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Logics specific to production scheduling

Bi-directional scheduling

Changeover for specification change

Concerning products with several complex specification such as color, shape, width, lenght , etc., changeover tasks vary depending on combination of the specs. In order to calculate task time, PlanWizard takes into account relatinoship between preceding / following specs.

By utilizing wieight factors, users are able to prioritize machines for assignment. This feature is useful when there are several candidates of machines for a single product/ step. Evaluation is performed based on results of several temporary assignment (back tracking), which brings about accurate solution.

Dialog box for setting weight factor
dialog box for setting weight factor

PlanWizard generates schedules in both backward or forward direction or in combined directions. In the backward scheduling , orders are assigned just before their due dates. This type of schedule reduces inventory. However it is inconvenient in this case that operations do not start at the beginning of morning shift. Bi-directional scheduling feature of PW solves this problem. In addition, this function solves past assignment problem caused by backward scheduling. This feature is very convenient for practical scheduling purposes.

Scheduling result with barckward direction (Due dates are set as June 4 th)
Since more than 48 hours passes after the completion of production of Order01, washing is automatically inserted .
Color
White Yellow Green Black
White 00:00 01:00 02:00 03:00
Yellow 02:00 00:00 01:00 02:00
Green 04:00 02:00 00:00 01:00
Black 06:00 04:00 02:00 00:00
Size
Large Small
Large 00:00 00:30
Small 00:30 00:00
Shape
Circle Triangle Square
Circle 00:00 01:00 02:00
Triangle 01:00 00:00 01:00
Square 02:00 01:00 00:00

Assignment with weight factor

Assignment with maximum and minimum limits in the loading capacity of facilities
When there are limits to the minimum as well as maximum loading amount to facilities such as vessels or storage tanks, PlanWizard is able to automatically select available facilities and assigns orders to right facilities.
Assignment so that orders meet high and low capacity requirements of facilities
.

All the orders are assigned to proper tankas. The selection and assignment are automatically carried out based on initial settings.

Assignment without consideration of capacity limits of tanks ( Unfeasible plan)

Some of the orders are overloaded. Order amount and tank capacity are note taken into consideration.

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