Siemens Sinamics S110 Function Manual page 233

Reference point approach for incremental measurement systems
When 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 7-51
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.
The velocity override set is only effective during the search for the reference cam (step 1).
This ensures that the "cam end" and "zero mark" positions are always overrun at the same
speed. If signal propagation delays arise during switching processes, this ensures that the
offset caused during establishment of position is the same in each referencing process.
Axes that only have one zero mark over their complete traversing or modulo range are
designated with parameter p2607 = 0 (no reference cam present). After starting the
referencing process, synchronization to the reference zero marks is started straight away
(see step 2) for these axes.
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
in the non-referenced state is set to x
0
Example: reference point approach with reference cam
Drive functions
7.3 Function modules
= 0. Using the reference
0
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