Siemens Sinamics S120 Function Manual page 366

Function modules
7.8 Basic positioner
Referencing with DRIVE-CLiQ encoders
DRIVE-CLiQ encoders are available as either a "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.
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 position actual 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.
Figure 7-17
The signal on binector input p2595 (start referencing) is used to trigger travel to the
reference cam (p2607 = 1) if search for reference is selected at the same time (0 signal at
binector input p2597 (referencing type selection). The signal in binector input p2595 (start
referencing) must be set during the entire referencing process otherwise the process is
aborted. Once started, the status signal r2684.11 (reference point set) is reset.
The software limit switch monitoring is inactive during the complete reference point
approach; only the maximum traversing range is checked. The SW limit switch monitoring is,
if required, re-activated after completion.
364
in the non-referenced state is set to x
0
Example: reference point approach with reference cam
= 0. Using the reference
0
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions