The Safety Manual - The IEC 61508 and IEC 61511 Standards
Revision 1.9 HC900 Process & Safety Controller Safety Manual 3
01/14
Generic standard
The standard is generic and is intended to provide guidance on how to develop E/E/PE safety related
devices as used in Safety Instrumented Systems (SIS). The IEC 61508:
•
serves as a basis for the development of sector standards (e.g. for the machinery sector, the process
sector, the nuclear sector, etc.)
•
can serve as stand-alone standard for those sectors where a sector specific standard does not exist.
SIL
IEC 61508 details the design requirements for achieving the required Safety Integrity Level (SIL). The
safety integrity requirements for each individual safety function may differ. The safety function and SIL
requirements are derived from the hazard analysis and the risk assessment. The higher the level of adapted
safety integrity, the lower the likelihood of dangerous failure of the SIS. This standard also addresses the
safety-related sensors and final elements regardless of the technology used.
IEC 61511, the standard for the process industry
The IEC 61511 is called “Functional safety - Safety instrumented systems for the process industry sector”.
It is also referred to as the ANSI/ISA 84.00.01.
This standard addresses the application of SISs for the process industries. It requires a process hazard and
risk assessment to be carried out, to enable the specification for SISs to be derived. In this standard a SIS
includes all components and subsystems necessary to carry out the safety instrumented function from
sensor(s) to final element(s). The standard is intended to lead to a high level of consistency in underlying
principles, terminology and information within the process industries. This should have both safety and
economic benefits.
The IEC 61511 sits within the framework of IEC 61508.
For more information regarding, or help on, implementing or determining, the applied safety standards for
your plant/process please contact your Honeywell affiliate.
Our Safety Consultants can help you to:
•
perform a hazard risk analysis
•
determine the SIL requirements
•
design the Safety Instrumented System
•
validate and verify the design
•
train your local safety staff
To Next Page
Loading...
