| 摘要 |
<p>The invention relates to the maintenance of safety devices. Valves and simil ar automatic mechanical safety devices normally maintaining a fixed position are in danger of getting stuck, and consequentl y may not be fully operable in an emergency situation. In a system according to the invention, real-time data indicating the operability of, for example, a valve actuator, is provided. When a fault is discovered, it can be localized using online diagnostic tools. A standby state is continuously maintained, as the unit for activating the safety function is independent of the unit for monitoring the operability, a nd the latter is bypassed in an emergency situation.</p> |
