Discrete Scheduling
When you define a job, you must enter either a start or completion date and time. If the job assembly has a routing, dates and times are automatically scheduled for the operations, resources, and material requirements for the job using detailed scheduling.
If the job assembly does not have a routing, it can be scheduled in one of two ways. You can manually schedule the jobs by entering both the start and completion dates. You can also enter either a start or completion date and allow the system to calculate the missing date based on the item lead time.
Start Date
This is the date and time that you plan to start the job. You can choose start dates and times earlier than the current date to maintain relative date priorities for department schedules and material requirements. You can choose start dates that are not on the manufacturing calendar. In this case, the system plans for work to start on the next valid date.
When you specify the start date and time, the system forward schedules the job and automatically calculates the job completion date and time using detailed scheduling based on the assembly's routing. If no routing exists, the system forward schedules using the fixed and variable lead times for the assembly from the item master. If no routing and no lead time exist, you must enter both the start and completion dates.
Completion Date
This is the date and time on which you plan to complete the job. You can choose completion dates and times earlier than the current date to maintain relative date priorities for department schedules and material requirements. If you choose completion dates that are not on the manufacturing calendar, the system plans for work to complete on the next valid date.
When you specify the job completion date and time, the system backward schedules the job and automatically calculates the job start date and time using detailed scheduling based on the assembly's routing. If no routing exists, the system backward schedules using the fixed and variable lead times for the assembly from the item master. If no routing and no lead time exist, you must enter both the start and completion dates.
When you import jobs and schedules or automatically create discrete jobs from planned orders, the system uses the due date from the planned order as the scheduled completion date and uses backward scheduling to determine the start date. When the system automatically creates final assembly orders, it also uses backward scheduling from the order due date to determine the job start date.
Attention: The start date that Oracle Master Scheduling/MRP and Supply Chain Planning recommends may not exactly match with the start date of the actual job. Differences between the planning and work in process lead times can arise due to more precise scheduling of shifts and resources by Work in Process.
Operations Dates
Each operation in the routing is scheduled using detailed scheduling. The start date and time of the first operation generally equals the start date and time for the job. The scheduled completion date and time for the job generally equals the scheduled completion date and time of the last operation in the routing. If the resource is not active on a shift at the start or completion dates and times of the job, the first and last operation dates and times do not match the start and completion dates of the job. In addition, you can manually schedule the first and last operation dates and times to differ from the job start and completion dates and times.
Material Requirements Dates
The system schedules material requirements so that they are required on the start date and time of the operation where they are consumed. For example, if you use component A in operation sequence 30 and operation sequence 30 is scheduled to start on 01-JAN at 12:15, then the component is required on 01-JAN at 12:15 regardless of the start and completion dates and times of the job. If there is no routing, all material requirements are required on the job start date and time.
See Also
Detailed Scheduling
Discrete Rescheduling
Rescheduling Discrete Jobs
Importing Jobs and Schedules
Final Assembly Orders
Planned Discrete Jobs
