Phillips 432 change constants

Hello

I bought a second hand Maho 500 W4 with 432 controller.
I want to change the planes from G17 to G18 in the coordinate system
However I cannot change the parameter
Open parameter are only displayed after N80 when pressing the F2 key (Oper-NC)

Can anybody help me out?

Regards

Morning

You have to flip a switch (19S1 or 19S2) in the switch cabinet -it should be labelled accordingly. After the edit put it back, the machine will then go into an emergency stop

Holger