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實體及其屬性：
實體是被加工、處理或服務的對象，如顧客、産品、訂單等，它們在系統中移動、改變形 态、影響其他實體及系統狀态并影響着系統性能。實體可以附帶屬性屬性是對實體特性的描述.如産品實體可以具有類型、重量等屬性。 實體屬性可用于路線選擇等邏輯控制的目的。
在Flexsim中，實體被稱為流動實體（Flowitem），它具有一個内置屬性實體類型 （Itemtype）,如果要附加更多屬性，可以在實體上設定标簽（Label）。
Entities are the objects that are processed, processed or served, such as customers, products, orders, etc. They move in the system, change the shape, affect other entities and the status of the system, and affect the system performance. Entity can come with attributes An attribute is a description of entity properties. For example, the product entity can have the type, weight, and other attributes. Entity properties can be used for the purposes of logical control, such as route selection.
In Flexsim, an entity is called a flow entity (Flowitem), which has a built-in attribute entity type (Itemtype), and you can set the label (Label) if you want to attach more attributes.
活動：
活動是對實體執行的某種操作，它要消耗一定的時間。多數情況下，完成一項活動還需 要資源的參與。活動的例子如洗車、加工零件等。從仿真的角度看，我們并不在意活動的具 體内容和具體的操作方式，而是關心活動的延時，以及活動需要哪些資源這些共性的東西。 Flexsim中用Processor對象表示活動。
An activity is an operation performed on an entity that takes a certain amount of time. In most cases, resources are needed to complete an activity. Examples of activities such as car washing, machining parts, etc. From the perspective of simulation, we do not care about the specific content and the specific operation mode of the activity, but care about the delay of the activity, and what resources that the activity needs. Processor object in Flexsim.
資源：
資源是對實體進行加工處理時需要的任何事物，如人員、裝置或有限的存儲區域。當有 可用資源時，實體會占用該項資源（可能同時占用多個），并在完成服務後将其釋放。最好想 象成把資源配置設定給實體，而不要想象成把實體分派到資源上.因為有時一個實體（例如零件） 同時需要多個資源（如人員和機器）為其服務。
在Flexsim中，有時可以用Processor對象隐性表示資源（如機器），此時資源和活動合 為一體。此外，還可以用操作員、運輸機等移動資源對象顯性模組化資源。
Resources are anything needed to process entities, such as personnel, equipment, or limited storage areas. When a resource is available, the entity occupies the resource (possibly more at once) and releases it after completing the service. It is best to imagine allocating resources to entities, not as allocating entities to resources. Because sometimes an entity (such as a part) simultaneously needs multiple resources (such as people and machines) to serve it.
In Flexsim, sometimes Processor objects can implicitly represent resources (such as machines), when resources and activity are integrated. In addition, you can also use explicit modeling resources with mobile resource objects, such as operators and transport aircraft.
全局資料儲存：
模型需要存取一些全局資料，這些資料可以被模型中所有子產品在不同的位置通路 （讀取或寫入），這時必須有一種存儲全局資料的機制。全局資料存儲可以是全局變量、全局 表、外部Excel檔案或外部資料庫.Flexsim提供所有這些存儲機制。
The model requires access to some global data that can be accessed by all the modules in the model at different locations (read or write), and then there must be a mechanism to store the global data. Global data store can be a global variable, global table, external Excel file, or external database. Flexsim provides all of these storage mechanisms.
系統變量：
在Flexsim中，可以在對象的快速屬性窗體檢視簡單的狀态變量（如隊列的目前隊長）， 也可以利用儀表闆（Dashboard）定義和査看狀态變量（如目前隊長随時間變化的曲線）。
輸入變量、狀态變量、輸出變量的關系是：輸入變量的不同取值會導緻不同的狀态變量 取值,進而産生不同的輸出變量值（輸出變量是通過狀态變量計算出來的）。例如，不同顧客 到達時間間隔的均值（輸入變量）不同，導緻不同的隊長（狀态變量）變化，不同的隊長狀态變 化，又導緻不同的平均隊長（輸出變量）。
In Flexsim, you can view simple status variables (such as the current captain of the queue) in the quick attribute form of an object, and you can also use the dashboard (Dashboard) to define and see status variables (such as the current captain curve over time).
The relationship between input variable, state variable and output variable is: different values of input variables will lead to different state variable values, and then produce different output variable values (output variables are calculated through state variables). For example, the average value (input variable) of different customer arrival time interval is different, leading to different captain (status variable) change, different captain status change, and lead to different average captain (output variable).
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參考資料：《實用系統仿真模組化與分析》
翻譯：金山詞霸
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