Efficient Networks Siemens Sinamics S120 - Manual (Page 262)

Function modules
7.9 Basic positioner
Drive Functions
262
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
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Figure 7-18 Example: homing with reference cam
The signal on binector input p2595 (start homing) 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 (homing type selection). The signal in binector input p2595 (start homing) 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 homing 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 homing
process, synchronization to the reference zero marks is started straight away (see step 2) for
these axes.
Search for reference, step 1: travel to reference cam
If there is no reference cam present (p2607 = 0), go to step 2.
When the homing process is started, the drive accelerates at maximum acceleration (p2572)
to the reference cam approach velocity (p2605). The direction of the approach is determined
by the signal of binector input p2604 (search for reference start direction).
When the reference cam is reached, this is communicated to the drive using the signal at
binector input p2612 (reference cam); the drive then brakes down to standstill with the
maximum deceleration (p2573).
If a signal at binector input p2613 (reversing cam, minus) or at binector input p2614
(reversing cam, plus) is detected during the search for reference, the search direction is