realistic production plan.

In addition, the present invention modularizes the production facilities and the logistics facilities according to the type, so that the event object simulator can be created and implemented and can be linked easily, so that the fluctuation due to the introduction of the facility on the spot can be quickly reflected in the simulation.

1 illustrates an event-based production-logistics integrated simulation system in accordance with the present invention.
2 is an event graph showing a simulation coordinator according to the present invention.
3 is a flow chart of a product processing in a Uni-inline cell according to the present invention.
4 is an event graph illustrating an event object simulator of a Uni-inline cell according to the present invention.
5 is a flow chart of a product processing in a Bi-inline cell according to the present invention.
6 is an event graph illustrating an event object simulator of a Bi-inline cell according to the present invention.
7 is a product delivery flow chart in an inline stocker according to the present invention.
8 is an event graph illustrating an event object simulator of an inline stocker according to the present invention.
9 is a product delivery flow diagram in a conveyor according to the present invention;
10 is an event graph showing an event object simulator of a conveyor according to the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 illustrates an event-based production-logistics integrated simulation system according to the present invention. The integrated production-logistics simulation system includes an event object simulator and a simulation coordinator, And the logistics facilities responsible for product transfer between production facilities and production facilities can be integrated and simulated.

The event object simulator can be defined by modularizing production facilities and logistics facilities by type. The individual event object simulator is defined by the types of production facilities (Uni-inline Cell, Bi-inline Cell, Chamber, Oven) and logistics facilities (Inline Stocker, Conveyor) Are defined as an event graph, which is an event-based modeling method such as the prior art document 9. [

The event graph is composed of an event that indicates when the state change of the system occurs and a connection line that defines the causal relationship between the events. Existing event graphs are implemented as a single simulator for the entire system. If the event graph is composed of various types of production facilities and logistics facilities, such as production systems, simulation implementation becomes difficult. Therefore, modularization that defines the event object simulator based on the event graph for each type of production facility and logistics facilities ensures ease of implementation of simulation software and convenient maintenance.

In addition, the event object simulator includes a local event and a mirror event. The local event may define a state change at the point of the production facility or the logistics facility that the event object simulator is intended to simulate, and the mirror event may execute a local event defined in another type of event object simulator. Through this, it is possible to simulate the integrated production facilities and logistics facilities.

A local event has a state change that updates a state variable as the local event indicates the time of a major state change in the production facility or the logistics facility that the event object simulator is trying to simulate. However, a mirror event is an event for executing a local event defined in another event object simulator, and does not have a state change.

FIG. 2 is an event graph illustrating a simulation coordinator according to the present invention, in which the simulation coordinator can perform an event reservation, an event execution, and a simulation time between the event object simulators to perform a connection relationship between individual event object simulators and a simulation execution.

The simulation coordinator includes a local event list, a local event delivery module, and a time progress module. The local event list stores local events generated by the event object simulator. The local event delivery module sequentially takes out the local events stored in the local event list, and transmits and processes the local events to the generated event object simulator , The time progress module may proceed with the simulation time with the reservation time of the local event forwarding module and the local event having the earliest reservation time in the local event list.

The simulation coordinator receives the execution schedule of the local event to be processed by the event object simulators participating in the production-logistics integration simulation through the ScheduleLocalEvent function, and stores it in the local event list which is a variable of the list type. Takes local events one by one from the local event list and calls the ExecuteLocalEvent function of the event object simulator that generated the local event to execute the event routine of the fetched local event.

The local event list is a data structure that manages and arranges the local events scheduled by the event object simulators based on the reserved time. The simulation coordinator has a local event list and an integer variable SC, which indicates whether the simulation coordinator is currently operating. The SC has a value of 0 if the Simulation Coordinator is currently processing local events, -1 if it is reserved to execute other local events, and 1 if it is waiting.

The simulation coordinator is defined as four events: ScheduleLE, GetNextLE, ExecuteLE, and Terminate. The ScheduleLE event stores the local event e, which is transmitted from the event object simulator, in the local event list, and executes the GetNextLE event when the simulation coordinator is available (that is, SC = 1). The GetNextLE event changes the current state of the Simulation Coordinator to 0 (SC = 0) for local event execution. After the change, the local event (e) having the earliest reservation time is extracted from the local event list, the remaining time (ts) from the current time to the reservation time (e.Time) of the local event is calculated, Let the event run. However, when the scheduled time of the local event exceeds the defined simulation end time (t _EOS ), a Terminate event is executed. The ExecuteLE event calls the ExecuteLocalEvent function to execute the event routine defined in the event object simulator of the local event (e) (ExecuteLocalEvent (e)).

If the local event to be executed next is present in the local event list (| LEL |> 0), the current state of the simulation coordinator is changed to the reserved state (SC = -1) Change the value of the RSV variable of the form to a true value (RSV = true). If there is no local event to execute, change the current state of the simulation coordinator to the available state (SC = 1) and set the RSV variable value to a false value (RSV = false) so that the GetNextLE event is not executed. Simultaneous simulations involving event object simulators that simulate different types of equipment are performed by repeating this process, and local events stored in the local event list are processed in the order of local events having the fastest reservation time, .

The event object simulator includes a production equipment event object simulator and a logistics equipment event object simulator. The production facility event object simulator can process a series of production processes that process the process corresponding to the product transported to the cassette by the logistics facility and bring the processed product to the cassette. Also, the logistics facility event object simulator can process the cassette containing the products located at the output port of the production facility to the input port of the production facility to process the next process.

The production facilities used in general advanced parts manufacturing plants are divided into 4 types as 1) Uni-inline cell, 2) Bi-inline cell, 3) Oven-type equipment and 4) Chamber-type equipment. Among them, the present invention includes event object simulators of Uni-inline cell and Bi-inline cell production facility which have high asset value and process main production process.

In individual production facilities, the process is processed as individual product units, but when the product is transported between production facilities, the products are transported in a transport device called a cassette. In addition, the high-tech parts manufacturing plant is a heterogeneous job shop. There are various product types according to the customer's order and have different process orders for each product type. This defines the variable cst, which defines the cassette as the transport unit, and has the following properties:

- cst.id: the number of the cassette (integer only for each cassette)

- cst.j: Product type of the products in the cassette (string type)

- cst.p: the next process name of the products in the cassette (string type)

- cst.n: Number of products in the cassette (integer type)

- cst.a: Name of the facility to be moved next from the current position of the cassette (string type)

- cst.b: the name of the facility that was located before the current location of the cassette (string type)

- cst.c: Name of the facility where the cassette is currently located (string type)

- cst.r: Traverse path to the destination where the cassette is to be traversed (list type)

In addition, the following functions are provided so that the attribute of the above cassette can be easily made

- cst.ShiftRoute (): Called before moving from one installation to the next, deletes the first entry in cst.r.

   cst.r [i] = cst.r [i + 1]; for i = 0, 1, ...

- cst.UpdatePlace (m): Changes the current position of the cassette to m.

  cst.b = cst.c; cst.c = m; cst.a = cst.r [1];

In addition, the production facility has input / output ports on which the cassettes can be located, their states being defined by the P [] variable, and the input / output port (P [m]) of the production facility m has the following attributes.

- P [m] .x: Number of empty ports in I / O port (integer type)

- P [m] .rx: Number of ports reserved in I / O port (integer type)

- P [m] .f: Number of ports occupied by the full cassette in the I / O port (integer type)

- P [m] .e: Number of ports occupied by empty cassette in I / O port (integer type)

It also has the following functions for changing the port state:

- P [m] (rx → f): Changes the state of one port from the reserved state to the full cassette occupied state.

- P [m] (f → e): Changes the state of one port from the full cassette occupied state to the empty cassette occupied state.

- P [m] (e → x): Changes the state of one port from empty cassette occupied state to empty port state.

- P [m] (x → rx): Changes the state of one port from the empty port state to the reserved state.

A cassette that has been processed in a production facility shall be assigned a facility to process the next and subsequent processes. To do this, we define a function that defines the following real-time allocation rules.

- NextStep (cst): Returns the next process name from the product type (cst.j) of the cassette (cst) and the current process name (cst.p).

NextEQP (cst): Selects one of the facilities that can process the next process of the cassette from the product type (cst.j) of the cassette (cst) and the next process name (cst.p) and returns it.

In order for cassettes to be transported by the logistics facility, the list of logistics facilities (cst.r) must be updated from the current location to the destination facility. This is done by the Route (cst) function.

Production Facility The Event Object Simulator targets the process from the moment the product arrives at the entrance of the production facility to the completion of the process within the facility and before it is transferred by the logistics facility.

The production facility event object simulator includes a Uni-inline Cell event object simulator and a Bi-inline Cell event object simulator.

FIG. 3 is a flowchart of a product processing in a Uni-inline Cell according to the present invention. In the Uni-inline Cell event object simulator, the production facility event object simulator receives a newly arriving cassette at an input port of a production facility, When processing is complete, the products are imported into the same cassette located at the input port.

The Uni-inline Cell is an internal unit that processes the product process such as wafer or glass, and a large number of I / O units that are waiting for the newly arrived product to wait for the process to be processed, Ports (I / O Ports).

Products are contained in cassettes when transported by logistics facilities. When a cassette containing a certain quantity of products arrives at the input / output port, a track-in robot takes out the individual products contained in the cassette one by one and inserts them into the internal equipment at a predetermined time interval (= The product that has undergone a series of detailed processes for a certain period of time (= flow time) in the internal facility is transferred to the cassette that was belonged to when it arrived by the input robot again. When all the products contained in one cassette have been processed, the cassette is transported by the logistics facility to the production facility that will handle the next process.

FIG. 4 is an event graph illustrating an event object simulator of a Uni-inline Cell according to the present invention, wherein the Uni-inline Cell event object simulator includes an X2 Uni-inline Port (X2PU) ), FGL (First Glass Loading), LGL (Last Glass Loaded), CD (Cassette Depart) and local events defined in the inline store.

The event object simulator of the Uni-inline Cell defines the following variables to define the state of the facility u of the Uni-inline Cell type.

- B [u]: A queue-type array variable that stores the cassette located at the input / output port of the individual facility

- R [u]: integer array variable indicating the state of the input robot

- t ₁ [u, cst]: an array variable having the time required to put all the products in the cassette cst

- π [u, cst]: an array variable with time to process one product in the cassette cst

- P [u]: Variable indicating the status of the I / O port

The X2PU local event defines the state change when the new cassette arrives at the input / output port (PU) of the uni-inline cell by the logistics facility. (Cst.UpdatePlace (u)), add the cassette to the port queue (cst → B [u]), update the current position of the cassette transferred at this point to the uni-inline cell ), Thereby changing the state of the corresponding input / output port from the reserved state to the new cassette occupied state (P [u] (rx → f)). If the uni-inline cell input robot is available, the arriving cassette is reserved for input to the internal equipment (RSV = RsvR (u)) and executes the next local event FGL.

The FGL local event defines the state change when the first product of the cassette is inserted into the internal equipment by the input robot. First, the cassette cst to be input to the internal equipment is selected in the port queue B (B [u] → cst), and the state of the input robot is set to the active state (R [u] = 0). The time required to put all the remaining products in the cassette is defined as t ₁ [u, cst], and the state of the input robot is changed to the available state at the LGL local event (R [u] = 1), the input / output port at which the cassette is located is changed to the empty cassette state (e) (P [u] (f → e)). After all the products have been processed in the internal facility, they are transferred to the existing cassettes.

The CD local event defines the state change at the time of transfer to the cassette to which all products have been assigned: 1) determine the next process of the cassette (cst.p = NextStep (cst)), 2) (Cst.d = NextEQP (cst)), 3) calculate the route from the present facility to the next facility, and update the route to the next destination (Route (cst); cst. ShiftRoute ()). After the CD local event is executed, it executes the Move local event defined in the event object simulator of the inline stocker for the transport of the cassette.

5 is a flow chart of a product processing in a Bi-inline cell according to the present invention. When a newly arriving cassette arrives at an input port of a production facility and process processing is completed in a production facility, a Bi- In the empty cassette.

Unlike in-line cells, Bi-inline Cells have an input port (In-Ports) in which a cassette containing products to be processed arrives and waits, and a cassette that holds processed products Output ports (Out-Ports) are distinguished. The arrival of the new cassette and the processing of the internal equipments are the same as the Uni-inline cell, and the processed products are transferred to the empty cassette located at the output port by the track-out robot.

6 is an event graph illustrating an event object simulator of a Bi-inline Cell according to the present invention, wherein the Bi-inline Cell event object simulator includes X2PI (X to In-Port) defining a state change in the Bi- , First Glass Loading (FGL), First Glass Processed (FGP), Last Glass Loaded (LGL), First Glass Unloading (FGU), X to Out-Port (X2PO), and Cassette Depart It can be defined as a mirror event of MEC and Move that executes defined local events.

The event object simulator of Bi-inline Cell defines the following variables to define the state of facility b of Bi-inline Cell type.

- IQ [b]: a queue-type array variable that stores the cassette located at the input port

- OQ [b]: a queue-type array variable that stores the cassette located at the output port

- RI [b]: an integer array variable indicating the state of the input robot

- RO [b]: an integer array variable indicating the state of the exporting robot

- t ₁ [b, cst]: an array variable having the time required to put all the products in the cassette cst

- t ₂ [b, cst]: an array variable having the time required for the product in the cassette cst to be inserted and to complete the process

- PI [b]: variable indicating the state of the input port

- PO [b]: variable indicating the status of the output port

When the new cassette arrives at the input port PI of the Bi-inline Cell (b) by the logistics facility, the X2PI local event is executed, the current position of the cassette is updated (cst.UpdatePlace (b)), (PI [b] (rx → f)) from the reservation state to the new cassette occupied state (PI [b] (rx → f)) and the state of the input port on which the cassette is loaded ) Is available, and executes the FGL local event.

The FGL local event defines the state change at the time when the first product in the cassette is inserted into the internal facility by the input robot. The state of the input robot is changed from the available state to the active state (RI [b] = 0), and the cassette of the input queue is deleted (IQ [b] → cst). It takes time t ₁ [b, cst] from the time when the first product is inserted to the time when the last product is inserted, and the LGL local event is executed at this time. It takes time t ₂ [b, cst] until the first product is inserted and the process is completed. At this time, the FGP local event is executed.

The LGL local event defines the state change at the time the last cassette product is inserted. If there is a cassette to input into the input queue (IQ), reserve the input robot (if (| IQ [b] |> 0) {RI [ b] = - 1}, otherwise, the input robot changes to the idle state (RI [b] = 1). Executes an FGL local event to populate the next cassette in the input queue, and executes an MEC mirror event to put the inline stocker down on the input port for all currently loaded cassettes.

The FGP local event defines the state change when the first product of the cassette is inserted into the internal facility and the process is completed. (C2 = RsvRO (b)) if the cassette is added to the output queue (OQ) (cst? OQ [b]) and the carrying robot RO is available. When the exporting robot is reserved (C2≡true), the FGU local event is executed. The FGU local event defines the state change at the time when the first introduced product is unloaded by the unloading robot to a blank cassette located at the output port after processing. State of the carry-out robot is changed to the active state (RO [b] = 0) , and the cassette is removed from the output queue (OQ), until the rest of the products are to be exported by both the carry-out robot t ₁ [b, cst] Time And then a CD local event is executed.

The CD Local Event defines the state change at the point when all products in one cassette have been processed into the Bi-inline Cell's internal facility and placed in the empty cassette of the output port. The status of the corresponding output port is changed from the empty cassette to the cassette occupied state (PO [b] (e → f)), and a vacant cassette exists in the output port (PO [b] .e> 0) If there is a product, it reserves (| OQ [b] |> 0) the leaving robot RO [b] and executes the FGU local event. Otherwise, the export robot changes to the available state (RO [b] = 1). (Cst.P = NextStep (cst); cst.d = NextEQP (cst)) to set the next process and equipment of the cassette to be transferred to the next process (cst.ShiftRoute ()), and updates the movement path to the immediately following moving destination.

There must always be a blank cassette in the output port to contain the processed products. The X2PO local event defines the state change when the logistics facility transfers empty cassettes to the output port. At this time, the state of the output port in which the empty cassette is located is changed from the reserved state to the empty cassette state (PO [b] (rx → e)) and if the cassette is the only empty cassette of the output port, Executes FGU local events so that queued products can be exported.

The logistics facility event object simulator includes an inline stocker event object simulator and a conveyor event object simulator.

FIG. 7 is a product transfer flow chart in the inline stocker according to the present invention in which the inline stocker event object simulator performs storage and transfer functions at the same time and is located in the input / output port of the production facility, And a crane for transporting the cassettes between the stocker input / output ports and the shelves for transporting the goods.

The inline stocker s has an Stocker In-port SI connected to the incoming conveyor c _i and an Stocker Out-port SO connected to the outgoing conveyor c _j , And a number of stocker buffers (B). In addition, in-line Stalker Bi-inline cell (b _i) an input port (PI [b _i]) of the is connected to an output port (PO [b _i]), two Uni-inline Cell (u _i, u _j Output ports P [u _i ] and P [u _j ] of the input / The crane of the inline stocker is responsible for the cassette transfer between the input port, the output port, the shelf, and the input / output port of the production facility.

When the cassette to be transported is determined, the inline stocker's crane is ready to move to the location where the cassette is located, 2) starts moving at the current position, picks up the cassette to be transported, and 3) . In the inline stocker, the positions where the cassette can be picked up are the inline stocker input port SI, the input / output port PU of the uni-inline cell, the input port PI of the bi-inline cell, The inline stocker's output port SO, the uni-inline cell input / output port PU, the bi-inline cell input port PI, and the inline stocker shelf B, , The output port (PO) of the Bi-inline cell, and the shelf (B) of the inline stocker.

8 is an event graph illustrating an event object simulator of an inline stocker according to the present invention, wherein the inline eventor simulator includes a cassette transfer from an input port of an inline stocker connecting an incoming conveyor, Cassette transfer, 11 local events defining the cassette transfer from the input / output ports of the Uni-inline Cell, CU (Crane Unload) local event describing the state change at the time when the cranes arrive at the destination, CI (Crane Idle) describing the state change at the time when this idle state is changed. As the local event and the crane drop the cassette to the destination, the destination (the output port of the inline store, the input port and output port of the Bi- I / O ports of Uni-inline Cells) Four mirrored events It can be defined as.

The cranes are equipped with five transport types, SI2Xr (Stocker Input port to X ready), PI2Xr (In-Port to X ready), PO2Xr (Out-Port to X ready), PU2Xr (Stocker Input port to X), PI2X (In-Port to X), and Stocker Buffer to X ready (B2Xr) ), PO2X (Out-Port to X), PU2X (Uni-inline Port to X), and B2X (Stocker Buffer to X).

When the cranes arrive at their destination, the loaded cassette is dropped, which means that the destination is the local event of X2B (X to Stocker Buffer), the shelf of the inline stocker, X2PI A mirror event of X2PO (X to Uni-inline Port) that executes a local event defined in the Uni-inline Cell, and a mirror event of X2PU (X to Un-in-Port) Which can be defined as a mirror event of X to Stocker Out-Port (X2SO) that executes a local event.

For example, a cassette arriving at the input port of an inline stocker by an incoming conveyor will be transported to one of the five destination types when the crane picks it up. In this case, when the destination is the input port (PI) of the Bi-inline cell, the crane performs SI2Xr transfer from the current position to the input port (SI) of the inline stocker, To the input port (PI) of the cassette, and then to the destination PI (X2PI) to complete the transportation of the cassette.

Also, it is defined as a Cassette Unload (CU) local event that defines the state change at the time when the cranes drop the cassette to its destination, and a CI (Crane Idle) local event at the time when the subsequent cranes change to the idle state.

In addition, the event object simulator of the inline stocker defines the following variables to define the state of a specific inline stocker s.

- SI [m, c]: variable defining the state of the input port of the inline stocker m to which the incoming conveyor c is connected

- SO [m, c]: variable defining the state of the output port of the inline stocker m to which the outgoing conveyor c is connected

- cr [s]: an array variable that defines the state of the crane in the inline store

- WIP [s]: an array variable that defines the number of cassettes waiting on the shelf of the inline storeer s

- tr [s]: an array variable with the time it takes for the crane of the inline storeer s to pick up the cassette from the current position to an arbitrary point

- td [s]: An array variable with the time it takes for the crane of the inline stocker to have a cassette from the current position to an arbitrary point and move

The inline store event object simulator may include a move and an MEC local event. move is a local event that changes the state of the input / output port where the cassette is located to the transfer reservation state, and MEC is a local event to put the cassette loaded with all products into the input port.

Uni-inline Cell (u _i) and executes a Move event of in-line in order to transport the stocker cassette is complete, a process handling equipment of the next process. Move Local event changes the state of the input / output port where the cassette is located to the transfer reservation state (P [u _i ] (e → dr)) and updates the cassette position to the inline store (s) where the input / output port is located. If an inline stocker's crane is available, it will reserve the crane and execute the PU2Xr local event.

In the PU2Xr local event, since the crane starts to move, the crane state is changed to the active state (cr [s] = 0) and the time required for the crane to move to a certain point It then executes the PU2X local event.

PU2X local events in the Uni-inline Cell (u _i) as the cassette compel the crane changing the status of the port transferred to the empty state in the reserved state _{(P [u i] (dr} → x)) in the input and output ports of , The CU local event is executed after the time td, which is the time taken for the crane to carry the cassette to its destination.

In the CU local event, the state change at the time of placing the cassette carried by the crane on the destination is defined. First, the cassette will update the traversing path (cst.r) (cst.ShiftRoute ()), the cranes will change to the idle state, execute the CI local event, and if the destination is the shelf of the inline stalker, Executes the X2SO mirror event when it is the output port of the inline stalker, executes the X2PI mirror event when it is the input port of the Bi-inline cell and executes the X2PO mirror event when it is the output port of the Bi-inline cell And executes the X2PU mirror event when it is an input / output port of Uni-inline Cell.

By executing a series of events as described above, the cassette transfer from the input / output port of the Uni-inline Cell to the five destinations is realized. Likewise, the beginning of the cassette transfer at the output port and input port of the Bi-inline Cell and at the input port of the inline stocker is implemented in a similar manner.

9 is a product conveyance flow chart in a conveyor according to the present invention in which a conveyor event object simulator can connect an output port of a source inline stocker and an input port of a destination inline stocker for unidirectional logistics transfer between two inline stockers.

The conveyor is responsible for cassette transfer between the Stocker Out-port (SO) of the inline stocker (s _i ) and the Stocker In-port (SI) of another inline stocker (s _j ). The cassette moved to the inline stocker output port by the crane of the inline stocker is moved to the input port of the destination inline stocker connected by the conveyor. At this time, conveying time is determined by tc. However, if the input port of the objective inline stocker is occupied by another cassette, it waits in the conveyor.

FIG. 10 is an event graph showing an event object simulator of a conveyor according to the present invention, wherein the conveyor event object simulator includes an X to Stocker Out-Port (X2SO) defining a state change in the conveyor, a Start of Convey (SOC) It can be defined as a mirror event of C2.11 (Convey to Stocker In-port) that executes local event of EOC (End of Convey) and local event defined in inline stocker.

The conveyor's event object simulator defines the following variables to define the state of a particular conveyor c:

- SO [m, c]: variable defining the state of the output port of the inline stocker m to which the conveyor c is connected

- CQ [c]: a queue-type array variable that stores pending cassettes that have been transported at the end of the conveyor

- tc [c]: an array variable with a cassette feed time from the start point to the end point on the conveyor c

The X2SO event indicates that the cassette arrives at the output port of the inline stocker connected to the conveyor (c: conveyor ID) by the crane of the originating inline stocker. Thus, the current position information of the cassette is updated (cst.UpdatePlace (c)), and the state of the output port of the inline stocker is changed to the occupied state (SO [cst.b, c] = 0).

The SOC event is an event that defines that the cassette moved to the output port of the inline stocker starts to be conveyed by the conveyor, thereby changing the state of the output port of the previously occupied inline stocker to the available state (SO [cst.b , c] = 1). When the transfer starts on the conveyor, the transfer time to the input port of the destination inline stocker (cst.a) to which the conveyor is connected is defined as tc [c], and the EOC event is executed after the completion of transfer.

In the EOC event, the transported cassette is stored in the transported cassette queue CQ [c] (cst? CQ [c]). (RSV = RsvSI (cst.a, c)) and updates the movement route information of the cassette (cst.ShiftRoute ()) if the input port of the destination inline stocker (cst.a) is available. When the input port of the destination inline stocker is reserved, the C2SI event of the event object simulator of the inline stocker is executed as the cassette is transferred to the input port of the inline stocker.

The event object simulator may further include a FabIn Event Object Simulator for inputting a raw material in a production factory and a FabOut Event Object Simulator for exporting finished products.

The production-logistics integrated simulation method according to the present invention is produced by an event object simulator which defines a production facility for production of high-tech parts and a distribution facility for transferring products between the production facilities, Sequentially storing local events stored in the local event list and delivering and processing the local events to the event object simulator that has generated the local events; And advancing the simulation time with the reservation time of the local event having the local event.

The production-logistics integrated simulation system according to the present invention can integrate automation logistics system simulation into the production simulation of a high-tech parts production factory such as a semiconductor or an LCD, thereby obtaining a more accurate and realistic production plan, , It is possible to easily create an event object simulator by creating and implementing an event object simulator, so that it is possible to quickly reflect the fluctuation due to introduction of the facility on the site.

Claims (9)

A production equipment event object simulator for processing a series of production processes for processing a process corresponding to a product transported by a cassette by a logistics facility and for bringing a processed product into a cassette;
A logistics facility event object simulator for processing the cassette containing products located at the output port of the production facility after the completion of the process processing to the input port of the production facility for processing the next process
And a simulation coordinator for performing event scheduling, event execution, and simulation time progress between the production facility and the logistics facility event object simulator,
The production facility and the logistics facility event object simulator are defined as a local event that defines a state change at the time of a production facility or a logistics facility to be defined for each type and a local event that defines a local event Including a mirror event (Mirror Event)
The production-logistics integrated simulation system is characterized by modularizing production facilities and logistics facilities by type, and integrating production facilities and logistics facilities by type. 2. The apparatus of claim 1, wherein the simulation coordinator comprises:
A local event list storing a local event generated by the event object simulator;
A local event delivery module for sequentially taking out the local events stored in the local event list and delivering and processing the local events to the generated event object simulator,
And a time progress module for progressing the simulation time to the reservation time of the local event having the earliest reservation time in the local event list. The production equipment event object simulator of claim 1,
A Uni-inline Cell event object simulator in which products arrive at the same cassette located at the input port when the newly arriving cassette arrives at the input port of the production facility and the process is completed at the production facility, and
And a Bi-inline Cell event object simulator for bringing a newly arriving cassette to an input port of the production facility and being carried into any empty cassette of the output port when the process is completed in the production facility. . The method according to claim 1, wherein the logistics facility event object simulator comprises:
An inline stocker event object simulator that simultaneously performs storage and return functions; and
And a conveyor event object simulator for connecting the output port of the starting inline stocker and the input port of the destination inline stocker for unidirectional logistics transfer between the two inline stockers. 4. The method of claim 3, wherein the Uni-inline Cell event object simulator comprises:
Local events defined in X2PU (X to Uni-inline Port), FGL (First Glass Loading), LGL (Last Glass Loaded), and CD (Cassette Depart) that define state changes in Uni-inline Cells Wherein the event is defined as a mirror event of a Move that executes an event. 4. The method of claim 3, wherein the Bi-inline Cell event object simulator comprises:
First Glass Loading (FGL), First Glass Processed (FGP), Last Glass Loaded (LGL), First Glass Unloading (FGU), and X2PO X to Out-Port), local events on CD (Cassette Depart), and local events defined on inline stalkers. MEC, and Move. The production-logistics integrated simulation system according to claim 1, 5. The method of claim 4, wherein the inline stocker event object simulator comprises:
A local event of Move to change the state of the input / output port where the cassette is located to the transfer reservation state, a local event of the MEC to put the cassette in which all the products are inserted into the input port, five transfer types, SI2Xr (Stocker Input port to X ready) , Local events of P2Xr (In-Port to X ready), PO2Xr (Out-Port to X ready), PU2Xr (Uni-inline Port to X ready), B2Xr (Stocker Buffer to X ready) (Stocker Input to X), PI2X (In-Port to X), PO2X (Out-Port to X), PU2X (Uni-inline Port to X), B2X Local event of CU (Cassette Unload), CI (Crane Idle) defining destination change, Local event of destination X2B (X to Stocker Buffer) which is the shelf of inline stocker, Local event defined in Bi-inline Cell , X2PI (X to In-Port), X2PO (X to Out-Port) mirror event, and X2PU (X to Uni-inline Port And a mirror event of X2SO (X to Stocker Out-Port) that executes a local event defined in the conveyor. 5. The method of claim 4, wherein the conveyor event object simulator comprises:
C2IS (Convey to Stocker) that executes the local events defined in X2SO (X to Stocker Out-Port), SOC (Start of Convey), EOC (End of Convey) In-port < / RTI > mirror event. delete

Images