01/2007
11.5 Axes and spindles
11-323
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
The diagrams below show the general possibilities of arranging a rotary incre-
mental measuring system with regard to motor and load, as well as the resulting
values for the respective machine data.
M
IS_ROT_AX=0
Ball screw
Load gearbox
Table
Linear scale
ENC_IS_LINEAR=1
ENC_IS_DIRECT=1
ENC_GRID_POINT_DIST
ENC_FEEDBACK_POL= [1 or –1]
DRIVE_AX_RATIO_NUMERA
DRIVE_AX_RATIO_DENOM
LEADSCREW_PITCH
spindle revs
motor revs
=
Fig. 11-9 Linear axis with linear scale
Table 11-21 Linear measuring systems: Machine data
Number
Identifier Name/remarks Refer-
ence
Axis–specific ($MA_ ... )
30240 ENC_TYPE[n] Actual–value acquisition modes
1 = incremental signal generator
30242 ENC_IS_INDEPENDENT[n] Encoder is independent
30300 IS_ROT_AX Rotary axis R2
31000 ENC_IS_LINEAR[n] Direct measuring system (linear scale)
31010 ENC_GRID_POINT_DIST[n] Distance between reference marks on linear
scales
31030 LEADSCREW_PITCH Leadscrew pitch
31040 ENC_IS_DIRECT[n] Encoder is connected directly to the machine
31050 DRIVE_AX_RATIO_DENOM[n] Denominator load gearbox
31060 DRIVE_AX_RATIO_NUMERA[n] Numerator load gearbox
32110 ENC_FEEDBACK_POL[n] Sign actual value (feedback polarity)
Linear measuring
system
Linear axis with
linear scale
Machine data
11 NCK Commissionin
with HMI Advanced
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