Finite Capacity Scheduling Instruments

Calculating and working with earliest material availability

The VAPS takes into account the earliest material availability date = EMAD

Material availability: Fundamentals

As of now, we calculate the material availability per production order, meaning on production order level, not on routing line/operation level:
• We calculate a value that we call EMAD
• EMAD = earliest material availability date

Basics of the EMAD calculation

  • We create a unique list of component demand
    • Day by day
    • We take into account
      • Demand from production orders
      • Demand from sales orders
      • Demand from transfer lines
      • Demand from job planning lines
      • Demand from service lines
      • Demand from assembly orders
  • Then we create a unique list of component supply
    • Day by day
    • We take into account
      • Supply on inventory
      • Supply from purchase orders
      • Supply from production orders
      • etc.
  • Then we allocate component supply to component demand

How we allocate

  • First we remove any reservations, because reserved components will never get allocated
  • Then, day by day, we allocate an available component to a
    component demand
  • You can define the priority which demand to supply first
    Example: sales orders first, then production orders, then transfer orders

  • If there is enough component supply on a certain day, we allocate that supply to the component line, and have an earliest material availability date for that component.

Setting the EMAD

  • A production order typically requires multiple components
  • If all components are available in the look ahead window timeframe,
    each component line gets an EMAD
  • We take the latest EMAD of all component lines as the EMAD for the
    production order. Example:
    • Production order 1
      • Component 1 – EMAD = December 1
      • Component 2 – EMAD = November 20 
      • Component 3 – EMAD = December 4
    • EMAD for production order 1 = December 4