Problem Description



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PLC-4

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


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.



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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