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Functional Safety Engineering

Full SIL lifecycle — determination, SIS design, IEC 61511/61508 compliance, audits, and proof test procedures.

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Strategic context

Why functional safety engineering matters

Functional Safety Engineering is the IEC 61511 / 61508 lifecycle discipline that proves a Safety Instrumented System actually achieves the SIL allocated to it. The work spans Phase 1 hazard analysis through Phase 16 decommissioning — SRS development, FMEDA-grade component selection, PFD / PFH verification, architectural constraint checks, FAT / SAT, proof-test programme design, Safety Manual authoring, and the cybersecurity overlay per IEC 62443 that the 2016 edition of IEC 61511 made non-negotiable. Outputs withstand TÜV, exida, FSA Stage 2/3, and post-incident regulator examination.

Functional Safety Engineering
Capabilities

Functional Safety Engineering capabilities

Functional safety lifecycle implementationView detail page →
SIL determination & verification calculationsView detail page →
Safety requirement specification (SRS) developmentView detail page →
Safety instrumented system (SIS) designView detail page →
Alarm management and rationalizationView detail page →
Safety PLC engineering & proof test proceduresView detail page →
Functional safety auditsView detail page →
IEC 61511 & IEC 61508 compliance supportView detail page →
Engagement model

How we deliver

A phased, evidence-led delivery model — from discovery through close-out — built around your facility, regulatory context, and lifecycle stage.

SIL Allocation Hand-off
Receive SIL Allocation Register from the hazard-study team; verify SIF boundaries, demand-mode classification, and conditional-modifier assumptions per IEC 61511 Cl.9.
SRS & Design Basis (Phase 5)
Author Safety Requirements Specification per IEC 61511 Cl.10; specify architectural targets, redundancy, cybersecurity zone definition; align with IEC 62443.
Architecture & Verification
FMEDA-grade component selection, PFD / PFH calculation per IEC 61508-6, architectural-constraint check (Route 1H / 2H), β-factor scoring, voting design.
FAT / SAT & Commissioning
Exercise every SIF cause-and-effect, end-to-end loop testing, Safety Manual authoring per Cl.16, FSA Stage 2 / 3 examination preparation.
Operations, FSA & Proof-Test
Phase 14 proof-test programme, FSA Stage 4 (every 3–5 yrs), partial-stroke-test specification, MOC for SIS modifications, cybersecurity lifecycle.
Outcomes & value

What this service delivers

  • Right-sized SIS architecture preventing the SIL-3-everywhere capex trap
  • FMEDA-grade verification surviving FSA Stage 2/3 examination
  • Spurious-trip frequency engineered into MTTFS targets
  • Cybersecurity zone-and-conduit closing the IEC 62443 gap
  • Living Safety Manual surviving operating-team handover
Why Arborion

Our differentiators

  • TÜV / exida-certified Functional Safety Engineers (CFSE / CFSP)
  • Vendor-agnostic SIS design — Triconex, HIMA, ABB, AB, Siemens
  • Integrated SIL → SRS → Design → Verification → FAT/SAT workflow
  • Cyber-aware SIS engineering per IEC 62443 (not bolted on later)
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Talk to us about functional safety engineering.

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