3023 Ladder
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Transcript of 3023 Ladder
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4/24/05 BAE 3023 1
Motor Control
PLCs and Ladder Logic
An Introduction
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4/24/05 BAE 3023 2Hard-wired Motor
Control Circuitry
Thermal protection not shown
Control
Voltage
Return
Three Phase
Line
Main Contacts
Auxillary
Contacts
Contactor Coil
M
Motor
Contactor START
STOP
Control
Voltage
Source
L1 L2 L3
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4/24/05 BAE 3023 3Manufacturers wiring
diagram
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4/24/05 BAE 3023 4Definitions - PLC
PLC: (Programmable Logic Controller) An industrial
control device developed to accept contact closure
inputs and to provide outputs that drive relay coils. The device may be re-programmed with code relating
inputs to outputs
Modern PLCs may allow analog input/output and may
support high level language functions (C, C++, BASIC)
Programming logic includes simple logic, timing functions
counting functions, sequences, and may include complex
algorithms (eg. PID)
Examples:Allen-Bradley, Schneider-Modicon, GE, Moeller,
etc.
http://www.ab.com/en/epub/catalogs/12762/2181376/2416247/1239756/2165075/http://www.ab.com/en/epub/catalogs/12762/2181376/2416247/1239756/2165075/http://www.ab.com/en/epub/catalogs/12762/2181376/2416247/1239756/2165075/http://www.ab.com/en/epub/catalogs/12762/2181376/2416247/1239756/2165075/ -
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4/24/05 BAE 3023 5Definitions - Ladder
Logic
Ladder Logic: Graphical language for describing
output of an electrical switching system as a
function of its inputs. Also known as relay ladder logic or RLL
Commonly used in PLC coding
Primarily used to relate logical inputs (switch closures) to
relay coil outputs. (Start switch used to energize a motor
contactor relay)
Commonly used to document control equipment in process
plants
Example:
START MOTOR
Control Voltage
Source
Control Voltage
ReturnContact
Coil
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4/24/05 BAE 3023 6Motor Control Ladder
Logic
Note:
Power circuit is not shown, only control wiring
Left side ladder is source, right is sink
Many rungs or circuits can be shown
Start Dryer Dryer
Control
Voltage
Return
Control
Voltage
Source
Stop Dryer
Dryer
Start Unload Unload Conveyor Stop Unload
Unld. Conv.
Contacts Loads
Contact
associate
d
withload
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4/24/05 BAE 3023 7Allen-Bradley Pico PLC
Circuit elements
I Input contact closures
Q Output contact closures (drives coil)
T Timer device
C Counter device
M Auxillary relay H Time of day
A Analog input
D Display on screen
R,S Expansion devices
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4/24/05 BAE 3023 8Demonstration
Picosoft Demonstrator
http://c/Program%20Files/PicoSoft%203.0/PicoSoft.exehttp://c/Program%20Files/PicoSoft%203.0/PicoSoft.exehttp://c/Program%20Files/PicoSoft%203.0/PicoSoft.exe -
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4/24/05 BAE 3023 9Time Delay
Time delayed start of conveyor with All STOP
Start Dryer Dryer
ControlVoltage
Return
ControlVoltage
Source
STOP
Dryer
Time Delay Unload Conveyor STOP
Unld. Conv.
Time Delay
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4/24/05 BAE 3023 10stop and start delay
Time delayed start and time delayed stop
Start Dryer Dryer
Control
VoltageReturn
Control
VoltageSource
STOP
Dryer
Start TimeDelay
Unload Conveyor
STOP
Unld. Conv.
Start Time Delay
STOP TimeDelay
STOP TimeDelay
UnloadConveyor
Relay 1Relay 1