Siemens SINAMICS S120 Function Manual page 273

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Example of position area extension

With absolute encoders without position tracking, it must be ensured that the traversing

range is 0 smaller than half the encoder range, because beyond this range, no unique

reference remains after switching on and off (see description on parameter p2507). This

traversing range can be extended using the virtual multiturn (p2721).

The following diagram illustrates an absolute encoder that can represent 8 encoder

revolutions (p421 = 8).

In this example, this means:

Without position tracking, the position for +/- 4 encoder revolutions about r2521 = 0 LU can

be reproduced.

With position tracking, the position for +/- 12 encoder revolutions (+/- 12 load revolutions with

load gear) can be reproduced (p2721 = 24).

Practical example:

For a linear axis, the value for p2721 is set to 262144 for an encoder with p0421 = 4096.

That means, +/- 131072 encoder revolutions or load revolutions can be reproduced in this

For a rotary axis, a value for p2721 = p0421 is set for an encoder.

Drive functions

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

Position tracking (p2721 = 24), setting p2504 = p2505 =1 (gear factor = 1)

Function modules

7.8 Closed-loop position control