Board Selection: Mesa 7i95?

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11 Nov 2020 22:22 #189054 by Joz
Hello! First off, I am very new to LinuxCNC, so please be patient with me!

I'm building a CNC machine that will use closed-loop stepper motors and I want to also use linear encoders on all three axes to make the machine as accurate as possible. As I understand it, the 7I95 is the proper board for this, but I found an example of someone using a 7I96 + 7I85 to accomplish the same thing. I think the main difference here is price and latency, but I'm not sure if there's something I'm missing. Any and all advice would be greatly appreciated!

PS: The CNC will be 3 axes, with a potential 4th axis in the future, with no linear encoder

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11 Nov 2020 22:27 #189056 by PCW
Replied by PCW on topic Board Selection: Mesa 7i95?
A 7I96+ 7i85 will work as will a 7I76E + 7I85

A 7I95 will work but I would not suggest it for a first time
LinuxCNC user since there is no graphic configurator
and it requires LinuxCNC 2.9

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14 Nov 2020 21:46 #189383 by Joz
Replied by Joz on topic Board Selection: Mesa 7i95?
Thanks for the info! Looking at these boards it seems like the 7I76 would be overkill for me. I just need the ability to connect my linear encoders and limit switches, and since the 7I85 will give me plenty of I/O I don't see an issue here, especially since they're both ethernet enabled cards. Although, would the 7I76E need the 7I85? It seems like it has enough I/O ports on its own, but I'm guessing I'm missing something. Thanks!

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14 Nov 2020 21:53 #189385 by Joz
Replied by Joz on topic Board Selection: Mesa 7i95?
Also, what is the correct way to power these boards? I know I read in another forum post that you can use 24v or 24v and 5v (which I guess you would do if you're worried about noise with the I/O?). But glancing through the manual I don't see rated amps anywhere. Thanks!

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14 Nov 2020 21:57 #189389 by PCW
Replied by PCW on topic Board Selection: Mesa 7i95?
The 7I76E can use 24V or a combination of 5V and 24V
The 7I95 is 5V only (though it has 5V to24V compatible I/O)

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17 Nov 2020 20:02 #189612 by Joz
Replied by Joz on topic Board Selection: Mesa 7i95?
Thanks for the info! Would the 7I76E need the 7I85 for this application? It seems like it has plenty of I/O on its own, but I'm guessing I'm missing something. Thanks!

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