Siemens SINAMICS S120 Function Manual page 519

If the reference point (p2599) is in the encoder range, the actual position value is set to the
reference point during adjustment. Otherwise, adjustment is canceled with F07443.
NOTICE
Unplanned movement of the machine when using the encoder outside the defined encoder
range
If a rotary absolute encoder is used outside the defined encoder range, then after switching
off/switching on, undesirable motion can occur. This can damage the machine.
• After adjustment, ensure that the encoder range that has been set up is not exited.
• Activate position tracking (p2720.0) if there is a risk that the encoder range is exited.
Linear absolute value encoder
No overflow occurs with linear absolute encoders, which means that the position can be
restored within the entire traversing range after switch off/on once adjustment has been
carried out. During adjustment, the actual position value is set in line with the reference
point.
Referencing with DRIVE-CLiQ encoders
DRIVE-CLiQ encoders are available as either "multiturn" or "singleturn" absolute encoders. If
the "referencing" function is selected via the PROFIdrive encoder interface and if a DRIVE-
CLiQ encoder or other type of absolute encoder is connected via the DRIVE-CLiQ interface,
the zero point of the singleturn position is used as the reference point.
Further information on commissioning DRIVE-CLiQ encoders is provided in the SINAMICS
S120 Commissioning Manual with STARTER.
Reference point approach for incremental measurement systems
With the reference point approach (in the case of an incremental measuring system), the
drive is moved to its reference point. In so doing, the drive itself controls and monitors the
complete referencing cycle.
Incremental measuring systems require that after the machine has been powered up, the
absolute dimension reference is established to the machine zero point. When powering-up
the actual position value x
point approach, the drive can be reproducibly moved to its reference point. The geometry
with a positive starting direction (p2604 = "0") is shown in the following.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
in the non-referenced state is set to x
0
Function modules
8.8 Basic positioner
= 0. Using the reference
0
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