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APO-PPS-EVA: WIP Evaluation in Continuous Material Transfer ( RELNAPO_30A_SP4_PPS_WIP )

APO-PPS-EVA: WIP Evaluation in Continuous Material Transfer ( RELNAPO_30A_SP4_PPS_WIP )

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APO-PPS-EVA: WIP Evaluation in Continuous Material Transfer

Use

As of Release 3.0A (First Customer Shipment and Support Package 4), the system also calculates the work-in-process (WIP) data for operations that produce or consume material at a constant rate (operations with continuous output or input) in the enhanced view of the evaluations of WIP stock. You use this data to analyze the WIP stock

The following will show you how the system calculates WIP data for the most simple case, in which the entire material quantity required and consumed in an operation is continuously supplied in exactly one operation. The system uses the following data for the calculations:

  • The total quantity transferred
  • The start and end dates for the material transfer (production operation)
The system uses these dates and the total quantity to determine the development of the transferred material quantity over time, in other words the entire quantity which the operation has produced according to schedule until a certain point in time and transferred to the consumption operation. Before the transfer has started, the transferred quantity is zero, since the operation has not yet transferred any material. The transferred quantity increases evenly between the start and end date until it has reached the total quantity. (The system assumes that the operation is also continuously transferring material in non-working time.) By the end date, the operation has transferred the total quantity. As of this point in time, the total transferred quantity is equal to the total quantity.
  • Start and end of material consumption (consumption operation)

The system uses these dates and the total quantity to determine the development of the consumed material quantity over time, in other words the entire quantity which the operation has consumed according to schedule. Before the consumption has started, the consumed quantity is zero, since the operation has not yet consumed any material. The consumed quantity increases evenly between the start and end date until it has reached the total quantity. (The system assumes that the operation is also continuously consuming material in non-working time.) By the end date, the operation has consumed the total quantity. As of this point in time, the total consumed quantity is equal to the total quantity.

The system determines the WIP curve using the time details of the transferred and consumed quantity. The WIP curve shows the difference between the total transferred quantity and the total consumed quantity for any point on the timeline. The shape of the curve depends on

  • the rate at which the quantities are transferred or consumed
  • the relative point in time of the transfer and consumption dates.

The curve values can be positive or negative. Positive values show that material has been supplied but not yet processed. Negative values indicate a lack of material. This can happen, for example, if the consumption operation needs material sooner or consumes material faster than the production operation can supply it. Negative value are also a sign of inconsistent planning.

The system shows the following data in the WIP evaluation:

  • WIP area
The WIP area is the area underneath the WIP curve. It is the total quantity that the operation transfers to another operation.
  • WIP time
The WIP time is the result of the WIP area divided by the total quantity
  • Maximum value of the WIP curve
  • Minimum value of the WIP curve

The system calculates the WIP data in general in a similar way if more than one continuously producing or consuming operation participate in the material flow. However, in this case the system divides the WIP data in partial quantities accordingly, each of these quantities flowing between a production operation and consumption operation. We differentiate between the following instances:

  • A production operation supplies to several consumption operations.
The system assumes that the production operation delivers first to the consumption operation that has the earliest start date for material consumption. Once this operation has received the required quantity of material, the production operation supplies material to the next consumption operation, and so on.
  • Several production operations supply to one consumption operation.
The system assumes that the consumption operation first consumes the material of the production operation that has the earliest start date for material transfer. Once this material is consumed, the consumption operation consumes the material supplied by the next production operation, and so on.

In the WIP evaluation, the WIP data refer, in these instances, to the partial quantity of the material that is transferred from a production operation to a consumption operation. The WIP times are determined by the partial quantities and the completion or requirement dates of the partial quantities.

Effects on Existing Data

Effects on Data Transfer

Effects on System Administration

Effects on Customizing

Further Information






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