Homing with detached 4th axis

Hi,

I wonder if there is a neat way to home refrence all with the 4th axis disconnected?
My machine has a 4th axis but there might be situations where I would like to have the space on the table and remove it.
So far I was thinking about using simply two configurations, but I wonder if I can do it with one.
I have signals showing me if the axis is connected. I wonder if I can use this to override homing the Axis

Thanks Patrick
 

Not sure if this is helpful , but here's my 4th scheme:

My 4th is set up with manual homing for a few reasons.  First, I may have a fixture or trunnion table attached and I don't want to blindly let it rotate without checking clearances.

Second, my particular setup uses the servo drive's internal home-to-switch, back-to-index feature. (LCNC is running open-loop).

Third - and this is probably the most important reason - I had no clue how to modify/create a custom-homing routine which automatically detected the 4th axis and homed it (or not) depending on whether it was connected.

When I command the 'home 4th' function, LCNC immediately zeros the DRO, the drive does it's homing routine, and then signals LCNC the drive 'is-homed'.  In the case of a power off, estop, or drive disable LCNC is set up to unhome all axes.

Like you, I have a 'connected' signal (using the servo cable) that controls both the drive contactor as well as informing LCNC that the 4th axis is attached/detached.