Problem Description

Problem Description
Two tanks have same products filled. Draining from these depends on the requirement from the storage
tank. Implement automation of this draining system in PLC using Ladder Diagram programming language
Problem Diagram

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Diagram
 
showing
 
draining
 
through
 
pumps
Problem Solution

Level gauge is used to measure level of the storage tank continuously

Level gauge is connected with Level Transmitter which converts corresponding level output in 4-20mA
equivalent.

Analog I/O Modules are chosen to deal with Analog signals.

Centrifugal pumps are used to drain material from both the tanks at the same time.

Two low level switches are used to detect low level of tanks 1 and 2 which turns Pumps OFF when low level
is reached.

Height of storage tank is 5meters that is 500cm and the level which is to be maintained is 470cm.

Calculate necessary conversions and use registers to store data and to do arithmetic operations.
PLC Program
Here is PLC program to Drain Same Products from 2 Tanks, along with program explanation and run time
test cases.
List of Inputs and Outputs

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 I:1/14 = Start
(Input)
I:1/15 = Stop
(Input)
O:2/15 = Mater Coil
(Output)
I:1/0
= LLS of Tank1
(Input)
I:1/1
= LLS of Tank2
(Input)
O:4
= Output to I-V converter of Pump1
(Output)
O:6
= Output to I-V converter of Pump2
(Output)
I:3
= Input to which transmitter is connected
(Input)
N7:0
= Register to store input data
(Register)
N7:1
= answer of division by value change per centimeter
(Register)
N7:2
= Multiplication answer
(Register)