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Flying referencing
Inaccuracies in the actual value acquisition are compensated with flying referencing. This
increases the load-side positioning accuracy.
The "on-the-fly referencing" mode (also known as post-referencing), which is selected using
a "1" signal at binector input p2597 (select referencing type), can be used in every mode
(jogging, traversing block and direct setpoint input for positioning/setup) and is superimposed
on the currently active mode. Flying referencing can be selected both with incremental and
absolute measuring systems.
With "flying referencing" during incremental positioning (relative), you can select whether the
offset value is to be taken into account for the travel path or not (p2603).
"Flying referencing" is activated by a 0/1 edge at binector input p2595 (start referencing).
The signal in binector input p2595 (start referencing) must be set during the entire
referencing process otherwise the process is aborted.
Status bit r2684.1 (passive/flying referencing active) is linked with binector input p2509
(activate measurement probe evaluation). It activates measurement probe evaluation.
Binector inputs p2510 (measurement probe selection) and p2511 (measurement probe edge
evaluation) can be used to set which measurement probe (1 or 2) and which measurement
edge (0/1 or 1/0) is to be used.
The probe pulse is used to supply connector input p2660 (referencing/homing measured
value) with the measured value via parameter r2523. The validity of the measurement is
reported to binector input p2661 (measurement valid feedback) via r2526.2.
Note
The following must always apply to the "Flying referencing mode" windows:
p2602 (outer window) > p2601 (inner window).
See function diagram 3614 for more information on the "Flying referencing mode" function.
The following then happens:
● If the drive has not yet been referenced, status bit r2684.11 (reference point set) is set to
"1".
● If the drive has already been referenced, status bit r2684.11 (reference point set) is not
reset when starting flying referencing.
● If the drive has already been referenced and the position difference is less than the inner
window (p2601), the old actual position value is retained.
● If the drive has already been referenced and the position difference is more than the outer
window (p2602), alarm A07489 (reference point offset outside window 2) is output and
the status bit r2684.3 (pressure mark outside window 2) set. No offset to the actual
position value is undertaken.
● If the drive has already been referenced and the position difference is more than the inner
window (p2601) and less that the outer window (p2602), the actual position value is
offset.
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Functions, monitoring and protective functions
9.4 Extended functions
669
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