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Published byApril Payne Modified over 8 years ago
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Control of Motion On/Off Control (bang-bang) Proportional Control –open loop –closed loop
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Digital Logic Expressions Pickup when part is ready, and cylinder is retracted, and emergency stop is not on, or while cylinder is not fully extended and emergency stop is not on. oPICK = (iPARTRDY iCYLRETRACT + oPICK /iCYLEXTEND) /iESTOP
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Pneumatic Logic Elements Directional control valve Shuttle valve - OR function Twin pressure valve - AND function Other functions –Check valve –Speed control valve –Time delay valve
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Electric Logic Control Input and Output Ladder diagrams Timing diagrams State machines
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Electric Logic Elements wired in series = AND wired in parallel = OR Relay = NOT
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Boolean Arithmetic
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Relays
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I/O Activity Levels Active = TRUE Inactive = FALSE Active High - active level is +24 volts Active Low - active level is 0 volts (GND)
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Ladder Diagrams N.O. Contact N.C. Contact Coil
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Example – Light Switch
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Example – Light Relay
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Example – Light Relay, “And” Logic
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Example – Light Relay – “OR” Logic
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Timing Diagrams
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State Machines
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State Diagram
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Logic Equation and Ladder Diagram
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Example – Latching Relay Logic
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