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# The 61508 Association

Guidance in Compliance

## Sitemaps

- [XML Sitemap](https://61508.org/sitemap.xml): Contains all public & indexable URLs for this website.

## Pages

- [The 61508 Association](https://61508.org/) - The 61508 Association is a cross-industry group of organisations with an interest in functional safety, particularly in applying IEC 61508 correctly.
- [What is IEC 62061?](https://61508.org/knowledge/what-is-iec-62061/) - What is IEC 62061? IEC 62061 Ed2 is the Functional Safety standard for the machinery sector
- [T6A Symposium](https://61508.org/t6a-symposium/) - ​The association occasionally runs T6A symposium on functional safety for the benefit of its members to share knowledge and encourage development.
- [Join The 61508 Association](https://61508.org/membership/join-the-61508-association/) - Join The 61508 Association: Membership is open to companies or organisations engaged in functional safety and which support the Associations aims.
- [CASS](https://61508.org/cass/) - Conformity Assessment of Safety-related Systems. CASS is an open and transparent methodology for assessing compliance to IEC 61508 and related standards.
- [Membership](https://61508.org/membership/) - Membership: Our members are a mix of roles, responsibilities and competencies but collectively we have identified some main member benefits.
- [About The 61508 Association](https://61508.org/about-the-61508-association/) - About The 61508 Association: companies with an interest in gaining the full benefits of the successful implementation of IEC 61508 and related standards.
- [Downloads](https://61508.org/downloads/) - The 61508 Association and CASS Scheme Association document downloads page. This is where the CASS functional safety assessment template can be found.
- [Join the CASS Community](https://61508.org/cass/join-the-cass-community/) - Apply to join The CASS Scheme Association community online today (a.k.a the CASS community). The CASS community is for those interested in the CASS templates.
- [What is IEC 61508?](https://61508.org/knowledge/what-is-iec-61508/) - What is IEC 61508? IEC 61508 is the international standard for functional safety for electrical, electronic and programmable electronic safety related systems.
- [Contact](https://61508.org/contact/) - The 61508 Association and CASS Scheme Association contact us page. Here you can use a form to message the association with feedback or to ask questions.
- [Knowledge](https://61508.org/knowledge/) - Detailed knowledge on the standards and a download centre with documents intended for those needing a more in-depth consideration of technical issues.
- [Members](https://61508.org/membership/members/) - Members of The 61508 Association. Association Members Community Networking Consultants Manufacturers End Users Certification Bodies Conformity Assessment Class
- [Standards Development](https://61508.org/knowledge/standards-development/) - The 61508 Association is a nominating organisation for the BSI standards development and several members contribute to the revisions of many of these standards.
- [CASS Self-declaration](https://61508.org/cass/cass-self-declaration/) - The CASS Self-declaration scheme includes the ability to lodge a self-declaration with a ‘CASS appointed body’ so that an end-user knows it is accessible.
- [Apply for Membership](https://61508.org/membership/apply-for-membership/) - How can I join the 61508 Association? Applying is very easy as we have an online form. Apply for membership of the 61508 Association online today
- [CASS Assessors](https://61508.org/cass/cass-assessors/) - The CASS Registered Functional Safety Assessor scheme is a registration scheme for experienced functional safety assessors who use CASS. Become a CASS Assessors
- [What is Functional Safety?](https://61508.org/knowledge/what-is-functional-safety/) - Functional safety is the safety relating to the equipment under control and control system that depends on the correct functioning of the safety-related system.
- [Competence Guidelines](https://61508.org/knowledge/competence-guidelines/) - Competence guidelines: safety-related system competence management, a crucial component for all those involved in the safety system and software lifecycle.
- [Meetings Diary](https://61508.org/about-the-61508-association/meetings-diary/) - Meetings Diary. List of our upcoming meetings. Annual General Meeting Management Meeting AGM GM Management Committee Community Networking Working Group.
- [CASS Accredited Certification](https://61508.org/cass/cass-accredited-certification/) - ​In addition to using the CASS methodology for creating evidence of compliance it has also been used for many years by Accredited Certification Bodies to gain an extension to their scope to issue certificates of conformity to IEC 61508
- [Document Library](https://61508.org/document-library/) - The 61508 Association and CASS Scheme Association document library
- [Document Search](https://61508.org/document-search/) - The 61508 Association and CASS Scheme Association document search.
- [What is IEC 61511?](https://61508.org/knowledge/what-is-iec-61511/) - What is IEC 61511? IEC 61511 Ed2 is the Functional Safety standard for the process industry
- [Privacy Policy](https://61508.org/privacy-policy/) - The 61508 Association Privacy Policy. We take care of the information that you give us. If you have any questions, please just ask.

## Events

- [Annual General Meeting 2027/03 (attended by all T6A members and invited guests)](https://61508.org/events/annual-general-meeting-attended-by-all-t6a-members-and-guests-537-634-113/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [General Meeting 2027/02 (attended by all T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-2-739-430-963/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [Management Committee Meeting 2027/03 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-3-202-667-410/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Management Committee Meeting 2027/02 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-2-986-274-606/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Management Committee Meeting 2027/01 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-384-513-114/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [General Meeting 2027/01 (attended by all T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-556-445-266/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [T6A Symposium - Guidance in Functional Safety Compliance (FREE, open-to-all, and attended by those registered)](https://61508.org/events/t6a-symposium-guidance-in-functional-safety-compliance-attended-by-those-registered/) - T6A symposium is a full-day in-person networking event focussed on functional safety and safety-related systems.
- [General Meeting 2026/02 (attended by all registered T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-2-739-430/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [Annual General Meeting 2026/03 (attended online by all T6A members and invited guests)](https://61508.org/events/annual-general-meeting-attended-by-all-t6a-members-and-guests-537-634/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [General Meeting 2026/01 (attended by all T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-556-445/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [Management Committee Meeting 2026/03 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-3-202-667/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Management Committee Meeting 2026/02 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-2-986-274/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Management Committee Meeting 2026/01 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-384-513/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Management Committee Meeting 2025/03 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-3-202/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Annual General Meeting 2025/03 (attended by all T6A members and invited guests)](https://61508.org/events/annual-general-meeting-attended-by-all-t6a-members-and-guests-537/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [General Meeting 01/2024 (attended by all T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an AGM.
- [General Meeting 02/2024 (attended by all T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-2/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an AGM.
- [Annual General Meeting 03/2024 (attended by all T6A members and invited guests)](https://61508.org/events/annual-general-meeting-attended-by-all-t6a-members-and-guests/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an AGM.
- [General Meeting 01/2025 (attended by all T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-556/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [General Meeting 02/2025 (attended by all registered T6A members and invited guests)](https://61508.org/events/general-meeting-attended-by-all-t6a-members-and-guests-2-739/) - The General Meeting (GM) is the regular in-person gathering of the Association members. We hold three General Meetings each year, including an Annual General Meeting (AGM). General Meetings are an opportunity for in-person updates, presentations, discussions and networking but members can also join remotely, via MS Teams, if workload limits their options.
- [Working Group Meeting (attended online by all interested members)](https://61508.org/events/working-group-meeting-attended-online-by-all-interested-members-912/) - The Working Group Meeting (WGM) is to ensure the progress of Association working group tasks at least on an annual basis.
- [Management Committee Meeting 02/2025 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-2-986/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Management Committee Meeting 03/2024 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-3/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members.
- [Management Committee Meeting 02/2024 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-2/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members.
- [Management Committee Meeting 01/2024 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members.
- [Management Committee Meeting 01/2025 (attended online only by members of the management committee)](https://61508.org/events/management-committee-meeting-attended-online-only-by-members-of-the-management-committee-384/) - The management committee meeting is the Association management meeting attended by the Association officers and a small subset of managing Association members (please see the Association rules).
- [Working Group Meeting (attended online by all interested members)](https://61508.org/events/working-group-meeting-attended-online-by-all-interested-members/) - The Working Group Meeting (WGM) is to ensure the progress of Association working group tasks at least on an annual basis.
- [T6A Symposium - Guidance in Functional Safety Compliance (attended by those registered)](https://61508.org/events/t6a-symposium-guidance-in-functional-safety-compliance/) - ​The association occasionally runs a T6A symposium on functional safety for the benefit of its members to share knowledge and encourage development. The symposium is often also open to non-member functional safety practitioners to encourage networking. T6A symposium is a full-day in-person networking event focussed on functional safety and safety-related systems. Papers and workshops that

## Documents

- [T6A034 - BESS and Fuel Cell Systems Functional Safety Requirements (2026)](https://61508.org/document/t6a034-bess-and-fuel-cell-systems-functional-safety-requirements/) - A document discussing and translating the functional safety requirements for battery energy storage systems (BESS) and fuel-cells.
- [The CASS Registered Functional Safety Assessor Scheme Manual](https://61508.org/document/the-cass-registered-functional-safety-assessor-scheme-manual/)
- [T6A Symposium 2026 Invite](https://61508.org/document/t6a-symposium-2026-invite/)
- [RULES OF MEMBERSHIP OF THE 61508 ASSOCIATION](https://61508.org/document/rules-of-membership-of-the-61508-association/) - Edition 12: 19.11.2025
- [T6A041 - Reliability and Availability (2025).](https://61508.org/document/t6a041-reliability-and-availability-2022/)
- [CASS Functional Safety Management Declaration](https://61508.org/document/cass-functional-safety-management-declaration/) - Lodged with CASS appointed body
- [CASS-061 for the SCS safety lifecycle assessment (all aspects) to IEC 62061.](https://61508.org/document/cass-061-for-the-scs-safety-lifecycle-assessment-all-aspects-to-iec-62061/)
- [CASS-511-FSM for Functional Safety Management (FSM) and Lifecycle TOEs to IEC 61511-1](https://61508.org/document/cass-511-fsm-functional-safety-management-to-iec-615112016-amd12017/)
- [An Introduction to Functional Safety (for the IET)](https://61508.org/document/an-introduction-to-functional-safety-for-the-iet/) - By Peter Brown (Lloyd's Register / Chair) and Karl Ainscough-Gates (Fichtner Consulting Engineers / Promotions Officer).
- [Annual Membership Fees](https://61508.org/document/annual-membership-fees/)
- [08A - T6A-Event-2024-A08-Black-Box-Testing-SKuball](https://61508.org/document/08a-t6a-event-2024-a08-skuball/) - T6A Symposium 2024 Slot 08A - Black Box Testing
- [T6A Symposium 2024 Guide](https://61508.org/document/t6a-symposium-2024-guide/) - Guide and Agenda for T6A Symposium 2024
- [11A - Functional Safety and Communications V1 e092024](https://61508.org/document/11a-functional-safety-and-communications-v1-e092024/) - T6A Symposium 2024 Slot 11A - Functional Safety and Communications
- [10B - SIL Calculations and use of IEC 61508-6](https://61508.org/document/10b-sil-calculations-and-use-of-iec-61508-6/) - T6A Symposium 2024 Slot 10B - SIL Calculations and use of IEC 61508-6
- [10A - 1236-0002-0003KAG T6A symposium Functional Safety and Alarm Management](https://61508.org/document/10a-1236-0002-0003kag-t6a-symposium-functional-safety-and-alarm-management/) - T6A Symposium 2024 Slot 10A - Functional Safety and Alarm Management
- [09B - IEC 61508 - Why tool qualification_V2_cut](https://61508.org/document/09b-iec-61508-why-tool-qualification_v2_cut/) - T6A Symposium 2024 Slot 09B - Why Tool Qualification for IEC 61508
- [09A - T6A Symposium Presentation IEC 62061 and ISO 13849](https://61508.org/document/09a-t6a-symposium-presentation-iec-62061-and-iso-13849/) - T6A Symposium 2024 Slot 09A - Machinery Functional Safety with IEC 62061 and ISO 13849
- [07B - CASS-511 Workshop V1 e112024](https://61508.org/document/07b-cass-511-workshop-v1-e112024/) - T6A Symposium 2024 Slot 07B - CASS IEC 61511 Workshop
- [07A-1 - P1811240200 T6A AI and Functional Safety](https://61508.org/document/07a-1-p1811240200-t6a-ai-and-functional-safety/) - T6A Symposium 2024 Slot 07A Part 1 - FS and AI Risk Assessment
- [07A-2 - T6A AI and FS v4 (UKAEA)](https://61508.org/document/07a-2-t6a-ai-and-fs-v4-ukaea/) - T6A Symposium 2024 Slot 07A Part 2 - FS and AI
- [06B - CASS 61508 62061 Workshop V1 e092024](https://61508.org/document/06b-cass-61508-62061-workshop-v1-e092024/) - T6A Symposium 2024 Slot 06B - CASS IEC 61508 and IEC 62061 Workshop
- [06A - FSCySec T65 Symposium Nov24 vFinal](https://61508.org/document/06a-fscysec-t65-symposium-nov24-vfinal/) - T6A Symposium 2024 Slot 06A - Concerning Assumptions for Functional Safety and Cyber Security
- [05B - T6A Competency  DDM V6](https://61508.org/document/05b-t6a-competency-ddm-v6/) - T6A Symposium 2024 Slot 05B - The Importance of Competence
- [05A - Functional Safety Digitalisation  - Reduce the Burden](https://61508.org/document/05a-functional-safety-digitalisation-reduce-the-burden/) - T6A Symposium 2024 Slot 05A - Functional Safety Digitalisation - Reduce the Burden
- [04 - T6A Symposium - Importance of FSM](https://61508.org/document/04-t6a-symposium-importance-of-fsm/) - T6A Symposium 2024 Slot 04 - The Importance of Functional Safety Management (FSM)
- [03 - T6A Symposium - CASS and T6A History](https://61508.org/document/03-t6a-symposium-cass-and-t6a-history/) - T6A Symposium 2024 Slot 03 - CASS and T6A History
- [02 - T6A Symposium Presentation Colin Easton](https://61508.org/document/02-t6a-symposium-presentation-colin-easton/) - T6A Symposium 2024 Slot 02 - Todd-Parry Keynote
- [01 - T6A Symposium - Welcome V1 e092024](https://61508.org/document/01-t6a-symposium-welcome-v1-e092024/) - T6A Symposium 2024 Slot 01 - Welcome
- [CASS-508-PLC - PLC Subsystem Software TOEs to IEC 61508-3](https://61508.org/document/cass-508-plc-plc-subsystem-software/) - TOEs for the functional safety assessment of the safety logic / safety program within an already assessed / compliant PLC platform (e.g., Safety PLC with relevant 3rd party certificate).
- [CASS-508-SW for Software assessment to IEC 61508-3 (abridged for audit).](https://61508.org/document/cass-508-sw-for-software-assessment-to-iec-61508-3-abridged-for-audit/)
- [CASS-GUIDE-508-SW for guidance on Software assessment to IEC 61508-3 (full requirements).](https://61508.org/document/cass-guide-508-sw-for-guidance-on-software-assessment-to-iec-61508-3-full-requirements/)
- [CASS-511-LVL - Subsystem LVL Software TOEs to IEC 61511-1](https://61508.org/document/cass-511-lvl-subsystem-lvl-software/)
- [CASS-511-FSA for Functional Safety Assessment (FSA) TOES to IEC 61511-1](https://61508.org/document/cass-511-fsa-for-functional-safety-assessment-fsa-to-iec-61511-12017/)
- [CASS-511-OP for Operations and Maintenance TOEs to IEC 61511-1](https://61508.org/document/cass-511-op-operations-and-maintenance-toes/)
- [T6A045 - PFD Calculator V1.0 (2024)](https://61508.org/document/t6a045-pfd-calculator-v1-0/)
- [T6A044 - Staggered Proof Testing Coefficients (2024).](https://61508.org/document/t6a044-staggered-proof-testing-coefficients-2022/)
- [T6A043 - Fault Tolerant Systems (2024).](https://61508.org/document/t6a043-fault-tolerant-systems-2022/)
- [T6A042 - Effects of Proof Testing (2024).](https://61508.org/document/t6a042-effects-of-proof-testing-2022/)
- [MooN Safety Function Calculation Tool by I&E Systems - Publications (iesystems.com.au)](https://61508.org/document/moon-safety-function-calculation-tool-by-ie-systems-publications-iesystems-com-au/)
- [CASS-GUIDE-A for guidance on using the CASS methodology](https://61508.org/document/cass-guide-a-for-guidance-on-using-the-cass-methodology/)
- [Rules for use of the CASS logo (Applicable to certification bodies)](https://61508.org/document/rules-for-use-of-the-cass-logo-applicable-to-certification-bodies/)
- [CASS disclaimer (An important notice to all those using the CASS methodology)](https://61508.org/document/cass-disclaimer-an-important-notice-to-all-those-using-the-cass-methodology/)
- [Functional Safety Management Declaration to be lodged with CASS-appointed body (alternatively used as self-declaration)](https://61508.org/document/functional-safety-management-declaration-to-be-lodged-with-cass-appointed-body-alternatively-used-as-self-declaration/)
- [CASS-508-FSM for Functional Safety Management assessment to IEC 61508-1.](https://61508.org/document/cass-508-fsm-for-functional-safety-management-assessment-to-iec-61508-1/)
- [CASS-508-SLC for the overall Safety Lifecycle assessment to IEC 61508-1.](https://61508.org/document/cass-508-slc-for-the-overall-safety-lifecycle-assessment-to-iec-61508-1/)
- [CASS-508-SYS for the E/E/PE System assessment to IEC 61508-2.](https://61508.org/document/cass-508-sys-for-the-e-e-pe-system-assessment-to-iec-61508-2/)
- [CASS-508-SUB for Element and Subsystem assessment to IEC 61508-2.](https://61508.org/document/cass-508-sub-for-element-and-subsystem-assessment-to-iec-61508-2/)
- [Guidance on completing a CASS FSM declaration](https://61508.org/document/guidance-on-completing-a-cass-fsm-declaration/) - Introduction, background and guidance for completion of Part 3 of the CASS
- [T6A012 - SIL rated alarms – Can you really afford them? Key points for those considering having a SIL rated alarm under IEC 61508.](https://61508.org/document/t6a012-sil-rated-alarms-can-you-really-afford-them-key-points-for-those-considering-having-a-sil-rated-alarm-under-iec-61508/)
- [T6A011 - Where Process Safety meets Machine Safety A brief overview of combining machine and process Functional Safety.](https://61508.org/document/t6a011-where-process-safety-meets-machine-safety-a-brief-overview-of-combining-machine-and-process-functional-safety/)
- [T6A010 - Combined basic Process Control systems and Safety Instrumented Systems](https://61508.org/document/t6a010-combined-basic-process-control-systems-and-safety-instrumented-systems/) - A document to aid the demonstration of Independence between Control & Safety based upon both IEC 61508 2nd edition and IEC 61511 1st edition
- [T6A009 - IEC 61508 for Salespersons  promoting products and services for projects requiring compliance to IEC 61508 standards.](https://61508.org/document/t6a009-iec-61508-for-salespersons-promoting-products-and-services-for-projects-requiring-compliance-to-iec-61508-standards/)
- [T6A008 - IEC 61508 for Quality / Inspection Engineers  involved with a project using the IEC 61508 group of standards.](https://61508.org/document/t6a008-iec-61508-for-quality-inspection-engineers-involved-with-a-project-using-the-iec-61508-group-of-standards/)
- [T6A007 - IEC 61508 for Purchasers  purchasing goods and services for the IEC 61508 group of standards.](https://61508.org/document/t6a007-iec-61508-for-purchasers-purchasing-goods-and-services-for-the-iec-61508-group-of-standards/)
- [T6A006 - IEC 61508 for Project Engineers  and project managers undertaking a project using the IEC 61508 group of standards.](https://61508.org/document/t6a006-iec-61508-for-project-engineers-and-project-managers-undertaking-a-project-using-the-iec-61508-group-of-standards/)
- [T6A005 - IEC 61508 for Operators of plant or equipment that involve SIL rated safety functions, trips or interlocks.](https://61508.org/document/t6a005-iec-61508-for-operators-of-plant-or-equipment-that-involve-sil-rated-safety-functions-trips-or-interlocks/)
- [T6A004 - IEC 61508 for Maintenance Engineers undertaking installation and commissioning work under the IEC 61508 standards.](https://61508.org/document/t6a004-iec-61508-for-maintenance-engineers-undertaking-installation-and-commissioning-work-under-the-iec-61508-standards/)
- [T6A003 - IEC 61508 for Installers for those companies undertaking installation and commissioning work under the IEC 61508 standards.](https://61508.org/document/t6a003-iec-61508-for-installers-for-those-companies-undertaking-installation-and-commissioning-work-under-the-iec-61508-standards/)
- [T6A002 - IEC 61508 for Senior Management  overseeing applications that use the IEC 61508 group of standards.](https://61508.org/document/t6a002-iec-61508-for-senior-management-overseeing-applications-that-use-the-iec-61508-group-of-standards/)
- [Process Safety and Functional Safety - Can you spot the difference?](https://61508.org/document/process-safety-and-functional-safety-can-you-spot-the-difference/)
- [New approach to SIL verification: Paper presented by Mirek Generowicz of I&E Systems Pty - Australia](https://61508.org/document/new-approach-to-sil-verification-paper-presented-by-mirek-generowicz-of-ie-systems-pty-australia/)
- [The use of an operator as a SIL1 component: Paper presented by Andrew Derbyshire of DNV Ltd](https://61508.org/document/the-use-of-an-operator-as-a-sil1-component-paper-presented-by-andrew-derbyshire-of-dnv-ltd/)
- [Systematic capability for Elements: Paper presented by Paul Reeve of Silmetric](https://61508.org/document/systematic-capability-for-elements-paper-presented-by-paul-reeve-of-silmetric/)
- [Reassessing Failure Rate Data - Paper presented by Mirek Generowicz of I&E Ststems Pty - Australia](https://61508.org/document/reassessing-failure-rate-data-paper-presented-by-mirek-generowicz-of-ie-ststems-pty-australia/)
- [T6A017 - Basic Priciples for the Functional safety of Legacy systems (2009).](https://61508.org/document/t6a017-basic-priciples-for-the-functional-safety-of-legacy-systems-2009/)
- [T6A018 - Legacy System Management (2011).](https://61508.org/document/t6a018-legacy-system-management-2011/)
- [T6A019 - SIL Calculations - easy or difficult? A presentation by Sella Controls / Hima-Sella (2012).](https://61508.org/document/t6a019-sil-calculations-easy-or-difficult-a-presentation-by-sella-controls-hima-sella-2012/)
- [T6A020 - Cyber Security - Initial concepts (2014).](https://61508.org/document/t6a020-cyber-security-initial-concepts-2014/)
- [T6A021 - Combined BPCS and SIS Systems A document to aid the demonstration of independence between Control and Safety (2015).](https://61508.org/document/t6a021-combined-bpcs-and-sis-systems-a-document-to-aid-the-demonstration-of-independence-between-control-and-safety-2015/)
- [T6A022 - EPC Roles and responsibilities (2016).](https://61508.org/document/t6a022-epc-roles-and-responsibilities-2016/)
- [T6A023 - When Process Safety meets Machine Safety to aid understanding between the end user and machine builder (2016).](https://61508.org/document/t6a023-when-process-safety-meets-machine-safety-to-aid-understanding-between-the-end-user-and-machine-builder-2016/)
- [T6A024 - Proven in use (2017)](https://61508.org/document/t6a024-proven-in-use-2017/)
- [T6A028 - Cyber Security - An introduction for Functional Safety Systems (2017).](https://61508.org/document/t6a028-cyber-security-an-introduction-for-functional-safety-systems-2017/)
- [Practical SIS Design and SIL verification: Paper presented by Paul Reeve of Silmetric](https://61508.org/document/practical-sis-design-and-sil-verification-paper-presented-by-paul-reeve-of-silmetric/)
- [Demonstrating Prior Use: Paper presented by Dave Ransom](https://61508.org/document/demonstrating-prior-use-paper-presented-by-dave-ransom/)
- [Cyber security - Paper presented by Peter Brown of Siemens Ltd.](https://61508.org/document/cyber-security-paper-presented-by-peter-brown-of-siemens-ltd/)
- [Competency based assessment in Functional Safety: Paper presented by Mirek Generowicz of I&E Sysems Pty - Australia](https://61508.org/document/how-can-we-make-better-use-of-competency-based-assessment-in-functional-safety/) - The number of CFSE, ISA and TÜV Rheinland FS Engineer qualified people around the world has increased rapidly over the past few years. The question comes up frequently, which is the ‘better’ qualification?
- [61508 logo (png)](https://61508.org/document/61508-logo-png/)
- [61508 logo (gif)](https://61508.org/document/61508-logo-gif/)
- [CASS Registered Assessor application form](https://61508.org/document/cass-registered-assessor-application-form/)
- [61508 Membership Application Form](https://61508.org/document/61508-membership-application-form/)
- [Achieving Hardware Fault tolerence: Paper presented by Mirek Generowicz of I&E Ststems Pty - Australia](https://61508.org/document/achieving-hardware-fault-tolerence-paper-presented-by-mirek-generowicz-of-ie-ststems-pty-australia/)
- [T6A029 - ALARP - As Low As Reasonably Practical (2019)](https://61508.org/document/t6a029-alarp-as-low-as-reasonably-practical-2019/)
- [Guidelines for the use of the logo Guide for the use of the 61508 logo](https://61508.org/document/guidelines-for-the-use-of-the-logo-guide-for-the-use-of-the-61508-logo/)
- [What is functional Safety Management?  - A brief overview of what Functional Safety Managemenet includes](https://61508.org/document/what-is-functional-safety-management-a-brief-overview-of-what-functional-safety-managemenet-includes/)
- [T6A001 - IEC 61508 for Directors responsible for overseeeing projects that involve the 61508 group of standards](https://61508.org/document/t6a001-iec-61508-for-directors-responsible-for-overseeeing-projects-that-involve-the-61508-group-of-standards/)
- [T6A030 - Functional Safety Assessments (2019)](https://61508.org/document/t6a030-functional-safety-assessments-2019/)
- [T6A031 - The Requirements of a Design File for a Safety Instrumented System (SIS) in accordance with IEC 61511 (2020)](https://61508.org/document/t6a031-the-requirements-of-a-design-file-for-a-safety-instrumented-system-sis-in-accordance-with-iec-61511-2020/)
- [T6A032 - Considerations for Cybersecurity during the Safety Lifecycle (2020)](https://61508.org/document/t6a032-considerations-for-cybersecurity-during-the-safety-lifecycle-2020/)
- [T6A033 - FS Certificates and Safety Manuals (2022)](https://61508.org/document/t6a033-fs-certificates-and-safety-manuals-2022/)

## Categories

- [WGM](https://61508.org/mec-category/wgm/)
- [MCM](https://61508.org/mec-category/mcm/)
- [GM](https://61508.org/mec-category/gm/)
- [AGM](https://61508.org/mec-category/agm/)
- [T6A Symposium](https://61508.org/mec-category/t6a-symposium/)

## Document Categories

- [Technical papers and guides](https://61508.org/document-category/technical-papers-and-guides/)
- [T6A Summary Papers](https://61508.org/document-category/t6a-summary-papers/)
- [CASS Documents](https://61508.org/document-category/cass-documents/)
- [Example past technical papers presented by members](https://61508.org/document-category/example-past-technical-papers-presented-by-members/)
- [T6A Miscellaneous](https://61508.org/document-category/t6a-miscellaneous/)
- [T6A Membership](https://61508.org/document-category/t6a-membership/)
- [IEC 61508](https://61508.org/document-category/cass-documents/iec-61508/)
- [IEC 61511](https://61508.org/document-category/cass-documents/iec-61511/)
- [IEC 62061](https://61508.org/document-category/cass-documents/iec-62061/)
- [CASS Guide-A](https://61508.org/document-category/cass-documents/cass-guide-a/)
- [Excel Workbooks](https://61508.org/document-category/excel-workbooks/)
- [T6A Symposium 2024](https://61508.org/document-category/t6a-symposium-2024/)
- [T6A Symposium 2026](https://61508.org/document-category/t6a-symposium-2026/)

## Document Tags

- [rules of membership](https://61508.org/document-tag/rules-of-membership/)
- [annual-fees](https://61508.org/document-tag/annual-fees/)
- [application-form](https://61508.org/document-tag/application-form/)
- [Registered Functional Safety Assessor Scheme Manual](https://61508.org/document-tag/registered-functional-safety-assessor-scheme-manual/)
- [CASS Registered Assessor application form](https://61508.org/document-tag/cass-registered-assessor-application-form/)
- [for comment](https://61508.org/document-tag/for-comment/)
- [CASS Self-declaration Scheme](https://61508.org/document-tag/cass-self-declaration-scheme/)
- [IEC 60261](https://61508.org/document-tag/iec-60261/)
- [CASS Guide-A](https://61508.org/document-tag/cass-guide-a/)
- [IEC 61511](https://61508.org/document-tag/iec-61511/)
- [IEC 61508](https://61508.org/document-tag/iec-61508/)

## File Types

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## Document Download

- [document-download](https://61508.org/document-download/document-download/)