UNIT I INTRODUCTION TO PLC Period
Automation – Components of Automation – Factory Automation and Process
Automation – Advantages of Automation – Block diagram of PLC – Principle
of operation – PLC Scan – Advantages of PLC.
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Typical Discrete I/O field Devices – Sinking and Sourcing I/O modules – Relay
output module – Criteria for selection of suitable PLC – List of PLCs available
in the market – Develop ladder program using Relay type instructions –
Introduction about Time Instructions about Timer Instructions – ON Delay and
OFF Delay Timer – Retentive Timer Instruction.
Practical Exercises:
Ex.No. Name of the Experiment Period
1. PLC BASED DOL STARTER
Sequence of Operation:
Develop and Execute Ladder Logic in PLC for DOL Starter Operation
with Single Phasing Prevention. Check the output by interfacing PLC
with three phase Cage Induction Motor.
5
2. INTERFACING OF DISCRETE FIELD DEVICES WITH PLC
5
Sequence of Operation:
Develop Ladder in PLC to execute the following logical relation
between the input and output field devices.
• Y = A + B + C + D
• Y = A.B.C.D
• Y = (A + B) ⋅ (C + D)
• Y = (A.B) + (C.D)
Interface Push Button (A), Limit Switch (B), Reed Switch (C) and 3 wire
Proximity Sensor (D) and Buzzer (Y) with PLC and check the output.
3 PLC BASED STAR DELTA STARTER
Sequence of Operation:
Develop and Execute Ladder Logic in PLC for Automatic Start – Delta
Starter Operation. Check the output by interfacing PLC with three phase
cage induction motor.
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(iv)
4 PLC BASED FORWARD AND REVERSE CONTROL OF
INDUCTION MOTOR*
5
Sequence of Operation:
Develop and Execute Ladder Logic in PLC to control three phase induction
motor in Forward and Reverse direction of Rotation. Interface external
pilot lamp with PLC to indicate the direction of rotation. Check the output
by interfacing PLC with three phase cage induction motor.
5 PLC BASED CONVEYOR SYSTEM WITH PRE WARNING SIREN
5
Sequence of Operation:
Develop and Execute Ladder Logic in PLC using an ON delay timer
to delay the start of a conveyor. While press the START button, activate
the Warning Siren for Pre-Set Time. After the Pre-Set time delay the
Warning siren turns OFF and the conveyor starts running. When STOP
button is pressed turns OFF the conveyor.
6 PLC BASED WATER LEVEL CONTROL SYSTEM
5
Sequence of Operation:
Develop and Execute Ladder Logic in PLC to fill the empty tank with
liquid when the START button is pressed. When liquid reaches the
HIGH Level, turn OFF the Pump Motor and turn ON the Solenoid
Valve to drain the liquid from tank. When liquid reaches the LOW
Level, turn OFF the Solenoid Valve and turn ON the Pump Motor for
refilling. Interface external pilot lamp with PLC to indicate the operation
of Pump Motor and Solenoid Valve.
Theory Portion:
UNIT II COUNTERS, MATH & DATA COMPARE INSTRUCTIONS Period
Introduction about Counter Instructions – Up Counter – DOWN Counter –
Applications of Counter Instructions – Math Instructions – Data Compare
Instructions – Simple programs using above instructions.
3
Practical Exercises:
Ex.No. Name of the Experiment Period
7 PLC BASED COUNTING OF MOVING OBJECTS ON A CONVEYOR 5
Sequence of Operation:
Develop and Execute Ladder Logic in PLC for counting the object
moving in the conveyor. Interface manual START and STOP push
buttons to operate the conveyor motor and Proximity sensor detect the
object. Interface buzzer to give beep sound while sensor is detecting
the product. When the pre-set value of count has reached turn OFF the
conveyor automatically.
(v)
8 PLC BASED COUNTING OF MOVING OBJECTS ON TWO CONVEYORS 5
Sequence of Operation:
A manufacturing plant is arranged with 2 feeder conveyors for
transferring the Objects into the plant. Develop and Execute Ladder
Logic using math instruction in PLC to get the total number of objects
transferred by 2 conveyors into the Plant. When the count of total object
has reached pre-set count value, turn ON buzzer to give beep sound
for 1 second and turn OFF the conveyors.
9 PLC BASED CAR PARKING CONTROL SYSTEM
5
Sequence of Operation:
A parking lot allows 10 cars. Sensor 1 senses the incoming car at
ENTRY Gate. Sensor 2 senses the outgoing car at the EXIT Gate.
Develop and Execute ladder logic in PLC to count the number of cars
parked and based on the parking slot available turn ON pilot lamps to
indicate FULL or AVAILABLE. Interface suitable proximity sensors
with PLC.
10 PLC BASED FAN CONTROL FOR ENERGY CONSERVATION
Develop and Execute a ladder logic in PLC to operate Fans in the
Meeting Hall based on counting the number of persons entering into
the Hall. Interface suitable types of sensor with PLC to sense the person
entering into the hall through ENTRY Gate. Interface Low Voltage DC
Fan with PLC to check the output. Assume the capacity of the Meeting
Hall as 10 or something.
5
• If less than 50% of the hall capacity is filled, turn ON Fan F1 & F2.
• If 70 to 80% of the capacity is filled turn ON Fan F1 to F3.
• If greater than or equal to 90% of capacity is filled turn ON F1
to F4.
11 PLC BASED THREE FLOOR LIFT CONTROL SYSTEM 5
Develop and Execute a ladder logic in PLC to control Lift/Elevator in
3 floor system. Interface Call buttons, suitable sensors for detecting
floors and Motor with PLC to check the sequence of operation.
Theory Portion:
UNIT III ANALOG I/O MODULE & INDUSTRIAL NETWORK Period
Analog Input – Typical Analog Input field devices – Analog Output Modules –
Typical analog output field devices.
Block diagram of I/O bus networks – Serial communications – Fieldbus Networks
– Typical PROFIBUS architecture – Typical Foundation fieldbus architecture –
Importance of HMI and SCADA in Automation – Typical SCADA architecture.
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(vi)
Practical Exercises:
Ex.No. Name of the Experiment Period
12. PLC BASED ILLUMINATION CONTROL SYSTEM.
Develop and Execute a ladder logic program for multilevel illumination
control system.
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• When the potentiometer reaches 25% of its value, turn ON one
Lamp in the output to get minimum illumination.
• When the potentiometer reaches 50% of its value, turn ON two
Lamps in the output to get medium illumination.
• When the potentiometer reaches 75% of its value, turn ON three
Lamps in the output to get Maximum illumination.
TOTAL PERIODS 75