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Inst Tools > Blog > PLC Tutorials > PLC Programming for 3 Motors control in Ladder logic

PLC Programming for 3 Motors control in Ladder logic

Last updated: March 4, 2021 2:38 pm
Editorial Staff
PLC Tutorials
3 Comments
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Write the PLC Programming Motors logic for the following problem.

Contents
PLC Programming MotorsProgram Description:Program Output:When M1 turns ON,When M1 & M2 turns ONWhen the Third motor Turns ON,Conclusion:
  1. There are three motors (M1, M2 & M3), having a separate start and stop push button.
  2. M1 must be running before starting of M2 and M3 motor.
  3. M2 and M3 can start and stop without affecting M1 operation.
  4. Only two motors can run at the time. Starting of the third motor will shut down all the outputs immediately irrespective of its input.

PLC Programming Motors

PLC Programming for 3 Motors control in Ladder logic
PLC Programming Motors control
Example PLC Program for Motor

Program Description:

Rung 0000:

Start/Stop PB latched with memory B3:0/0 for Motor 1.B3:0/3 is connected in series with latch memory to turn off all motors.

Rung 0001:

Start/Stop PB latched with memory B3:0/1 for Motor 2 .B3:0/0 is connected in series to turn on M2 only after M1.

Rung 0002:

Start/Stop PB latched with memory B3:0/2 for Motor 3 .B3:0/0 is connected in series to turn on M3 only after M1.

Rung 0003:

Turning on M1 when B3:0/0 turns ON

Rung 0004:

Turning on M2 when B3:0/1 turns ON

Rung 0005:

Turning on M3 when B3:0/2 turns ON

Rung 0006:

M2 and M3 outputs are connected in series to enable B3:0/3

Program Output:

When M1 turns ON,

PLC Motor Control Circuit Example

When M1 & M2 turns ON

Ladder Logic for Motor Control
Basic Motors Control using Ladder Logic

When the Third motor Turns ON,

Motor Ladder Diagrams

Conclusion:

We can use this example to understand the programming logic in Allen Bradley PLC.

Author: Hema Sundaresan

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3 Comments
  • Himangshu kumar Biswas says:
    January 14, 2020 at 2:10 pm

    Thanks.

    Reply
  • REGGIE AKUTA says:
    February 4, 2024 at 7:56 am

    I know it’s been four years since this post of 3 motors. It seems that your third motor is not turning all out puts off.

    Reply
  • Leo says:
    July 18, 2024 at 9:41 am

    Write the plc logic for the following conditions
    There are three motor m1 m2 m3 having a separate Start and stop push button
    m1 must be running before starting of m2 m3 motor
    Only one motor run at time

    Reply

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