Efficient Networks Siemens Sinamics S120 - Manual (Page 210)

Basic functions
6.14 Position tracking
Drive Functions
210
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Figure 6-13 Odd-numbered gears with position tracking (p0412 = 8)
Measuring gearbox configuration (p0411)
The following points can be set by configuring this parameter:
● p0411.0: Activation of position tracking
● p0411.1: Setting the axis type (linear axis or rotary axis)
Here, a rotary axis refers to a modulo axis (modulo offset can be activated through
higher-level control or EPOS). With a linear axis, position tracking is mainly used to
extend the position area (see section: Virtual multiturn encoder (p0412)).
● p0411.2: Reset position
Overflows can be reset with this. This is required, for example, the encoder is turned by
more than 1/2 the encoder range while switched off.
Virtual multiturn encoder (p0412)
With a rotary absolute encoder (p0404.1 = 1) with activated position tracking (p0411.0 = 1),
p0412 can be used to enter a virtual multiturn resolution. This enables you to generate a
virtual multiturn encoder value (r0483) from a singleturn encoder. It must be possible to
display the virtual encoder range via r0483.
NOTICE
If the gear factor is not equal to 1, then p0412 always refers to the motor side. The virtual
resolution, which is required for the motor, is then used here.
For rotary axes with modulo offset, the virtual multiturn resolution (p0412) is preset as p0421
and can be changed.
For linear axes, the virtual multiturn resolution (p0412) is preset as p0421 and extended by 6
bits for multiturn information (max. overflows 31 positive/negative)
If, as a result of extension of the multiturn information, the displayable area of r0483 (2
32 bit)
is exceeded, the fine resolution (p0419) must be reduced accordingly.