Siemens sinumerik 840D sl Operating Manual page 402

Programming technology functions (cycles)
8.5 Contour milling
Parameters Description
Machining Face C

surface
Face Y

(only for
Face B

ShopTurn)
Peripheral surface C

Peripheral surface Y

Machining The following machining technologies can be selected:
∇ (roughing)

∇∇∇ base (base finishing)

∇∇∇ edge (edge finishing)

Chamfering

Reference point Z or X
Z0 or - (only for G code and ShopTurn, machining surface, face C/Y/B) or
X0 - (only for ShopTurn, machining surface, peripheral surface C/Y)
Pocket depth (abs) or depth referred to Z0 or X0 (inc)
Z1 or - (only for G code and ShopTurn, machining surface, face C/Y/B) or
X1 - (only for ShopTurn, machining surface, peripheral surface C/Y)
CP Positioning angle for machining area
- (only for ShopTurn, machining surface, face Y)
C0 Positioning angle for machining surface
- (only for ShopTurn, machining surface, peripheral surface Y)
Maximum plane infeed

Maximum plane infeed as a percentage of the milling cutter diameter

DXY or
- (only for G code and ShopTurn, machining surface, face C/Y/B) or
DYZ
- (only for ShopTurn, machining surface, peripheral surface C/Y)
Maximum depth infeed
DZ or - (only for G code and ShopTurn, machining surface, face C/Y/B) or
DX - (only for ShopTurn, machining surface, peripheral surface C/Y)
Finishing allowance plane
UXY or - (only for G code and ShopTurn, machining surface, face C/Y/B) or
UYZ - (only for ShopTurn, machining surface, peripheral surface C/Y)
Finishing allowance depth
UZ or - (only for G code and ShopTurn, machining surface, face C/Y/B) or
UX - (only for ShopTurn, machining surface, peripheral surface C/Y)
Manual
Starting point 
Starting point is entered
Automatic

Starting point is automatically calculated
XS Starting point X - (only for "manual" starting point)
YS Starting point X - (only for "manual" starting point)
402
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Unit
mm
mm
Degrees
Degrees
mm
%
mm
mm
Turning