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About the SIL module 

Benefits of the SIL module, SIL calculation and verification software of GRIF


and ergonomic


Efficient, accurate
calculations (ALBIZIA)


Complies with 
IEC 61508 and IEC 61511

You can define the SIS architecture to be evaluated by interactively selecting the components of the Safety Instrumented Function (sensors, solver, actuators, KooN voting logic). You then characterize each component of the safety loop by specifying the following:

  • Reliability parameters (failure rate, diagnostic coverage, common modes, etc.);
  • Maintenance parameters (test frequency and duration, time to repair, etc.);
  • • The SIL module uses SIS architecture transcribed into fault trees to run the SIL computations to obtain the Average PFD (Probability of Failure on Demand) and the PFH (Probability of Failure per Hour).


  • The SIL module, a Safety Integrity Level calculation software, can be used to evaluate the temporal indicators for each component (sensors, solver and actuators) of the Safety Instrumented Function (SIF). The created SIFs can be reused as safety barriers with event trees.
  • Computations are run using the computation engine ALBIZIA and serve to assess the PFD or PFH. The computation technique produces accurate results, which are the instantaneous values, average values and maximum values over the period and the percentage of time spent in each SIL.

  • PFD and PFH calculations with an accurate algorithm (not a simple approximation of the average).PFD and PFH computations with accurate algorithms (not a simple approximation of the average).
  • HFT and architectural constraints according to standards IEC61508 and IEC61511.
  • User-friendly graphic user interface.
  • Advanced configuration for components (Proof test coverage, Partial stroking, Human error, etc.).
  • Spurious Trip computation.
  • Multi-loop systems, components can be shared. 
  • Management of 16 sensor channels containing up to 24 sensors each.
  • Management of 24 actuator channels containing up to 8 actuators each.
  • Implementation of IEC standard 61508-6, part D on the Beta factor definition (Separation/Segregation, Diversity/Redundancy, etc.).
  • PDF report with SIF summary and maintenance schedule (testing period for each component).
  • The SIFs created can be reused as safety barriers with an Event Tree or in the Risk module.

  • Database for components: creation and management of generic component models (sensors, actuators, solvers).
  • Input data summarized in tables making it easier to check the quality of an entry.
  • Results are stored in the document and can be exported in a variety of formats (csv, XML, Excel, etc.).
  • Results can be viewed as line graphs, pie charts or histograms.
  • Printing in PDF vector format produces high-quality images and the files are small enough to be sent by email, even if the document contains hundreds of pages.
  • External files (PDF certificates, system images, etc.) can be added to the document and incorporated into the full report.
  • Interaction with the operating system: option to copy/paste line graphs, systems or results to word processing software, spreadsheets, or presentation tools.


Sectors of activity: aeronautics, aerospace, energies, defense, telecoms, transportation, health, universities and research

GRIF is designed for any field of activity

Whether for an oil platform, aircraft, train or water supply system, GRIF evaluates the reliability and availability of any system using a range of computational techniques. The GRIF software suite offers a wide variety of calculation methods so that users can select the most appropriate (analytical, simulation, etc.), according to the system being modeled.

Need more information? 

The SIL module is part of the GRIF Boolean package 

About GRIF software suite