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Safety Instrumented Systems and SIL to IEC 61511
The protection layer that acts once control has already failed: why the SIS is kept apart from the BPCS, safety instrumented functions written with a trip point and a safe state, LOPA and the SIL target, PFDavg arithmetic, sensors, logic solvers and shutdown valves, de-energise against energise to trip, bypass and MOS discipline, 1oo2 and 2oo3 voting, common cause failure, the safety requirements specification, application programs, validation, proof testing and repair deferral.
Inside the course
From the lessons
Why a plant needs a safety layer
Instrumentation Tools
Functional safety, IEC 61508, IEC 61511 and LOPA
Instrumentation Tools
The SIS loop end to end
Instrumentation Tools
Redundancy, voting and safety architecture
Instrumentation Tools
The safety requirements specification
Instrumentation Tools
The application program in the safety logic solver
Instrumentation Tools
Lesson frames belong to the creators named in the Credits below and are shown from YouTube.
What you will learn
Explain why a safety instrumented system is kept independent of the control system; write a safety instrumented function with a trip point, a safe state and a response time; follow a LOPA to a SIL target and check it against a PFDavg calculation; choose a voting architecture from the SIL target and the cost of a spurious trip; find the common causes that quietly defeat redundancy; read a safety requirements specification and name what is missing; plan a validation test and a proof test that actually finds dangerous undetected failures; and run bypasses, overrides and repair deferrals with a record that stands up to an audit.
- Say in one paragraph why a safety instrumented system is kept independent of the basic process control system
- Write a safety instrumented function with a trip point, a safe state and a response time a designer can build from
- Follow a LOPA to a SIL target and check it with a PFDavg calculation and a proof test interval
- Choose between 1oo1, 1oo2, 2oo2 and 2oo3 using the SIL target and the cost of one spurious shutdown
- Find the shared impulse lines, supplies and procedures that defeat redundancy, and read a safety requirements specification for what is missing
- Plan a validation test and a proof test, and run bypasses, overrides and repair deferrals with an auditable record
Course content
15 modules · 49 lessons · 11h 9m
In order, at whatever pace suits you. Each module ends with a practice task that builds on the last, and a short quiz.
- 01Why a plant needs a safety layer4 lessons39m
- 02BPCS, SIS and the safety instrumented function3 lessons35m
- 03Functional safety, IEC 61508, IEC 61511 and LOPA3 lessons49m
- 04PFD and the reliability arithmetic behind SIL3 lessons32m
- 05The SIS loop end to end4 lessons1h 1m
- 06Trip philosophy, fail-safe design and overrides4 lessons56m
- 07Redundancy, voting and safety architecture3 lessons59m
- 08Common cause failure and how SIS equipment fails4 lessons50m
- 09The safety requirements specification4 lessons50m
- 10SIS design and the documents it produces2 lessons27m
- 11The application program in the safety logic solver3 lessons36m
- 12Validation, verification and the SIS work process4 lessons1h 3m
- 13Proof testing instruments and valves4 lessons59m
- 14Maintenance, repair deferral and engineering practice4 lessons53m
- 15Final assessment0 lessons0m
Requirements
- Who it is for
- Advanced. Assumes PLC or DCS basics and some field instrumentation experience, so it is best taken after any of the free PLC or DCS courses. No coding and no software licence needed.
- Software
- None required.
- Hardware
- None required. Access to a plant P&ID and a cause and effect chart makes the practice tasks real.
Safety Instrumented Systems and SIL to IEC 61511 at a glance
Safety Instrumented Systems and SIL to IEC 61511 is a free, self-paced online safety course from EDWartens India with 15 modules, 11h 9m of video lessons, written notes, practice tasks and assessments, and an optional verifiable certificate.
- Price
- ₹0, free for good. No trial, no card. Comparable classroom training of this length costs about ₹7,999.
- Format
- 15 self-paced modules, 11h 9m of video, written notes, a quiz per module and a final assessment.
- Level
- Advanced. Advanced. Assumes PLC or DCS basics and some field instrumentation experience, so it is best taken after any of the free PLC or DCS courses. No coding and no software licence needed.
- Brand
- Vendor-neutral
- Software
- None required.
- Hardware
- None required. Access to a plant P&ID and a cause and effect chart makes the practice tasks real.
- Certificate
- Optional EDWartens Certificate of Completion, verifiable by code. Not a vendor credential.
- Video lessons by
- Instrumentation Tools (independent creators, credited below)
- Language
- English
A shareable EDWartens certificate
Finish every module and pass the final assessment, and the optional EDWartens certificate is yours. It carries a unique verification code on a public page anyone can check, so it stands up when a recruiter looks it up. See it below.
- Add it to your LinkedIn profile in one click
- Link it from a CV or portfolio, the URL is permanent
- Publicly verifiable by code, not a PDF anyone can edit
- Issued by EDWartens India, the training centre itself
The course itself stays free whether or not you ever buy one.
Stuck? Ask a practising engineer
A free course usually means a comment section and hope. This one does not. Every module has an Ask-your-trainer panel that reaches the same engineers who teach our paid programme: people who commission panels for a living, not moderators.
- Questions answered in the context of the module you are on
- The same engineers who teach the AEP programme
- Career tools, CV help and public job listings included
- Your progress and notes stay in your account for good
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Reviews here are written only by learners who have finished every module of Safety Instrumented Systems and SIL to IEC 61511, and they are published exactly as written. Finish the course and yours will be the first.
Common questions
Is the course really free?
Yes. Every module, practice task and assessment. You create an account so your progress is saved and the assessments can be marked. The certificate is the only paid item, and only if you want it.
What certificate do I get?
An EDWartens Certificate of Completion, issued when you have finished every module and passed the final assessment at 70 percent, with a verification code anyone can check. It is not a vendor credential and is never described as one.
Is this the same as a TUV or exida functional safety engineer certification?
No, and it is not equivalent to one. Those are paid, examined certifications awarded by certification bodies and they have their own fees, syllabus and eligibility rules. This course is preparation: it teaches the subject those exams are built on, so you arrive knowing the material rather than meeting it for the first time in a classroom.
Who made the video lessons?
Instrumentation Tools, on their own YouTube channel, credited in the Credits block at the foot of this page. EDWartens did not make the videos and the creator is not affiliated with EDWartens. What EDWartens wrote is the study plan, the notes, the practice tasks and the assessments.
What should I know before starting?
PLC or DCS basics and some field instrumentation experience. You should be comfortable reading a loop drawing and know what a transmitter, a solenoid and a shutdown valve do. Any of the free PLC or DCS courses on this site is enough of a foundation.
Do I need any software, hardware or a licence?
No. There is nothing to install and nothing to buy. If you can get hold of a P&ID, a cause and effect chart and a few SIS work orders from a plant you know, the practice tasks become much more useful, but the course works without them.
Does the course cover HAZOP?
No. It starts where the hazard study leaves off. LOPA, SIL determination, the SIL target and everything downstream of it are covered in full, but facilitating a HAZOP is a separate skill and this course does not teach it.
Who is it for?
Instrumentation, control, DCS and maintenance engineers in refineries, petrochemicals, chemicals, fertiliser and gas processing, EPC design engineers working on ESD and fire and gas packages, and instrumentation graduates who want to move towards the safety systems group rather than stay on general loop maintenance.
What you walk away with
Your certificate for Safety Instrumented Systems and SIL to IEC 61511
Finish the course, pass the final, and this is the document with your name on it.
Verifiable by anyone
A unique certificate number and a public verification page. A recruiter checks it in ten seconds.
Adds to LinkedIn in one click
Issuer, credential ID and URL prefilled, with 5 matching skills to pin to your profile.
QR code on the certificate
Scans straight to the verification page, so a printed copy proves itself.
Names what you can do
Lists the topics covered, from why a safety instrumented system is kept independent of the bpcs to validation, proof testing, bypass discipline and repair deferral.
A permanent link
Put it on a CV, a portfolio or an application. The URL never changes.
Earned, not attended
Issued only after every module and a final assessment at 70%, with three attempts. That is why it stands up.
Learning is free. The certificate is optional.
Add it now and pay only when you have finished the course, or come back for it later. One-off, ₹959, GST included, with a receipt.
Issued by EDWartens India (Wartens Automation Private Limited) as a Certificate of Completion for this self-paced course. It is not a vendor certification, a university award or a CPD-accredited activity, and it does not certify competence on live equipment. Delivered electronically; see the refund policy.
Credits
Who made the video lessons
The video lessons in this course were created by the people below, not by EDWartens. Every lesson streams from its creator's own YouTube channel; EDWartens neither hosts nor sells that footage, and the creators are not affiliated with EDWartens and do not endorse this course. What EDWartens wrote is the study plan, the notes, the practice tasks and the assessments.
- Instrumentation Toolsthe Safety Instrumented System training playlist, which supplies every video lesson in this course, from BPCS against SIS through LOPA, SIL and PFD to voting, the SRS, application programs, validation, proof testing and maintenance
If you are one of these creators and would like a lesson removed or credited differently, write to info@wartens.com.