Production > Capacity planning > APS calculation types - robinfeng/beashelp GitHub Wiki

APS 计算类型

Navigation: Production > Capacity Planning: APS Calculation Types No contents entries on this page Contents Any calculation methods can be defined in APS. They can also represent entire batch functions. Several default calculation methods are supplied. see Default Calculation Methods.

Under: Production / Capacity planning / Calculation types If so, it can be defined here. In the planning settings (Production / APS / Edit plan) you can configure which calculation method is available in this plan. If a new calculation method is defined, you must remember to store this in the planning also.

A calculation method has the following structure

  • Master data (basic setting)
    • Calculation steps 1...x
  • Use

To facilitate configuration, the setting is specified using a wizard. The settings are well documented there and can generally be made without documentation.

Master data Calculation method Unique ID Description Description of work sequence Time reservation hmtoggle_plus1 Processing time reservations Delete all: All time reservations are deleted before calculation – including those from non-visible and previously planned work orders. The new word orders to be dispatched are then available to all resources. CAUTION: All other orders that are not recalculated then no longer have any times reserved. EXCEPTION: the resources of fixed positions are not removed. Only delete from affected orders: This option normally makes more sense. Only the resources of orders that are recalculated are removed. This ensures that the resources of previously planned orders are retained. EXCEPTION: the resources of fixed positions are not removed. No action: Time reservations are not removed, as a result of which the times cannot be calculated optimally or by priority.

Reset start date If activated, the planned start date is set to the current date before calculation. The earliest possible start for a production structure is then calculated. Calculate only unscheduled If activated, only the unplanned work orders are scheduled. However, any activated material control and reservation is also carried out for the planned work orders. Recommended setting: Activate. Work orders, which are marked for calculation, but due to this option are not calculated, receive the value "fixed" in field "last calculation" Material Control hmtoggle_plus1 Type of material check A material check can be activated which reserves the material stock or all planned accesses for the work orders by priority (soft reservation)

A copy of the warehouse stock of goods issues is created and these are then assigned to the work orders by priority (sorting of the production list). If no planned issue is available, a possible issue is used: today + lead time of the item in question.

Note: The material check is only performed if the calculation is started in APS view (List). For a material check, the entire production must always be seen, and the previously planned work orders must be considered. For this reason, it is important that all work orders planned and to be planned are displayed in the list, and that the previously planned work orders are at the start of the list. For this reason, during the material check the "Only calculate unplanned" option is ignored for the material check itself.

Only items with positive stock inventories, which are not blocked and are released from beas side, are taken into account.

If material is unavailable for a work order, this is displayed in the Gantt chart using a symbol. The missing material and the planned receipts can also be displayed in the list display and the Gantt chart.

After scheduling *1 In material calculation after scheduling, the latest possible material receipt is calculated. Material is only not okay if the previously calculated start date of the position cannot be fulfilled.

Before scheduling *2 In material calculation before scheduling, the earliest possible material receipt is calculated irrespective of the required date and this is entered as the earliest material receipt in the position.

If "Consider material entry" is activated in the calculation step, the material entry determined here is considered and the operation is only started if the material is available. This only works for forward scheduling.

If the missing material is an assembly (non-order-related) and there is already a work order, this assembly and this word order has a lower priority according to APS - View - Production List, the priority is changed automatically, i.e. the work order is moved up in the list. If "Consider material entry" is activated in the calculation step, this ensures that the sub-assemblies are always scheduled before the higher-level assemblies.

Pre- and post-scheduling Under certain circumstances, it may be logical to activate both variants. Important: the "earliest possible start date" information is overwritten in the operation with "latest possible". Notes on material control: The reservation system and Receipt reservations are currently not taken into account in APS. Order-related assembly BOM items are completely ignored, because it is assumed, that the associated manufacturing position exists in the same amount. Material requirement coverage is tested as follows:

  • Stock available?
  • Planned production receipt existing ? (* 2)

Stock allocation

a) Reservation (as early as possible, for material allocation before dispatching)

  • Stock available?
  • Inventory allocation?
  • Earliest production receipt ? (* 1)
  • Earliest purchase order ? (* 1)
  • Earliest replenishment date ? (* 1)

b) Reservations (late as possible, for material control after dispatching)

  • Stock sufficient?
  • Latest possible production receipt, completed before the requirement date
  • Latest possible purchase order receipt
  • Inventory allocation?
  • Earliest production receipt - possibly at a later date? (* 1)
  • Earliest purchase receipt - possibly at a later date? (* 1)
  • Earliest replenishment date ? (* 1)

(* 1) Special features of this calculation steps: In "Material check after scheduling" "too late" is active, if the planned receipt is after the requirement date. The requirement date is the calculated completion date or the start date of the assigned work order. The assigned here planned receipts are assigned to the position and can be represented in the GSP list. (* 2) Only with "material check before scheduling" If a work order is determined, it is first scheduled. This ensures that the work order is finished earlier and can cover the requirements as soon as possible.

Calculation steps Any number of calculation steps can be defined.

Calculation step Unique ID Sort Sequence Description Description of calculation step Scheduling hmtoggle_plus1 Determines the calculation method or direction Backwards Backward from delivery date, material-optimized. Fixed operation specifications are not considered. Forward Forward from start date, resource-optimized. Catch Up Forward from present, only operations in the past and overlaps are moved. Idle time, transit time and fixed operation specifications are not considered for the work sequences in question.

Execution condition hmtoggle_plus1 Defines the condition under which this calculation step should be executed. always Is always executed Date > Delivery date Only if the calculated end date is after the delivery date Date < Start date Only if the calculated start date is before the stored start date or in the past. This system can be used to perform e.g. a re-allocation:

  1. Step 1: Calculation using default (forward)
  2. Step 1 and following: Reduce transit times, increase overload and calculate again, and try to adhere to the delivery date in this way.

Consider planning flag If you do not filter out planned production orders in the planning view, you can also define the use of the planning flag using the calculation step. Delete Any flag set is removed and calculation is performed Do not calculate No calculation is performed Calculate and set A calculation is performed and the flag is always set afterwards. Fixed operation specification Defines the use of fixed operation specifications Delete all All fixed specifications are removed on calculation Delete incorrect only Fixed specifications that are in the past are removed. Fixed specifications that produce a date overlap are not removed. Consider material entry If this is activated, the receipt date calculated from the material control is used at the earliest start date for the affected positions. However this does not affect fixed positions. Simulation If activated, the calculated times are NOT reserved or written to the reservation table and visualization table. In this method, only the start or end date is calculated. Observe capacity limits hmtoggle_plus1 Determine, whether to take into account resource limits

active: a resource, where the option "observe capacity limits" was enabled, will never be dispatched with more than 100%. All time reservations are considered, even work roders which are not calculated currently.

Exceptions:

  • operation are fixed manually in APS
  • in resource "observe capacity limits" was disabled
  • Priority was set to more than 100%
  • Setting "Overlapping limit" in the calculation type was set to more than 100%

inactive: Resource limits are not considered. Calculating work orders, time reservations of other work orders are not taken into account.

Consideration of time receipts hmtoggle_plus1 Determines whether time or goods movements should be considered when calculating the remaining time requirement. reported times The previously reported times are deducted from the planned time and used for further calculation. Reported quantity The proportional time of the reported quantities (quantity specifications via the time reports) are deducted from the planned time and used for further calculation Not considered The planned time is always used for calculation - independently of the previously reported times or quantities.

Exploit capacities fully If this is active, the resources are fully utilized. However, a position may also be "split", as even the smallest windows of free time are then used. In the case of a multiple machine resource, if the overload limits are greater than 100% or if resource limits are not taken into account, beas automatically switches the affected position to "Utilize capacity fully". If this option is deactivated (default), detailed planning to the minute is performed and positions are not split. If a sufficiently large time window is not found, the throughput can also be extended if there is less than 100% resource utilization. Transit time in % Specifies the % of transit time to be considered. Default: Stored priority setting according to the production order A free % value can be entered. The lower the value, the lower the throughput time Overload limits in % Specifies the % to which the resource may be overloaded. Example: if the resource has a planned capacity of 8 hours / day and 150% is set, the order can schedule this resource for 12 hours. Default: Stored priority setting according to the production order A free % value can be entered. The greater the value, the lower the throughput time External operation:consider goods receipt from PO If this option is enabled, it has influence on the finishing date of the external operation. The following rules apply:

  • If there is no purchase: the finishing date is calculated based on the deposited job times (if time calculation is active). Then, the idle period is added. Note: idle time is often used for calculating the lead time.
  • If there is one open purchase: finishing date is delivery date+ time of day as per calculation setting. Idle time is ignored (see above)
  • If there are several open purchases: finishing date is delivery date+time of the first purchase + time as in calculation settings.
  • If start date of the operation is after delivery date: , then the finishing date is the same as start date of the operation (0 processing time) idle time is set to 0. Only transit time is taken into account. External operation: time of inflow Because at purchase only the date but not the time can be entered, a general time (standard: 3 pm (15:00)) is defined. Set work sequences logged in If a work sequence is currently logged in and this option is active, the start time for this work sequence is ALWAYS the present. This only works for forward scheduling.

Reference Report Calculation type is available in APS list view Gantt Display Calculation type is available in the Gantt display

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