Transcript UNIVERSIDADE FEDERAL DE SANTA MARIA CENTRO DE …

Programming PLCs
using LADDER Logic
Presentation Outline
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Review of Ladder Programming
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Keyence PLC Ladder Builder
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Example 1: Motor Control
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Example 2: Drill Control
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Example 3: Traffic Light
Programming the PLC
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Ladder Logic Diagrams
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Function Block Diagrams
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Sequential Function Charts
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Instruction List
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Structured Text
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High-Level Language
PLC Scan Cycle
Read
Inputs
Execute
Program
Update
Outputs
Ladder Logic Execution
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Rungs of Ladder diagram are solved from Left
to right and top to bottom
Branches within rungs are solved top left to
bottom right
Ladder Rung
Left Power Rail
A
D
B
F
Branch
G
P
I
E
J
H
S
K
R
Right Power Rail
Basic Ladder Programming
Basic Ladder Programming
Basic Ladder Programming
Basic Ladder Programming
Timer Setting
Timer
Output
Input Triggered
Keyence Ladder Builder
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http://www.keyence.com/products/plc.html
-> PLC Library
Free evaluation version – up to 50 times
KV -> PLC Series from Keyence
Keyence Ladder Builder
Start
-> Programs -> Keyence Applications ->
Ladder Builder for KV Sample Ver.
Keyence Ladder Builder
Create a new file. Select the KV10 model.
Keyence Ladder Builder
Ladder
Editor
Toolbar
Keyence Ladder Builder
Basic Table of I/O
KV-10
Input
Relays
0000 –
0005
Output
Relays
0500 –
0503
Internal
Relays
1000 –
1915
Timers/
Counters
T/C 000 –
063
Data
Memory
DM 0 –
0999
Example 1 – Motor Control
~
K1
K1
~
Start
~
~
Stop
K1
M1
* The overload relay has been omitted in order to
simplify the circuit
Example 1 – Motor Control
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Stop -> Input Relay 0000 (X000)
Normally Closed (NC)
Start -> Input Relay 0001 (X001)
Normally Open (NO)
Motor -> Output Relay 0500 (Y050)
Example 1 – Motor Control
Ladder Diagram:
Start
Stop
Motor
Motor
END
ENDH
Example 1 – Motor Control
Select relay
0001
Add a normally open contact
Example 1 – Motor Control
Select relay
0000
Add a normally closed contact
Example 1 – Motor Control
Add horizontal connection lines
Example 1 – Motor Control
Select relay
0500
Add an output relay
Example 1 – Motor Control
Connect the circuit to the right power line
Example 1 – Motor Control
Place the cursor below the contact of relay 0001
Select relay
0500
Add a Branch with a NO contact (OR logic)
Example 1 – Motor Control
Place the cursor below the NO contact of relay 0500.
Type END -> for end of routine . Click OK.
Example 1 – Motor Control
Place the cursor below on line 0004.
Type ENDH -> for end of program . Click OK.
Example 1 – Motor Control
Run the simulator
Example 1 – Motor Control
Execute the program for continuous scan
Example 1 – Motor Control
Start the motor
(turn on and then off the start button)
…or
double
click with
the mouse
left button
Change the status here and
Then press Write Current Value…
Example 1 – Motor Control
Stop the motor
(watch the status of the motor – relay 0500)
Example 1 – Motor Control
Stop the simulation and return to the editor
Example 1 – Motor Control
Using labels
Example 1 – Motor Control
Right click with the mouse button on the device
and select Change Label
Example 1 – Motor Control
Type the label and press OK (or Enter)
Example 1 – Motor Control
Type all labels (save the program – optional)
If you use labels you can enter the device by its label
(instead of its number)
Example 2 – Drill Control
L1
Upper
Limit Switch
M2
M1
Vertical
Motor
(up and down)
Drill Motor
L2
Lower
Limit Switch
Example 2 – Drill Control
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In the beginning of the drilling cycle the Upper Limit
Switch (0001) is closed
The START button (0000) starts the drilling cycle
The drill motor M1 (0500) must start. At the same
time, the vertical motor M2 must start to descend the
drill (0501)
The drill will stop at the Lower Limit Switch (0002).
At this time, the vertical motor start to ascend the drill
(0502).
The drill motor must stop just at the upper position.
Wait for a new drilling cycle
Example 2 – Drill Control
Non-retentive contacts:
Example 2 – Drill Control
Go to Help -> Instruction Word -> Instructions
in Alphabetical Order -> DIFU
Example 2 – Drill Control
SET – RESET instructions
Example 2 – Drill Control
Go to Help -> Instruction Word -> Instructions
in Alphabetical Order -> SET (RES)
Example 2 – Drill Control
Timing diagram:
LIMIT1
START
MOTOR1
LIMIT2
M2-DOWN
M2-UP
Example 2 – Drill Control
Example 3 – Traffic Light
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Start the operation with the switch S1
(input 0000)
The red signal must be ON for 5 seconds
(output 0500)
The green signal must be ON for 8
seconds (output 0501)
The yellow signal must be ON for 3
seconds (output 0502)
The cycle must continues until the switch
S1 is released
Example 3 – Traffic Light
Go to Help -> Instruction Word -> Instructions
in Alphabetical Order -> TMR
Example 3 – Traffic Light
Example 3 – Traffic Light
Place the cursor at the position you want to
add a Timer. Then, double click with the mouse
left button and select Instruction -> TMR
Example 3 – Traffic Light
Define the Timer number and the Preset value.
Timer number
Preset value
Example 3 – Traffic Light