Question

please help me write PLC programming, im having trouble doing it. 

·         The Bottle Size selector switch will determine how much to fill up the bottles and how many bottles go into a box.  When the selector switch is on then Large bottles are being made - filled for 4.50 seconds and 6 go into a box.  If the selector switch is off then Small bottes are being made – filled for 3.00 seconds and 12 go into a box.

·         When the NO Start PB is pressed the Feed Motor conveyor begins transporting bottles to the filling station.

·         When the NO Limit Switch detects a bottle in position the conveyor stops and the Solenoid will turn on to start filling the bottle. (1)

·         The bottle will fill for X seconds - determined by the Bottle Size selector switch, you must use the move command to change this value. (2)

·         When the bottle is filled the Solenoid will turn off and 0.50 seconds later the Feed Motor will start again to bring in the next bottle. (1)

·         Also after the 0.50 seconds the Outfeed Motor will turn on for exactly 3 seconds in total to move the bottle down the conveyor.  When the next bottle is filled it will start again for another 3 seconds, this will keep the bottles evenly spaced on the conveyor. (1)

·         Include counts of the Total Large Bottles filled and of the Total Small Bottles filled. (1)

·         Include a count of Total Small Bottle Cases, and Total Large Bottle Cases. (1)

·         Use a NC Emergency stop to shut down everything when it is pressed.

·        A NO Reset PB will reset all counters back to zero. 

1.            Draw the I/O electrical schematic based on the I/O configuration below.

2.            Write a PLC program that completes the lab requirements, you MUST use the Latch/Unlatch command to indirectly control all outputs.  (-5 marks for not using Latch/Unlatch)