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Note that the 7I76E/7I76ED have been replaced by the 7I76EU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

Success!
I moved that line to my posthui.hal and now everything works. 

# --- ESTOP-EXT ---
net pendant-estop     <= hm2_7i76e.0.7i76.0.0.input-29

Thx for the support. 

Its not easy to add a 3rd MPG to a 7I76E/7I76EU isolated I/O
But it would be easy to add 3 or 4 to the parallel expansion port
of a 7I76E,7I76EU,7I96,7I96S,7I95,7I95T etc as long as the MPG
just has 5V signals

Another easy way to add 4 MPG inputs to almost any card and simplify cabling
is to add a 7I73

 

I have never run this sort of mill- it originally had 3 handwheels, one for each axis, i dont know the resolution of them, but i doubt they were 100ppr, im thinking more like 200-500 to do half thou or 2 tenth motion(assuming 1 rotation was .1"), at least thats what would make sense for me.

i have another question: can a 3rd mpg encoder be added to the firmware of a 7i76e?

Also thanks a lot for the help, and this forum. amazing place!

Update / Wednesday 5:52PM: 
finally found the root cause for this behavior.
Its line 25 in my pendant.hal

# --- ESTOP-EXT ---
net pendant-estop     <=  hm2_7i76e.0.7i76.0.0.input-29

when I comment it out, everything is fine. 

Now I just have to understand whats going on with this signal.

Regards
Sebastian

###############################

OK, I am one step closer.. I created a "virgin" configuration.. that worked fine and didnt show this error. Than I started copying my old config file by file into the new folder to narrow down when this error would be introduced.

And - believe it or not - it happens as soon as I include my pendant.hal file.

Here is a screencast. Its 100% reproducable.


As soon as "G54" is highlighted in the top left corner, everything is fine. When its "off", I always get this popup...

Does this make any sense to you?
this is my config.
github.com/SebastianMusser/LinuxCNC