Siemens SINUMERIK 840C - Manual (Page 858)

09.01 12 Functional Descriptions
12.11.2 ENDAT absolute encoder (SW 5.2 and higher)
Lin. incremental measuring step = = * = 0.002384 µ m
Linear grid spacing
Pulse multiplication
10 mm
2048
1
4 * 512
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 = = 1.22 * 10 -4 rev.
1 revolution
2048 * 4
EnDat measuring step = = 1.22 µ m
2048 * 4
10 mm
NC-MD 1264* = = * = 4
Linear grid spacing
Lin. EnDat measuring step 2048 * 10 mm
2048 * 4 10 mm
Example LC 181:
Grid spacing, finest track 16 µ m
EnDat measuring step 0.1 µ m
Internal pulse multiplication 4
External pulse multiplication (interpolation) 512
Position controller resolution 0.5 µ m = 0.5 * 10 -3 mm
Lin. incremental measuring step = = = 0.0078125 µ m
Lin. grid spacing
Pulse multiplication
16 µ m
4 * 512
NC MD 1264* = = = 160
Lin. grid spacing
Lin. EnDat measuring step 0.1 µ m
16 µ m
Calculation of the grid spacing with EnDat absolute encoders using 611D:
Meas. system 1: 1264*=
Drive MD 1022
Drive MD 1005
Meas. system 2: 1264*=
Drive MD 1032
Drive MD 1007
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SINUMERIK 840C (IA)