Scheduling data comprises entries that the system requires to calculate the start and finish times for an order, an operation or a material.
The scheduling data is distinguished in the following ways:
Basic Dates for the Order
The basic dates belong to the header data for an order. The scheduling of operations is calculated from the basic dates. If no relationships are used, then operations are executed in sequence according to their operation number. For example, the operation with operation number 020 is executed after the operation with operation number 010.
The basic dates of the operations for an order determine the sequence in which the operations are scheduled by the system.
Scheduling Type for the Order
The scheduling type determines the way scheduling is calculated. It is defined for each order type by your system administration in Customizing, and is proposed automatically when an order is created. The scheduling type can be changed.
Scheduling Types
The following scheduling types can be distinguished:
Forward scheduling
Entry of basic date: Start date (with or without time)
The execution of the order should start at this time.
Backward scheduling
Entry of basic date: End date (with or without time)
The execution of the order should be completed at this time.
Scheduling for the current date
Entry of basic dates: Start and end date
The order should be executed on the current day.
No scheduling
Entry of basic dates: None
Performing Work Center
The data from the master record for the performing work center determines the extent to which scheduling of operations is dependent on the shift system.
Data relevant to scheduling is stored as a formula in the master data for the work center.
Execution Duration
The execution duration determines how much time is required to execute an operation. Each operation that you want to include in scheduling must have an execution duration, according to the formula in the work center.
Example: Automatic Calculation
Activity |
Entry |
You enter the activity type for the operation in the
|
pm-h |
You enter the time required to execute the operation in the
|
12 h |
You enter the number of people who are to perform the work in the
|
3 |
You enter the proportion of working time that the people can use to execute the operation as a percentage in the
|
100 |
You specify the key for calculating the execution duration in the
|
1 |
You choose
|
4 h |
This entry method is suitable if the entries in the
Number
and
Normal duration
fields are inversely proportional to one another:
Work
:
Number
=
Normal duration
Example: Manual Entry
Activity |
Entry |
You enter the activity type for the operation in the
|
pm-h |
You enter the execution duration in the
|
4 h |
This entry method is suitable if the number of people and the duration are not in any proportional relationship to one another.
Control Key with Scheduling Indicator for Each Operation
The control key determines whether or not an operation should be included in scheduling.
Operations, to which a control key has been assigned without a scheduling indicator, are automatically excluded for scheduling purposes.
You have the following options for external operations :
You can enter a control key for external processing which includes the operation based on the duration specified for it in order scheduling. This results in the dates for the subsequent operations being scheduled with reference to the duration of the external operation. For this control key, the
Scheduling external operation with standard values
parameter must be maintained. You maintain the operation duration in the operation overview.
You can enter a control key for external processing, for which the
Scheduling external operation with standard values
parameter is
not
maintained. This results in the operation end date being defined in days based on the planned delivery time entered. The dates for the subsequent operations are then determined with reference to this operation end date.
Scheduling Restrictions
The scheduling restrictions determine the timeframe within which the operation should be executed.
Lead Times and Lead-Time Offsets for Material
If you want to define when a material should be available in relation to the start date of an operation, you have the following entry options on the component detail screen in the
Time interval
field under
General data
:
Enter a negative value, to define the length of the lead time.
Enter a positive value, to define the length of the lead time offset.