Introduction
In modern industries, automation plays a crucial role in
increasing productivity, accuracy, and efficiency. A PLC (Programmable Logic
Controller)-based automatic water bottle filling system is designed to automate
the process of filling water into bottles using a conveyor mechanism. This
system reduces human intervention, ensures consistent filling, and improves
overall production speed.
Aim
The main aim of this project is to design and implement an
automated water bottle filling system using a PLC and conveyor belt to achieve
efficient, accurate, and continuous bottle filling.
Objectives
To automate the bottle filling process using PLC.
To reduce manual labor and human error.
To ensure accurate and consistent filling of water.
To increase production efficiency.
To develop a reliable and cost-effective industrial
solution.
System Components
The system consists of the following main components:
PLC (Programmable Logic Controller) – Controls the entire
operation.
Conveyor Belt – Moves bottles from one stage to another.
Sensors (Proximity/Photoelectric) – Detect the presence of
bottles.
Solenoid Valve – Controls water flow.
Water Pump – Supplies water to the system.
Motor – Drives the conveyor belt.
Power Supply – Provides required electrical energy.
Control Panel – Interface for system operation.
Working Principle
The system works on the principle of automation using PLC
logic. When a bottle is detected by a sensor on the conveyor belt, the PLC
stops the conveyor and activates the solenoid valve to fill water into the
bottle. After a predefined time or level, the valve closes, and the conveyor
resumes movement to bring the next bottle.
PLC Ladder Logic
Start/Stop Control (Rung 1–2)
The system begins with a START push button and a STOP push
button.
When START is pressed:
Relay R0 is energized.
R0 acts as a holding (latching) contact to keep the system
ON.
When STOP is pressed:
The circuit breaks and the system turn OFF.
Purpose: To control
the overall ON/OFF operation of the system.
Conveyor
Motor Control (Rung 3–6)
When R0 is ON, the system becomes active.
A timer (TON_1.0) is used to delay motor operation.
If no alarm condition exists:
The MOTOR turns ON.
The motor drives the conveyor belt, moving bottles forward.
Purpose: To control
conveyor movement with timing and safety conditions.
Bottle Detection
& Filling Valve Control (Rung 7–12)
When a bottle reaches the filling station:
Sensor signal activates logic via R0 and TON_1.0.
Timer (TON_2.0) is triggered:
The VALVE opens to fill water.
After preset time:
Valve closes automatically.
Purpose: To ensure
bottles are filled for a fixed duration.
Level
Detection Logic (Rung 14–18)
A LEVEL sensor checks if the bottle is properly filled.
If the required level is reached:
Relay R1 is activated.
Timer (TON_3.0) may add delay for stability.
Purpose: To avoid
overfilling or underfilling.
Bottle
Counting System (Rung 20–24)
A CTU (Counter Up) block counts filled bottles.
Each completed filling cycle increments the counter.
Counter value (CV) increases until it reaches preset value
(PV).
Purpose: To track
production quantity.
Counter
Comparison Logic (Second Image)
GT (Greater Than) blocks compare counter values:
If count > 1 → activates COUNT2
If count > 2 → activates COUNT3
If count > 3 → activates COUNT4
Purpose: To trigger
actions based on number of bottles filled.
- Alarm & Buzzer System (Last Rung)
When certain conditions are met (e.g., count limit or level
issue):
ALARM is activated.
BUZZER turns ON.
Controlled using relays like R3 and counter outputs.
Purpose: To notify
operator of system status or faults.
Overall
Working Summary
Press START → System turns ON
Conveyor (MOTOR) starts moving bottles
Sensor detects bottle → Conveyor stops
Valve opens → Bottle fills
After time → Valve closes
Level checked → System confirms filling
Counter increments bottle count
Conveyor restarts for next bottle
Alarm triggers if limits reached
Advantages
High accuracy in filling
Reduces labor cost
Increases production speed
Minimizes water wastage
Reliable and consistent operation
Easy to operate and maintain
Applications
Bottled water industries
Beverage manufacturing plants
Pharmaceutical liquid filling
Food processing industries
Chemical industries
Conclusion
The PLC-based automatic water bottle filling conveyor system
is an efficient and reliable solution for modern industries. It enhances
productivity, ensures precision, and reduces manual effort. With increasing
demand for automation, such systems play a vital role in improving industrial
processes and achieving high-quality output.