Siemens SINAMICS S120 Function Manual page 262

Extended Functions
Function module "basic positioner"
Flying referencing
The mode "flying referencing" (also known as post-referencing, positioning monitor-
ing), 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 in-
put for positioning/setting-up) and is superimposed on the currently active mode.
The flying referencing can be selected both for incremental as well as for absolute
measuring systems.
For "flying referencing" while incrementally positioning (relative), it can be selected
as to whether the correction value for the traversing distance should be taken into
account or not (p2603).
The "flying referencing" is activated by a 0/1 edge at binector input p2595 (start
referencing). During the complete referencing operation, the signal at binector input
p2595 (start referencing) must be set otherwise referencing is interrupted.
Status bit r2684.1 (passive/flying referencing active) is connected with binector in-
put p2509 (activate measuring probe evaluation) – it activates the measuring probe
evaluation. Binector inputs p2510 (measuring probe selection) and p2511 (measur-
ing probe edge evaluation) can be used to set which measuring probe (1 or 2) and
which measuring edge (0/1 or 1/0) is used.
The connector input p2660 (measured value, referencing) is supplied with the mea-
sured value via parameter r2523 when the measuring probe pulse is received. The
validity of the measured value is signaled using r2526.2 at binector input p2661
(measured value, valid feedback signal).
The the following happens:
S If the drive has still not been referenced status bit r2684.11 (reference point set)
is set to "1".
S If the drive has already been referenced, at the start of the flying referencing,
status bit r2684.11 (reference point set) is not reset.
S If the drive has already been referenced and if the absolute value of the position
difference is less than the inner window (p2601), then the old position actual
value is kept.
S If the drive has already been referenced and the absolute value of the position
difference is greater than the outer window (p2602), alarm A07489 (reference
point correction outside window 2) is output and status bit r2684.3 (print mark
outside window 2) is set. The position actual value is not corrected.
S If the drive has already been referenced and the absolute value of the position
difference is greater than the inner window (p2601) and less the outer window
(p2602), then the position actual value is corrected.
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© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition