PLATE 12 OF 20
Control systems and functional safety.
Safety related control functions, stopping, starting, and failure behaviour.
Pillar guide
Safety related control systems, overview: Control functions that carry safety, and how their design, failure behaviour, and verification are recorded.
Supporting guides
| Guide | What it covers |
|---|---|
| Starting, stopping and restart | Start, stop, and restart behaviour designed so a machine cannot start unexpectedly or restart after a stop. |
| Emergency stop functions | Emergency stop as a protective measure, its placement, and its limits, distinct from normal stopping. |
| Control failure behaviour | What a safety related control system does when a component fails, and how that behaviour is verified. |
| Software in safety related controls | Software that carries safety functions, and the verification that shows it behaves as specified. |
| Operating modes and mode selection | Modes for normal work, setting, and maintenance, and how mode selection prevents unsafe combinations. |
| Power loss and restoration | Behaviour on power loss, and controlled restoration, so a machine does not restart or release energy unsafely. |
| Control interfaces and human factors | Controls that are identifiable, reachable, and understandable, so the operator can act correctly under pressure. |
| Verifying control systems | Verification that covers normal operation, failure, mode selection, and emergency functions as one plan. |
| Documenting control systems | Drawings, specifications, and test records that let a reviewer follow a safety function from requirement to evidence. |