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I tried to do it correctly so I wired them as normally closed. I have 2 limit switches on the axis and this one is also my home switch. 
If I follow your advice then I need to revert everything to have the other LS as HS. This is not an issue to be honest, just thinking about the consequences. 

Thank you Peter.  I reviewed the link you provided, but is there a document or manual which describes how to set this up?

That indicates a Ethernet latency issue.

What does the command

sudo chrt 99 ping -i .001 -q -c 60000 192.168.1.121

report?

(the command will run for one minute then print statistics)
 

When I move the engines after a while, I get this error. 

I can't figure out what the problem is. The connection seems to be fine.

I installed both versions 2.9.5 and 2.9.6 and both have the same problem with the parallel port. I have an MPG configured with a C10 and in version 2.9.4 it works perfectly, but in either of these last two versions it doesn't. When running LCN you can see with the hal that the parallel port is indeed loaded on the pins, but none of the functions programmed in the MPG work. I went back to 2.9.4 and the MPG works again.

Thanks to each for reply's...Going to get back to that in a day or so so will likely struggle a bit...but that is the way it works!

LinuxCNC can do all that, and much more, but it is much better to use a micro controller for that task, usually PLC, but you can make your own PLC just search for "arduino PLC" or "ESP32 PLC" .

@LangdonS,
what are you replying to ?
And might i add: why?
Edit,
OK i found it.

There's an example of an electronic gearbox for a lathe, no gcode, just a custom GUI and some HAL connections.

Probably not a lot that you can use, but an example of what you can do.

My guess would be as long as you can get the data into linuxcnc and output any control values based on the input you should be fine. This would probably require some custom HAL written components to operate on the data and apply the output required. Oh yeah and maybe a gui.

The absolute simplest example I can think of is the parallel port tester, doesn't have any kinematics, but does allow you to control outputs and read the state of inputs.

Just throwing this out there.
MRO is another example. Maybe this could be a starting point, just start be reading data and displaying it, once you have that nailed, you could start with some simple HAL components to manipulate your data.
linuxcnc.org/docs/html/gui/mdro.html

Not an exact implementation but kind a simple example of what is achievable.

No doubt Andy will have a better idea and contradict everything Ive said, as he's way way more knowledgeable.

2.9.4 and Wheezy now accessible via:
www3.langdonstaab.ca/LinuxCNC/
www3.langdonstaab.ca/LinuxCNC/iso/
and
www3.langdonstaab.ca/iso/

Random Ubuntu Server question:
Why does the du command show the symbolic link (created via ln) as occupying space and not the actual file?
Really strange.

I deleted all other files.

(And fixed the directory structure!)

Now it's just wheezy and 2.9.4.

As long as the axis is only controlled by gcode (with no direct display/control from the GUI)
it should work.

You will have to do some hand editing of the hal file to add
the additional joints/axis and kinematics specifier.

Here is a suggestion:

forum.linuxcnc.org/plasmac/55286-servo-d...ofit?start=10#331245


( pncconf has more built-in QTPlasmaC/THCAD support  so may be an easier path)

If I hadn't already occupied all 5 axes I wouldn't have a problem.
Is it possible that my 7i85s card can't control any motors? Does this only work with the 7i85 (without S)? I can't find a clear answer online. Thanks.

Are your switches wired as normally open or normally closed?

For a normally open switch, you can just disconnect it.

For a normally open switch, just somehow short the connection so it never trips.

Though that could be pretty dangerous.

Disable a limit switch at your own risk!