If you swap the armature leads you also would have to swap the tach.
Then what about your readout direction?
What CNC control is this? As generally you connect the servo up to the book, and if you need another servo direction or readout reversal, this can be done normally by parameter.
If you need to reverse the direction of an encoder, you only need to swap A & /A.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.