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20 or 25 MHz (2.4x or 3x faster than the default 8.3333 MHz), works fine with no skew added.
I would be comfortable with those settings.

The frequency value you set will be rounded to the closest available frequency
= an integer division of the 100 Mhz FPGA ClockLow. This is easy to test with halshow.

As you go faster, the timing margins become smaller and you must adjust to the delay in
the actual hardware multiplexing with the skew adjust (in ns) but at the higher speeds
the timing variations over voltage and temperature limit the practical maximum.

That is, I can get all encoders to work with a 50 MHz mux rate (and 20 ns skew) but I would not trust
it without doing at least a temperature cycle.

Timing errors will show up as even/odd encoder swaps or crossover between even/odd encoders
so don't experiment on a powered servo system...

tuxcnc wrote:

rodw wrote:

I don't like using backports. Never have used them.
 
"I don't use it" and "I don't like it" are not substantive arguments.
The problem is that there are newer versions of the libraries in the newer release. First of all, it is about Python, in which the authors constantly change or remove something, so even relatively new programs (from a year or two ago) do not want to run, or some of their functions do not work.
However, backports repositories are optional, you can activate them, install only what you need and then turn them off again.

The reason I don't like backports is it can land you in dependency hell as you point out. That's my substantive argument.
I've been in this position needing a later kernel to support my hardware. Today, I would either compile the kernel and be done with it or use apt pinning to be very selective on what packages I obtain from unstable.

Hello everyone I have a new issue with my plasma table. So after I home my machine, load the file, zero the machine, and click cycle start my z axis torch travels up into the home switch instead of going down and probing the sheet of steel. I ran an mdi comand "g0 z-.5 and when I hit enter the torch moved down -.5 like it should so I dont think anything is reversed. The gcode file I am using worked in the past so im am just at a loss. Is there a certain amount of travel the torch is supposed to go up initially that I could maybe adjust to fix this? 

 
 

You could use one of the Mesa 7i76e's not very accurate analog voltage input pins and a 10k resistor to form a voltage divider. at 25 deg C, and 24 volt field power, the voltge will be 12 volts. You might need to scale this with lincurve or a custom component. Accuracy of +- 2 degrees due to 8 bit conversion is probably OK for this application.

Moved to "driver boards".
-
I think 7i76 has 4 low resolution analog inputs, so maybe one of those could be used, but i never used it for temperature. I did use them for servo load from the drive, and it worked perfectly fine for my case.
Did not use other two so i can not dispense info.

I have a Jianken 3.2kw spindle that has a NTC 103F3950 (10 kΩ, B=3950) thermistor and a Thermal fuse / PTC-type cutoff.
My controllers are Mesa 7i76e + 7i78 + 7i89.
How do I make use of these and connect them to my controllers.

Oh, yes I understand,
Thx

Gotrune wrote:

[code][code]my high-resolution optical scales (...) are dropping pulses during high acceleration

[/code][/code]

Acceleration has nothing to do with it.
Only maximum speed matters.
From the resolution and speed you will calculate the pulse frequency.

Hi PCW,

Thank you so much for the incredibly fast reply!

I will add setp hm2_7i97.0.encoder.muxed-sample-frequency 20000000 to my HAL file right away and test the machine.

Just to make sure I fully understand the limits of the hardware: what are the acceptable or maximum values for this parameter with the standard 7i97T bitfile? For example, does it need to be a specific integer divisor of the base clock? Also, at what frequency would I typically need to start adjusting the muxed-skew parameter you mentioned?

Thanks again for your time and excellent support!

I would try setting:

hm2_7i97.0.encoder.muxed-sample-frequency

to say 20 MHz

(you can probably go higher by futzing with the muxed- skew parameter)
 

mesaboard is on 2. enp8s0 (see alsö static inet/inet6 addresses) It does show no carrier when unplugged.

eno1 (internet) has automatic connection method.

wlan has been turned off in order not to get confused.

I changed lan cables and now it behaves as it should mesact/machine finds the board and readhmid provides the information as expected.(mesact and terminal)
I wasnt aware of that since I did have acces to the internet anyhow(???).

so thank you very much for the moment This particular problem is solved.


Have nice days

geebee

please find attached 3 screenshots - left side are all the pins for cia402 component (they did all fit in screen) and right side is list of lcec pins in terminal. do you have any idea, which of these is "enable" pin? lcec.0.state-preop, lcec.0.state-safeop and lcec.0.state-op seem suspicious to me but then I do not understand why would 3 pins be needed. I would appreciate some hints on which pins should I try for enabling the drive and which would be most suitable candidate for making the motor spin. cia402.0.velocity-cmd would seem like most obvious candidate but is there anything else to add (so far in my experience it would have been 2 pins - one sets velocity, the other would be a bit output for "run/stop")
BTW cia402.0.controlword has value 4, which seem to match instructions in manual to set the parameter 50.04 to 4 (which means that reference is speed). does that help in any way? and since the manual says this:"Ensure the drive profile parameter 51.02 is set to CiA402 (0)" I would like to think that it's all good regarding the suspicion about needing different mode rather than cia402.
could you please share some link where I could see some cia402 templates that you mentioned?

I just try to set the card to work.

For the beginning, I want it to get a single stepper motor to turn with nothing else connected to it. For this, I need to configure some hal and ini files. I can use mesact but not pncconf for this.Later, I will analyze and try to understand these first files according to linuxcnc docs. What i intend to do is retrofitting a lathe to cnc (two, maybe three axes) , an additional axe for an attached lathe and on for a dividing head and some encoders /DRO This is all I might need in the (far) future.

Right now, I would just be happy to get linuxcnc, mesact ,board and stepper (driver) "Talk to one another".

cheers

geebee

OK so the next question is which Ethernet interface is the 7I95T connected to?
(enp8s0 or eno1)

(quick way to check is unplug the 7I95T RJ45 cable and see which interface shows "NO-CARRIER"