extrusion art in the preferred embodiment the plc 39 s are those sold as model 5 25 by allen bradley of cleveland ohio the plc 39 s are tied to both the supervisory computer 32 and the display input terminals 42 46 by a network 54 the network of the presently preferred embodiment is that sold by allen bradley under the trademark data highway display input terminals 42 46 are also generally well known to those having ordinary skill in the nonferrous extrusion art the terminals of the preferred embodiment are those sold as model t30g by allen bradley of cleveland ohio the terminals permit the display of logic functions and or operations of the various plc 39 s the terminals also permit manual input by human operators within the facility 10 to indicate when material is removed from the system although the plc 39 s 34 38 and 40 and the terminals 42 46 are generally known to those having skill in the nonferrous extrusion art they have not heretofore been controlled by a supervisory computer such as 32 the plc 39 s have been used in a rather unsophisticated manner specifically an operator at each terminal 42 46 observes the operation of the system and inputs the required commands to the plc 39 s depending on a paper job order which he has received for each job moving sequentially through the system the present invention utilizes the time tested and reliable plc 39 s to provide total system integration and computer control of material moving through the system the supervisory computer 32.