Jump to content

Leaderboard

Popular Content

Showing content with the highest reputation since 06/28/2021 in all areas

  1. You've got the polarity on the outputs wired as sinkers, not sourcers. The T2 outputs are PNP type. Your wiring would work if you had a -TR20, where the outputs are NPN type. Don't forget to connect power on the output connector as well. Hook it up like this for a -T2: If you've got 2K resistors that's fine - all you're trying to do is limit the current through the optocoupler. We use 2.2K resistors. If you want to go all OCD and calculate the current through the optocouplers go right ahead. You may not be happy with this setup, as the max frequency in the spec sheet on the -T2 is 500 Hz. I have put a scope on this and the waveform gets triangle shaped the faster you go and becomes unusable at about 1200 Hz. Your results may vary. The -TR20 board using the dedicated HSO NPN outputs is MUCH faster, with a maximum speed of 200 kHz. I've been down this road and the PNP outputs are horribly slow for a stepper. There are other models that have the NPN HSO outputs as well. Just not the -T2. Joe T.
    1 point
  2. You can find original Helpdesk article at next link: Prepare Disk on Key (DOK) or SD card to work with PLC https://support.unitronics.com/index.php?/selfhelp/view-article/prepare-disk-on-key-dok-or-sd-card-to-work-with-plc
    1 point
  3. Just for fun I wrote the program for the above.
    1 point
  4. I'm giving this a bump as I still hate having to do so much to get into the name of the project that is actually in the plc. @Cara Bereck Levy Surely this isn't too hard to achieve. Would save a lot of hassle. cheers, Aus And here's the pic again without needing a download! Look carefully, young Luke.
    1 point
  5. Thank you for your feedback. These are functions that I also use, and reading the problem and the answer, I would not have thought that the SD card could have problems, and that it appears like this. It is very nice of you to share the troubleshooting. Is it possible to know the content of the manual for resetting the card with the mentioned software? Best regards
    1 point
  6. I can just imagine an audiophile with the most expensive valve amps and super duper turntable sitting back with their $10K headphones on, listening time and again to Ding.wav, savouring every moment. 🎵 🎧 Kratmel, you've really hit the "I don't believe someone actually made this" jackpot this time. Is it from M$oft? cheers, Aus
    1 point
  7. You could always go for a "hardware" solution. 1). Get rid of the RJ connector and solder the lead directly to the relevant pins. A bit more fiddly if it ever needs changing, but then again it will always have great contact. 2). Smother the RJ with hotmelt glue so that it can't be unplugged. Hotmelt can be useful at times, as it can be "released" or "reapplied" with a bit of judiciously applied heat. 3). Make a lockable (steel or ally) box that mounts around the back of the plc. If it is mounted in a door then this is an easy thing to do, (as against on a din rail), and it also gives you much more RF protection. You must fit an earth lead to it if you go this way, ensure that all cable entries cannot chafe and that some ventilation is still possible. Been there, done that...in the name of RF immunity. 4). Hire a grumpy old man from the local old folks home to sit by the plc during use, armed with a big foam bat...... Hey, that'll be me in a few more years. 🙂 cheers, Aus
    1 point
×
×
  • Create New...