Measuring Probe Evaluation And Reference Mark Search - Siemens SINAMICS S120 Function Manual

Extended Functions
Function module position control
4.23.6

Measuring probe evaluation and reference mark search

Description
The function "Reference mark search" and "Measuring probe evaluation" can be
initiated and carried-out via binector input p2508 (activate reference mark search)
and p2509 (activate measuring probe evaluation). In this case, binector input
p2510 (measuring probe selection) and p2511 (measuring probe edge evaluation)
define the module for the measuring probe evaluation. The appropriate function is
started using a 0/1 edge at the appropriate input p2508 (activate reference mark
search) or p2509 (activate measuring probe evaluation) via the encoder control
word. Status bit r2526.1 (reference function) signals that the function is active
(feedback from the encoder status word). Status bit r2526.2 (measured value
valid) indicates the required measured value r2523 is available (position at the
reference mark or at the measuring probe).
If the function has been completed (position at the reference mark or at the
measuring probe has been determined) then r2526.1 (reference function active)
and r2526.2 (measured value valid) are still active and the measured value is pro-
vided via r2523 (measured value referencing) until the appropriate input p2508
(activating reference mark search) or p2509 (activate measuring probe evaluation)
is reset (0 signal).
If the function (reference mark search or measuring probe evaluation) has still not
been completed and the corresponding input p2508 or p2509 is reset, then the
function is interrupted via the encoder control word and status bit r2526.1 (refer-
ence function active) is reset via the encoder status word.
If both binector inputs p2508 and p2509 are simultaneously set, this causes the
active function to be interrupted and no function is started. This is indicated using
alarm A07495 "reference function interrupted" and remains until the signals at the
binector inputs are reset. The alarm is also generated if, during an activated func-
tion (reference mark search or measuring probe evaluation) a fault is signaled
using the encoder status word.
When selecting the function module "position control" these parameters (p2508 to
p2511) are pre-assigned "0". If the function module "basic positioner" is selected,
the functions "reference mark search" (for the function reference point search) and
"measuring probe evaluation" (for the function flying referencing) are initiated by
the function module basic positioner and the feedback signal (r2526, r2523) is fed
back to this (also refer to: Commissioning Manual, Chapter "Control and status
words for encoders").
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SINAMICS S120 Function Manual, 03/2006 Edition