Palletizer (Simple)

Briefing

A simple layer-based palletizer. Cases arrive at a pick station, are indexed to pattern positions within a layer (5 cases per layer), then the layer lift rises to allow the next layer to be placed. After 3 layers the pallet is ejected. The operator starts/stops the cycle via push-buttons and PATTERN_SELECT chooses the arrangement.

Objectives

• PICK_ACTUATOR fires when CASE_AT_PICK is asserted and the system is running
• INDEX_CONVEYOR indexes the case to the next pattern position after each pick
• After 5 cases, LAYER_LIFT raises and the case counter resets for the next layer
• After 3 layers, PALLET_EJECT fires and layer count resets
• READY_LAMP is lit when the system is running and not faulted
• STOP_PB stops the cycle cleanly at any point

I/O Table

Your program will be tested against:

All test cases run automatically when you submit. Assertions are hidden until you pass.

1. #1Start energises system, READY_LAMP on

   START_PB sets the run bit and READY_LAMP illuminates

2. #2PICK_ACTUATOR fires on CASE_AT_PICK

   When running and a case arrives, PICK_ACTUATOR asserts and INDEX_CONVEYOR follows

3. #3LAYER_LIFT fires after 5 picks

   Physics counts 5 case picks then signals layer complete

4. #4PALLET_EJECT fires after 3 layers

   Three complete layers trigger pallet ejection