Rockwell Automation FactoryTalk Scheduler Users Guide - Manual (Page 40)

F ACTORY T ALK S CHEDULER U SER ’ S G UIDE
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The final example illustrates a non-traditional network routing structure. Project
management and maintenance environments frequently use these types of networks. This
example illustrates the flexibility of the two numbering schemes.
Most industrial applications use the operation sequence numbering scheme because their
routings tend to follow a straight line with occasional assembly operations. In addition,
this scheme directly supports the routing numbering scheme used by most Enterprise
Resource Planning (ERP) and Manufacturing Resource Planning (MRP) systems. The
immediate successor operation scheme is generally only used when routings are more like
a network as shown in our last example.
Tutorial : The routings for our tutorial system are simple routings in that only root
numbers are required to describe the sequencing constraints. Thus, we have chosen to use
the operation sequence numbering scheme. Recall that routing diagrams using this
scheme were included in the previous chapter.
Material constraints
Material constraints typically are used to represent any make-to-stock or purchased items
that constrain the scheduling of operations. This information is normally found in the
10
(10)
30.1.1
(50)
40
(60)
30.1.2
(40)
20.1
(30)
20.1.2
(20)
Immediate Successor Table
OSN Scheme Operation
Number
ISO Scheme Operation
Number
Immediate Successor
Operation Number
10 10 20 & 30
20.1.2 20 40
20.1 30 40 & 50
30.1.2 40 60
30.1.1 50 60
40 60