October 26, 2026Episode 5747 min
S1E57 Clause 14
The SIS is built, tested, and waiting on the factory floor. Now comes installation and commissioning, where new problems can surface.
Episodes
56
Latest episode
Sep 2026
Language
EN-US
About the show
Welcome to the Kenexis Functional Safety Podcast! I'm Ed Marszal, President and CEO of Kenexis, a leading technical safety consultancy for the chemical process industry. With decades of experience in safety instrumented systems, I bring a unique perspective to this podcast, having actively contributed to the ISA 84 committee since 1994. In this inaugural season, we'll delve into the IEC 61511 standard, examining each word's significance. I'll provide detailed insights into the standard's interpretation and application, complemented by personal stories from my career and committee discussions.
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September 9, 2026Episode 5637 min
S1E56 Clause 13.2.4 to 13.2.7
During the Factory Acceptance Testing (FAT), you're going to find issues. You can’t fix them on the spot— you need to trace each one back to wherever it originated in the safety lifecycle and correct everything downstream from that point.
August 25, 2026Episode 5557 min
S1E55 Clause 13
Factory Acceptance Testing is where Ed Marszal picks up in Clause 13, starting with an admission: the clause title may be wrong, since 13.2 is called Recommendations when every other point-two clause in the standard states requirements. Scope matters here FAT applies to the SIS logic solver, the engineered, customized subsystem, not off-the-shelf field devices like a pressure transmitter. Ed works through the objective's three notes, then the twelve-bullet planning list in 13.2.2: black box functionality, performance, environmental, and power-failure testing, plus test cases, dependencies on other systems, personnel competency, hazard assessment, and documenting results, with a nod to using Kenexis® Open-PHA® checklists or Kenexis® Open-Audit™ to run it. The episode ends at 13.2.3's one-sentence requirement to test a defined version, with 13.2.4 through 13.2.7 held for next week.
August 11, 2026Episode 5451 min
S1E54 12.5 and 12.6
Clause 12.5 closes out the software section with the meat of application program testing: verification planning tied back to Clause 7, an independent competent-person review, and nine bullet points covering conformance testing, exercising all parts of the program, representative data ranges, negative testing, timing and sequence checks, communication overload stress tests, and integration with the actual logic solver hardware. Ed Marszal walks through each one, then covers I/O data mapping verification, impact analysis for mid-testing fixes, and the seven-item documentation requirement that insists on recording passing tests, not just failures. Clause 12.6 closes with methodology and tools: complying with vendor safety manuals, and five purposes your methods, techniques, and tools must serve. Throughout, Ed threads a running argument for automating this testing with tools like ProLyTx, tied to the newly rebranded Kenexis SIS software.
August 4, 2026Episode 5333 min
S1E53 12.4.3 and 12.4.4
The best and safest way to write software is to break things down into tested reusable modules...
June 16, 2026Episode 5244 min
S1E52 12.4
At the risk of saving you from hours of unnecessary work, in our latest episode, we tackle a surprisingly common habit: trying to do application program design and implementation at the exact same time. Tune in to hear why this happens, why it's a problem, and how to stop doing it! Grab your headphones and let's streamline your workflow!
June 1, 2026Episode 5142 min
S1E51 12.3.4 pt2 to 12.3.5
Designing software comes before writing it. We're still inthe design phase and will be for a bit… Listen in to this episode as the discussion of this topic continues.
May 18, 2026Episode 5053 min
S1E50 12.3
To clarify, the standard separates application program design from its actual implementation. It feels like a bit much… Join us for our 50th episode as this is discussed in more detail!
May 4, 2026Episode 4951 min
S1E49 12.2.6 to 12.2.9
The startup sequence of a Safety Instrumented System (SIS)represents a critical vulnerability phase, as it triggers initialization code that rarely executes during steady-state operation. Join us as this important topic is discussed in this episode.
March 30, 2026Episode 4847 min
S1E48 12.1 to 12.2.5
The first technical safety standard ISA84 didn’t talk about programming in it at all. So, we decided when we added it, wewould wildly over complicate the situation…
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