Control of Motion
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Transcript of Control of Motion
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Control of Motion
• On/Off Control (bang-bang)• Proportional Control
– closed loop– open loop
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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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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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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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Boolean Arithmetic
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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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Another Example
iSENSOR
S0
S1
S2
iEXT
/iSENSOR•iRET
oCYL=1
oCYL=0
oCYL=0
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Example #2 State Diagram
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)
iSENSOR
S0
S1
S2
iEXT
/iSENSOR•iRET
oCYL=1
oCYL=0
oCYL=0