AcornSix - Zri Homing with linear scales

[tblough]

Those variables will only change when the encoder is sitting on the index mark. You will need to check the variable when the asterisk is showing on the PID screen.

[RC-Lights]

Hi Tom,

Is that really true? the lathe Operation manual says, that These variable will contain the number of counts of the last index pulse.

Michael

[RC-Lights]

no idea ?

i saw, that in the latest manual for PLC programming these variables are not listet. Are they kind of new and is there maybe a bug ?

Michael

[cncsnw]

Tom was probably thinking you meant #23401-#23408.

Just out of curiosity, do #23401 and #23402 change state on your system, corresponding to whether or not the asterisk is showing?

Yes, I think #25101-#25108 are relatively new. Presumably they were added to avoid the awkward timing issues you get when you try to use #23401-#23408. Perhaps the new variables have not been fully implemented on Acorn.

[tblough]

Just one point I'm sure you are aware of. The X-axis will not have an index pulse. The index pulse will be on whatever axis the SCALE is attached to.

[RC-Lights]

Tom was probably thinking you meant #23401-#23408.

Just out of curiosity, do #23401 and #23402 change state on your system, corresponding to whether or not the asterisk is showing?

Yes, I think #25101-#25108 are relatively new. Presumably they were added to avoid the awkward timing issues you get when you try to use #23401-#23408. Perhaps the new variables have not been fully implemented on Acorn.

Yes, probably He means #23401-#23408

I have to Check, if These variable changes, good idea. But from my understanding it World be really difficult to built a precise Homing macro with it.

Just one point I'm sure you are aware of. The X-axis will not have an index pulse. The index pulse will be on whatever axis the SCALE is attached to.

Of course i have scales on Z and X Axis and they are configured in the Wizard and the closed loop System works well. To avoid a mistake i checked All of the variables from 25101 - 25108 and they are all -1.

[RC-Lights]

hi all, i want do give a small update:

the ZRI Homing process is working now ! very happy about it.

but i need to use a workaround. since the RS422 Signal cannot switch an Input and the variable in Acorn is not written from the INdex pulse, i use an little Optocoupler transistor from 5V to 24V to switch an Input on and off when reaching the Index Pulse.


this is working great and i wrote a homing makro and everything is fine now. thank you for your support.

[killacam]

hi all, i want do give a small update:

the ZRI Homing process is working now ! very happy about it.

but i need to use a workaround. since the RS422 Signal cannot switch an Input and the variable in Acorn is not written from the INdex pulse, i use an little Optocoupler transistor from 5V to 24V to switch an Input on and off when reaching the Index Pulse.


this is working great and i wrote a homing makro and everything is fine now. thank you for your support.

Thanks or posting this & the amazon link - I am going down a similar path but with a closed loop stepper motor that has a 3 pole encoder without a drive that supports Zri homing signals - I am looking at the CNC4PC C87 Encoder Index Homing Board to help integrate the Z signal - not sure if you looked at that option or if that board will do what i think it will do

[cnckeith]

thanks for reporting back

[RC-Lights]

https://youtube.com/shorts/wuulF71HwA4? ... 6oRPEjjFni

Here a short Video how accurate the Homing process is now