Preparation for the self-construction of a carousel changer

1kHz is more than can be done on the GPIO with software PWM, which was my first idea.

The 7i76E has a number of expansion ports. What (if anything) do you have plugged in to those? There may be one or more PWM channels available there.

I haven't connected anything to the extension terminations if they mean the two 25 pin connectors.
I only have a 7i84D connected to RS -422.

If you start LinuxCNC from the command line (command "linuxcnc") then there should be a dump of all the pin functions printed to the terminal.
See if you have any extra PWM channels showing.

You can either connect directly to the pins (though it's a bit risky) to get a PWM, or attach any of these boards and take the PWM from them:
store.mesanet.com/index.php?route=product/category&path=83_87
Don't be too concerned about the intended use of the boards, a step-dir output can be used to output PWM if the pin assignments match. But the cheapest board (7i75) is purely buffering/protection and doesn't need a fortuitous match.

Ok then the 7i78 would be the right one for me right?
That is even available at EUSurplas! Then I order the ....
Thanks for the support!

Or 7i75.

Which firmware do you currently have on the 7i76E?

It is the firmware on it as delivered !

I can not look because I am today and tomorrow on vacation.

I have ordered a 7i75!

When starting linuxcnc via the terminal I get the following info:
 

but there is no PWM included ...
Do I have to flash another bit file and if so which one?

I have been poking about in the hostmot2 firmware files for the 7i76E and found a firmware that swaps one of the step-dir channels on the 7i76E for a PWM / DIR channel.
Are you using all the stepgens?
It's the 7i76e_7i76x1p2d.bit file

What is your current "loadrt hm2_eth" line in the HAL file? It might be disabling PWM on the current firmware.

Do you have Mesaflash? (You are likely to need it soon)

sudo apt-get install mesaflash

Yes I am using all 5 stepgens !

My current line is:
loadrt hm2_eth board_ip="10.10.10.10" config=" num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=20xxxx"

I think I need to change num_pwmgens=0   to   num_pwmgens=1   right?

Mesa flash I have already installed ...

Where can I find the new bit file?

Ok I found the bit-fils on the Mesa site!