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IEC 61511 Functional Safety: SIS, SIL & Safety Engineering

Name: IEC 61511 Functional Safety: SIS, SIL & Safety Engineering
Rating: 4.3 (207 reviews)

Master IEC 61511/61508, SIS design, LOPA, SIL calculations & proof testing - 28 quizzes, 11.5hrs comprehensive training

Role Play

Created byProjectEngPro Engineering and Project Management

Last updated 6/2026

English

English [Auto],

What you'll learn

Design Safety Instrumented Systems per IEC 61511 including LOPA analysis, SIL determination, component selection, and redundancy configurations
Implement SIS architecture with sensors, logic solvers, and final control elements using voting logic (1oo1, 1oo2, 2oo2, 2oo3) and redundancy
Calculate probability of failure on demand (PFD), common cause failures, and develop proof testing procedures per IEC 61511 requirements
Create Safety Requirements Specifications (SRS) and conduct Functional Safety Assessments (FSA) for industrial safety systems

Course content

12 sections • 54 lectures • 11h 32m total length

Industrial Disasters – Accidents | History | Solutions | Safety Control Syste10:42
What is Safety? Why do we need Safety?10:03
What is Basic Process Control System?8:20
Explore the basic process control system (bpcs), its sensors, controllers, control valves, hmi, and cascade control to maintain safe, efficient industrial operations with automated monitoring.
What is Basic Process Control System?
Introduction to Safety Instrumented System – SIS Functional Safety7:39
Introduction to Safety Instrumented System – SIS Functional Safety
Difference between SIS and BPCS8:55
Compare the dynamic, active basic process control system with the dormant safety instrumented system. See how SIS activates in emergencies, employs redundancy and extensive diagnostics, and follows IEC safety standards.
Difference between SIS and BPCS
Do We Need a Safety Instrumented System?

Module Introduction4:41
This section - is a section from our Cyber Security for Industrial Control Systems course. I have added this section to give more of a background on control systems.
Distributed Control Systems (DCS)16:39
Explore how distributed control systems coordinate field sensors, io cards, controllers, and hmi software with engineering and operator workstations to run industrial processes and store data with historians and opc.
Programmable Logic Controllers (PLC)8:42
Explore programmable logic controllers in industrial automation, including IO cards, HMIs, historians, and versatile networks like ControlNet, DeviceNet, and Ethernet to control and monitor complex processes.
SCADA Overview15:22
Explore how SCADA systems monitor and control industrial processes from a central view, using PLC/RTU, HMI, and diverse communication methods, with a zonal architecture and DMZ security.
Building Automation and Control Systems12:22
Safety Instrumented Systems (SIS)18:49
Industrial Internet of Things (IIoT)10:39
Explore how the industrial internet of things connects sensors and devices through networked connectivity and internet integration to optimize industrial operations with data, analytics, and edge computing.
Module Conclusion2:20
Explore distributed control systems, PLCs, SCADA, building automation, safety instrumented systems, and industrial internet of things, then preview cybersecurity concepts, Purdue model, and defense in depth in industrial networks.

SIS Terminology – Safety Instrumented Systems15:31
Define safety instrumented systems terminologies and show how terms like SIL, FD, CCF, Hazop, LOPA, sensors, logic solvers, and final control elements connect to SRS, validation, and proof testing.
SIS Terminology – Safety Instrumented Systems
What is Functional Safety? – IEC 61511 and IEC 61508 Standards15:16
What is Functional Safety? – IEC 61511 and IEC 61508 Standards
Layers of Protection Analysis – LOPA Definition12:02
Explore layer of protection analysis (LOPA) and its use of independent protection layers (IPLs) to reduce risk to ALARP levels in industrial processes, including SIS integration.
What is Functional Safety? – IEC 61511 and IEC 61508 Standards
What is Safety Instrumented Function? – SIF Definition and Examples12:37
Difference between SIS and BPCS
Do We Need a Safety Instrumented Function?

SIS Loop – Components of Safety Instrumented System8:25
Explore how safety instrumented system loops safeguard processes through sensors, logic solvers, and final control elements, enhanced by CIS loop concepts, electrical relays, and redundancy configurations.
SIS Loop – Components of Safety Instrumented System
SIS Sensors – Initiators – Sensor Diagnostics7:56
Explore how safety instrumented systems rely on sensors to monitor parameters, detect hazards, and initiate protective actions, while emphasizing reliable diagnostics and robust design.
SIS Sensors – Initiators – Sensor Diagnostics
What is a Logic Solver?7:38
What is a Logic Solver?
Final Control Elements – SIS Valves9:54
Final Control Elements – SIS Valves
Redundancy in Safety Instrumented Systems – SIS Sensors8:07
Learn how redundancy in safety instrumented systems strengthens reliability by duplicating sensors, logic solvers, and final elements, using voting logic to maintain operation during failures.
Redundancy in Safety Instrumented Systems – SIS Sensors
Voting Logic in SIS – 1oo1 1oo2 2oo2 2oo1 2oo3 Voting System12:30
Explore voting logic in safety instrumented systems, comparing simplex, duplex, and triplex configurations and how one out of one to two out of three balance safety, redundancy, and availability.
Voting Logic in SIS – 1oo1 1oo2 2oo2 2oo1 2oo3 Voting System
Safety Architecture9:18
Explore safety architecture and safety instrumented systems, detailing sensors, logic solvers, final control elements, redundancy, diagnostics, and lifecycle considerations under IEC 61 508 and IEC 61 511 standards.
Safety Architecture
Choosing the Right Voting Logic

Safety Instrumented System Design – Objectives, Components, Loops11:37
Safety Instrumented System Design – Objectives, Components, Loops
De-Energize to Safe Loop – SIS Instrumentation7:10
De-Energize to Safe Loop – SIS Instrumentation
Energize to Safe State – Emergency Shutdown System5:52
Explore energize to save state in safety instrumented systems, applying emergency shutdown and deluge valve operations in fire protection contexts to ensure rapid, reliable safety actions during hazardous events.
Energize to Safe State – Emergency Shutdown System
What is Proof Testing? Why Proof Test is Important in Oil & Gas Plants?10:26
Perform regular proof testing to uncover hidden faults and verify the safety instrumented systems, including sensors, logic solvers, and final control elements.
What is Proof Testing? Why Proof Test is Important in Oil & Gas Plants?
Basics of Probability of Failure on Demand (PFD)10:14
Explore the probability of failure on demand (PFD) and safety integrity levels (SIL) in safety instrumented systems, detailing components, the FD budget, proof testing, and low demand mode.
Basics of Probability of Failure on Demand (PFD)
Choosing Energize-to-Trip or De-Energize-to-Trip

Maintenance Process – Safety Instrumented System (SIS)12:29
Explore the maintenance process of safety instrumented systems, focusing on proof testing and documentation. Define proof test frequency per SIL, monitor status indicators, and ensure timely repairs to maintain reliability.
Maintenance Process – Safety Instrumented System (SIS)
SIS Documentation11:32
Explore safety instrumented systems documentation, including layer of protection analysis (LOPA), SIF and CIF records, proof testing, maintenance, and management of change to ensure risk reduction and compliance.
SIS Documentation
SIS Reliability – Why Reliability is Important?14:18
SIS Reliability – Why Reliability is Important?
SIS Failures – Bathtub Curve – Methods to Overcome9:34
SIS Failures – Bathtub Curve – Methods to Overcome
Safety Instruments Maintenance – SIS Testing and Repair Deferral10:10
Assess proof testing, deferral processes, and maintenance for safety instrumented systems (SIS) to maintain compliance with CIS testing and repair protocols, including intervals, approval workflows, and maximum deferral limits.
Safety Instruments Maintenance – SIS Testing and Repair Deferral

Common Cause Failure (CCF) – Instrumentation and Control Systems10:44
Common Cause Failure (CCF) – Instrumentation and Control Systems
SIS Application Program Basics11:09
SIS Application Program Basics
Safety Instrumented System Parameters and Definition – SIL Level10:14
Explore safety instrumented system parameters, including initiating events, independent protection layers, and sil levels, and see how proof testing, change monitoring, and risk assessment reduce hazards.
Safety Instrumented System Parameters and Definition – SIL Level
Instruments and Transmitters – SIS Instrumentation Common Cause Failure Details6:31
Explore common cause failures in safety instrumented systems, analyze how shared dependencies undermine redundancy, and reduce CCF with independent connections, diversity, and regular proof testing.
Instruments and Transmitters – SIS Instrumentation Common Cause Failure Details
Does This SIF Meet Its SIL Requirement?

Safety Requirement Specification (SRS)24:29
SRS Example14:16
Walk through a complete SRS worksheet for a compressor safety function, translating hazard analysis and layer of protection analysis into clear safety requirements and implementable specifications.
Safety Requirements Specifications – Principles and Content17:24
define and translate hazard analysis results into a complete SRS, establishing functional requirements, SIL targets, proof test intervals, and traceability within the IEC 61511 framework.
What is an SRS? – SIS Systems21:59
SRS Roles & Responsibilities17:46
Explore how a multidisciplinary team drives safety requirements specification through the IEC 61 511 life cycle, clarifying roles for process, control, safety, and operations stakeholders.

SIS Valves Proof Testing11:23
Proof testing verifies the complete safety instrumented system valve performance under actual process conditions, detects hidden failures, and supports SIL verification through full-stroke testing and documentation.
SIS Instruments Inline Proof Testing16:34
Inline proof testing verifies safety instrumented system performance without disrupting plant operations. Sequential inline testing reduces failure on demand near the SIL threshold and enables predictive maintenance through diagnostics.
Inline Proof Testing Details – Instruments and Valves17:10
Proof Testing Safety Instrumented Systems16:50
Proof Test Deferral Decision

SIS Maintenance and Engineering Best Practices14:47
Translate regulatory requirements into practical SIS maintenance and engineering strategies that optimize safety, integrity, and reliability. Embrace predictive analytics, risk-based maintenance, diagnostic coverage, and competency development for lifecycle cost optimization.
Safety Instruments Maintenance Concepts16:50
Explore safety instrument maintenance concepts for cis, covering failure modes, calibration management, predictive maintenance, inline diagnostics, and risk-based strategies to preserve safety integrity across smart instruments.
SIS Testing and Repair Deferral Best Practices22:05

Requirements

Basic engineering principles helpful but not required—course covers IEC 61511 fundamentals systematically for beginners
Interest in process safety, industrial automation, instrumentation & control, or functional safety engineering
No software required—all SIS concepts explained with diagrams, examples, and 28 practice quizzes
Suitable for beginners through experienced engineers seeking IEC 61511 compliance knowledge and TÜV certification preparation

Description

262 students. 4.43/5.0 rating. 100% say "clear explanations." 100% say "knowledgeable instructor." 93% say "valuable information." 93% say "engaging delivery." This comprehensive IEC 61511 functional safety course includes 28 quizzes for hands-on practice.

Master Safety Instrumented Systems (SIS) design, implementation, and maintenance per IEC 61511 and IEC 61508 international standards. Learn functional safety methodology including LOPA (Layers of Protection Analysis), SIL (Safety Integrity Level) calculations, redundancy configurations, voting logic, and proof testing procedures used in oil & gas, chemical, pharmaceutical, and process industries.

WHAT YOU'LL LEARN

Safety Instrumented Systems Fundamentals - Understand SIS role in preventing industrial disasters including Bhopal, Piper Alpha, Texas City, and Deepwater Horizon. Learn the difference between BPCS (Basic Process Control Systems) and SIS, and why dedicated safety systems are critical.

IEC 61511 & IEC 61508 Standards - Master international functional safety standards including safety lifecycle, SIL requirements, systematic capability, random hardware failures, and documentation requirements. Prepare for certifications like TÜV Rheinland Functional Safety Engineer.

LOPA Methodology - Apply Layers of Protection Analysis to determine required SIL levels. Calculate independent protection layers (IPLs), initiating event frequencies, and risk reduction requirements.

SIS Components & Architecture - Design SIS loops using sensors (initiators), logic solvers (safety PLCs), and final control elements (shutdown valves). Understand sensor diagnostics, partial stroke testing, and de-energize-to-safe vs energize-to-safe configurations.

Redundancy & Voting Logic - Implement redundant architectures (1oo1, 1oo2, 2oo2, 2oo3) to achieve required SIL levels. Calculate probability of failure on demand (PFD), common cause failures (CCF beta factor), and diagnostic coverage.

SIS Design & Implementation - Design complete safety instrumented functions (SIF) from hazard identification through implementation. Learn de-energize to safe and energize to safe design philosophies for emergency shutdown systems.

Proof Testing & Maintenance - Develop proof test procedures, calculate test intervals, understand repair deferral policies, and implement SIS maintenance programs. Learn inline testing techniques to avoid process shutdowns.

Safety Requirements Specification (SRS) - Create comprehensive SRS documents defining SIF requirements, SIL targets, response times, test intervals, and operational constraints per IEC 61511 requirements.

Functional Safety Assessment (FSA) - Understand FSA stages 1-5, timing requirements, independent assessment criteria, documentation evidence, and lessons learned from safety lifecycle phases.

COURSE STRUCTURE

54 lectures (11 hours 32 minutes) across 11 comprehensive sections
28 quizzes reinforcing key concepts after each major topic
Real industrial disaster case studies and lessons learned
Practical SIS design examples and calculations
IEC 61511 and IEC 61508 standard applications
TÜV Rheinland functional safety certification preparation guidance

28 PRACTICE QUIZZES INCLUDED

Unlike most functional safety courses, this training includes 28 quizzes covering:

- Safety terminology and definitions

- IEC 61511/61508 requirements

- LOPA calculations

- SIS component selection

- Voting logic configurations

- Redundancy architecture

- Proof testing procedures

- SRS documentation

WHO THIS IS FOR

Safety engineers implementing IEC 61511 compliance programs
Instrumentation & control engineers designing SIS for process plants
Process safety managers overseeing functional safety lifecycle
Automation specialists programming safety PLCs and logic solvers
Project engineers managing safety system design and installation
Technicians installing, commissioning, and maintaining SIS equipment
Compliance officers ensuring adherence to IEC 61511/61508 standards
Engineers preparing for TÜV Rheinland or Exida CFSE/CFSP certifications
Anyone involved in process safety, risk assessment, or HAZOP studies

CERTIFICATIONS THIS COURSE SUPPORTS

TÜV Rheinland Functional Safety Engineer/Expert
Exida CFSE (Certified Functional Safety Expert)
Exida CFSP (Certified Functional Safety Professional)
ISA/IEC 61511 Certificate Programs

NO PREREQUISITES REQUIRED

Basic engineering knowledge helpful but not essential. Course covers fundamentals systematically. Suitable for beginners through experienced professionals expanding functional safety expertise.

FUNCTIONAL SAFETY CAREER OPPORTUNITIES

Professionals with IEC 61511 and SIS expertise earn competitive salaries:

Safety Engineer: $80,000 - $120,000/year
Functional Safety Consultant: $100,000 - $150,000/year
Automation Specialist (Safety Systems): $90,000 - $130,000/year
Process Safety Manager: $110,000 - $170,000/year

Salaries vary by experience, location, and industry but demonstrate strong earning potential for functional safety professionals.

WHY THIS COURSE STANDS OUT

Comprehensive 11.5-hour curriculum covering complete IEC 61511 safety lifecycle
28 quizzes providing hands-on practice (most courses have zero quizzes)
Real industrial disaster case studies showing consequences of safety failures
Practical SIS design examples with calculations and component selection
Clear explanations (100% rating) from knowledgeable instructor (100% rating)
Udemy Business approved for corporate safety training programs

Enroll now and master the functional safety skills that protect lives, assets, and the environment while advancing your career in process safety engineering.

Who this course is for:

Safety engineers implementing IEC 61511/61508 functional safety programs in process, oil & gas, or chemical industries
Instrumentation & control engineers designing, installing, and commissioning Safety Instrumented Systems for industrial plants
Process safety managers overseeing functional safety lifecycle, LOPA studies, and hazard analysis programs
Automation professionals programming safety PLCs, configuring logic solvers, and implementing redundant control systems
Project engineers managing SIS design, Safety Requirements Specifications (SRS), and Functional Safety Assessments (FSA)
Engineers preparing for TÜV Rheinland Functional Safety, Exida CFSE/CFSP, or ISA/IEC 61511 certification programs

IEC 61511 Functional Safety: SIS, SIL & Safety Engineering

What you'll learn

Explore related topics

Course content

Foundations of Industrial Safety and SIS6 lectures • 46min

Fundamentals of Industrial Automation8 lectures • 1hr 30min

Standards and Functional Safety5 lectures • 55min

SIS Components and Architecture8 lectures • 1hr 4min

SIS Design and Implementation6 lectures • 45min

Maintenance and Reliability5 lectures • 58min

Advanced SIS Concepts5 lectures • 39min

Safety Requirements Specification (SRS)5 lectures • 1hr 36min

Proof Testing and Troubleshooting5 lectures • 1hr 2min

Advanced Maintenance and Optimization3 lectures • 54min

Requirements

Description

Who this course is for: