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Messages - Taranabas

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Technical support / Re:One Wire Sensors
« on: December 15, 2017, 03:06:18 PM »
That is precisely what my plan of attack is, but it feels like a pretty roundabout way of doing it. Incidentally, for anyone who's interested in doing this, there's a pretty Arduino sketch for handling One-Wire here: http://www.cupidcontrols.com/2014/10/moteino-arduino-and-1wire-optimize-your-read-for-speed/

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Technical support / One Wire Sensors
« on: December 15, 2017, 09:03:50 AM »
Has anyone managed to/found any resources for interfacing Dallas Semiconductor One Wire sensors to a Tri Plc? It would be a really nice way to save I/O on a Nano as you'd be able to connect many sensors to one input. As far as I can tell, this is not possible with the current firmware - but perhaps this is something that could be implemented in the future or as a module interfacing to the 2x5 header similar to the the I2C module?

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Technical support / Re:Nano-10 to FMD88-10 Upgrade Question
« on: January 20, 2014, 12:11:25 PM »
Fantastic, Thanks!

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Technical support / Re:High Speed Timer
« on: January 14, 2014, 09:41:29 PM »
Just wanted to follow up on this thread. The STATUS(21) Solution worked beautifully. We are seeing consistent test results within 2-3 milliseconds from some of the better contactors. This little guy can even measure the time it takes to open a small 4 pole control relay, which is about 14ms. The SSR does not appear to be causing any noticeable error in the measurements, although we will have to verify this with a scope before we can put the timer into full-fledged use. Thanks guys!

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Technical support / Nano-10 to FMD88-10 Upgrade Question
« on: January 14, 2014, 09:34:18 PM »
I am working on a project with a Nano-10, and have realized more I/O would open up a lot of possibilities with it.
I'd like to make the move up to an FMD88-10.
My question is - Is the FMD capable of the same instructions as the Nano? Most importantly, the STATUS(21) command?

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Technical support / Re:High Speed Timer
« on: December 23, 2013, 06:32:20 AM »
I just attempted to implement this, but I just found that my PLC firmware is r74. What are my options here? Are there any other ways to obtain precise timing such as this or will I have to have r78 or greater? Can the firmware be upgraded?

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Technical support / Re:High Speed Timer
« on: December 18, 2013, 11:20:48 AM »
Ahh, I seem to recall learning that in school now that you mention it. It may be a necessary evil, as this is a 2400v carriage contactor, the coil has a rather large inrush and hold in current. I can't imagine a mechanical relay would be much faster than an ssr.

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Technical support / Re:High Speed Timer
« on: December 17, 2013, 11:13:31 PM »
Excellent, thank you for the suggestions! My initial thought was to use a pulse width measurement, but the more I thought about it the more convoluted it seemed it would be. On a side note, I am interfacing the 24v output with a solid state relay to energize the contactor. Any caveats with that?

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Technical support / Re:High Speed Timer
« on: December 17, 2013, 06:31:42 PM »
That is an interesting approach, does the status(21) fn return the number of CPU scans or an actual time value in microseconds?  I am using the plc to energize the contactor as well, would it be sufficient to use the de-energization of that output to trigger the cusfn, or is there a special reason you suggest using an input for this?


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Technical support / High Speed Timer
« on: December 17, 2013, 01:54:13 PM »
Hello, I would like to use a Nano-10 to determine how long it takes for a large relay to drop out. It typically takes 50-200 milliseconds for this to occur. As far as I know, the timer function only offers 0.01s resolution. Is there another way I could accomplish this?

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