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7I84 Max Input Frequency

  • nwallace
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24 Sep 2023 02:57 #281531 by nwallace
7I84 Max Input Frequency was created by nwallace
I have a situation where I need to be able to read a 24v sensor up to about 1000hz. Does anyone know if the inputs on a 7I84 are capable of reading that?

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24 Sep 2023 05:18 #281535 by rodw
Replied by rodw on topic 7I84 Max Input Frequency
the manual says 10 kHz (10,000 Hz)

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24 Sep 2023 05:28 #281536 by nwallace
Replied by nwallace on topic 7I84 Max Input Frequency
Thanks! I looked through it and just didn't see it.

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  • tommylight
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24 Sep 2023 17:37 #281551 by tommylight
Replied by tommylight on topic 7I84 Max Input Frequency
10KHz would require a 100000ns servo period, i have gone to 250000 and that worked perfectly through Ethernet and PCI-E.

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24 Sep 2023 20:38 #281564 by rodw
Replied by rodw on topic 7I84 Max Input Frequency
I nearly said earlier that you might be better off using an encoder input which is what is done when using a THCAD.
You can scale the resulting velocity in hal
That way its not dependent on the servo thread.

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24 Sep 2023 23:55 #281567 by tommylight
Replied by tommylight on topic 7I84 Max Input Frequency

I nearly said earlier that you might be better off using an encoder input which is what is done when using a THCAD.

I thing PCW mentioned that can do 10MHz, i have tested a bit over 1MHz, did not have anything faster. :(

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25 Sep 2023 18:31 #281605 by micges
Replied by micges on topic 7I84 Max Input Frequency
7i84 will easily read 4kHz input with 5i25
The following user(s) said Thank You: tommylight, JT

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