Range of Coverage Parameters

In an open-loop scenario, the CMC uses stock-based calculations (depending on the defined settings), which consider the range of coverage (ROC) for a component in an operation/order.

You can define up to three categories of ROC parameters for use by the automatic ROC calculation:

on FFF class level

Note Note

You must also maintain table TMCA (Evaluating Movement Types for LIS Update) with the corresponding entries to ensure that the system updates the consumption of FFF class parts. For more information about the required entries in this table, see Maintaining Table TMCA for CMC ROC Calculation .

End of the note.

on inventory group level
on CMC profile level

ROC parameters on FFF class level are the most detailed as they are on material level, ROC parameters on inventory group level are on plant level, and those on CMC profile level are general defaults. The system checks whether parameters exist on FFF class level first, if not it checks for parameters on inventory group level, and then in the CMC profile. The CMC uses the parameters defined in the CMC profile as defaults if you do not determine the parameters elsewhere. The parameters in the CMC profile are then valid for all components in the system. You define the same type of parameters in all three cases

You can use the functions of the Logistic Information System (LIS) to track the goods movements of rotable parts in consideration of the ROC parameter values.

Field Name

Description

(period indicator)

The unit of time used for the periods backward and forwards.

Caution Caution

The CMC only supports the value Daily .

End of the caution.

Per. Back

(periods backwards)

The number of periods in the past that the system checks for movements of the relevant component (FFF class, MPN-MRP set, material).

The CMC supports the calculation of a forecast ROC based on the current serviceable stock level, an (optional) target stock level, a period-based demand stream, and a stock level based on the amount of unserviceable stock currently undergoing repair and which will become serviceable within the required period. The result is a ROC in days.

The CMC performs a similar calculation for the forwards horizon, taking receipts from purchase orders, purchase requisitions, and work in progress (see below).

The CMC then compares the two results (backwards and forwards horizon) and uses the smaller value of the two to schedule the order.

Manual Determination of Backwards Horizon

You enter a value here. This method requires sophisticated manual analyses of historic values, because of the large variety of independent requirement patterns for individual rotable components.

Automatic Determination of Backwards Horizon

You trigger the report Time horizon to calculate the periods backward . You evaluate the results of this report and enter the determined value in this field.

Note Note

If no consumption exists for the component, the CMC uses the Target ROC value, if defined in the CMC Profile in Customizing.

End of the note.

Per. Fwd

(periods forward)

The number of periods in the future that the system checks for receipts of the relevant component (FFF class, MPN-MRP set, material). The receipts that it considers are purchase orders, purchase requisitions, and work in progress if they have been activated in the CMC profile.

The CMC compares the two results (backwards and forwards horizon) and uses the smaller value of the two to schedule the order.

You enter a value here that the system uses in determining the ROC.

Note Note

If no consumption exists for the component, the CMC uses the Target ROC value if it has been defined in the CMC profile in Customizing.

End of the note.

Max. TAT / Unit

(maximum turnaround time)

The maximum duration that an unserviceable component may remain in a work center.

Note Note

If you want to use max. TAT you must first maintain table TMCA (Evaluating movement types for LIS update) with the corresponding entries.

End of the note.

Target ROC

Target stock quantity used by the CMC in the ROC calculation.

The default setting used by the CMC is zero, meaning that the order is scheduled to end when there are no parts left in stock. However, you can set a target quantity here to ensure that the CMC schedules the order end date earlier

Max. Unsrv.

(maximum number of unserviceable parts)

The maximum amount of components in unserviceable condition that are allowed in the work center.

If the priority of the relevant component is based on unserviceable stock, the CMC uses the value entered here in the ROC calculation.

AutoSwitchQty

(minimum quantity for automatic switch of priority type)

If the stock-based priority is based on a comparison with the reorder point, the CMC changes the stock-based priority calculation automatically to a time-based priority calculation when the quantity of the relevant component falls below the value defined here.

This ensures improved scheduling and prioritization for components that have a low reorder point quantity.

Init. ROC

(initial ROC value)

If the ROC calculation returns a value of zero, the CMC replaces this ROC with the value defined in this field.

This is especially relevant for new components and the like where no consumption has taken place.

CMC Inventory Groups

CMC Profiles

ROC Calculations