| Workload control, to compute planning prioritiesIf the desired production
volume for a plan period exceeds the capacity or material constraints, LN must make a selection.
Some plan items can be planned immediately. The rest must be moved to the next
or the preceding plan period. This selection is based
upon the following planning data and item data: Planning data: - Production volume
- Volume moved
- Numbers of periods moved
Item data: - Total material costs
- Production costs
- Item priority
Item data can be defined
in the Items - Planning (cprpd1100m000) session. You can change the
planning priority calculation in the Work Load Control Parameters (cpwlc2101m000) session. The effects of the fields in that
session are demonstrated in the Workload control, a detailed example topic. Priority Level A priority level is calculated for each plan item. Three
different approaches are available. The priority level can be based on: - Planning data, such
as the production volume
- Predefined item
priorities (such as high, medium, low)
- A combination of
planning data and item priorities
Determine this by
setting the Consider Item Priority field. Planning data If the Consider Item Priority field is No, the
priority level is based on planning data such as the production volume. The priority level is
calculated according to the following method: Backward/forward planning rules First, the priority level is set to one of the following: - Production Volume The production volume is the quantity to be produced in a plan
period.
- Volume Moved The volume moved is the production volume that has been moved to
another plan period.
- Number of Periods Moved The number of periods that a certain production volume
has been moved backward or forward.
- Volume and Periods Moved The Volume and periods moved is defined as:
Volume moved * Number of periods moved Separate rules for
the backward and forward planning steps can be defined in the Backward Plan. Rule and Forward Plan Rule fields. Material and Production Costs The priority level
that was determined in the previous step, can be adjusted by multiplying it by
the material or production costs of the plan item. This is determined by the Consider Material Costs or Consider Production Costs in the Work Load Control Parameters (cpwlc2101m000) session. Predefined item priorities If the Consider Item Priority field is set to Only, the
priority level is based on predefined item priorities. Item priorities can be
low, medium, high, and so on. The priority of each plan item is recorded in the Priority field in the Items - Planning (cprpd1100m000) session. Combination of planning data and item
priorities If the Consider Item Priority field is Yes, the
priority level is based on a combination of planning data and predefined item
priorities. The priority level
is subsequently multiplied by a priority factor which reflects the relative
importance of a plan item. The priority factor is based on the following table:
Priority | Priority Factor |
---|
Highest | 1.8 | Very high | 1.6 | Higher | 1.4 | High | 1.2 | Medium | 1 | Low | 0.8 | Lower | 0.6 | Very Low | 0.4 | Lowest | 0.2 |
The priority of an item
is recorded in the Priority field in the Items - Planning (cprpd1100m000) session. Note The unit of measure is
not considered in the criterion of production volume. If the plan items are
measured in a number of different units, such as piece, kg, or liter, the
production volume is not a suitable criterion. In that case, it is better to
use the financial value of the production volume. Do this by selecting the Consider Material Costs or Priority check boxes. If the planning rules
result in the same priority level for two items, the item with the highest
production volume is planned first. | |