Siemens Sinumerik 840D sl Programming Manual page 498

Path traversing behavior
8.7 Influencing the motion control
Diagnostics
VELOLIM diagnostics in spindle operation
Active speed limiting using VELOLIM (less than 100 %) can be identified in spindle operation
by reading the system variables $AC_SMAXVELO and $AC_SMAXVELO_INFO.
In the case of limiting, $AC_SMAXVELO supplies the speed limit generated by VELOLIM. In
this case, variable $AC_SMAXVELO_INFO returns the value "16" as identifier for the cause
of the limit VELOLIM.
Examples
Example 1: Velocity limiting, machine axis
Program code
...
N70 VELOLIM[X]=80
...
Example 2: Speed limiting, spindle
Program code
N05 VELOLIM[S1]=90
...
N50 VELOLIM[C]=45
...
Configuring data for spindle 1 (AX5):
MD35130 $MA_GEAR_STEP_MAX_VELO_LIMIT[1,AX5]=1000
MD30455 $MA_MISC_FUNCTION_MASK[AX5] = 64
498
Comment
; The axis slide in the X direction should only be
traversed with a maximum of 80% of the velocity
permissible for the axis.
Comment
; Limiting the maximum speed of spindle 1 to 90% of
1000 rpm.
; Limiting the speed to 45% of 1000 rpm, C is the axis
identifier of S1.
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
; Maximum speed of
gear unit stage 1 =
1000 rpm
; Bit 6 = 1:
Programming
VELOLIM acts
together for spindle
and axis operation
independent of the
programmed
identifier.
Job planning