Automatic overhead tank system.

Automatic overhead tank system.

Application:-Make automatic system for overhead tank in the house. Provide PLC based automatic system so it can control motor as per water requirement. 

Explanation:-

Generally in home we are using overhead tank for water supply in the house. But mostly we are using manual system to fill the tank, in this system we need to check tank level physically and start/stop the motor. So by this application we will make automatic system so it can fill tank as per the level of the tank.

PLC program:-

Write the ladder program for above application using ladder diagram language. Here for ladder logic we can use any supported PLC system like S7-1200, S7-300, S7-1500 or any other PLC which can support this instruction. For PLC logic we need digital inputs and outputs.

For our application start/stop switch and buttons are digital inputs and pump is the digital output. So define digital input address and output address as per below explanation,

 

Digital inputs:-

Start=I0.0

Stop=I0.1

Trip=I0.2

High Level=I0.3

Low level=I0.4

Digital Output:-

Pump=Q0.0

PLC program Explanation:-

In network 1, we have written start/stop logic in this network. When start button is pressed, memory coil will be latched. We have used latching circuit for this so circuit will be latched automatically.

In network 2, in this network we have used pump operation so when low level is detected then pump will be on and if high level detected then pump will be off automatically.

If cycle stop button is pressed during operation, cycle will be off.

If motor trip during the operation, cycle will be off.