External Oscillation Reversal - Siemens SINUMERIK 840D sl Function Manual

P5: Oscillation
12.3 Oscillation controlled by synchronized actions
Mode 1: The part length is adjusted such that the total of all calculated part lengths corresponds
exactly to the path up to the target point.
12.3.9

External oscillation reversal

For example, keys on the PLC can be used to change the oscillation area or instantaneously
reverse the direction of oscillation.
The edge-triggered PLC input signal DB31, ... DBX28.0 (oscillation reversal) is used to brake
the current oscillation motion and then traverse in the opposite direction. The braking phase
is signaled via the PLC output signal DB31, ... DBX100.2 (oscillation reversal active).
The braking position of the axis can be accepted as the new reversal position by means of the
PLC signal DB31, ... DBX28.4 (change reversal position).
The PLC input signal DB31, ... DBX28.3 (select reversal point) is ignored, but rather the change
affects the last initiated
No change in the reversal points applied via handwheel or JOG keys may be active for the
relevant axis. If handwheel or JOG key changes are currently active, display alarm 20081
(Braking position cannot be accepted as reversal position - handwheel active) will be
generated. The alarm is automatically reset when the conflict has been eliminated.
Hold time
No stop time is applied for a change of direction due to an
axis waits for the exact stop fine signal. Any configured exact stop condition is fulfilled.
Infeed motion
With non-modal oscillation, no infeed movement is performed for a change of direction due to
external oscillation reversal as the reversal position has not been reached and consequently
an
the appropriate synchronized action is not fulfilled.
System variables
The braking position can be scanned via system variable $AA_OSCILL_BREAK_POS1, when
approach to reversal position 1 is aborted or via
$AA_OSCILL_BREAK_POS2 when approach to reversal position 2 is aborted.
If the relevant reversal point is approached again, the position of the reversal point can be
scanned in $AA_OSCILL_BREAK_POS1 or $AA_OSCILL_BREAK_POS2.
In other words, only after an
between the values in $AA_OSCILL_BREAK_POS1 and $AA_OSCILL_REVERSE_POS1 or
the values in $AA_OSCILL_BREAK_POS2 and $AA_OSCILL_REVERSE_POS2.
External oscillation reversal can therefore be detected by a synchronized action (see Section
"Examples (Page 715)").
714
external oscillation reversal command.
External oscillation reversal command is there a difference
external oscillation reversal . The
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions