01/2007
11.5 Axes and spindles
11-374
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
Axis–specific Signals from PLC to axis/spindle
31, ... 16.2–16.0 Actual gear step
31, ... 16.3 Gear changed
31, ... 16.6 No speed monitoring when changing the gear
31, ... 18.4 Oscillation via PLC
31, ... 18.5 Reciprocating speed
Axis–specific Signals from axis/spindle to PLC
31, ... 82.2–82.0 Set gear step
31, ... 82.3 Change gear stage
31, ... 84.7 Active spindle control mode
31, ... 84.6 Active spindle mode oscillation mode
11.5.25 Position spindle
The NCK provides an oriented spindle stop function with which the spindle can
be moved into a certain position and held there (e.g. for tool changing pur-
poses). Several programming commands are available for this function which
define the approach and program processing.
References: /PA/ Programming Guide
S1 Spindles
S To absolute position (0–360 degrees)
S Incremental position (+/– 999999.99 degrees)
S Block change when position reached
S Block change on block end criterion
The control brakes the spindle down to creep speed at the acceleration rate for
speed operation.
If the creep speed has been reached (INT ”Spindle in setpoint range”), the con-
trol branches into position control mode and the acceleration rate for position
control mode and the K
V
factor become active.
The interface signal ”Exact stop fine” is output to indicate that the programmed
position has been reached (block change when position reached).
The acceleration rate for position control mode must be set such that the current
limit is not reached. The acceleration rate must be entered separately for each
gear stage.
If the spindle is positioned from zero speed, it is accelerated up to a maximum
speed corresponding to creep speed; the direction is defined via machine data.
The contour monitoring function is activated as soon as the control mode
switches to position control.
Table 11-42 Spindle positioning: Machine data
Axis–specific ($MA_ ... )
35300 SPIND_POSCTRL_VELO Shutdown speed
35350 SPIND_POSITIONING_DIR Direction of rotation when positioning from the
standstill
35210 GEAR_STEP_POSCTRL_ACCEL Acceleration in position control mode
Functionality
Machine data
11 NCK Commissionin
with HMI Advanced
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