Problem Description

Runtime Test Cases
Input
Output Physical Elements
I:1 = 65536
N7:0 = FFFFh
Store input to register
I:1 = 65536
N7:1 = 03F0h, O:6 = 1008(In cm)
Displays 1008cm on the screen
I:1 = 32768
N7:1 = 01F8h, O:6 = 504(In cm)
Displays 504cm on the screen
PLC Program to Drain Two Different Products from 2 Tanks
This is a PLC Program to Drain Two Different Products from 2 Tanks.
Problem Description

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There two different tanks which are to be operated. Draining of these two materials are controlled. Mixing
in the ratio of 2:1 is to be done. Implement automation of this in PLC using Ladder Diagram programming
language.
Problem Diagram
Diagram
 
showing
 
mixing
 
of
 
two
 
materials
 
continuously
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.

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
Centrifugal pumps are used to drain material from both the tanks at the same time.

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 Two Different Products from 2 Tanks, along with program explanation and
run time test cases.
List of Inputs and Outputs
I:1/14 = Start
(Input)
I:1/15 = Stop
(Input)
O:2/15 = Master Coil
(Output)
O:4
= Output to I-V converter of Pump1
(Output)
O:6
= Output to I-V converter of Pump2
(Output)
O:2/0
= Agitator to mix
(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)
N7:3
= Division to obtain 2:1 ratio
(Register)

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