Is IEC 61511 mandatory?
In many countries, compliance with IEC 61511 is not mandatory, but it is a great guide of recommendations that is widely recognized worldwide. From here we encourage you to follow it and implement it little by little. Complying with this standard by only 50% is already a good step in the right direction.
Which part of IEC 61511 contain mandatory requirements?
Part 1: Framework, definitions, system, hardware and software requirements. Part 2: Guidelines in the application of IEC 61511-1. Part 3: Guidance for the determination of the required safety integrity levels.
What is hardware fault tolerance in SIL?
‘Hardware fault tolerance is the ability of a component or subsystem to continue to be able to undertake the required safety instrumented function in the presence of one or more dangerous faults in hardware.
What is the latest version of IEC 61511?
IEC 61511-1:2016 is available as IEC 61511-1:2016 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
What is HFT in SIL?
Fault Tolerance for Safety Very generally speaking, the higher the safety integrity Level (SIL) required, the more hardware fault tolerance is expected in the design. Systems or functions with ZERO hardware fault tolerance (HFT = 0) cannot tolerate a single dangerous failure.
What determines SIL level?
The SIL level number is based on the amount of risk reduction needed to maintain an acceptable rate of failure. Each of the 4 levels of SIL represents an order of magnitude of risk reduction – the higher the level, the greater the impact a failure (and thereby, the lower the acceptable failure rate).
What is a safety instrumented function?
An individual Safety Instrumented Function (SIF) is designed to first identify the need and then act to bring the system to a safe state for each hazard scenario. It is a specific singleset of actions and the corresponding equipment needed to identify a singlehazard and act to bring the system to a safe state.