Preparing the published article.
Safety Function Proof Testing
A safety function that is never tested is an assumption.
What to test and record
| Function | Typical test |
|---|---|
| Emergency stop | Trigger and confirm the full stop chain |
| Interlocks | Open each guard and verify the stop |
| Speed or force limits | Measure against the specified limit |
| Light curtains | Test each beam or zone |
| Reset logic | Confirm manual reset from a safe state |
How to do it properly
- Follow a written procedure with expected results.
- Record the date, the tester and any deviation found.
- Re-test after any modification, without exception.
Test intervals and methods follow from the risk assessment and the applicable standards.