Planning Groups Planning GroupsThe concept of planning group aims at making it possible to launch the requirements calculation (and the conversion to firm work orders) for all the items according to their level in the BOM. In this way, it is possible to fix a production plan for the upper item levels. Then the production plan for the lower item levels is computed, as a function of the first upper level items plan, which is considered as fixed. In this way, the computation of new orders (and thus production plans) for all the items, each time a MRP procedure is launched, is unnecessary.
When one specifies a planning group for an item (between 0 and 8), its low level code is fixed at least at ten times the group number. For example, if one places an item in the planning group 2, its low level code will be greater or equal to 20. If this article has components, their low level codes will be 21, 22, etc...
If one modifies the planning group of one or more articles, it is necessary to launch the Low Level Code Calculation function (Technical Data menu) again.
In the requirements calculation, it is possible to launch the procedure only for some groups and it is likewise for converting planned work orders into firm work orders.
The lead-time is equal to the time-period between the release date of a work order (also called the date of the order) and the date of the item’s availability.
For manufactured items, this lead-time is equal to the normal manufacturing cycle time of the item. The planned release date will be equal to the requirement date minus the number of days corresponding to the lead-time.
For the purchased items, this lead-time is equal to the delivery vendor lead-time. The planned order date will be equal to the requirement date minus the number of days of the lead-time.
The offset calculation only takes into account working days of the plant, which are given in the plant calendar (PC).
The requirements in components will be adjusted to the planned release date unless one enters a non-zero offset in the bill of material (see the Product structure record window, Engineering menu).
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Cumulative Lead-time: |
This is the number of days required to produce the item when no component or raw material is available. The total cycle time of each item is determined by cumulating the delays of all the components involved in the production of the item as well as the lead-time of the item itself. It is computed by the Low Level Code Calculation function (Engineering menu). |
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Time Fence: |
This is the number of days required to produce the item when taking into account that some components or raw materials are available in inventory. The time fence is calculated by cumulating the delays of the components managed by requirement and the delay of the item itself. It is calculated by the Low Level Code Calculation function (Engineering menu). |