Siemens SINUMERIK 840D sl Function Manual page 89

Figure 3-3
Automatic stop to set the clamping
If an axis is to be clamped in continuous-path mode, the NC stops the path motion before the
next "Non-rapid traverse block" if the axis has not been clamped by then, i.e. the PLC has set
the feedrate override value to zero.
Parameterization:
MD36052 $MA_STOP_ON_CLAMPING = 'H04' (special function for clamped axis)
Requirements for the PLC user program
● The axis is always clamped when no travel command is pending.
● The axis does not have to be clamped during positioning of the other axes.
It can be seen whether the axes are being positioned depending on whether rapid traverse
(G0) is programmed.
The stop command is therefore not set immediately at the beginning of the block containing
the axis, but rather at the beginning of the next machining block (traversing block that is
not traversed with rapid traverse).
● The axis is clamped if the feedrate override of a machining block is not equal to 0.
If the axis is clamped before the next machining block, i.e. the feedrate override is other
than 0 again, no stop is generated.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Release axis clamp if MD36052 $MA_STOP_ON_CLAMPING = 'H03'
A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
89