Siemens SINUMERIK 840D sl Function Manual page 776

Punching and Nibbling (N4)
Protection zones
10.6 Protection zones
Clamping protection zone
The "clamping protection zone" function is contained as a subset in the "Protection zones"
function. Its purpose is to simply monitor whether clamps and tool could represent a mutual
risk.
Note
No by-pass strategies are implemented for cases where the clamp protection is violated.
References:
/FB1/ Function Manual, Basic Functions; Axis Monitoring, Protection Zones (A3)
10.7 Supplementary conditions
Availability of function "Punching and nibbling"
The function is an option and is available for:
● SINUMERIK 840D with NCU 572 and 573
776
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions