Production Planning and Control
Production Planning and Control
Material Requirements Planning
components quantities are needed and #hen$
Requires:
%Inventory status
%)ead times
Assumptions
2$ Infinite capacity$
Idea is to 34ac1 out5 demand for components 4y using
leadtimes and 4ills of material$
MRP Procedure
2. Lot Sizing: planned order quantities
3. Time Phasing: planned orders 4ac1ed out 4y leadtime
4. B! "#$%osion: gross requirements for components
Inputs
7 !aster Pro'ution She'u%e (!PS): due dates
and
quantities for all top level items
7 Bi%%s o !ateria% (B!): for all parent
items
7 *n+entor, Status: 'on hand plus scheduled
receipts( for all
items
Material Requirements Planning
80ample ime , . 2 ; : < = >
&I 9 . , 9 9 9 9 9
@R -. -, ,, ,< ,: ,. ,> ,;
P+R8 ,, ,< ,: ,. ,> ,; A A
Material Requirements Planning
o# many Cs #ill 4e affected
o# can #e fi0 the pro4lem
Rough Cut Capacity Planning 'RCCP(
7 *uic1 chec1 on capacity of 1ey resources
7 se &ill of Resource '&+R( for each item in
MPS
7 !enerates usage of resources 4y e0ploding MPS against
&+R
'offset 4y leadtimes(
7 Infeasi4ilities addressed 4y altering MPS or adding
capacity 'e$g$"
overtime(
