Different operation types are available:
The duration of the operation is constant, regardless of the quantity being planned.
A typical example is a transport operation: transporting 1 piece with a truck takes just as long as transporting 100 pieces.
The duration of the operation increases linearly with the planned quantity. The total duration takes the form of ‘A + B * quantity’, where A and B are constants.
A typical example is a production operation: there is a fixed overhead of machine setup at the start, and the actual production is linear with the quantity to produce.
This operation type plans the demand proportionally over a number of operations, based on pre-defined percentages.
This operation type represent the sequence of operations that need to be run in sequence.
AlternateThis operation type represent the choice between alternate operations to achieve the same result. Another cookbook recipe is dedicated to this.In the majority of models you don’t have to explicitly use alternate operations in your model. FrePPLe will automatically create them as soon as there are multiple replenishment methods.
The duration for the operation refers to available time. If the operation location has a calendar with the working hours and holidays, the time between the start and end date of an operationplan can be longer than the duration defined on the operation.
This example has a transport operation of type fixed_time and a production operation of type time_per.