What is IEC 61508 standard?
IEC 61508 is the international standard for electrical, electronic and programmable electronic safety related systems. It sets out the requirements for ensuring that systems are designed, implemented, operated and maintained to provide the required safety integrity level (SIL).
How many parts are there in IEC 61508?
The 8 Parts of IEC 61508 Part 2: Requirements for E/E/PE safety-related systems. Part 3: Software requirements. Part 4: Definitions and abbreviations. Part 5: Examples of methods for the determination of safety integrity levels.
What is meant by functional safety?
Functional safety is part of the overall safety of a system or piece of equipment that depends on automatic protection. This automatic protection system needs to respond correctly to its inputs. And it should have predictable responses to failure.
What is a SIL 1?
Safety integrity level (SIL) is defined as a relative levels of risk-reduction provided by a safety function, or to specify a target level of risk reduction. In the functional safety standards based on the IEC 61508 standard, four SILs are defined, with SIL 4 the most dependable and SIL 1 the least.
What is SIL2 and SIL3?
A SIL3 device has a lesser chance of failure on demand, than a SIL2 device.SIL levels are more applicable to safety systems and normally are stated for systems rather than single devices.Main difference between SIL 2 and SIL 3 is Probability of failure on demand per year.It does not differ in operational functionality …
What is SIL3?
SIL3 or Safety Integrity Level (SIL) is based on the value of risk reduction associated with a Safety Instrumented Function (SIF) protecting against a specific hazardous event, or how the risk has to be reduced to reach an acceptable level.
Why is functional safety required?
The systems covered under functional safety are designed to automatically prevent dangerous failures or to control them when they occur. It helps us to design a system that can execute specific functions correctly, even under non-intended use (or sometimes even misuse).
What is functional safety testing?
About Functional Safety Testing ‘Functional safety’ is the aspect of the overall safety of a system or piece of equipment that relates to the machines or products operating correctly in response to their inputs, including the safe management of possible operator errors, hardware failures and environmental changes.
What is a SIL 2 rating?
SIL2 – Low statistical risk of failure that you do not know about in the product. SIL3 – Redundant measurement capability – one of the primary differentiators between SIL2 and SIL3. SIL4 – Very few instruments available on the market, and extremely harsh demands to be certified for this.
What is iaiec 61508?
IEC 61508 is an international functional safety standard and it provides a framework for safety lifecycle activities. Titled “Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems (E/E/PE, or E/E/PES)”, 61508 is the umbrella functional safety standard — and the source for industry-specific standards.
What is IEC 61508 and why is it important?
IEC 61508 helps to ensure the functional safety of software for many industries. That is why one beneficial strategy is to use functional safety standards. Here, we explain what is IEC 61508 and provide safety integrity level (SIL) basics — including what is SIL and how to determine the SIL level.
What is the IEC code for safety integrity?
ISO 26262 for automotive electric/electronic systems. EN 50128 for railway applications. IEC 62304 for medical devices. IEC 62061 for machinery system design. What Are Safety Integrity Level (SIL) Basics?
What is an ISO 61508 certification body?
IEC 61508 certification programs are operated by impartial third party organizations called certification bodies (CB). These CBs are accredited to operate following other international standards including ISO/IEC 17065 and ISO/IEC 17025.