Siemens Sinamics S120 Function Manual page 369

● Encoder zero mark available (p0494 = 0 or p0495 = 0)
● External zero mark available (p0494 ≠ 0 or p0495 ≠ 0)
Step 3: Travel to reference point
Travel to the reference point is started when the drive has successfully synchronized to the
reference zero mark (see step 2). Once the reference zero mark has been detected, the
drive accelerates on-the-fly to the reference point approach velocity set in parameter p2611.
The drive moves through the reference point offset (p2600), i.e. the distance between the
zero mark and reference point.
If the axis has reached the reference point, then the position actual value and setpoint are
set to the value specified using connector input p2598 (reference point coordinate) (as
standard, connector input p2598 is connected with adjustable parameter p2599). The axis is
then homed and the status signal r2684.11 (reference point set) set.
Note
The velocity override is inoperative during this process.
If the braking distance is longer than the reference point offset or a direction reversal is
required as a result of the selected reference point offset, then after detecting the reference
zero mark, the drive initially brakes to standstill and then travels back.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
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!
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 (p0494 or p0495)
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 and the corresponding digital input selected using
parameters p0494 or p0495
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).
. The drive continues to travel with the
*)
(equivalent zero mark input terminal). As standard, for
*)
Function modules
7.8 Basic positioner
, no reference cams (p2607 = 0):
*)
, no reference cams (p2607 = 0):
*)
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