taklimat plc july 2008
TRANSCRIPT
Welcome to Politeknik Tuanku Sultanah Bahiyah.
For PLC And CX-ProgrammerTraining Course.
Duration : 2 Days courseTime : 8.30a.m - 4.30p.m Instructor : Koh Foo Hin
En. Mohd Elias
Development of The Course
Day 1
8.30a.m -9.00a.m : Your understanding about PLC
9.00a.m -10.00a.m : Introduction of PLC
10.00a.m -11. 00a.m : System Configuration &
Features & Function &
Unit Specification & Components
11.00p.m - 12.00p.m : Basic Command with Basic Programming method.
2.30p.m - 4.30p.m : Exercise With Actual Application
Development of The Course
Day 2
8.30a.m -9.00a.m : Overview of PLC
9.00a.m -12.00a.m : Continue with new Exercise
2.30p.m - 4.30p.m : Exercise With Actual Application and briefing about the intermediate for PLC
What kind of control system in a plant
Start & StopOperation
What kind of control system in a plant
Contactors, relays, timers & countersin the control panel
ControllingControlling
Motor pump
Valve
Mixer
Read & DisplayRead & Display
Flow Rate
Float Level
Oxygen Level
Hardwire logic control circuit
Relay 1
StartStart StopStop
Relay 1
PumpTimer
TimerRelay 1 Solenoid
A picture of hardwire relay logic
What is PLC ?
ProgrammableProgrammableLogicLogicControllerController
A solid-state device used to control machine or process operation by means of a stored program and feedback from input and output devices
Introduction to PLCIntroduction to PLC
BrainBrainSense Action
You
See
Listen
Taste
Touch
Smell
Hand
Leg
Mouth
HumaHumann
CPU
MemoryInput
Output
ProgrammingDevice
Power Supply
SignalsfromSwitches,Sensors,etc
Signals tosolenoids,motor,lamps,etc.
Operate by monitoring input signals and providing output signals. When changes are detected in the input signals, the PLC reacts, through the user-programmed
internal logic, to produce output signalsIt continuously scans the program in its memory to
achieve this control
PLC
PLCPLC HardwireHardwireLogicLogic
Control Device
Specific Purpose
General Purpose
Wired LogicWired Logic PLCPLC
Control sequence isControl sequence isfixed for one designfixed for one design
Control sequence can beControl sequence can bechange from time to timechange from time to time
without need to rewirewithout need to rewire
Wired LogicWired LogicPLCPLC
Control Scale
Small & Medium Medium & Large
Modification
An example for hard wire logic
Relay 1
StartStart StopStop
Relay 1
Pump
Timer
Timer
Relay 1Solenoid
Relay 1
StartStart StopStop
Relay 1
Pump
Counter
SolenoidRelay 1
Counter
#30StopStop
Hardwire logic will need to rewire everything
Modification
The same example for PLC
Relay 1
StartStart StopStop
Relay 1
Pump
Timer
Timer
Relay 1Solenoid
LD STARTOR RELAY 1AND NOT STOPOUT RELAY1OUT SOLENOIDLD RELAY 1TIM 000
#0020LD TIM 000OUT PUMP
Modification
The same example for PLC
Only need to change the ladder program
Relay 1
StartStart StopStop
Relay 1
Pump
Counter
SolenoidRelay 1
Counter
#30StopStop
LD STARTOR RELAY 1AND NOT STOPOUT RELAY1OUT SOLENOIDLD RELAY 1LD STOPCNT 000
#0030LD CNT 000OUT PUMP
Wired LogicWired Logic PLCPLC
Delivery Period
Several days Almost Immediate
MaintenanceDifficult Easy
LED indicator
Wired LogicWired LogicPLCPLC
Input/output connectorcan be remove easily
without using screw driver
ProgrammingConsole
Economic Efficiency
Advantage onsmall scale
Advantage onsmall, medium
and large
$$$$$$Wired LogicWired Logic PLCPLC
Power Consumption
High Low
0.2 Amp> 2 Amp
WiredWired LogicLogic PLCPLC
What PLC can doWhat PLC can do
Sequence ControlSequence ControlSequence ControlSequence Control
Relay 1
StartStart StopStop
Relay 1
Pump
Timer
Timer
Relay 1Solenoid
Relays
Timers & Counters
Sophisticated ControlSophisticated ControlSophisticated ControlSophisticated Control
+-x/
2
1
3 4
5
Prod Pass RejectAA 33 4BB 27 3CC 43 8
Arithmetic Operation
Analog ControlInformation Handling
Supervisory ControlSupervisory Control
PLC
Computer
PrinterFA
Network
Process Monitoring
Pager
Why & When to use PLCWhy & When to use PLC
Dramatically increase in population and housing developmentLimited landLimited land for plant
Upgrading of small plant to run higher capacity would involve complicated controlcomplicated control system, Intermittently Decanted Extented Aeration (IDEA).
A higher capacityhigher capacity of plant with high efficiency required
For that purpose, PLCPLC can do the job
Nation-wide Coverage
ElcompTradingElcompTrading
AutovationAutovation
RobomaticsRobomatics
OmmuraOmmura
EM SystemEM System
OMRON ELECTRONICS SDN.BHD
SALES NETWORK IN MALAYSIA
Waste Water Treatment Article
Reliable Control Solution For Waste Water TreatmentAnd Environmental Processes
In 1990, Omron controls were selected for a central FloridaWater treatment plant to ease capacity, productivity,efficiencyand reliability. The facility performed :
• Raw Water Pumping• Softening• Filtering • Storage / Distribution
The system included a PLC based station at each major processing stages, tied together with a triple-redundant network.The PLC / Computer network improved efficiency at the Water Treatment facility for about one-third the cost of a distributed control system.
One PLC control and monitors the softener systems ; two more PLCs control the filter systems; another PLC, located in the control room, controls the main storageand distribution system
Two independent host computer link networks connect the PLCs to the Computers. A peer to peer network provides a shared memory area to all PLCs on the network so that critical data - valve position, tanklevels, motor status and various plant flows are communicated automatically. This communicationis transparent to the users
Operator interface terminalssimplify control and monitoring of the entire operation. Fiber optic cables were installed for all communications networks to protect againstlightning
Data acquisition was automated by gathering all parameters from the PLCs data memories and printing
daily and monthly reports. Chemical and turbidity test results
were input into the computer byoperators for report generation
Future Expansion & Upgrading
DA
AD
Humidity Sensors
OC
OC
IDIDID
Inverter
Pumps House: 2
Pressure Interlock,
Power monitor
RS232 C
ModemDistance : 5km ~
8km
Maintenanceoffice(SCADA) Modem
RS232CPumps House: 1
Inverter
Pump 2 Pump 1 Jockey Pump
C1 C2
DA
AD
OC
OC
IDIDID
C1 C2
Pump 2 Pump 1 Jockey Pump