Siemens SINUMERIK 840Di Function Manual page 376

Detailed Description
2.1 Velocities, traversing ranges, accuracies
For setting the interpolation cycle, see:
References:
/FB3/Description of Functions, Special Functions; Cycle Times (G3)
With a high feedrate (resulting from programmed feedrates and feedrate override), the
maximum path velocity is limited to V
This automatic feedrate limiting can lead to a drop in velocity over several blocks with
programs generated by CAD systems with extremely short blocks.
Example:
Interpolation cycle = 12 ms
N10 G0 X0 Y0; [mm]
N20 G0 X100 Y100; [mm]
⇒ Path length programmed in block = 141.42 mm
⇒ V
The following restriction applies to the minimum path or axis velocity:
The computational resolution is defined via machine data:
MD10200 $MN_INT_INCR_PER_MM (computational resolution for linear positions)
or
MD10210 $MN_INT_INCR_PER_DEG
(computational resolution for angular positions):
If V
2-2
= (141.42 mm/12 ms)
max
is not reached, no traversing is carried out.
min
.
max
0.9 = 10606.6 mm/s = 636.39 m/min
*
Velocities, Setpoint/Actual-Value Systems, Closed-Loop Control (G2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0