Start Date View
Usage
Using the
Start Date View
, you can define the periods of validity as well as the quantities and weightings for a restriction. As the conditions for the
characteristic values
you created for the restriction using the dependency editor can change over time, you can change the quantities and weightings.
Integration
When creating the restriction, you can specify the quantity and weighting in the
start date view
.If you want to change these values, for example, for one day or shift only, it is easier to maintain this data in the vertical period view . All changes in the vertical period view are immediately copied to the start date view.Using the
User Settings
, you can define whether you want the system to display thestart date view
only or whether you want to see both views.
Features
Start date and start shift
You define a start date and a start shift for each period of validity for the restriction. If you have specified a start date in the initial screen of the restriction maintenance, this date is proposed as the start date of the restriction. You can overwrite this date. The system determines the end date of the period automatically according to the start date of the next period of validity which you create in the next row. The start shifts are numbered on a daily basis – you can define a start shift between 1 and 3. If you do not use shifts, enter 1 as the start shift.
Reference shift
Using the reference shift, you can limit the validity of restrictions to one shift in a day only. This means, for example, that you can use different quantities to plan the night shift and the day shift.
NoteThe shift specifications in the start date view do not depend on the shift model you may have defined for the line resource. The system does not determine the shift program until Model Mix Planning as this can be changed in the short term. If, for example, you have defined a restriction with the third shift as a reference shift and the line only operates during two shifts, this restriction is not taken into account.
End of the note.Minimum/Maximum
The minimum and maximum quantities are dependent on the restriction category:
For a quantity restriction , you specify the number of times the characteristic value may occur at most/least per day or shift for each validity period.
For a position restriction , this specification refers to the position number within an order sequence (earliest and latest position).
For a K-in-M restriction , you specify the number within a certain partial sequence (interval).
For a block restriction, you specify the minimum or the maximum block size.
For a spacing restriction, you can only specify the minimum interval.
For the restriction category equal distribution , you cannot specify a minimum or a maximum as this restriction aims to evenly distribute the orders with the corresponding characteristic.
Hard and soft restrictions
In Model Mix Planning, the system always tries to respect all restrictions. However, the more orders and characteristics you have, the more difficult this becomes. Therefore, you can define hard and soft restrictions. That is, you can prioritize the restrictions. If you want to define a restriction as a hard restriction, enter “0” in the
Weighting
field. In Model Mix Planning, hard restrictions must be respected.If you want to define a restriction as a soft restriction, enter a value between 1 and 9 in the
Weighting
field. The highest weighting is1
and the lowest weighting is9
. If you define a weighting of9
, the probability of this restriction being respected is low. NoteNote that currently only the genetic algorithm and the LP Procedure can differentiate between hard and soft restrictions. The prioritized equal distribution procedure assumes that all selected restrictions are hard and the other two procedures do not take any restrictions into account at all.
End of the note.Inactive indicator
You can use this indicator to define that the restriction is not to be used by Model Mix Planning during the period specified in the row.