Jump to content

Recommended Posts

  • MVP 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?

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

  • MVP 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?

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...