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6. IDEF Modeling of Corporations

• IDEF is a diagramming method used to describe systems.

• developed by ICAM (Integrated Computer Aided Manufacturing)

• Three (3) levels of IDEF models:

IDEF0: model of process flows

IDEF1: modeling of the nature of data handling

IDEF2: modeling of the dynamic behavior of a process

• We will examine IDEF0 for modeling processes. Other models would be useful when designing complex information systems.

• A process can also be represented with an IDEF0 diagram.

• IDEF serves to illustrate the relationship of all processes in a system in a graphical format

• Boxes represent activities or functions.

• Information or data needed to carry out the activities or products produced by the activities are represented by arrows.

• A top down diagramming method is used.

• The model starts off with a single block that represents the entire system or process.

• The first block diagram is “expanded” to more detailed diagrams or processes.

• The collection of successively more detailed diagrams is the IDEF model

• This is the top level of the IDEF model.

• This box is labeled as A0 (“0” indicates the top level)

• Decomposing “A0” will produce another set of boxes and process flows.

6.1 Problems
Problem 6.1 In the Shop Floor Production Model (SFPM), a PLC connected to a robot, NC machine and safety systems would be considered,

a) Section/Area Control (Level 4)

b) Cell Control (Level 3)

c) Station Control (Level 2)

d) Equipment Control (Level 1)

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Answer 6.1 c

Problem 6.2 In the IDEF0 diagram below,

a) there are more than 10 problems

b) there are 6 to 10 problems

c) there are 1 t o 5 problems

d) there are no problem

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Answer 6.2 b

Problem 6.3 Draw an IDEF diagram to describe how you study for, and write an exam.