Siemens Sinamics S110 Function Manual page 235

Search for reference, step 2: Synchronizing to the reference zero mark
(encoder zero mark or external zero mark)
Reference cam available (p2607 = 1):
In step 2, the drive accelerates to the velocity, specified in p2608 (zero mark approach
velocity) in the direction opposite to that specified using binector input p2604 (reference point
approach start direction). The zero mark is expected at distance p2609 (max. distance to
zero mark). The search for the zero mark is active (status bit r2684.0 = "1" (search for
reference active)) as soon as the drive leaves the cam (p2612 = "0") and is within the
tolerance band for evaluation (p2609 - p2610). If the position of the zero mark is known
(encoder evaluation), the actual position of the drive can be synchronized using the zero
mark. The drive starts the search for reference (see step 3). The distance moved between
the end of the cam and the zero mark is displayed in diagnostics parameter r2680
(difference between the cam - zero mark).
Encoder zero mark available (p0495 = 0), no reference cam (p2607 = 0):
Synchronization to the reference zero mark begins as soon as the signal at binector input
p2595 (start referencing) is detected. The drive accelerates to the velocity, specified in
parameter p2608 (zero mark approach velocity) in the direction specified by the signal of
binector input p2604 (reference point approach start direction).
The drive synchronizes to the first zero mark and then starts to travel towards the reference
point (see step 3).
Note
In this case the direction of approach to the reference zero mark is the opposite to the axes
with reference cams!
External zero mark present (p0495 ≠ 0), no reference cam (p2607 = 0):
Synchronization to an external zero mark begins as soon as the signal at binector input
p2595 (start referencing) is detected. The drive accelerates to the velocity, specified in
parameter p2608 (zero mark approach velocity) in the direction specified by the signal of
binector input p2604 (reference point approach start direction). The drive synchronizes to the
first external zero mark (p0495). The drive continues to travel with the same velocity and
travel is started to the reference point (refer to step 3).
Note
The velocity override is inoperative during this process.
An equivalent zero mark can be set using parameter p0495 (equivalent zero mark input
terminal) and the corresponding digital input selected. As standard, for increasing actual
position values, the 0/1 edge is evaluated and for decreasing position actual values, the 1/0
edge. For the equivalent zero mark, this can be inverted using parameter p0490 (invert
measuring probe or equivalent zero mark).
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions
7.3 Function modules
235