Summary Attributes

For each lot, the system calculates lot summary attributes from the definition that you set up for the branch/plant. When a new lot is created, the system calculates the lot summary attributes from the definition that was set up for the blend facility.

Based on the source of the lot summary attributes, the value needs to be assigned to the lot in one of these ways:

• Calculated

• Selected

The final step in calculating the properties of the lot is to build the summary attributes. This step is the last because most of the summary attributes are derivations of the other lot entities.

The system determines the blending rule only for the instructed lot summary attributes from the configuration of the lot summary attribute.

The system performs calculations based on these blending rules:

• Use Largest Value

  Locate the largest value for a particular attribute from all the lots that are being blended. Use the largest value for the attribute of the new lot.

• Use Smallest Value

  Locate the smallest value for a particular attribute from all the lots that are being blended. Use the smallest value for the attribute of the new lot.

• Use Average Value

  Use the weighted average value of the attribute for all blended lots. The weighted average is based on quantity (volume or weight).

• No Calculation

  Do not derive a new value for this summary attribute. This summary attribute is blank after a blending operation.

• Equal Only

  The resulting lot is set only if the value of all the contributing lots is equal; otherwise, it is blank.

• Use Largest Lot

  Use the value from the largest lot involved in the blend.

The system checks the configuration of the lot summary attribute for Threshold Percent. If a threshold exists, the system applies the Threshold Percent to the calculation. This value defines the smallest lot to include in the calculations. For instance, when adding a small amount of bulk material to a large container, you may want to ignore the smaller lot rather than blend the attributes.

The system checks the lot summary attribute configuration for the Blank Value Handling method. If the value for one or more of the lots is blank, the blank value is treated in one of these ways:

• Treat blank values as 0.

• Ignore blank values.

  This lot would be excluded just as in the preceding minimum threshold.

• Don't calculate.

  Don't calculate a value if any of the blended lots has a blank value for this attribute.

These rule values need to be assigned to the lot summary attributes during setup.

For each summary attribute, the system displays the description that you set up in the Summary Attribute Definition program (P31B40). If you did not enter a description for a summary attribute, the system displays the default label Summary Attribute {number}.