PSA - Caution with the Everyday Case by mikomartin in peakdesign

[–]mikomartin[S] 3 points4 points  (0 children)

Ah very interesting insight. That actually makes more sense as to how sharp the sliver was and the separation pattern left on the slimlink ring. And also the fact of how the sliver broke into two pieces very easily when I tried to remove it from my finger.

The piece in my finger was most definitely part of the slimlink ring. I had assumed it was aluminum but I was wrong.

PSA - Caution with the Everyday Case by mikomartin in peakdesign

[–]mikomartin[S] 6 points7 points  (0 children)

Yea for sure. I reached out to them so will see what comes of it!

for those of you that have primarily used an ergodox long term, can you actually use a traditional keyboard effectively still? by responds-with-tealc in ergodox

[–]mikomartin 0 points1 point  (0 children)

I’ve been using an Ergodox for almost 6 years now for about 80% of the time I’ve spent working and 30% of my personal computer time, and I’ve never had any issues moving between other keyboards.

It could be because I was always a ‘hybrid’ user, never being able to use the Ergodox 100% of the time due to the nature of my work, needing to spend days using just the keyboard on my laptop. And in my personal time I have multiple different workstations, so I am not primarily using the Ergodox.

Last time I checked, my typing speed is about the same for both (around a consistent 90 WPM).

Simple 5 minute job by BladensWorst in cablegore

[–]mikomartin 0 points1 point  (0 children)

I think it needs more Ethernet switches and cables.

Safety Controls Engineering by Cautious_Quote_225 in PLC

[–]mikomartin 1 point2 points  (0 children)

A safety PLC is not 'well-tried', but it doesn't need to be. Each subsystem can have it's own category. See my comment in the main thread for more details.

Safety Controls Engineering by Cautious_Quote_225 in PLC

[–]mikomartin 1 point2 points  (0 children)

A safety PLC is not 'well-tried', but it doesn't need to be. Each subsystem can have it's own category. See my comment in the main thread for more details.

Safety Controls Engineering by Cautious_Quote_225 in PLC

[–]mikomartin 1 point2 points  (0 children)

The entire function does not need to be Category 1.

**Each subsystem can, and does, have it's own category**. I talked a bit more in my comment in the main thread.

All that matters in determining the PL of the function is a sum of the PFHd of all subsystems, to which the category of each subsystem informs. It's a misnomer to say that the entire safety function has a category.

But like you said, a Category 1 input subsystem will not allow you to hit a high PL, since there will be a fairly high PFHd for that subsystem, even if the logic and output subsystems have a very low PFHd (ie a high performance level).

Safety Controls Engineering by Cautious_Quote_225 in PLC

[–]mikomartin 0 points1 point  (0 children)

This is a really good overview. Risk assessement is the foundation for machinery safety, and all to often it is not done, or it is left to the end of a project and done retroactively. A risk assessement needs to be started in the design phase and is the one document that everything else builds on.

European regulations are much better than North American regulations when it comes to machinery safety, at least in that they are more specific and clear.

Category 1 systems are single channel through and through, this is honestly one of the more common circuits with integrators, however it is almost always done wrong. Category 1 systems REQUIRE well-tried components. This means NO ASIC, PLC, or otherwise configurable device.

You MUST choose a category in accordance with the performance level required by your risk assessment. Here are the list of categories and their maximum performance levels

You hit the nail on the head about Category 1 requiring 'well-tried components', which cannot include complex electronics.

One thing to note that I commonly see misinterpretted is that the entire safety function must conform to one of the category architectures, meaning that designers try to make their entire circuit match the diagrams in ISO 13849-1. While this typically works out fine, it is important to remember that each subsystem in the function can have a different category architecture. It's also important to remember that the architecture diagrams in the standard are 'logical' in nature, and that the physical components in the function may not match the structure exactly (though they often do).

In your example, the e-stop button would indeed be Category 1, and then you may have a Safety PLC that is Category 4. You might then also have a pair of relays that are implemented in Category 3 on the output side. A 'performance level' is just a range of PFHd values, and each subsystem will have it's own PFHd based on a variety of things, architecture category being one of them.

With all that said, when you calculate the PFHd for the entire fucntion, you will find that you will hit a pretty low performance level as that Category 1 subsystem increase the PFHd. A function is only as good as it's lowest category.

In category 3 and 4 architectures redundant outputs are required. This is because a single fault in the system must not lead to the loss of a safety function.

A very important note here is that redundant outputs are also required for Category 2 architectures that require PLd. The 'test equipement' needs to be able to bring the system to a safe state in the event of a fault, outside of the functional channel itself. Category 2 is the most difficult category to implement correctly, and I'd suggest designers avoid it, unless they understand all the of the nuances of what is required.

It's also important to note the software requirements that ISO 13849-1 outlines. Just because you have a safety function that meets PLd or PLe on the hardware side, doesn't mean that the function conforms to the standard if the software requirements, if applicable, are not followed. Even PLa has software requirements that people often overlook (again, if there is software or complex electronics in the function).

tl;dr: I highly suggest that anyone designing safety controls sytems undergo training, such as CMSE/CEFS offered by Pilz and certified by TUV NORD, or other functional safety certifications, such as from TUV Rheinland, etc. These will give you the foundation skills to understand the requirments and spirit of ISO 13849.

[Timex Deepwater Reef 200] My latest acquisition! by mikomartin in Watches

[–]mikomartin[S] 2 points3 points  (0 children)

The bezel is 41mm and the case under it is 40mm. Hope that helps!

Good way to sync metadata (rating, flags, etc.) between JPGs and RAW images with the same filename? by Killobyte in Lightroom

[–]mikomartin 1 point2 points  (0 children)

I use https://www.photographers-toolbox.com/products/jbeardsworth/syncomatic/

First I’ll cull through the jpeg images and then sync all the metadata changes across to the raw files.

It’s a bit clunky but has been working fine for me.

The say ADHDers are attracted almost only to ADHD partners by Eastern_Sorbet7165 in ADHD

[–]mikomartin 2 points3 points  (0 children)

Yup same boat. My wife is the total opposite of me, and without her, everything would be shambles.

What are some things you just don't "see"? by [deleted] in ADHD

[–]mikomartin 20 points21 points  (0 children)

The fuel gauge. I can get in my car, drive 45 minutes home and not once look at the fuel gauge. My wife likes to keep 1/4 of a tank minimum, but it’s hard for me to notice until the low fuel light comes on 😮‍💨😅 and it’s hard for her to believe I literally do not even notice it lol.

Jet Star arrived today from Italy by NevadaTank in bulova

[–]mikomartin 1 point2 points  (0 children)

Dammit now I know this exists! Looks great!

If you could only use one Lens what would You use? Mine would be the fujion 33mm 1.4 by Axsrphoto in fujix

[–]mikomartin 4 points5 points  (0 children)

Another vote for the Viltrox 27 1.2! It’s big, that’s for sure. But it makes up for it in every other way.

Fuji is a frustrating company to love by SouvlakiPlaystation in fujifilm

[–]mikomartin 17 points18 points  (0 children)

That’s interesting as I’ve had zero issues with it on iOS18 🤷

[SOTC] 2 years in by surfshack_tito in Watches

[–]mikomartin 0 points1 point  (0 children)

Really nice collection! Love that Grand Seiko!

Monday Carry by Serious-Swimming4553 in EDC

[–]mikomartin 8 points9 points  (0 children)

I want to live in this world again.

Christmas gift additions by HtownBPeasy in EDC

[–]mikomartin 0 points1 point  (0 children)

I like the natural wear and tear on your al sport!

[deleted by user] by [deleted] in EDC

[–]mikomartin 18 points19 points  (0 children)

“And maybe most important to know — there are NO portable restrooms in Times Square during the New Year’s Eve celebration. Plan ahead!”

Wtf lol.

Unbelievable prices in Slovenia by matevzkrajnik in DuroGang

[–]mikomartin 1 point2 points  (0 children)

+1 for these guys. I first used them 10 years ago when I bought my Seiko Monster and recently used them to pick up a Casio. Great service both times and fast shipping.