Safety

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Principles, Standards, & Implementation

Principles, Standards, & Implementation

ISO (International Organization for Standardization)...................................... 1-8
IEC (International Electrotechnical Commission) ........................................... 1-8
EN Harmonized European Standards ............................................................ 1-8
ISO and ENStandards (Type A) ..................................................................... 1-8
ISO and EN Standards (Type B) ..................................................................... 1-9
ISO and EN Standards (Type C) ..................................................................... 1-9
IEC and EN Standards................................................................................... 1-9
U.S. Standards ............................................................................................. 1-10
OSHA Standards .......................................................................................... 1-10
ANSI Standards ............................................................................................ 1-11
CanadianStandards..................................................................................... 1-12
Australian Standards .................................................................................... 1-13

Safety Strategy

1-13

Risk Assessment ..........................................................................................
Machine LimitDetermination........................................................................
Task and Hazard Identification .....................................................................
Risk Estimation.............................................................................................
Risk Reduction .............................................................................................
Hierarchy of Measures for Risk Reduction..................................................
Inherently Safe Design..................................................................................
Protective Systems and Measures...............................................................
Evaluation .....................................................................................................
Training, Personal ProtectiveEquipment, etc. .............................................
Standards .....................................................................................................

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1-19

1-49

Lockout/Tagout.............................................................................................
Safety Isolation Systems..............................................................................
Load Disconnects.........................................................................................
Trapped Key Systems ..................................................................................
Alternative Measures to Lockout..................................................................

Introductionto Safety-Related Control Systems

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Introduction .................................................................................................. 1-51

Introduction to Functional Safety of Control Systems 1-51
What is Functional Safety?........................................................................... 1-51
IEC/EN 62061 and EN ISO13849-1:2008 ................................................... 1-52
Joint Technical Report on IEC/EN 62061 and EN ISO 13849-1 .................. 1-52
SIL and IEC/EN 62061 ................................................................................. 1-52
PL and EN ISO 13849-1............................................................................... 1-54
Comparison of PL and SIL...
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