Siemens sinumerik 840D sl Operating Manual page 264

Programming technology functions (cycles)
8.1 Drilling
Parameters Description
Z0 (only for G Reference point Z
code)
Machining - (with You can select the following technologies for tapping:
compensating
with encoder

chuck)
Tapping with spindle encoder
without encoder

(only for G code)
Tapping without spindle encoder;
–
SR (only for Spindle speed for retraction - (only for spindle speed "S")
ShopTurn)
VR (only for Constant cutting rate for retraction - (only for constant cutting rate "V")
ShopTurn)
Face C
Machining 
surface
Face Y

(only for
Peripheral surface C

ShopTurn)
Peripheral surface Y

Please note that when machining in the face C and peripheral surface C planes,
clamping only remains active for the drilling operation. On the other hand, when
machining in the face Y and peripheral surface Y planes, clamping is modal, i.e. it
remains active until the machining plane is changed.
Z1 End point of the thread (abs) or thread length (inc) - only for G code and "ShopTurn
machining surface face")
It is inserted into the workpiece until it reaches Z1.
X1 End point of the thread (abs) or thread length (inc) - (only for machining surface,
(only for peripheral)
ShopTurn)
It is inserted into the workpiece until X1 is reached.
User input
Pitch - (only 
machining without
Pitch is obtained from the input
encoder)
Active feedrate

Pitch is obtained from the feedrate
(only for G code)
Table Thread table selection:
without

ISO metric

Whitworth BSW

Whitworth BSP

UNC

Selection Selection, table value: e.g.
M3; M10; etc. (ISO metric)

W3/4"; etc. (Whitworth BSW)

G3/4"; etc. (Whitworth BSP)

1" - 8 UNC; etc. (UNC)

264
Define "Pitch" parameter
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Unit
mm
rev/min
m/min
mm
mm
Turning