Siemens SINUMERIK 840D sl Function Manual page 82

Detailed description
2.1 Axis monitoring
Optimized releasing of the axis clamp 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.
(The travel command is set a maximum of two rapid travers 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)
Prerequisites 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 clamp even if only during positioning (G0).
The following image shows an example of the interface signals and states upon releasing of
the axis clamp:
Figure 2-3
16
Release axis clamp if MD36052 $MA_STOP_ON_CLAMPING = 'H03'
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0