I will put my hand up and say that I am embarrassed to be asking this, but....
With my machine, the Y axis is driven by two motors which are 180 degrees from each other. I have slaved the A axis off the Y axis, with the A direction reversed. Everything works well but I am making a change to the machine that requires the slaved axis to not be reversed. But when I looked at motor configuration, I noticed that the settings for A are significantly different to Y settings. I have not noticed this before and had not to as all was well.
So my question is: if an axis is slaved, does it automatically use the settings from the axis that it is slaved from?