Rough capacity consumption in PCS

Backgrounds on activities and network planning

In PCS, you can define activities. An activity represents a stage in the execution of a project, for example, engineering, production, final assembly, or inspection. After defining activities, you must define activity relationships to indicate dependencies between the activities. You can use activities and activity relationships to perform a network planning to represent an overal planning of the PCS project.

If you define an activity in the Activities (tipcs4101m000) session, you must enter a work center for the activity. You must enter the number of hours that represent the work center's rough capacity requirements. After you perform network planning, you can view the work center's capacity in the Resource Order Plan (cprrp0530m000) session, or the Resource Master Plan (cprmp3501m000) session. The rough capacity requirements from the Activities (tipcs4101m000) session is expressed by the Capacity Used for PCS Activities field. The work center's Free Capacity is calculated by subtracting the Capacity Used for PCS Activities from the Available Capacity.

If an activity involves production, JSC production orders and/or planned production in Enterprise Planning are present. Capacity on a work center is demanded by the activity and by the production orders. If the work center on the production order(s) is the same as the work center defined on the activity, double consumption of work center capacity can occur. In the Resource Order Plan (cprrp0530m000) session or the Resource Master Plan (cprmp3501m000) session you can view the required JSC capacity in the Capacity Used for Production Orders field as well as the rough capacity in the Capacity Used for PCS Activities field. With double consumption, the Available Capacity of the work center is reduced by both the Capacity Used for Production Orders and the Capacity Used for PCS Activities.

Usage of the Use rough PCS capacity requirement check box

Double consumption of work center capacity is not always desirable. Using the Use rough PCS capacity requirement check box in the Work Centers (tirou0101m000) session prevents this:

• If the Use rough PCS capacity requirement check box is selected, the PCS rough capacity defined for activities in PCS, and the capacity required for JSC production orders and planned production orders in Enterprise Planning are subtracted from the work center's available capacity. Therefore, double consumption of work center capacity occurs.
• If the Use rough PCS capacity requirement check box is cleared, the work center's available capacity is consumed by the capacity required for the JSC production orders and planned production orders in Enterprise Planning. The rough capacity requirements defined in the Activities (tipcs4101m000) session are not taken into account.