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

Digital Logic Expressions Cut 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.

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

I/O Activity Levels Active = TRUE Inactive = FALSE Active High - active level is +24 volts Active Low - active level is 0 volts (GND)

Boolean Arithmetic

Ladder Diagrams Coil N.O. Contact N.C. Contact

Example – Light Switch

Example – Light Relay

Example – Light Relay, “And” Logic

Example – Light Relay – “OR” Logic

Timing Diagrams

State Machines

State Diagram

Logic Equation and Ladder Diagram

Example – Latching 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)