Introduction to Industrial Automation

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 4 

Logical Design of Automation Circuits .......................................................................117

4.1  Introduction to Logical Design of Automation Circuits .......................................117

4.2  Boolean Logic Components ..................................................................................118

4.2.1  Postulates and Theorems of Boolean Algebra .......................................... 120

4.3  State Diagrams .....................................................................................................121

4.3.1  Classical State Diagrams ..........................................................................121

4.3.2  State Diagrams with Sensors ................................................................... 124

4.3.3  Step-by-Step Transition due to a Discrete Successive Signal .................... 128

4.3.4  State Diagrams with Time Relays ...........................................................133

4.3.5  Components’ State Diagram Method ......................................................135

4.3.6  State Diagrams and Minimum Realizations ............................................137

4.3.7  Sequential Automation Systems .................................................................142

4.4 Applications ..........................................................................................................145

4.4.1  Bidirectional Lead Screw Movable Worktable with Two Speeds ..............146

4.4.2  Palindromic Movement of a Worktable with Memory ..............................148

4.4.3  Operation of N Machines with Pause under Specific Conditions .............151

Problems .........................................................................................................................155