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Chapter 7 Controlling the Total Planning Run

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Activate MRP

Set up planning file

Maintain MRP data:valid MRP typevalid material status

Prerequisites for MRP

PlantPlant

MaterialsMaterials

AA

MaterialMaterial

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Settings in MRP

Prio

rity MRP group

AA

MaterialMaterial

Material master

AAMaterial 2Material 2

AAMaterial 1Material 1

...

Plant parameters

The settings for materials planning are mainly controlled at three levels:

material master record

MRP group

plant parameters

If a setting is possible at each one of these three levels, the priorty displayed above is valid.

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Planning Sequence: Low-Level Coding

Finished product 1Finished product 1 Finished product 2Finished product 2

Assembly 1Assembly 1 Assembly 2Assembly 2

Component 1Component 1 Component 2Component 2 Component 3Component 3

Component 4Component 4

Low-level code 000Low-level code 000

Low-level code 001Low-level code 001

Low-level code 002Low-level code 002

BOMsBOMsFinished product 1

Assembly 1 Component 2

Component 1 Component 2

Finished product 2

Assembly 2 Component 4

Component 2 Component 3

The low-level code is the lowest level at which the material appears in a bill of material.

The low-level code controls the sequence of the planning run - the system plans the materials with the low-level code 0 first and then those with low-level code 1, and so on.

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Net Change Planning

Material undergone achange relevant to MRPMaterial undergone achange relevant to MRP

Planning filePlanning file

Rea

d

Res

et

AA

MaterialMaterial

Planning Planning runrun

In net change planning, the system only plans materials with the appropriate indicator.

The planning file entry contains the following information:

the low-level code of the material

whether the change refers to an element within the planning period

whether the BOM has to be re-exploded

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Planning in the Planning Horizon

Net change planning in the planning horizon:material is planned

Net change planning in the planning horizon:material is planned

Planning horizon

Time

Planning horizon

!!! Time

Net change planning in the planning horizon:material is not planned

Net change planning in the planning horizon:material is not planned

Today

Today

To improve the performance of the planning run, you can limit the planning horizon. This means that the system will only create receipt elements for the requirements that lie in the planning horizon.

Note that as time passes, requirements that are not yet covered by receipts may move into the planning time fence. If no other changes relevant to planning occur, these requirements will not be covered until you carry out a planning run over the total time axis using the control indicator NETCH. Therefore, you should carry out this planning run at regular intervals.

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Server 01

Server 02

Server 03

DB Server

Material 01Material 01

Material 02Material 02

Material 03Material 03

MRP MRP dispatcherdispatcher

PlanningPlanningfilefile

DB changesDB changes

Parallel Processing

Distributing the work to several application servers.

This significantly improves the performance of the planning run.