On/Off Control (bang-bang) Proportional Control

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Presentation transcript:

On/Off Control (bang-bang) Proportional Control Control of Motion On/Off Control (bang-bang) Proportional Control closed loop open loop

Boolean Arithmetic

Digital Logic Expressions When part is ready, cylinder is retracted, and emergency stop is not on, then cut while cylinder is not fully extended and emergency stop is not on.

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

Pneumatic Schematics

Pneumatic Schematics

Electric Logic Control Input and Output Ladder diagrams Timing diagrams State machines

I/O Activity Levels Active High - active level is logic 1 (+V) Active Low - active level is logic 0 (GND)

Ladder Diagrams

Example - Relay Logic

Example - Relay Logic

Example - Relay Logic

Example - Relay Logic

Timing Diagrams

State Machines

State Diagram

Logic Equation and Ladder Diagram

Example - Relay Logic

Another Example iSENSOR S0 S1 S2 iEXT /iSENSOR•iRET oCYL=1 oCYL=0

Example #2 State Diagram iSENSOR S0 S1 S2 iEXT /iSENSOR•iRET oCYL=1 oCYL=0 cS0 = cS2•/iSENSOR•iRET + cS0•/iSENSOR + /cS0•/cS1•/cS2 cS1 = cS0•iSENSOR + cS1•/iEXT cS2 = cS1•iEXT + cS2•/(/iSENSOR•iRET) = cS1•iEXT + cS2•(iSENSOR + /iRET)