Linux CNC Input Pins Error

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23 Dec 2022 14:44 #260153 by Stefan321
Hello,

so the input wanted to test but start because Linux cnc certainly not at all and gives the error that this pin is not available. with out put everything is fine.

The board is a 7I96S
Bit file 7I96s_7I85S

code:

# --- Home X ---
net home-x <= [HMOT](CARD0).inm.00.input-00

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23 Dec 2022 16:00 #260155 by PCW
Replied by PCW on topic Linux CNC Input Pins Error
That firmware is missing the inm module, here is an updated version:

File Attachment:

File Name: 7i92_7i76_...2-23.zip
File Size:125 KB
Attachments:

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23 Dec 2022 16:22 #260156 by Stefan321
thanks for the quick reply but is that possible, I have a 7i96s board.

and di bit file is 7i92.

they also told me that the 7i96s_7i85sd.bin would be the right one.

I've been trying for 2 days now so that the inputs work

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23 Dec 2022 16:37 #260157 by PCW
Replied by PCW on topic Linux CNC Input Pins Error
Sorry

File Attachment:

File Name: 7i96s_7i85sd.zip
File Size:298 KB

 
Attachments:

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23 Dec 2022 17:31 #260160 by Stefan321
so linux starts again it looks good, thank you, unfortunately I can't test the inputs here right now because they want 24v.

But I have a question about another point. what affects my servos.

when i start linux and activate it. always comes.



hm2/hm2_7i96s.9: stepgen.02.maxvel is too big for current step timings and position scale, clipping to max possible


I had an eding cnc board before.

and took over the data 1 to 1.
max speed are 5m/min
acceleration 10000

steps are 10000/5mm spindle pitch

so 2000 per 1mm

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23 Dec 2022 17:56 #260161 by tommylight

hm2/hm2_7i96s.9: stepgen.02.maxvel is too big for current step timings and position scale, clipping to max possible

That is just a warning, everything works but with a clipped maximum speed. We will get back to this later, after you make the machine move properly.

I had an eding cnc board before.
and took over the data 1 to 1.
max speed are 5m/min
acceleration 10000
steps are 10000/5mm spindle pitch
so 2000 per 1mm

Some of those are only OK if using a really lite 3D printer, otherwise acceleration of 10000mm/s/s is extremely high for a cnc machine.
Maybe a unit issue, LinuxCNC uses units per second in the ini file, not per minute.
Wizards might be using units per minute, though.

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23 Dec 2022 18:03 #260162 by Stefan321
yes, at the moment everything is a dry construction on my desk and I would also like to bring the glass scales back into the system.


what I noticed is not the acceleration, the problem is either the steps. I would like to leave it at 2000 because of the accuracy. or I can set the ferror/min_ferror extremely high. If I don't do that, linux cnc drops out at about 2m/min. with motion x follower error

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23 Dec 2022 20:14 - 23 Dec 2022 20:16 #260165 by PCW
Replied by PCW on topic Linux CNC Input Pins Error
The clipping warning is because you have incompatible step timings
for you current maximum velocity (83.33mm/sec) and resolution
(2000 steps per mm)

83.33 mm/s with 2000 steps per mm is a 166.66 KHz step rate
or a period of 6 usec, meaning the sum of steptime and stepspace
must be less than this (ideally at least 25% less).

As tommylight mentioned 10000 mm/s/s is quite high acceleration.
At 83.33 mm/s full speed, that's only 8.33 ms from 0 speed to full speed
Last edit: 23 Dec 2022 20:16 by PCW.
The following user(s) said Thank You: tommylight

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23 Dec 2022 21:16 #260167 by Stefan321
Unfortunately I can't quite follow you. since 83.33mm/s 5m/min are what I want. as g0 rapid traverse. I could theoretically reduce the 2000 steps to 1000, which would then be exactly 0.001mm resolution. I would prefer 2000 though. the step rate of 166.66 kHz wouldn't be that much, would it. the board should be able to do 10mhz or am I wrong. as I said at eding cnc, i could easily work with these settings but switch to linux because of the unlimited possibilities and the hope of the glass scale.

I know I'm new and I want a lot

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23 Dec 2022 21:20 - 23 Dec 2022 21:32 #260168 by PCW
Replied by PCW on topic Linux CNC Input Pins Error
The board can generate step rates to 10 MHz but if you have say:

steplength = 5000
and
stepspace = 5000

(those are in ns)

That limits the minimum step period to 10 usec (5000 ns + 5000 ns),
which is an equivalent maximum step frequency of100 KHz.
Last edit: 23 Dec 2022 21:32 by PCW.

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