Siemens SINUMERIK 840D sl Function Manual page 88

A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
Program code
N520 G0 Z2
N610 G1 Z-4
N620 G1 X0 Y-20
Optimized release of the axis clamping via travel command
If a clamped axis is to be traversed in continuous-path mode, a travel command is issued for
the clamped axis in the rapid traverse blocks (G0) immediately before the traversing block of
the clamped axis. This way, the PLC user program can release the axis clamp again in time.
Note
The travel command is set to a maximum of two rapid traverse blocks prior (including
intermediate blocks) to retain the reference to the initiating part program block.
Parameterization:
MD36052 $MA_STOP_ON_CLAMPING = 'H03' (special function for clamped axis)
Requirements for the PLC user program
● The axis is removed from the clamp as soon as a travel command is pending.
● The axis may be removed from the clamping even when only positioning is being performed
(G0).
The following figure shows an example of the interface signals and states upon releasing of
the axis clamp:
88
Comment
; Machining
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions