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Safety Instrumented Systems


The course presents an overview of the concepts regarding the functional safety. It is addressed to everyone concerned in any phase of SISs safety life cycle and it gives the basis for the management of functional safety, with particular reference to the design of Safety Instrumented Systems and devices used in them.

The duration of the course is four days and a half: during the first three days, we present the topics, through the support of examples and practical cases, in order to understand and deepen the requirements of standards IEC 61511 and IEC 61508. The fourth day there will be a tutorial, where participants have the possibility to apply the basics illustrated in the previous three days. On the last day, participants will take the examination.


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Day 1

Introduction to functional safety

  • What is the functional safety
  • What is a Safety Instrumented System
  • Legislative requirements
  • Main requirements of standards IEC 61511/61508

Functional Safety relevant parameters

  • Systematic Capability and Systematic Integrity
  • Failure Rates, Common Cause Failures
  • Diagnostic Coverage
  • Architectural Constraints

Functional Safety Management

  • Functional Safety Management System and Safety Lifecycle
  • Safety Plan
  • Documentation
  • Responsibilities and competence
  • Independence level
  • Functional safety assessment

Day 2

Risk analysis and SIL Allocation

  • ALARP and tolerable risk
  • Hazard and Risk Analysis
  • Protection levels
  • Safety functions allocation
  • Methods for SIL Allocation
    • Risk Graph
    • Layer of Protection Analysis (LOPA)

Design of Safety Instrumented Systems and devices used in them

  • Safety Requirements Specification
  • Realisation of safety systems
    • General rules for SIS design
    • System architectures
    • Diagnostic methods
    • Behaviour on detection of a fault
    • Techniques and measures to control/avoid HW systematic failures
    • Selection of devices to be used in a SIS

Day 3

Estimation of random failures and PFDAVG / PFH

  • Random failures estimation:
    • FMEA
    • Field feedback
  • PFDAVG / PFH estimation for different architectures:
    • Reliability Block Diagrams
    • Markov models

Realisation of software for safety applications

  • Requirements for embedded and application SW
  • Software life cycle:
    • SW safety requirements specification
    • SW development
    • SW validation
  • Techniques and measures to control/avoid SW systematic failures

Use of Safety Instrumented Systems

  • Installation and commissioning
  • Validation
  • Operation, maintenance and repair
  • Management of modifications
  • Safety Manual

Various exercises and examples (>40) are given during the three-day courses on the different topics.

Day 4

Tutorial on the design of a Safety Instrumented System.


In accordance with the TÜV Functional Safety Training Program.

  • A minimum of 3 to 5 years experience in the field of functional safety.
  • University degree or equivalent engineering experience and responsibilities as certified by employer or engineering institution.


The last day consists of a four hour examination.

Pass score is 75%


This training is held in Italian language.


Total price per participant is 2.500,00 € + VAT
10% discount for more than one participant of a single company.
The price includes course material, registration fees and FS Engineer (TÜV Rheinland) certificate, if exam has been passed successfully and requrements are fulfilled.