Post on 05-Jan-2016
Push Button Wiring
and
Output Signal Active Options
This presentation is partially animated. Only use the control panel at the bottom of screen to review what you have seen. When using your mouse, make sure you click only when it is within the light blue frame that surrounds each slide.
Your comfort level with your responses to the following 10 question assessment tool should indicate if the presentation that follows will increase you knowledge base on the topic outlined by the questions in this tool.
Pre-presentation Self Assessment Activity
1. V+
Using the symbol
(a)
and together with
Configure the push button as an active low device.(b)Configure the push button as an active high device.
2. V+
Using the symbol
(a)
and together with
Configure the push button as an active low device.(b)Configure the push button as an active high device.
V+
Pre-presentation Self Assessment Activity
3.
V+
Label push button 1 as an active high or active low device.
Label push button 2 as an active high or active low device.
V+
V+
5.V+
Label push button 3 as an active high or active low device.
6. Label push button 4 as an active high or active low device.
V+
4.
Pre-presentation Self Assessment Activity
How may ways are there to wire a push button as an active low device?
7.
How may ways are there to wire a push button as an active high device?
8.
Pre-presentation Self Assessment Activity
A. Wire a normally open push button as an;
9.
(a) Active low push button.(actually draw this circuit to make sure you can
do it.)(b) Active high push
button.
(c) Active high push button.
B. Wire a normally closed push button as an;
(d) Active high push button.
(actually draw this circuit to make sure you can do it.)
(actually draw this circuit to make sure you can do it.)
(actually draw this circuit to make sure you can do it.)
Can a normally
10.
(a) open push button be used to make an active low output
device?
(b) open push button be used to make an active high output
device?
(c) closed push button be used to make an active low output
device?
(d) closed push button be used to make an active high output
device?
Pre-presentation Self Assessment Activity
Push Button Wiring
and
Output Signal Active Options
NO
NC
or
or
NO
NC
Push buttons come in two flavors
Normally Open
Normally Closed
NO
Push button wiring also comes in two flavors
Normally Open
(a)
V+
NO
Voltage value at this point?
The voltage value equals the value of V+
Note:
and are symbols for ground connections.
NO
Normally Open
(b)
V+
NO
Voltage value at this point?
The voltage value equals the value of 0 Volts
Note:
and are symbols for ground connections.
Push button wiring also comes in two flavors
Normally Closed
(a)
V+ Voltage value at this point?
The voltage value equals the value of ?
NC
NC V+
Note:
and are symbols for ground connections.
Push button wiring also comes in two flavors
Normally Closed
(b)V
+
Voltage value at this point?
The voltage value equals the value of ?
NC
NC 0 Volts
Note:
and are symbols for ground connections.
Push button wiring also comes in two flavors
Normally Open
Normally Closed
(a)V
+
NO
V+
(b)
V+
NO
0 Volts
(a)
V+
NC
V+
(b)
V+
NC
0 Volts
The 4 ways to wire a push button
Push button signals are labeled one of two ways
V+
NO
V+
(b)
V+
NO
0 Volts
(a)
Push button signals are labeled one of two ways
V+
NO
(b)
V+
NO
0 Volts
V+
(a)This is know as an active low output
When the push button is held down the low signal is on the wire.
Push button signals are labeled one of two ways
V+
NO This is know as an active high output
When the push button is held down the high signal is on the wire.0 Volts
(b)
V+
This is know as an active low output
When the push button is held down the low signal is on the wire.V
+
(a)
Push button signals are labeled one of two ways
(b)
V+
NO
PB1
This is know as an active high output
When the push button is held down the high signal is on the wire.0 Volts
Shorthand for describing a push button signal without drawing the wiring.
PB1 means this is push button number 1
When the push button is held down the low signal is on the wire.
The line over the top means that the button is an active low device.
Push button signals are labeled one of two ways
PB1
When the push button is held down the high signal is on the wire.
Shorthand for describing a push button signal without drawing the wiring.
PB1 means this is push button number 1
When the push button is held down the low signal is on the wire.
The line over the top means that the button is an active low device.
PB2
PB2 means this is push button number 2
No line over the top means that the button is an active high device.
Push button signals are labeled one of two ways
PB1
Active Low Push Button
When the push button is held down the low signal is on the wire.
The line over the top means that the button is an active low device.
Active High Push Button
Notice that by using this notation, you will know what signal (the high signal or the low signal) that will appear on the wire when the button is engaged without knowing how the button is wired!
When the push button is held down the high signal is on the wire.
PB2
No line over the top means that the button is an active high device.
Post Presentation Self Assessment Activity
1. V+
Using the symbol
(a)
V+
and together with
Configure the push button as an active low device.(b)Configure the push button as an active high device.
V+
2. V+
Using the symbol
(a)
V+
and together with
Configure the push button as an active low device.(b)Configure the push button as an active high device.
V+
3.
V+
Label push button 1 as an active high or active low device.
Label push button 2 as an active high or active low device.
V+
V+
5.V+
Label push button 3 as an active high or active low device.
6. Label push button 4 as an active high or active low device.
V+
4.
PB1 PB2
PB3 PB4
Post Presentation Self Assessment Activity
How may ways are there to wire a push button as an active low device?
V+
PB1
V+
V+
PB2V+
PB3
V+
PB4
Post Presentation Self Assessment Activity
7.
2 ways – PB1 and PB4
How may ways are there to wire a push button as an active high device?
8.
2 ways – PB2 and PB3
A. Wire a normally open push button as an;
V+
PB1
V+
V+
PB2
V+
PB3
V+
PB4
Post Presentation Self Assessment Activity
9.
(a) Active low push button.(actually draw this
circuit to make sure you can do it.)
(b) Active high push button.(actually draw this
circuit to make sure you can do it.)
(c) Active high push button.(actually draw this
circuit to make sure you can do it.)
B. Wire a normally closed push button as an;
(d) Active high push button.(actually draw this
circuit to make sure you can do it.)
Can a normally
V+
PB1
V+
V+
PB2
V+
PB3
V+
PB4
Post Presentation Self Assessment Activity
10.
(a) open push button be used to make an active low output
device?
YES
(b) open push button be used to make an active high output
device?
YES
(c) closed push button be used to make an active low output
device?
YES
(d) closed push button be used to make an active high output
device?
YES
End of Presentation