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No, the actual index pin is not typically used by LinuxCNC

What interface card are you using for the encoder interface?

Is the encoder single ended or differential?

Is  the interface card jumpered to match the encoder type?

Another way to check the low level hardware is to set the index input to
single ended mode, and then watch hm2_7i80.0.encoder.00.input-index
in halshow as you ground the index input on the interface card.
hm2_7i80.0.encoder.00.input-index  should change state when you ground
the +index input pin

(with the encoder unplugged of course)

 

FF0,FF1,FF2 are feed forward terms

FF0 adds a proportion of the PID command to the PID output
FF1 adds a proportion of the PID commands first derivative to the PID output
FF2 adds a proportion of the PID commands second derivative to the PID output

For a simple example imagine a spindle control PID loop
This would have a PID loop with velocity command and velocity output.
Setting FF0 to 1 means that at a say commanded RPM of 3000,  means
that the PID output would be 3000 without any correction from the PID error
term. You can think of the FF terms as a way of centering the operating
point of the PID loop around the current state (rather than having
feedback have to do all the heavy lifting)

 

No, it does not.
I scrolled through the HAl and could not find the hm2_7i80.0.encoder.00.input-index pin linked anywhere. So I assume Linuxcnc does not get this signal- can this be the reason?

If you set x-index-enable high manually, does it get cleared if you jog the axis? 
(enough for one full turn of the encoder)

Beware, this may trigger a following error

Works for me. I use the same potentiometer for jog and feed rate (changes are immediate during jogging and running commands):

I can set it high in HAL-show by pressing the SET button on the right side, but not by homing/tripping the switch.
Also with 1ms division I can not see the index rush by...

I was previously continually jogging by holding down the + or - buttons in Probe Basic. However now it only moves one step at a time. I’ve obviously made a change somewhere but don’t know where to look. 

Any ideas?

Thank you for your answer
I can change the speed with a potentiometer, but if I change it while the axes are moving, it doesn't take effect. I have to stop the axes, change the speed, and then move the axes again. What I want is to be able to change the speed while the axes are moving.

I'm going to run some tests this weekend.
To be honest, I'm having trouble understanding the purpose of the FF0, FF1, and FF2 terms. Are these offsets of the PID terms?

Are you saying you cannot set x-index-enable true in halshow?

hm2_7i80.0.encoder.00.input-index pin staying true may be OK as this just reflects its
polarity, and you are unlikely to catch the actual index with halscope because of its narrow width
(especially at 500 ms/division where halscope throws away most samples)

Unless you can set x-index-enable it will be difficult to diagnose


 

No, something is wrong.
the  hm2_7i80.0.encoder.00.input-index pin permanently stays true and
the  x-index-enable signal permanently stays false. The pictures show the state they are in and also when moving the axis by G1 F10 X 0 to 10 and back nothing changes
And the index-enable does not go high when the home switch trips (when homing)
 

 

There are pins to change jog speed using counts (eg for encoder) and for using analog value (eg for potentiometer):
linuxcnc.org/docs/html/gui/gmoccapy.html...cities_and_overrides

I'm trying to execute an M100 from this toolchange subroutine, whithout M100 works. Here is the M100 and it works in MDI, what can cause the hang? 

#!/bin/bash
# M100 Orient Spindle (Homing function)
halcmd sets s-index-zero-for-ATC true
exit 0

 
 

Thank you Andy, but I can not gain access to the X-Motor or spindle- probably to the Z spindle and move the Z-axis, I will try. So jogging the X-axis slowly must do the job.
Sigi

Alex, try
nn being the number you want to set. There is also an upload. Sometimes it is better to do it outside of linuxcnc.
Check for SDO index:subindex using $ "ethercat -p 2 sdos"

Max, did you try to claim it with "AliExpress Seller Protection"?

Philip, the manual says it can be done see snippet here
 
You should be able to add PDO 0x60ff to the SyncManager listing in the config, I think.
0x60ff is also in rxpdo 1703,1704,1705 so one of them should work. I guess.