Siemens SINAMICS S120 Commissioning Manual page 181

Together with a resolution of 11-bit (= 2048) encoder pulses per revolution this gives a 22-bit
resolution.
Figure 4-62
Fine resolution for TTL/HTL encoders
TTL/HTL pulse encoders operate with digital signals whose fine resolution is less-precise
than that for incremental encoders. The digital signals permit only a fine resolution of 2 bits =
4, because only the signal edges can be counted here.
Figure 4-63
Multiturn resolution XIST_2 (p0421)
For multiturn encoders, the number of resolvable revolutions is displayed and set via the
resolution. With the number of revolutions, you also specify the measuring range (for
example, the travel path for a spindle). Typical values are, for example, 9 bits = 512
revolutions or 12 bits = 4096 revolutions.
The value of p0421 acts on p0483 (actual position value) and is required once only when the
encoder position (absolute position) is read at start-up.
Commissioning with Startdrive
Commissioning Manual, 12/2018, 6SL3097-5AA10-0BP0
Incremental encoders
TTL/HTL encoders
4.8 Basic parameterization of the drive objects
Commissioning
179