Calculating the Resource Consumptions of an Activity

Use

The resource consumption of an activityis the capacity of the resource that is necessary to carry out the activity.

Example Example

An furnace has a capacity of 1000 pc. The resource consumption of a tempering activity carried out in this furnace is variable and can amount to between 1 and 1000 pc, depending on the quantity to be produced.

End of the example.

Because different resources may be necessary to carry out an activity, which are then simultaneously taken up by this activity, the activity can thus be responsible for several resource consumptions (one for each resource in the mode ).

The resource consumption of an activity can have a fixed portion (which is independent of the order quantity) and a variable portion (which is quantity-dependent). A quantity-dependent portion is only allowed in the case of multiresources:

Single-activity resourcesand single-mixed resourcescan only be taken up by one activity at any one time. Here the resource consumption is quantity-independent, equal to 1 and corresponds to the capacity of these resources. In the case of single resources, there is a quantity dependency for the net duration of an activity only.
Multiactivity resourcesand multimixed resourcescan process several activities simultaneously. The resource consumption can consist of a fixed and a variable portion. A variable resource consumption is only allowed in the case of a quantity-independent net duration.

In the case of multiresources, the resource consumption can exceed the capacity of the resource (in the event of large order quantities, for example). As standard procedure, the system reduces the resource consumption to the value of the standard capacity in this case, and increases the net duration of the activity accordingly. If the resource consumption is twice as large as the standard capacity of the resource, for example, the system doubles the net duration of the activity. If you have not specified a standard capacity in the resource, resource consumption and net duration retain their original values. The activity cannot therefore be scheduled.

For an overview of the possible values for capacity and resource consumption for PP/DS resource types, see Capacity and Resource Consumption for PP/DS Resource Types .

The system calculates the resource consumptions of an activity using the following formula:

Resource consumption =

fixed consumption + (variable consumption x order quantity/output quantity)

The data used in the calculation is described in the following table.

Data for calculating resource consumption

Data	Description
Output quantity	Base quantity of the primary order product You assigned the primary order product to an activity as the output product. You specify the base quantity here.
Fixed resource consumption	Capacity of the resource that is used for the activity, irrespective of the produced quantity
Variable resource consumption	Capacity of the resource used to produce the output quantity of the primary order product (without fixed consumption)

Data

Description

Output quantity

Base quantity of the primary order product

You assigned the primary order product to an activity as the output product. You specify the base quantity here.

Fixed resource consumption

Capacity of the resource that is used for the activity, irrespective of the produced quantity

Variable resource consumption

Capacity of the resource used to produce the output quantity of the primary order product (without fixed consumption)

Note Note

The quantity produced by an activity may vary from the order quantity: If scrap is incurred, the activity must produce a correspondingly larger quantity. In the case of quantity-dependent resource consumption, the resource consumption of the activity also increases as a result.

End of the note.

Integration

Net duration and resource consumptions define the capacity requirements of the activity.

Prerequisites

You have specified the above data for the activity in the source of supplyfor in-house production.