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.
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| 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:
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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.
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