ISA Interchange

Welcome to the official blog of the International Society of Automation (ISA).

This blog covers numerous topics on industrial automation such as operations & management, continuous & batch processing, connectivity, manufacturing & machine control, and Industry 4.0.

The material and information contained on this website is for general information purposes only. ISA blog posts may be authored by ISA staff and guest authors from the automation community. Views and opinions expressed by a guest author are solely their own, and do not necessarily represent those of ISA. Posts made by guest authors have been subject to peer review.

All Posts

What Is Functional Safety?

Functional safety focuses on the detection of a potentially dangerous condition and depends on automatic protection or correction to prevent an unwanted consequence or reduce its severity. The automatic protection system is designed to respond appropriately to errors, hardware failures, and operational stressors.

When every specified safety function is carried out and meets the set level of performance, functional safety is achieved. This requires a process that includes:

  • Identifying the required safety functions, usually through HAZIDs, HAZOPs, reviews of accidents, and process reviews
  • Assessing the risk reduction required; setting a safety integrity level (SIL), which applies to the safety instrumented function (SIF) intended to prevent the hazardous event
  • Ensuring that the safety function performs under various conditions, including failure modes and operator error; personnel must be qualified and competent to test these functions against IEC/ISA 61511
  • Verifying that the system and software meets the assigned SIL by determining the probability of failure, checking minimum levels of redundancy, and reviewing systematic capability; these three metrics are often called “the three barriers”
  • Conducting regular safety audits to make sure that the appropriate safety lifecycle management techniques have been applied throughout the life of a product or system

The functional safety lifecycle provides an end-to-end approach, beginning at the concept design phase and ending at decommissioning. It’s a closed loop model that identifies and assesses risks, creates a design, and then implements, verifies, and maintains that design.

Learn More

The International Society of Automation (ISA) can help your company advance its safety goals.

Contact one of our experts to talk about your safety training options with ISA:

Heidi Cooke, PMP
Senior Workforce Development Consultant
hcooke@isa.org
+1 919 990 9405

Matt Rothkopf
Team Leader and Senior Workforce Development Consultant
mrothkopf@isa.org
+1 919 990 9403

Jennifer Halsey
Jennifer Halsey
Jennifer Halsey was the director of marketing and communications for ISA.

Related Posts

Protecting Electrical Terminal Blocks from Tampering

Electrical terminal blocks are a common sight in the automation world. Usually mounted on DIN rail in ind...
Anna Goncharova Nov 8, 2024 10:30:00 AM

How to Access ISA Technical Content

You Have Questions? ISA Has Answers. Serving up member-generated technical content related to standards, ...
Renee Bassett Nov 5, 2024 7:00:00 AM

Exploring Zero Trust in Operational Technology

Zero trust has become the top approach for IT security, guiding how organizations worldwide design their ...
Muhammad Musbah Nov 1, 2024 7:00:00 AM