PLC Program Example – Paint Spraying

We will now look at the paint spraying PLC program example. The development of the PLC logic will be discussed by applying the five steps to PLC Program development. Paint spraying system where boxes are fed by gravity through a feeder magazine one at a time onto a moving conveyor belt. Upon the start signal, boxes are pushed towards the conveyor by valve 1. This is a cylinder that extends and retracts which operates switches S1 and S2 respectfully. A spraying nozzle paints each box as it passes under the paint spray controlled by valve 2. A sensor (S3) counts each box being sprayed. When 6 boxes have been painted the valve 2 shuts off (paint spray) and valve 1 (cylinder) stops moving boxes onto the conveyor. Three seconds later the conveyor stops moving and the hopper with its load moves forward (valve 3) where it is emptied. Ten seconds later the hopper returns to the original position. The cycle is then complete and waits for a start signal again. 1.Define the task 2.Define the inputs and outputs 3.Develop a logical sequence of operation 4.Develop the PLC program 5.Test the program More information can be obtained at our website. https://accautomation.ca/plc-programming-example-paint-spraying/ https://www.accautomation.ca