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Basic PLC Ladder Programming Training Examples for Beginners.

 Hi friends here we are starting here a series of Free Training on PLC Ladder Programming training & tutorials.These PLC Ladder Programs are important to get basics of Ladder programs.







 PLC Ladder Practice Problem:

           Controlling the running state of the 1 ph motor by pressing START and STOP pushbuttons i.e. motor should remain in ON state after START pushbutton is pressed and should OFF when STOP pushbutton is pressed. Checking if the Motor is running normally by pressing TEST pushbutton.



PLC Ladder Programming Practice Problem 3



Topics Covered in this example is Latching Contacts Ladder Program.

  Number of PLC Inputs Required

X0 – START pushbutton to Start Motor

X1 – STOP pushbutton to Stop Motor

X2 – Error signal from Motor to PLC.

  Number of PLC Outputs Required
 
Y0 –1 phase Motor


PLC Ladder Programming:


PLC Ladder Programming Practice Problem3

PLC Ladder Program Description: 


  1. Press START button lightly and X0 = ON. The Motor will keep running if no error occurred (X3 = OFF). The action can be practiced by a latching circuit which takes output Y0 as one of the input condition to keep the motor running even if the START button is not pressed(See normally open contact Y0 below X0).
  2. When STOP button is pressed, X1 = ON and Y0 = OFF. The motor will stop running.
  3. If error occur (X3 = ON), Y1 will be OFF and the motor will stop running.
  4. When TEST is pressed (X2 = ON), Y0 = ON. The motor will start running if no error occurred (X3 = OFF). On the contrary, when TEST is released, the motor will stop running. The testing function is performed by this process.    


Post a Comment

UBERDAM JUNIOR Cavaletti said... 9 December 2016 at 17:12

The PLC program above don´t work ??

When i pressed Button Test the motor working, but when i left the button, the motor will keep running.

kyaw lwin 89 said... 25 January 2017 at 16:32

the reason is when the motor start running, Y0 contact will energize too. Thus, Even thought you release the Test button (Test contact de-energize), Motor still has electrical connection from Y0 Contact.

The solution is normally close Test contact must add in serial connection to Y0.

kyaw lwin 89 said... 25 January 2017 at 16:32

the reason is when the motor start running, Y0 contact will energize too. Thus, Even thought you release the Test button (Test contact de-energize), Motor still has electrical connection from Y0 Contact.

The solution is normally close Test contact must add in serial connection to Y0.

kyaw lwin 89 said... 25 January 2017 at 16:33

the reason is when the motor start running, Y0 contact will energize too. Thus, Even thought you release the Test button (Test contact de-energize), Motor still has electrical connection from Y0 Contact.

The solution is normally close Test contact must add in serial connection to Y0.

Nitish Goel said... 26 March 2017 at 00:40

Even after adding normally close test button in serial connection to Y0 the motor keeps on running as one the motor is on due to test connection, normally close connections keeps it on and do not interfere in the holding provided to y0.

Either this question is wrong or there is a much complicated solution.

SOUNDHARYA K said... 4 November 2017 at 22:13

Design a PLC program to operate a light according to the following sequence
A momentary push button is pressed to start the sequence.
The light is switched on and remains ON for 2 sec.
The light is switched off and remains OFF for 2 sec.
A counter is incremented after this sequence.
The sequence then repeats for a total of 4 counts.
After the fourth count the sequence will stop and counter is reset

SOUNDHARYA K said... 4 November 2017 at 22:13

I neeed solution for this problem

Unknown said... 4 February 2018 at 12:19

I need ladder logic for this condition using comparator operation blockwith timer the condition is switch on light on for 2second and off for 2 second and the timer get increase to 4second on and 4second off and timer get increase for 6seconds on and 6seconds off after 6seconds it will go on reverse like 6seconds on 6seconds off 4seconds on 4seconds off 2seconds on 2seconds off

 
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