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what is forward and backward shedule in planning

what is forward and backward shedule in planning ?

and make to order

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  • author's profile photo Former Member
    Former Member
    Posted on Jul 31, 2008 at 06:51 AM

    Backward scheduling is the calculation of deadline dates: the arrival time at the customer site is calculated as the earliest possible goods receipt time at the customers unloading point on the requested delivery date. All four of the delivery and transportation scheduling lead times are subtracted from the customer's requested delivery date to determine if this date can be met.

    The transit time, loading time, and pick/pack time are subtracted from the customeru2019s requested delivery date to calculate the required material availability date.

    The system calculates backward scheduling as follows:

    Requested delivery date minus transit time = Goods issue date

    Goods issue date minus loading time = Loading date

    Loading date minus transportation lead time = Transportation scheduling date

    Loading date minus pick/pack time = Material availability date

    By default, the system will calculate delivery dates the closest day, taking into consideration the working days of the shipping point and a rounding profile. In this case the system assumes a 24 hour work day and lead times can be entered in days up to 2 decimal points. This is referred to as daily scheduling.

    Precise scheduling calculated down to the day, hour and minute is supported. This allows the scheduling of a delivery within a single day. It is activated by maintaining the working hours for a particular shipping point.

    Backward scheduling is always carried out first. If the material availability date or transportation scheduling date is calculated to be in the past, the system must then use forward scheduling.

    Forward scheduling is also done if no product is available on the material availability date calculated by backward scheduling. The system does an availability check to determine the first possible date when product will be available. This new material availability date forms the starting point for scheduling the remaining activities. The loading time, pick/pack time, transit time, and transportation lead time are added to the new material availability date to calculate the confirmed delivery date.

    Regards,

    Arpit

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  • author's profile photo Former Member
    Former Member
    Posted on Jul 31, 2008 at 08:35 AM

    Hi,

    Backward scheduling is always carried out for both delivery scheduling and transportation scheduling. If backward scheduling determines a material-availability deadline or transportation-scheduling deadline that lies in the past, the system automatically carries out forward scheduling to determine a delivery deadline that can be confirmed.

    Backward Scheduling

    The system first carries out backward scheduling from the requested delivery deadline:

    Requested delivery deadline

    ./. minus transit time

    -


    Goods issue deadline

    Goods issue deadline

    ./. minus loading time

    -


    Loading deadline

    Based on the loading deadline, the system determines two further dates, the transportation planning deadline and the material availability deadline.

    Loading deadline

    ./. minus transportation lead time

    -


    Transportation scheduling deadline

    Loading deadline

    ./. minus pick/pack time

    -


    Material availability deadline

    The earlier of these last two dates (material availability deadline and transportation scheduling deadline) determines when a schedule line becomes due for shipping.

    Forward Scheduling

    If backward scheduling determines a date in the past as the date on which a schedule line becomes due for shipping or if the material will not be available on the date calculated, the system automatically carries out forward scheduling to determine the earliest possible shipping deadline.

    For example, starting from the current date, the system calculates the loading deadline, the goods issue deadline, and then the confirmed delivery date. It does this by adding together the shipping times mentioned above

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    regards

    sadhu kishore

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