Stop before the pallet
Open and close a door that reverses for obstructions.
Run the door from three buttons, and make it refuse to close, or reverse, whenever the doorway is not clear.
Pro missionOpen fully, close fully
Test 1 of 4OpenPBOpen pushbuttonOFFClosePBInputOFFOpenLimitInputOFFMotorUpOutputOFF- Level
- Applied
- Time
- About 20 min
- Reward
- +300 XP
- Rig
- 3D roller shutter door
- Siemens editors
- SCL, LAD
- Rockwell editors
- Structured Text, Ladder
- Course stage
- 26. Machine lab 1: real machines, clear rules
What the tests check
- A press of OpenPB opens fully; a press of ClosePB closes fully.
- StopPB stops the door at once and wins.
- ClosePB does nothing while the beam is blocked.
- A broken beam or a pressed safety edge while closing reverses the door to fully open.
- Each direction stops at its limit switch.
- Beacon is ON whenever the door moves; MotorUp and MotorDown are never ON together.
- Try it Use the buttons below the model and watch the rig respond.
- Test solution Every check runs on your code in one press.
- Replay If one fails, step through it one scan at a time to see why.
Where you’d see this on site
Loading bays use exactly this control. Forklift drivers press Close as they drive off, so the door has to look after anyone who follows.
A shutter closing onto a load can crush goods, damage the curtain or injure someone underneath. Doors that ignore their safety devices are a common cause of serious accidents.
Warehouses, loading bays and fire stations all have powered roller shutters. Forklifts drive through them all day, so the control must stop and reopen the door the moment anything is in the way.
- OpenUp to the top limit
- DoorwayForklifts and palletsYou are here
- CloseOnly with a clear beam
On a real site: places, parts and safety
- Warehouse loading bays
- Factory goods-in doors
- Vehicle workshops and fire stations
Real powered doors are assessed against EN 12453 and use safety-rated devices, not just PLC logic.
Test the safety edge and photo-eye regularly: a door that ignores them can crush a person.
The sizes, timings and cutaways are teaching choices, not a drawing of any one real installation.
Next in the course
46Green figure, on timeRun a crossing's six stages with their timers.Applied · 30 min · +350 XP
47Tall boxes off the lineRemember a box's height and push it at the right moment.Applied · 25 min · +300 XP
48Down, grip, up, acrossStep a pick and place through its sequence, every move confirmed.Applied · 35 min · +400 XP
49Both hands, every timeWrite two-hand control for a press, with an interlocked guard.Applied · 30 min · +350 XP