Constraints - Siemens SINUMERIK 840D sl Function Manual

The two CPRECON and CPRECOF modal G functions form the G function group 39
(programmable contour accuracy).
Behavior for part program start and after reset / part program end
For part program start and after reset / part program end, the configured control initial setting
acts for the G function group 39:
MD20110 $MC_RESET_MODE_MASK (definition of initial control settings after RESET / TP
End)
MD20112 $MC_START_MODE_MASK (definition of the basic setting of the control after part
program start)
Supplementary conditions
Positioning axes
The function considers only the geometry axes of the path. It does not have any effect of the
velocities for the positioning axes.
References
Information about MD32402 $MA_AX_JERK_MODE (filter type for axial jerk limitation) and
MD32410 $MA_AX_JERK_TIME (time constant for the axial jerk filter), see:
Function Manual, Basic Functions; Acceleration (B2), Section: "Functions" > "Jerk filter (axis-
specific)"
Information about CTOL, see:
Function Manual, Basic Functions; Continuous-Path Mode, Exact Stop, Look Ahead (B1),
Section: "Contour/orientation tolerance"
4.4

Constraints

Availability of the "Contour tunnel monitoring" function
The function is an option ("Contour monitoring with tunnel function"), which must be assigned
to the hardware via the license management.
Coupled motion
If coupled motion between two geometry axes is programmed with contour tunnel monitoring,
this always results in activation of the contour tunnel monitoring. In this case, the contour tunnel
monitoring must be switched off before programming the coupled motion:
MD21050 $MC_CONTOUR_TUNNEL_TOL = 0.0
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
K6: Contour tunnel monitoring
4.4 Constraints
183