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It's a little odd because muxed cards are intended for encoders, so muxed encoders
and muxed stepgen index signals assume that there are an equal number of stepgens
and encoders. This could be fixed by adding a new pin type (muxed stepgen IDX)
but that would also require LinuxCNC driver changes, at least if done right.  

Here is an attempt:

 

I believe this has the stepgen index mapping the same as yours
for the first 6 indexes (0..5) , but then uses standard encoder pinout
for stepgen index 6 and 7 (since this allows 2 full encoders with shared
stepgen/encoder index pins) 

So you get 8 stepgen index pins, 3 working encoders (2 on the 7I85S and 1 on the 7I76EU)

A disadvantage of this current scheme will be that you need to enable all the encoders
even though only 3 are actually usable. I will take a look at better support for stepgen index
inputs using muxed cards, but as I mentioned, this will require LinuxCNC driver changes

I will take a look at fixing this but as I mentioned

Hi,
I was hoping someone might have a firmware file for a 7i76eu & 7i85S that enables the stepgen index homing.  Or if anyone has any links on how to make custom firmware I downloaded the source file and found a post with the necessary changes, but I'm not sure how to compile the firmware.

I didn't have enough encoder inputs so I only connected the index signals from my servo drives to the 7i85S encoder inputs.  Thanks in advance for the help.  

X-Axis ---> stepgen.00 --> hm2_7i76e.0.encoder.00.input-a
Y-Axis ---> stepgen.01 --> hm2_7i76e.0.encoder.00.input-b
Y2-Axis ---> stepgen.02 --> hm2_7i76e.0.encoder.00.input-index
Z-Axis ---> stepgen.03 --> hm2_7i76e.0.encoder.01.input-a
A-Axis ---> stepgen.04 --> hm2_7i76e.0.encoder.01.input-b
B-Axis ---> stepgen.05 --> hm2_7i76e.0.encoder.01.input-index
C-Axis ---> stepgen.06 --> hm2_7i76e.0.encoder.02.input-a

Hi everyone,I’m planning to rebuild one of my CNC mills and would like to use a Mesa 7I76E for axis and I/O, together with a Lichuan LC10E20E EtherCAT servo drive for the spindle.Has anyone here set up a similar configuration and can share their experience with this servo drive?One drawback of this setup is that I’ll need a PC with either three Ethernet ports or two plus Wi-Fi. I’d prefer a fully wired connection (to avoid potential noise issues), I’m looking for recommendations.Do you have suggestions for suitable hardware that would work well with this setup?Greetings from Germany

The code in my hal file is now
# --- SPINDLE-AT-SPEED ---
net ext_spindle-at-speed <= hm2_7i76e.0.7i76.0.0.input-12
setp lut5.0.function 0x0d
net spindle-enable lut5.0.in-0
net ext_spindle-at-speed lut5.0.in-1
net spindle-at-speed lut5.0.out

if I use hal meter to view the pins on lut5.0 the inputs have the expected values depending on whether the spindle is on or off and whether it is up to speed or not, but the output is always false.

What am I missing?

The 7I76EU inputs have and ~11K input impedance which needs to be accounted for
when driven by a high impedance source (it looks like your source impedance is around 5K Ohms) 

Hey guys,
I want to measure the internal temp of my jianken ATC spindle. I have a NTC with a classic voltage divider setup, and at room temperature the V_out of this divider carries 12V. (Measured against GND with a multimeter).

However, as soon as I put this cable into analog_in1 of my Mesa 7i76eu, the voltage drops to 8v, and thous the calculated temperature is garbage...

Any ideas why this is happening? 

regards
Sebastian

 

 

7i76EU in Portugal
eusurplus.com/index.php?route=product/pr..._62_71&product_id=50
OR
7i96S with 7i84
eusurplus.com/index.php?route=product/pr...t_id=104&search=7i84
eusurplus.com/index.php?route=product/product&product_id=159
Prices are without tax

7i96S in Germany
www.welectron.com/Mesa-Electronics-7i96S...-Ethernet-Controller
Prices are with tax

Note that the 7I76E/7I76ED have been replaced by the 7I76EU

Dear All,

For my project I'm looking for a Mesa 7I76E card.
Anyone has such card in perfect working condition for sale?

Thanks in advance,

Frans

Hello,

I am running a thre axis CNC mill with stepper motors with mesa 7i76eu. I wanted to connect stepper driver alarm outputs to mesa and have them triger emergency stop. I am also planning on adding two additional Estop buttons. I wired them up but then noticed that linuxCNC setup wizard only lets me select one output as emergency stop. Is there a way I can select multiple inputs as emergency stop, or do I have to wire the buttons in parallel and connect them to one input.

Hey thanks for such a speedy replys i had the orange block wired wrong.

This is using the 7i76e but more or less the same

Do you have power connected to the orange TB1 header? The Jumper W1 connects VIN to VField but you still need to supply power to VField/VIN and GND. My 7i76eu is powered entirely by 24V going to both TB1 Pin 5 / Pin 8 for field voltage and TB3 Pin 21/ Pin 24 for logic power. My PNP sensors work flawlessly although it took me some time to figure out how to set the inputs to sinking/sourcing.

Had the same issue, need to wire the "orange block" so that your inputs and outputs have power. You should see a yellow light only with only Ethernet or 5v power..... and a red or green light with field power.

I think it's just the bottom one on that orange block that needs 24v and the top one needs ground but that's from memory.... please check the manual

Hello,

I am using Mesa 7i76eu card to operate my 3 axis CNC mill. I connected the stepper motors and they work, I can move them with linuxCNC. Now I tried to connect PNP proximity sensors to use as homing switches, but they are not working. At first I was also getting an error when starting linuxCNC, but i noticed that is because W1 jumper fell out while wiring. I set the W1 jumper back to its original left position but the pins are still not working. I also noticed that i have a CR11 LED light turned on indicating field i/o fault. Does anyone have an idea what could be the problem.