programmable logic controls training day 3
TRANSCRIPT
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PLC Training Day 3
Ladder Diagrams
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Sequential Programming
• What is sequential Programming ?
• Why is it important ?
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Sequential Programming
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Sequential Programming
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Sequential Programming
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Sequential Programming
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Sequential Programming
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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
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Initial Conditions
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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.
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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