Functional Safety Consulting Services | IEC 61511 & SIL

Arista Cyber provides functional safety consulting services that help industrial operators keep their safety-critical systems reliable, compliant, and audit-ready across the entire safety lifecycle. From hazard identification through SIL determination, verification, and validation, our industrial functional safety specialists work to the requirements of IEC 61511, IEC 61508, and ISO 26262, so your safety instrumented systems deliver the risk reduction they were designed for. Uniquely, we integrate functional safety with OT cybersecurity, because in modern plants a cyberattack on a safety system is itself a functional safety risk.

Functional Safety Services for Industrial Operations

Engineering-led functional safety consulting aligned to IEC 61511 and ISO 26262.

Arista Cyber delivers functional safety services that keep safety-critical industrial systems reliable, compliant, and protected across the entire safety lifecycle. From hazard identification to safety validation, our certified functional safety experts help operators reduce risk, meet functional safety standards, and prove their systems perform when it matters most.

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What Is Functional Safety?

Functional safety is the part of overall system safety that depends on protective systems operating correctly in response to their inputs. In industrial environments, it is what ensures a Safety Instrumented System, interlock, or emergency shutdown responds the way it should when a hazardous condition occurs, protecting people, equipment, and production.

Achieving it is not a one-time task. Industrial functional safety spans the full lifecycle of a safety system, from initial hazard analysis and functional safety requirements through design, functional safety implementation, validation, and ongoing management. Arista Cyber provides functional safety engineering across every one of those stages, aligned to recognized functional safety standards including IEC 61511 for the process industries and ISO 26262 for automotive systems.

Our Functional Safety Services

HAZOP / HAZID Studies

Systematic hazard and operability studies that identify risks and design safeguards to mitigate them, forming the foundation of your functional safety assessment.

SIL Assessment and Determination

Safety Integrity Level assessment that evaluates the exact level of risk reduction each safety function requires under IEC 61511.

Safety Requirement Specification (SRS)

Detailed functional safety requirements documentation that defines clear, testable safety goals for every safety-critical system.

Safety Validation and Verification

Validation and verification that confirms safety systems meet both regulatory functional safety standards and real operational requirements.

Functional Safety Management (FSM)

Functional Safety Management documentation that tracks and governs the complete safety lifecycle of your systems.

Functional Safety Digitization

Digital transformation of safety processes using functional safety software and workflows for traceability, efficiency, and ongoing compliance.

RAMS Study

Reliability, Availability, Maintainability, and Safety analysis that optimizes system performance across all four dimensions.

Functional Safety Assessments (FSA 1-5)

A structured series of functional safety assessments and audits across the lifecycle to evaluate safety performance and close gaps.

Proof Test Procedures

Proof test procedures that validate safety system functionality under real-world operating conditions.

Functional Safety and Cybersecurity, Integrated

A cyberattack on a Safety Instrumented System is itself a functional safety failure. Most providers treat functional safety engineering and OT cybersecurity as separate disciplines, and the gap between them becomes the exposure. Arista Cyber is a functional safety consultancy that integrates both, aligning IEC 61511 with ISA/IEC 62443 so your safety systems are protected against random failure and deliberate attack alike.

This integrated approach is what sets our functional safety consulting apart in industrial manufacturing and critical infrastructure.

The IEC 61511 Safety Lifecycle: How Our Services Fit Together

Functional safety is not a single task; it is a lifecycle. Each of our services maps to a specific stage of the IEC 61511 safety lifecycle, so your safety systems are covered from initial hazard analysis through operation and modification.

Lifecycle Stage	What Happens	Arista Cyber Service
1. Hazard & Risk Assessment	Identify hazards and assess process risk	HAZOP / HAZID Studies
2. SIL Determination	Assign target Safety Integrity Levels to each safety function	SIL Assessment & Determination
3. Safety Requirements	Define what each safety function must do	Safety Requirement Specification (SRS)
4. Design & Verification	Confirm the SIS design meets the target SIL	SIL Verification, Proof Test Procedures
5. Validation	Prove the installed system performs as specified	Safety Validation & Verification
6. Operation & Maintenance	Keep safety functions performing over time	RAMS Study, FSM Documentation
7. Assessment & Modification	Audit performance and manage change	Functional Safety Assessments (FSA 1 to 5)

Where Functional Safety Meets Cybersecurity

A safety instrumented system that can be reached by an attacker is no longer a reliable safety system. This is why Arista Cyber is one of the few functional safety providers that also delivers OT cybersecurity. We align IEC 61511 functional safety with ISA/IEC 62443 cybersecurity, so your safety systems are protected against both random failures and deliberate attacks. For operators in oil and gas, energy, and process industries, this integrated approach closes a gap that safety-only and security-only providers leave open.

Functional Safety Standards We Work To

Our functional safety assessments and supporting documentation align to the standards that regulators and auditors expect:

IEC 61511 — functional safety for the process industry sector and Safety Instrumented Systems.
ISO 26262 — functional safety for automotive electrical and electronic systems.
IEC 61508 — the foundational functional safety standard for electrical, electronic, and programmable safety systems.
ISA/IEC 62443 — applied where functional safety and OT cybersecurity intersect.

Industries We Protect

we provide specialized functional safety services in industrial manufacturing and across every sector where safety-critical processes carry real operational consequence: oil and gas, energy and utilities, manufacturing, pharmaceuticals, automotive, and mining. Each sector carries its own risk profile, and our functional safety engineering consultants tailor every engagement to the operating constraints, asset criticality, and regulatory expectations of the environment.

OIL & GAS

Securing exploration, production, and distribution systems.
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MANUFACTURING

Protecting automated production lines and machinery safety systems
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ENERGY

Safeguarding generation, transmission, and control centers.
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UTILITIES

Enabling resilient and secure operations for utility providers.
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PHARMACEUTICALS

Ensuring compliance, protecting formulas and IP.
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MINING

Safety systems for extraction, processing, and haulage operations
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Why Choose Our Functional Safety Services?

Certified Expertise:

Our team holds globally recognized functional safety certifications and applies a structured, standards-based methodology to every engagement.
- TUV Rheinland / TUV SUD Functional Safety Engineer (FSEng) certification
- CFSE or CFSP (Certified Functional Safety Expert / Professional)

Full-Lifecycle Coverage:

We support every stage of the safety lifecycle—from hazard analysis and risk assessment to functional safety implementation and ongoing management.

Integrated Safety & Security:

We combine functional safety and industrial cybersecurity in practice, uniting IEC 61511 and IEC 62443 for comprehensive protection of modern safety systems.

Audit-Ready, Tailored Outputs:

Our assessments, requirements, and documentation are customized for your operations and designed to withstand regulatory and audit scrutiny.

Talk to a Functional Safety Expert

Whether you need a single functional safety assessment or a complete functional safety implementation program, our team is ready to help you reduce risk and meet every functional safety standard that applies to your operation.

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Frequently Asked Questions (FAQ)

A functional safety consultant helps organizations identify hazards, define functional safety requirements, determine the required Safety Integrity Level, and validate that protective systems perform correctly. Arista Cyber's certified functional safety experts provide functional safety consulting services across the full lifecycle, and integrate cybersecurity where safety systems are exposed to cyber risk.

Our functional safety consulting and documentation align to IEC 61511 for process industry safety systems, ISO 26262 for automotive, IEC 61508 as the foundational standard, and ISA/IEC 62443 where safety and cybersecurity intersect, ensuring your safety lifecycle documentation holds up to regulatory and audit scrutiny.

Yes. Arista Cyber provides functional safety in industrial manufacturing alongside oil and gas, energy and utilities, pharmaceuticals, automotive, and mining. Our functional safety engineering consultants tailor each engagement to the specific process risk and regulatory profile of your sector.

A functional safety assessment (FSA) is a structured audit of a safety system across its lifecycle—design, implementation, operation, and modification—to confirm it delivers the required level of risk reduction. Arista Cyber conducts FSA 1 through FSA 5 assessments, each corresponding to a specific stage of the safety lifecycle, so gaps are caught before they become incidents.

Timelines depend on scope and the FSA stage involved (1 through 5)—a single-system SIL assessment can take a few weeks, while a full lifecycle FSA across multiple safety systems takes longer. Arista Cyber scopes this with you upfront based on your facility's complexity.

In OT environments, a safety system failure isn't just a compliance issue—it can mean unplanned shutdowns, equipment damage, or harm to personnel. Functional safety ensures that protective systems like Safety Instrumented Systems (SIS) respond correctly when something goes wrong, keeping both people and production protected.

Yes. Arista Cyber supports Functional Safety Services in Canada across oil & gas, manufacturing, energy & utilities, and mining—sectors where Canadian regulatory expectations and IT/OT convergence are creating new pressure on safety and compliance programs. Our team works directly with Canadian operators to bridge functional safety and cybersecurity without disrupting plant operations.

Functional safety focuses on preventing systems from failing in ways that cause harm (think SIS, interlocks, and emergency shutdown systems). Cybersecurity focuses on preventing unauthorized access or attacks. Arista Cyber integrates both, since a cyberattack on a safety system is itself a functional safety risk—this is the core of how we approach ISA/IEC 62443 compliance.

Any industry running safety-critical processes—oil & gas, manufacturing, energy & utilities, pharmaceuticals, automotive, and mining are the sectors Arista Cyber currently supports. Each has its own risk profile, from process safety in refineries to functional safety in automated production lines.

Functional Safety Services cover the full lifecycle of keeping safety-critical industrial systems reliable and compliant, from identifying hazards to validating that safety systems perform as designed. This includes HAZOP/HAZID studies, SIL assessment and determination, Safety Requirement Specifications (SRS), safety validation and verification, RAMS studies, and Functional Safety Management documentation, all aligned to standards like IEC 61511 and ISO 26262.

We provide detailed supporting documentation including Safety Requirement Specifications (SRS), safety validation reports, audit findings, RAMS studies, and Functional Safety Management plans and records, all mapped to the relevant IEC/ISO standards to streamline compliance and inspections.

Our experts bridge the gap between functional safety and cybersecurity by identifying cyber threats to safety-instrumented systems, integrating risk analysis across safety and security, and ensuring alignment with both IEC 61511/61508 and ISA/IEC 62443 standards for a unified safety approach.

Functional Safety Services