Shut is not start
Interlock the cell gate: opening it stops the robot, and shutting it starts nothing.
Stop the robot the moment the gate opens, and prevent any restart until the gate is shut and someone outside presses Reset and then Start.
Training only. This is not a certified safety system. On a real machine these rules run in a safety relay or a safety PLC, designed and validated to ISO 13849-1 or IEC 62061.
Pro missionOpen stops, shut starts nothing
Test 1 of 4StartInputOFFResetBlue Reset button, outside the fenceOFFOpenGateInputOFFK1Contactor K1: ON closes it (power to the drive)ON- Level
- Applied
- Time
- About 25 min
- Reward
- +300 XP
- Rig
- 3D robot safety cell
- Siemens editors
- Ladder (LAD), SCL
- Rockwell editors
- Ladder, Structured Text
- Beckhoff editors
- Structured Text
- Course stage
- 32. Safety lab 1: stop, and restart only on purpose
What the tests check
- Opening the gate switches K1, K2 and DriveRun OFF in the same .
- Shutting the gate restarts nothing.
- Reset is ignored while the gate is open or the E-stop is in.
- After Reset, only a fresh Start sets DriveRun.
- ResetLamp shows when the cell is shut, clear and needs a reset.
- 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
Robot cells, packing machines and machine tools all have interlocked doors. Shutting the door only allows a reset from outside.
A fitter inside can be hidden behind the robot. If shutting the gate restarted it, a colleague closing the gate would start the arm on top of them.
A robot stacks cartons inside a fence. A gate lets a fitter in, a light curtain lets the cartons in, and an emergency stop sits outside. Two contactors in a row cut the robot's power, so one that sticks cannot keep it running.
- InfeedCartons through the curtain
- PickRobot takes the carton
- GuardStop, reset, restartYou are here
- PalletSix cartons, then change
On a real site: places, parts and safety
- Robot palletising and packing cells
- Machine tending: robots loading presses and machine tools
- Any guarded machine with a door, a curtain or an E-stop
Training only: this rig is not a certified safety system. Real safety functions run in safety relays or a safety PLC, designed and validated to ISO 13849-1 or IEC 62061.
IEC 60204-1 sets out stop categories 0, 1 and 2 and how an emergency stop must behave. Which category a machine uses comes from its risk assessment.
The sizes, timings and cutaways are teaching choices, not a drawing of any one real installation.
Next in the course
64Two channels must agreeRead the E-stop and the gate on two channels each, and lock the cell out when a pair disagrees.Advanced · 40 min · +450 XP
65Both hands, checked twiceAdd checked palm buttons, an emergency stop and a reset to the two-hand press.Advanced · 45 min · +500 XP- 66Prove the contactors let goCheck the contactors' mirror contacts, and refuse a reset while one is welded shut.Advanced · 40 min · +450 XP
- 67Stop dead or slow downMake the E-stop a category 0 stop and the gate a category 1 stop: brake first, then cut the power.Advanced · 40 min · +500 XP