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The chief value of hardware in the loop testing is that it allows

  • A.the firmware to be tested before it is written
  • B.the plant to be dispensed with in production
  • C.the controller's own timing requirements to be relaxed a little
  • D.dangerous and rare conditions to be tested repeatedly

Answer: D

Correct answer: dangerous and rare conditions to be tested repeatedly

Hardware in the loop runs the real controller against a simulated plant, so a fault condition that would destroy equipment or endanger someone can be injected as often as required, and a rare combination can be reproduced exactly. It also lets testing begin before the real plant exists, which is often what makes the schedule work.

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