06.03
10.5 Axes and spindles
10-370
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Axis-specific
Signals from PLC to axis/spindle
31, ...
16.2–16.0
Actual gear stage
31, ...
16.3
Gear switched
31, ...
16.6
No speed monitoring when changing the gear
31, ...
18.4
Oscillation by the PLC
31, ...
18.5
Oscillation speed
Axis-specific
Signals from axis/spindle to PLC
31, ...
82.2–82.0
Set gear stage
31, ...
82.3
Switch gear
31, ...
84.7
Active spindle mode “Control mode”
31, ...
84.6
Active spindle mode “Oscillation mode”
10.5.25 Positioning the spindle
The NC 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
To absolute position (0 – 360 degrees)
Incremental position (+/– 999999.99 degrees)
Block change when position reached
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 “Fine exact stop” 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 in machine data.
The contour monitoring function is activated as soon as the control mode
switches to position control.
Table 10-43
Spindle positioning: Machine data
Axis-specific ($MA_ ...)
35300
SPIND_POSCTRL_VELO
Creep 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
10 NC Start-Up with HMI Advanced
