Verbal Associations of Relay Ladder Logic

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(No Transcript)
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National Educators Trainers Conference
HVAC Excellence Hampden Engineering
When Performance Counts
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Welcome To
Hampden Engineering's
Verbal Association of Relay Logic
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Verbal Association of Relay Logic
This IS NOT, what you think it IS , AND OR IS,
it ?
Presented By
Michael J Flynn
Hampden Engineering
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Verbal Association of Relay Logic
This IS NOT, what you think it IS , AND OR IS,
it ?
Presented By
Hampden Engineering
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Verbal Associations of Relay Ladder Logic
What is?
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Verbal Association of Relay LogicIS

• a simple powerful tool to
• Understand
• Create
• And Communicate
• Relay Logic Diagrams

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Verbal Associations of Relay Ladder Logic

• With the increasing complexity of todays HVAC
  equipment such as DDC management systems from
  Johnson, Honeywell and Siemen
• The ability to quickly read and understand Relay
  Ladder Logic diagrams is an important
• and Valuable skill !!

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Verbal Associations of Relay Ladder Logic

• With the increasing complexity of todays
  Automotive equipment
• The ability to quickly read and understand Relay
  Ladder Logic diagrams is an important
• and Valuable skill !!

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Objectives of this Presentation
1. Explain The Verbal Associations of Relay
Ladder Logic.
2. Use the verbal associations to describe the
operation of a ladder logic diagram.
3. Use verbal associations to develop a ladder
diagram from a description of operation.
4. Appreciate the power and importance of this
capability.
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Verbal Associations of Relay Ladder Logic
Normally Open IS
Associate the word Is for all normally open
devices
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Verbal Associations of Relay Ladder Logic
Normally Open IS
Associate the word Is for all normally open
devices
This Normally Open Pushbutton passes current if
it Is pushed.
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Verbal Associations of Relay Ladder Logic
Normally Open IS
Associate the word Is for all normally open
devices
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Verbal Associations of Relay Ladder Logic
Normally Open IS
Associate the word Is for all normally open
devices
This Normally Open Float Switch passes current if
the liquid level its detecting Is high.
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Verbal Associations of Relay Ladder Logic
Normally Open IS
Associate the word Is for all normally open
devices
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Verbal Associations of Relay Ladder Logic
Normally Open IS
Associate the word Is for all normally open
devices
This Normally Open Contact passes current if the
relay controlling it Is energized.
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Associate the word Is for all normally open
devices
This Normally Open Pushbutton passes current if
it Is pushed.
This Normally Open Float Switch passes current if
the liquid level its detecting Is high.
This Normally Open Contact passes current if the
relay controlling it Is energized.
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Verbal Associations of Relay Ladder Logic
Normally Closed NOT
Associate the word Not for all normally closed
devices
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Verbal Associations of Relay Ladder Logic
Normally Closed NOT
Associate the word Not for all normally closed
devices
This Normally Closed Pushbutton, passes current
if its Not pushed.
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Verbal Associations of Relay Ladder Logic
Normally Closed NOT
Associate the word Not for all normally closed
devices
This Normally Closed Pushbutton, passes current
if its Not pushed.
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Verbal Associations of Relay Ladder Logic
Normally Closed NOT
Associate the word Not for all normally closed
devices
This Normally Closed Pushbutton, passes current
if its Not pushed.
This Normally Closed Temperature Switch, passes
current if the temperature is Not high.
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Verbal Associations of Relay Ladder Logic
Normally Closed NOT
Associate the word Not for all normally closed
devices
This Normally Closed Pushbutton, passes current
if its Not pushed.
This Normally Closed Temperature Switch, passes
current if the temperature is Not high.
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Verbal Associations of Relay Ladder Logic
Normally Closed NOT
Associate the word Not for all normally closed
devices
This Normally Closed Pushbutton, passes current
if its Not pushed.
This Normally Closed Temperature Switch, passes
current if the temperature is Not high.
This Normally Closed Contact passes current if
the relay controlling it, is Not energized.
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Lets Review
Normally Closed NOT
Associate the word Not for all normally closed
devices
This Normally Closed Pushbutton, passes current
if its Not pushed.
This Normally Closed Temperature Switch, passes
current if the temperature is Not high.
This Normally Closed Contact passes current if
the relay controlling it, is Not energized.
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
And
This circuit passes current if temperature is
high And pressure is high.
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
This circuit passes current if control relay 1
And control relay 2 are both energized.
CR 1
CR 2
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
This circuit passes current if control relay 1
And control relay 2 are both energized.
And
CR 1
CR 2
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
This circuit passes current if control relay 1
And control relay 2 are both energized.
CR 1
CR 2
2
1
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
This circuit passes current if control relay 1
And control relay 2 are both energized.
CR 1
CR 2
This circuit passes current if the NO button 1 is
pushed And the NO button 2 is pushed.
2
1
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Verbal Associations of Relay Ladder Logic
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
This circuit passes current if control relay 1
And control relay 2 are both energized.
CR 1
CR 2
This circuit passes current if the NO button 1 is
pushed And the NO button 2 is pushed.
And
1
2
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Lets Review
Series AND
Associate the word And for all devices in series
This circuit passes current if temperature is
high And pressure is high.
This circuit passes current if control relay 1
And control relay 2 are both energized.
CR 1
CR 2
This circuit passes current if the NO button 1 is
pushed And the NO button 2 is pushed.
2
1
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
Or
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high.
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high.
Or
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high.
CR 1
This circuit passes current if control relay 1 Or
control relay 2 is energized.
CR 2
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high.
CR 1
This circuit passes current if control relay 1 Or
control relay 2 is energized.
CR 2
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Verbal Associations of Relay Ladder Logic
Parallel OR
Associate the word Or for all devices in parallel
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high.
CR 1
This circuit passes current if control relay 1 Or
control relay 2 is energized.
Or
CR 2
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Lets Review
Parallel OR
Associate the word for all devices in
parallel
Or
This circuit passes current if temperature is
high Or pressure is high.
This circuit passes current if the NO button is
pushed Or the liquid float switch is high.
CR 1
This circuit passes current if control relay 1 Or
control relay 2 is energized.
CR 2
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Verbal Relay Ladder Logic Exercise 1
CR 1
CR 1
CR 1
CR 1
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Verbal Associations of Relay Ladder Logic
Is
And
CR 1
Or
Not
Is
CR 1
Is
CR 1
Not
CR 1
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
CR 1
Not
CR 1
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
CR 1
Not
CR 1
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
CR 1
Not
CR 1
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
CR 1
Not
CR 1
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Verbal Relay Ladder Logic Exercise 2
Start
Stop
CR 1
CR 1
CR 1
CR 1
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
And
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
And
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
And
Is
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
And
Is
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
And
Is
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
And
Is
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
And
Is
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Verbal Associations of Relay Ladder Logic
Start
Stop
Is
And
CR 1
Or
Not
Is
CR 1
Is
And
Is
CR 1
Is
And
Is
Or
CR 1
Is
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Using Verbal Associations of Relay Ladder Logic
What if, a customer asks you to wire a piece of
equipment, so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
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Verbal Relay Ladder Logic Exercise 3
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Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
69
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
70
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
71
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
72
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
73
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
74
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
75
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
76
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Bypass Air Switch
77
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
Device
Bypass Air Switch
78
Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator is standing on the safety mat, and the
protective guard is in place, and the compressed
air supply is on, or the bypass air switch is on,
and the emergency lockout is not on.
Emergency Lockout
Safety Mat
Protective Guard
Pressure Switch
Device
And
And
Not
And
Is
Is
Is
OR
Bypass Air Switch
Is
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Verbal Relay Ladder Logic Exercise 1
CR 1
CR 1
CR 1
CR 1
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Verbal Relay Ladder Logic Exercise 2
Start
Stop
CR 1
CR 1
CR 1
CR 1
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Verbal Relay Ladder Logic Exercise 3
Safety Mat
Pressure Switch
Emergency Lockout
Protective Guard
Bypass Air Switch
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Verbal Associations of Relay Ladder Logic
What if a customer asks you to wire a piece of
equipment so that it operates only when the
operator __ standing on the safety mat, ___ the
protective guard __ in place, ___ the compressed
air supply __ on, __ the bypass air switch __ on,
___ the emergency lockout is ___ on.
Safety Mat
Protective Guard
Pressure Switch
Emergency Lockout
___
___
___
Device
___
__
__
__
__
__
Bypass Air Switch
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