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SIL

SIL(Safety Integrity Level)

SIL is the abbreviation of Safety Integrity Level, which is the technology that predicts from the first concept design of the system to the disposal and grafts the design and production and also the system engineering technology that collects, analyses the test and operation data and builds a database and carries out the estimation and analysis activity by RAMS element and finally secure the best product quality and safety by deriving a plan for design support/evaluation and design improvement and measures.

SIL applies IEC 61508 as basic standard to each industry differently. The technical and procedure requirement related to the analysis, design, implementation, test and maintenance activity necessary for securing the safety is applied differently by safety integrity level by applying IEC 61513 for Nuclear, and DO-178 & DO-254 for Aerospace, EN50126 (IEC 62278), EN50128 (IEC 62279) and EN50129(IEC 62425) for Railway, and ISO 26262 for Automotive, and ISO 17894 for Marine industry

SIL standard by industrial area

SIL Expectation Effect

SIL needs the selective management for the safety and the substantial investment but improves the competitiveness through reliability/safety management.

Extension of safety problem solving area

The development of science and technology provides the wide range of technical solution, with the accelerated product innovation cycle
According to the expansion of digital convergence, lots of responsibility for functional safety is allocated to the digitalized equipment.
It brings the result that the area of problem solving related to the safety is getting wide.

The Past

The verified technology was used to accomplish the safety
Mechanical/Electro-Mechanical safety system in the majority
Single mode system in the majority
“Hard-Wired”safety
Centralized safety structure

The Present

In case of application of new technology, a high probability to decrease the safety
Electronic/SW based safety system is spread rapidly
Extension of multimode and single system
Network/IT convergence/intelligence based safety
The distributed safety structure
High level design tool

System Development Lifecycle

S/W Development Lifecycle

Application of safety engineering

System /SW safety engineering

Risk analysis
Application of recommended development technique
Safety proved

The era of ICT & Convergence

Increase of complexity for development/management
Increase of development cost
Issue to prove the safety

System Development

Risk analysis based system development - System Engineering
SW system development - State of Art
SDLC - Railway/Automotive/Nuclear etc.

SIL proof demand

Client (Domestic/Overseas) - Required to obtain a SIL certificate
Increase of industry for SIL certificate - Now spreading to all kinds of industry that needs the safety such as railway, automotive, chemical plant, power plant, general product etc.

Safety Integrity Level, SIL

Safety Integrity Level means the low risk level provided by Safety Function and the measurement for the performance required for a safety instrumented function (SIF)
The safety integrity rating is defined in a little different shape according to the standard for each safety function (SIL1 ~ SIL 4, SIL A ~ SIL D, PLa ~ Ple, CAT1 ~ CAT4 etc.) and each rating defines the allowable level of dangerous failure of the corresponding function.
The higher the figure of SIL grade is, the higher the safety integrity level is. (The level of safety management should be also high.)