Failsafe

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Failsafe

• Better safe than sorry

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Definition of 'fail-safe'
A fail-safe device in a nuclear weapon to
deactivate it automatically in the event of
accident"

• 1. (noun) fail-safe a mechanism capable of
  returning to a safe state in case there is a
  failure or malfunction
• 2. (adj) fail-safe guaranteed not to fail
• 3. (adj) fail-safe eliminating danger by
  compensating automatically for a failure or
  malfunction

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Fail-safe operation

• 1. Operation that ensures that a failure of
  equipment, process, or system does not propagate
  beyond the immediate environs of the failing
  entity
• 2. A control operation or function that prevents
  improper system functioning or catastrophic
  degradation in the event of circuit malfunction
  or operator error.

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Back to Basics

• An Industrial building is to be equipped with a
  fire alarm system, activated by any one of
  several latching switches installed throughout
  the facility.
• Simple right??
• But What if

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A Failsafe approach..

• The same problem can be solved this way..

Only difference.
The goal of fail-safe design is to make a control
system as tolerant as possible to likely wiring
or component failures.
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Why be Fail-safe

• Chernobyl Incident
• A group of single-minded but non-nuclear
  engineers directing a team of dedicated but
  over-confident operators. Each group probably
  assumed that the other knew what it was doing.
  And both parties had little or no understanding
  of the dangers they were courting, or of the
  system they were abusing
• Errors and Procedural violations resulted into a
  tragedy

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The impact
Massive OR Impressive?
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HISTORY

• Failsafe systems, which control potentially
  hazardous operations to ensure they are shut down
  if faults occur, have in the past traditionally
  been hard-wired installations.

• Serious drawbacks of hard-wiring approach
• An inherent inflexibility
• Lack of data communications facilities

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We Step in..

• These are prompting a growing move towards using
  specialized systems based on programmable logic
  controllers (PLCs) that are tailor-made for
  failsafe applications.

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Thank You

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