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Series Tanks Level Control using PLC Ladder Programming

Series Tanks Level Control

We need to control level of tanks which are connected in series. Implement program for Series Tanks Level Control using PLC Ladder Programming.

Problem Description

Two tanks are connected in series connection. We need to control of both tanks which are connected in series.

Implement the PLC program for this application.

Problem Diagram

PLC Program to Control Level of Series Tanks

Problem Solution

  • In chemical companies there are lots of materials which are used for process and also stored in storage tanks for different processes.
  • Here we consider two tanks, 1. Storage Tank and 2. Feeder Tank.
  • Storage tank has more capacity than feeder tank. Storage tank is for material storage and feeder tank is for material supply for other process.
  • Two level switches are used for level detection and one inlet valve for material feeding control.
  • Consider one manual outlet valve and it can be operated as per requirement by the operator.
  • For this application we can use PLC, we will write PLC program for this application.

List of inputs/outputs

Digital Inputs

  • Cycle START :- I0.0
  • Cycle STOP :- I0.1
  • Low level storage tank (LL1) :- I0.3
  • Low level feeder tank (LL2) :- I0.4
  • High level storage tank (LH1) :- I0.5
  • High level feeder tank (LH2) :- I0.6

Digital Output

  • Inlet valve :- Q0.0

M memory

  • Cycle ON bit :- M0.0
  • Inlet valve close condition :- M0.1

PLC Ladder diagram for Level control of Series Tanks

PLC Ladder Series Tank PLC Tank Ladder Program Series Tank PLC Logic

Program Description

For this application we used S7-300 PLC and TIA portal software for programming. We can implement this logic by using other PLC also.

Network 1 :-

Network 1 is for latching circuit. Whenever START button is pressed (I0.0), Cycle ON (M0.0) bit will be ON. Cycle can be STOP by pressing STOP PB (I0.1).

Network 2 :-

If low level of storage tank (I0.3) or low level of feeder tank (I0.4) is detected, inlet valve (Q0.0) will be ON. (Inlet valve close condition should not present).

Network 3 :-

High levels (I0.5 &I0.6) of both tanks are detected, inlet valve close condition will be activated and it will close the inlet valve (Q0.0). Here outlet valve is manual valve, it can be operated by operator as per requirement.

Note :- Above application may be different from actual application. This example is only for explanation purpose only. We can implement this logic in other PLC also.

Runtime Test Cases

Series Tank Ladder Logic

Author : Bhavesh

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