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Reading: PLC Programming for Tank Heating Control using Heater
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Inst Tools > Blog > PLC Tutorials > PLC Programming for Tank Heating Control using Heater

PLC Programming for Tank Heating Control using Heater

Temperature Control using PLC. Implement Logic for PLC Tank Heating Control using ladder diagram language and simulate the process.

Last updated: November 3, 2023 2:39 pm
Editorial Staff
PLC Tutorials
4 Comments
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This is a PLC Program for heating liquid in the tank by heater.

Contents
Tank Heating ControlProblem DiagramProblem SolutionInputs/Outputs ListPLC Program for heating liquid in the tank by heaterLogic DescriptionResult

Tank Heating Control

Problem Description

Controlling the heating process for the liquid in the tank.

Implement a PLC program for this application using ladder diagram language.

Problem Diagram

PLC Program for Tank Heating Control using Heater

Problem Solution

In this system, we will consider S7-300 PLC and TIA portal software for programming.

In this system two sensors are used for level measurement in the tank, heater is used for material heating purposes in the tank.

We used a temperature sensor (it can be RTD or thermocouple) also for temperature measurement in the tank.

Two valves are used for the material inlet and outlet. The inlet valve is used for feeding the tank and the outlet valve for discharging the tank.

If the system detects a low level, the system will start to feed the tank. The feeding cycle will be OFF when the tank detects a high level.

After the high-level, the system will start the heating process till set temperature.

Inputs/Outputs List

Inputs List

  • START PB :- I0.0
  • STOP PB :- I0.1
  • Low level switch :- I0.4
  • High level switch :- I0.3

Outputs List

  • Inlet valve :- Q0.0
  • Heater :- Q0.1
  • Outlet valve :- Q0.2

Memory List

  • Master coil :- M0.0
  • Actual temperature :- MW12
  • Set temperature :- MW14

PLC Program for heating liquid in the tank by heater

PLC Logic for Heater 1
PLC Tank Heating Control
PLC program for heating liquid
heating liquid in the tank

Logic Description

Network 1:

Master coil (M0.0) will start when START PB (I0.0) will be pressed and cycle can be stopped by pressing STOP PB (I0.1).

Network 2:

When low level switch (I0.4) is detected, inlet valve (Q0.0) will be ON.

Network 3:

When high level switch (I0.3) is detected, heater (Q0.1) will be ON.

Network 4:

If actual temperature (MW12) is greater than set temperature (MW14), outlet valve (Q0.2) of the tank will be ON.

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. This is the simple concept of heating the material in the tank as per requirement in industry, we can use this concept in other examples also.

All parameters considered in example are for explanation purpose only, parameters may be different in actual applications. Also all interlocks are not considered in the application.

Result

PLC Logic for Heater

Author: Bhavesh

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4 Comments
  • Malvern Jones says:
    October 28, 2018 at 6:57 pm

    The above example is a very crude example of “temperature control” as the temperature of the liquid will not be controlled at the set value. It will instead rise above the set point and fall below the set point.

    The variation between the highest and lowest temperatures that will be experienced will depend on the power rating of the heater, compared to the cooling of the vessel. It true temperature control is required, then PID temperature control should be used in the program.

    Reply
  • Jairo Francisco Oliveira Paula says:
    August 13, 2019 at 4:12 am

    I have no experience but I would like to create simulator supervisors and use this example for academic purposes .. thank you very much

    Reply
  • BISWANATH says:
    July 16, 2021 at 10:44 am

    ITS NOT WORKING AS PPER the ladder diagram.
    the nt:-2 the o/p will dependent upon high level sensor :”Q0.0″

    Reply
  • Negussie says:
    November 17, 2021 at 2:19 pm

    Thank you it helps me a lot.

    Reply

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