User-Specific Configurations - Siemens SINUMERIK 840D sl Function Manual

Note
Since the collision protection function extrapolates the target positions from the "current
velocity + maximum acceleration (or +20%)", the monitoring alarm may be activated
unexpectedly at reduced acceleration rates:
Example:
PMaster = X, PSlave = X2, $MA_CC_COLLISION_WIN = 10mm
Starting point in part program: X=0.0 X2=20.0
N50 G0 X100 X2=90
; the monitoring alarm is activated because X and X2 are interpolating together: for this reason,
the acceleration rate of X2 < maximum acceleration.
Remedy:
● N50 G0 POS[X]=100 POS[X2]=90
● or switch the monitoring function off.
18.4

User-specific configurations

Parking the machining head
In this context, "parking" means that the relevant machining head is not involved in workpiece
machining. All axes are operating under position control and positioned at exact stop.
Even if a machining head is being used in production, coupling should be active! This is
essential primarily if only the second head (Y2....) is being used. "Axis/spindle inhibit" must
then be set axially (PLC -> NCK) for the "parked" head.
Note
When an axis/spindle inhibit is active, a part program can be executed if this axis is not
operating under position control.
Spindle functionalities
Since an MCS coupling cannot be activated for spindles, other types of solutions should be
configured for these.
● Positioning the spindle (SPOS= ...)
Instead, a cycle is called from SPOS. SPOS is called for all active spindles in this cycle.
● Speed default
Speed and direction of rotation inputs can be detected via synchronized actions or PLC
and passed on to all other active spindles.
● Synchronous spindle function
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
TE6: MCS coupling - 840D sl only
18.4 User-specific configurations
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