Siemens SINUMERIK 840C Installation Instructions Manual page 858

09.01
Lin. incremental measuring step =
The position controller resolution is coarser than the linear incremental measuring step and
therefore determines the positioning accuracy. If the incremental measuring step were coarser
than the position controller resolution, the incremental measuring step would determine the
position controller resolution.
Rotary EnDat measuring step =
EnDat measuring step =
Linear grid spacing
NC-MD 1264* =
Lin. EnDat measuring step
Example LC 181:
Grid spacing, finest track
EnDat measuring step
Internal pulse multiplication
External pulse multiplication (interpolation)
Position controller resolution
Lin. incremental measuring step =
Lin. grid spacing
NC MD 1264* =
Lin. EnDat measuring step
Calculation of the grid spacing with EnDat absolute encoders using 611D:
Meas. system 1: 1264*=
Meas. system 2: 1264*=
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
12.11.2 ENDAT absolute encoder (SW 5.2 and higher)
Linear grid spacing 10 mm
=
Pulse multiplication 2048
1 revolution
= 1.22 * 10
2048 * 4
10 mm
µ
= 1.22 m
2048 * 4
2048 * 4
10 mm
= *
2048 * 10 mm
16 µm
0.1 µm
4
512
0.5 µm = 0.5 * 10
Lin. grid spacing
=
Pulse multiplication
µ
16 m
=
µ
0.1 m
Drive MD 1022
Drive MD 1005
Drive MD 1032
Drive MD 1007
6FC5197- AA50
12 Functional Descriptions
1
* = 0.002384
4 * 512
-4
rev.
= 4
-3
mm
µ
16 m
µ
= 0.0078125 m
4 * 512
= 160
µ
m
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