Siemens SINUMERIK 840D sl Programming Manual page 261

Note
The feed must be adjusted to suit the measuring task in hand.
In the case of
feedrates at which no more than 1 trigger event of the same type and no more than 4 trigger
events of different types occur in each position control cycle.
In the case of continuous measurement with
position control cycle must not exceed 8:1.
Trigger event
A trigger event comprises the number of the probe and the trigger criterion (rising or falling
edge) of the measuring signal.
Up to 4 trigger events of the addressed probe can be processed for each measurement; in
other words, up to 2 probes with 2 measuring signal edges each. The processing sequence
and the maximum number of trigger events depend on the selected mode.
Note
The following applies for measuring mode 1: The same trigger event may only be
programmed once in one measuring task.
With
eight rising edges and to eight falling edge for each probe. This enables higher feedrates
and speeds to be implemented.
References:
Function Manual, Extended Functions; Measurements (M5), Section: Axial measurement
Job Planning
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
and
MEASA MEAWA
, the number of measured values per position control cycle can be increased to
MEAC
4.8 Axial measurement (MEASA, MEAWA, MEAC) (option)
, the correctness of results can be only guaranteed for
, the ratio between interpolation cycle and
MEAC
Special motion commands
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