polyhouse automation using plc
TRANSCRIPT
POLYHOUSE AUTOMATION
Presented ByMahendra MagreRitesh JadhavSamadhan Parsewar
INTRODUCTION
• What is POLYHOUSE ???• 3 “P” s – Protective– Productive– Profitable
• Objective of the Project
INTRODUCTION (continued….)
Need for Automation• Automatic Control• Reduces Human Error• Minimizes labor cost• Manages unwanted environmental conditions• Increases productivity
SYSTEM DESIGN
PLC
Crop Selection
Panel
Monitoring SystemSensors
Polyhouse Monitoring System
SYSTEM IMPLEMENTATION
Selection Panel :• Consists of LED indicators and Toggle switches Programmable Logic Controller :• Allen Bradley Micrologix 1200C• Specifications-8 DI & DO,2 AI & AO• Sensors• Soil Moisture sensor :- Soil moisture circuit• Temperature Sensor:- Thermistor• Light Intensity:- LDR
DESIGN OF SENSORS
1) Temperature sensor: - • Required range: 25 C to 50 C ⁰ ⁰• Thermistor is used in
Wheatstone bridge for signal conditioning.
2) Light Intensity Sensor: - •LDR is used •Wheatstone bridge •Instrumentation amplifier circuit for amplification
3) Soil Moisture Sensor:-– Moisture content of soil is determined– Two conductive plates are used– Relative humidity of 60 – 80 % required
FLOW CHART
PROCESS CONTROL
Programmable Logic Controller
Programmable device
CPUInputModule
Memory
Power Supply
OutputModule
SensorsLimit s/wPress. s/wEtc.
Control valves,Motor StarterEtc.
TYPES OF PLCs :1) Fixed Plc2) Modular Plc
Programming Languages in PLCs :Ladder Logic ( LAD/LD ) Structured Text ( ST) Instruction List ( IL ) Sequential Function Chart ( SFC ) Function Block Diagram ( FBD )
PROGRAMMING OF PLC
1) Ladder Diagram: • electrical sequences of operations. • represent the interconnection of field
devices OnOff
acc. to predetermined sequence of events• Purpose - represent hardwired logic
circuits
• If it is < set point, then one output will be done.
2) Steps Description:• Mov Analog input to N7.• Compare this value with the set point
integer value stored in register• two actions according to the comparison.
• If it is > set point, then other output will be done.
• The above 3 steps will occur simultaneously for three input sensors.
• Crop selection is done using the toggle switch.• The toggle switch which is currently selected will
complete the specific rung
REFERENCES
• “Programmable Logic Controllers” by V.R.Jadhav.• “Process Control Instrumentation Technology”, Johnson C.
D., 7th edition, Pearson Education, New Delhi, 2003.• Ramakant A. Gayakwad, “Op-Amps and Linear Integrated
Circuits”, Publisher PHI prentice hall India, Fourth Edition, 543, Page no.438,439.
• “Sensors and Transducer”,B.C.Nakra& K.K.Chaudhry.• http://www.aces.edu/pubs/docs/A/ANR-1144/index2.tmpl• http://www.haifa-group.com/files/Guides/tomato/
Tomato.pdf• http://www.nr.gov.nl.ca/nr/agrifoods/crops/veg_pdfs/
spinach.pdf
Thank you ….!
• Any Questions……?