Basic PLC Ladder Programming Examples 4

Basic PLC Ladder Programming Examples 4 for Beginners.


Basic PLC Ladder Programming Examples 4: 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 diagram. PLC Ladder Programming

 PLC Ladder logic Problem: 

Providing lubricant for the gear box before the lathe spindle starts to run which aims to ensure that the oil pump motor starts first and the main motor starts subsequently. (plc ladder diagram)

PLC Ladder Programming Practice Problem4 (plc ladder diagram)



Topics Covered in this example is Conditional Contacts Ladder Program ( plc ladder logic)

Number of PLC Inputs Required

X0 – START pushbutton to Start Oil Pump Motor
X1 – START pushbutton to Stop Main Motor
X2 – STOP pushbutton to Stop Oil Pump Motor
X3 – STOP pushbutton to Stop Main Motor


Number of PLC Outputs Required

Y0 – Oil Pump Motor
Y1 – Main Motor

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PLC Ladder Programming:

PLC Ladder Programming Practice Problem 4  plc ladder diagram

PLC Ladder Programming Description:

  •      This program is a typical application of the conditional control
    circuit. Y0 = ON when Oil Pump START button is pressed. Therefore, the oil pump
    will start to provide lube for the gear box of main motor(Y1)
  •       Under the precondition of the operating state of the Oil pump, the main
    motor (Y1) will be ON when the Main motor START button is pressed.
  •        During the operation of main motor (Y1), oil pump (Y0) needs to provide
    lube continuously.
  •       The oil pump will be stopped when Oil pump STOP button X2 is activated, and
    the main motor will be stopped when Main motor STOP button X3 is
Note: Example is only for training
purposes. No practical implementation is done.
 See More PLC Ladder Programming Examples

List of PLC Programming Examples

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