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PLC Training Day 3 Ladder Diagrams

Programmable Logic Controls training day 3

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Page 1: Programmable Logic Controls training day 3

PLC Training Day 3

Ladder Diagrams

Page 2: Programmable Logic Controls training day 3

Sequential Programming

• What is sequential Programming ?

• Why is it important ?

Page 3: Programmable Logic Controls training day 3

Sequential Programming

Page 4: Programmable Logic Controls training day 3

Sequential Programming

Page 5: Programmable Logic Controls training day 3

Sequential Programming

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Sequential Programming

Page 7: Programmable Logic Controls training day 3

Sequential Programming

Page 8: Programmable Logic Controls training day 3

Sequential Function Chart (SFC)

• The Sequential Function Chart (SFC) is an extremely effective graphical language for expressing the high level sequential parts of a control program.

• The best of both worlds approach is to plan the program using SFC and then to translate it into ladder logic.

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SFC

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SFC

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SFC

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SFC

Page 13: Programmable Logic Controls training day 3

Initial Conditions

Page 14: Programmable Logic Controls training day 3

Transition

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States

STATE 1 is the initial state. We need to make sure that it alone is active before the start button is pressed.

Page 16: Programmable Logic Controls training day 3

States

The remaining states are switched on and offby the relevant entry and exit transitions. Thetransition relays are often only brieflyenergised so the states are latched on.

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Outputs

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Example

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Example

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Example

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Example


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