Basic PLC Ladder Programming Examples 1


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:

Detecting the standing bottles on the
conveyor and pushing falling bottles in tray.

 
PLC LADDER Programming Practice Problems 1

Topics Covered in this example is using Contacts in series.

Number
of PLC Inputs Required

X0 – Proximity Sensor to sense bottom
of the Bottle i.e. X0 = ON when the     detected
input signal from the bottle-bottom is sheltered.
X1 – Proximity Sensor to sense upper
part of the Bottle i.e.
X1 = ON when the detected input signal from the bottle-neck is
sheltered.  

Number
of PLC Outputs Required

Y0 – To operate Pushing Cylinder/Rod

PLC Ladder Programming:

PLC LADDER Programming Practice Problems 1
 

PLC Ladder Program Description:

  •    
    If the bottle on the conveyor belt is upstanding, the input signal from
    monitoring photocell at both bottle-bottom and bottle-neck will be detected. In
    this case, X0 = ON, and X1 = ON. The normally open (NO) contact X0 will be
    activated as well as the normally closed (NC) contact X1. Y0 remains OFF and
    pneumatic pushing pole will not perform any action. 
  •       
    If the bottle from the conveyor belt is down, only the input signal from
    monitoring photocell at the bottle-bottom will be detected. In this case, X0 =
    ON, X1 = OFF. The state of output YO will be ON because the NO contact X0
    activates and the NC contact X1 remains OFF. The pneumatic pushing pole will
    push the fallen bottle out of the conveyor belt.

Note: Example is only for training
purposes. No practical implementation is done.


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