Description: Multi-turn absolute value encoder
This encoder outputs an absolute angular position between 0° and 360° in the specified
resolution. Furthermore, an internal measuring gearbox enables it to differentiate 4096
rotations. So with a ball screw, for example, the absolute position of the slide can be
determined over a long distance.
Description: Single-turn absolute value encoder
This encoder outputs an absolute angular position between 0° and 360° in the specified
resolution. In contrast to the multi-turn absolute value encoder, it has no measuring gearbox
and can therefore only supply the position value within one revolution. It does not have a
traversing range

以前听西门子的说过，手册上这句话似乎是这个意思