Position Restriction
Definition
You can use position restriction to limit the occurrence of a certain characteristic to a certain position or partial sequence. If you want to define a characteristic for a certain partial sequence, you must specify the position 1 as the minimum value and position 5 as the maximum value, for example, in restriction processing. In this case, the system must then also schedule five orders with the desired characteristic one after the other at the positions 1 to 5 during the optimization process.If the system does not manage to do this, optimization with the genetic algorithm will lead to penalty costs.
Example
The Research & Development department wants to test 6 prototypes in production. For this purpose, the development engineers are going to visit the production line at 10.00 am to monitor the production of the prototype. Therefore, you define a position restriction for the following object dependency:
Prototype22 = 'Yes”
You define the following validity and weighting for the restriction in the start date view:
The first validity period for the restriction starts on the 1 st June 2006 in the first shift. Using the second validity period, the system calculated that the end of the first validity period is the first shift on the 1 st June 2006. The inactive indicator shows that the restriction is no longer valid in the second validity period and is therefore no longer to be used in planning.
The vehicles are to be assigned the sequence numbers 100 to 105 in the sequence for the day.
The restriction has been defined as hard because the engineers can only be at the production line during this time.