in Programmable logic controllers(plc)

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Using Siemens SIMATIC Step 7 program, write a PLC LAD program to control the stations shown in the figure and described below: Bottles of two different heights are being transferred on a conveying system. They pass a station with 2 proximity sensors (x2,x3) arranged to differentiate the two sizes, such that each size is packaged in a different box at their associated station. At each station, a linear solenoid ejector pushes the bottie then retracts to the initial position. Note that each ejector has 2 limit switches to delect its fully retracted and fully advanced positions. Also note that the fravel time from sensor station to first packaging station is 10 seconds, then 10 more to the second packaging station