The model still is not ended but some of the variable presents can be defined. The level “Inventory” is defined first of all.

1. To select the level “Inventory”, to cliccare two times on it in order to open the window of the property;
2. In the box of the units to select wdg-widgets;
3. In the box of definition to insert the number begins them of objects (widget) present in the inventory, as an example 400.

Applying these modifications to scompare “?“on the symbol “Inventory” since the variable one it is hour correctly defined.
However the points interrogated to you on the other variable ones are still present since they still must be defined in similar way.

Figure 3.8- Window of definition of the property of the variable ones

3.10 Definire the time constant

The constant of time “Time to Correct Inventory” represents the time necessary in order to modify the inventory puts into effect them so that it equals the wished inventory.
The time delay (delay) in order to fill up the inventory was six weeks, that it is also the value of the time constant.
In Powersim Study the equation can be introduced that directly defines the variable one in the field in which the name becomes part, without the necessity to open the window of the property.
This is favorable above all in defining the constants.

1. To select helping “Time to Correct Inventory”;
2. To write the expression =6<> like shown in the figure under;
3. After to have written this expression and pressed Enter the variable one is defined and to scompare “?“

Figure 3.9- The equation of the variable one in the symbol of the name of the variable one can be inserted directly

3.11 temporary Definition of Desired Inventory

Even if the variable “Desired Inventory” will come later on redefined, can be assigned a temporary value for being able to define the variable “Production”.
Therefore, at the beginnig of the simulation, in which every thing he is stable can be settare its equal value to that one of the inventory and therefore 400 < < wdg> > in the same way in which it has been defined “Time to Correct Inventory”.

3.12 Definire the variable “Production”

Variable “the Desired Inventory”, “Inventory” and “Time to Correct Inventory” defines the rate productivity “Production”. From the moment that these variable ones are all connected, the equation is defined that expresses “Production”:
(“Desired Inventory” - Inventory)/“Time to Correct Inventory”
Expression that goes inserted in the window of definition of the variable “Production”.
Figure 3.10- Window of definition of the variable “Production”

In this way they are passings i “?“relati you to the variable ones been involved in the previous expression. The unit of measure of “Production” will be < < wdg for time> >.

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