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CH 6 - Selection of an interlocking device

Last edit: 03/03/2023

When selecting an interlocking device for a machine, it is necessary to consider all phases of the machine life cycle.

Some provided selection criteria are:

  • The conditions of use and intended use of the machine;
  • The hazards present at the machine;
  • The severity of the possible injury;
  • The probability of failure of the interlocking device;
  • Overall system stopping performance and access time;
  • The required PL or SIL for the safety function;
  • Information for use provide for the interlocking device;
  • For type 4 interlocking devices the means to avoid that a single actuator can be taught in an unlimited manner by the operator without special knowledge and tools.

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