MVP 2023 Flex727 Posted October 22, 2021 MVP 2023 Report Share Posted October 22, 2021 Anyone have any experiences, good or bad, with using micro-SD card extenders with either a V1210 or a V700? I am currently experimenting with one, and as I expected, the PLC doesn't know if a card is inserted (always thinks one is present due to mechanical microswitch). But I'm finding that proper communication with the SD card is hit or miss. The PLC thinks the card is there but writes will often fail. It may be the cheap brand extender I'm playing with or something else - I don't know. Also, I haven't been able to find one that has a panel mount. Anyone ever seen one? Quote Link to comment Share on other sites More sharing options...
viscoelastic Posted October 26, 2021 Report Share Posted October 26, 2021 Hi Flex, I have yet to find a panel mount SD extension. Although not the best option, this is what I use. I cut a small slot in the face and screw it to a small piece of aluminum angle. If you do find a better solution, please share it with me/us. Quote Link to comment Share on other sites More sharing options...
AlexUT Posted October 26, 2021 Report Share Posted October 26, 2021 Unitronics has a small HelpDesk article about this: https://support.unitronics.com/index.php?/selfhelp/view-article/using-sd-card-extenders-with-unitronics-plcs B.R. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Flex727 Posted October 26, 2021 Author MVP 2023 Report Share Posted October 26, 2021 Thanks guys. If I find a better solution, I'll post. Visco, have you had any issues with reliability or issues with the fact that the PLC cannot see removal of the card? Quote Link to comment Share on other sites More sharing options...
viscoelastic Posted October 26, 2021 Report Share Posted October 26, 2021 13 minutes ago, Flex727 said: Visco, have you had any issues with reliability or issues with the fact that the PLC cannot see removal of the card? I have had zero issues with doing this. I will also add that one of these is in the same small enclosure that I have SSR's and high voltage going to heaters for a test apparatus and have still not had any issues. Reading the TB that AlexUT posted, I don't see why you could not loop the wires through a ferrite bead or donut/choke to reduce any minor EMI. It would look like crap but you could also separate all the strands then twist them back together with a choke. I have those extenders in 3 pieces of test equipment that we built. We are using them to write a continuous log during tests. Mind you, I am a chemist, not an electrical engineer, all those ideas to reduce EMI work awesome in my mind, but in reality may differ. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Flex727 Posted October 26, 2021 Author MVP 2023 Report Share Posted October 26, 2021 Thank you visco. My projects rarely involve areas with high EMI so I think it will be fine. 14 minutes ago, viscoelastic said: We are using them to write a continuous log during tests. Do you have any special code to deal with the possibility that the card might be removed? Quote Link to comment Share on other sites More sharing options...
viscoelastic Posted October 26, 2021 Report Share Posted October 26, 2021 2 minutes ago, Flex727 said: Do you have any special code to deal with the possibility that the card might be removed? Other than the threat of broken fingers? No, I don't have anything written in. I have learned that every time I make something idiot proof, God creates a better idiot. 1 Quote Link to comment Share on other sites More sharing options...
MVP 2023 Flex727 Posted October 26, 2021 Author MVP 2023 Report Share Posted October 26, 2021 12 minutes ago, viscoelastic said: I have learned that every time I make something idiot proof, God creates a better idiot. Ha ha ha! Pure philosophical truth there. Quote Link to comment Share on other sites More sharing options...
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