Siemens SINUMERIK 840Di sl - Traversing Ranges; Positioning Accuracy of the Control System

NC Commissioning with HMI Advanced
11.3 System data
Manual
374 Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
11.3.6 Traversing ranges
Computational resolution and traversing ranges
The range of values of the traversing ranges directly depends on the selected computational
resolution (see Subsection
"Resolutions" (Page 365)).
For the default value assignment of the machine data for the computational resolution 1000
Incr./mm or 1000 Incr./deg. there are the following traversing ranges:
Table 11-9 Traversing ranges
Traversing range in the metric
system
Traversing range in the inch
system
Linear axes ± 999,999.999 [mm; deg.] ± 399,999.999 [inch; deg.]
Rotary axes ± 999,999.999 [mm; deg.] ± 999,999.999 [inch; deg.]
Interpolation parameters I, J, K ± 999,999.999 [mm; deg.] ± 399,999.999 [inch; deg.]
11.3.7 Positioning accuracy of the control system
Computational resolution and traversing ranges
The positioning accuracy depends on:
● the computational accuracy (internal increments/(mm or degrees))
● the actual-value resolution (encoder increments/(mm or degrees)).
The rougher resolution of both values determines the positioning accuracy of the NC.
The input resolution, the position control and interpolation clock do not affect the accuracy.
Machine data
Table 11-10 Positioning accuracy: Machine data
Number Name Name/remarks
General ($MN_ ... )
10200 INT_INCR_PER_MM Computational resolution for linear positions
10210 INT_INCR_PER_DEG Computational resolution for angular positions
Axisspecific ($MA_ ... )
31020 ENC_RESOL[n] Encoder pulses per revolution