The hookup schematic "S14954-ACORN_rev4_LIMITALL_HOMEALL" shows all the limit switches wired in series.
How does that work?
Does it only home one axis at a time?
How does it know which axis is tripping the switch?
If one is tripping the switch, how will it tell if the other axis reach their switch?
Confused.exe
if all limit switches are wired in series, how does it know which is which?
Moderator: cnckeith
-
- Posts: 3072
- Joined: Tue Mar 22, 2016 10:03 am
- Acorn CNC Controller: Yes
- Allin1DC CNC Controller: Yes
- Oak CNC controller: Yes
- CNC Control System Serial Number: 100505
100327
102696
103432
7804732B977B-0624192192 - DC3IOB: No
- CNC12: Yes
- CNC11: No
- CPU10 or CPU7: No
- Location: Boston, MA
- Contact:
Re: if all limit switches are wired in series, how does it know which is which?
Use the search box in the upper right to search on "homeall". Many posts explaining how it works.
Cheers,
Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
-
- Posts: 485
- Joined: Sat Aug 11, 2018 11:22 pm
- Acorn CNC Controller: Yes
- Plasma CNC Controller: No
- AcornSix CNC Controller: No
- Allin1DC CNC Controller: Yes
- Hickory CNC Controller: No
- Oak CNC controller: No
- CNC Control System Serial Number: none
- DC3IOB: No
- CNC12: Yes
- CNC11: No
- CPU10 or CPU7: No
- Location: Oregon
Re: if all limit switches are wired in series, how does it know which is which?
In the wizard you can set the order of axes to home e.g.Z (3) first, then Y (2) then X(1) would be typical for a mill. You also set direction but based on your question if you place a limit switch on the X axis, because they're in series it shouldn't matter where in the series it's wired - when tripped it opens and breaks the path. Just check to make sure all the switches open and close.
HTH
HTH
My Tree J325 & Projectshttps://photos.app.goo.gl/LLHf8M84eQYwP3ph6
MAKING PARTS https://www.youtube.com/shorts/MSQ4TyTzFkk
Hardinge CHNC4 Retrofithttps://photos.app.goo.gl/244YnF9ykyUf7mfq7
MAKING PARTS https://www.youtube.com/shorts/MSQ4TyTzFkk
Hardinge CHNC4 Retrofithttps://photos.app.goo.gl/244YnF9ykyUf7mfq7
Re: if all limit switches are wired in series, how does it know which is which?
A key point to understand is that home is just clear of the switch, not on the switch.
Since each axis moves clear of the switch after tripping it, and only one axis homes at a time, the code can assume that the axis that is in motion is the one that tripped its switch.
That is why you cannot start homing if a switch is already tripped. You have to jog clear first.
Since each axis moves clear of the switch after tripping it, and only one axis homes at a time, the code can assume that the axis that is in motion is the one that tripped its switch.
That is why you cannot start homing if a switch is already tripped. You have to jog clear first.