工業現場控制屬于強實時系統還是弱實時系統？為什么

Laura哦呵呵

大家好，最近老師留了個題目（如題)，我搜了一些回答，但還是不太理解，請大家幫忙點撥一下。謝謝！

ITALPLANT精密輸送系統

A system is said to be real-time if the total correctness of an operation depends not only upon its logical correctness but also upon the time in which it is performed. Real-time systems, as well as their deadlines, are classified by the consequence of missing a deadline:

Hard – missing a deadline is a total system failure.
Firm – infrequent deadline misses are tolerable but may degrade the system's quality of service. The usefulness of a result is zero after its deadline.
Soft – the usefulness of a result degrades after its deadline, thereby degrading the system's quality of service.

魍者歸來

工業現場控制，這個范圍太大了。