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