Siemens SINUMERIK 840Di Function Manual page 1550

Detailed Description
2.3 Configurable gear adaptation
Oscillation via PLC
NC/PLC IS:
DB31, ... DBX18.4 (oscillation via PLC)
and
DB31, ... DBX18.5 (oscillation speed)
accelerates the spindle motor to the speed (with oscillation acceleration) defined in machine
data:
MD35400 $MA_SPIND_OSCILL_DES_VELO (oscillation speed).
The direction of rotation is defined by NC/PLC IS:
DB31, ... DBX18.7 (set direction of rotation CCW)
and
DB31, ... DBX18.6 (set direction of rotation CW).
The oscillation movement and the two times t1 and t2 (for clockwise and counterclockwise
rotation) must be simulated on the PLC.
Special points to be noted
Setting/Resetting the NC/PLC IS and machine data in oscillation mode:
• To decelerate the spindle, the PLC user need not set NC/PLC IS:
• The gear step change should always be terminated with NC/PLC IS:
• NC/PLC IS:
• If NC/PLC IS:
• The acceleration is defined in machine data:
2-46
DB31, ... DBX4.3 (spindle stop).
The spindle is brought to a standstill internally by the control when a gear step change is
requested.
DB31, ... DBX16.3 (gear changed).
DB31, ... DBX18.5 (oscillation speed)
should be used to support mechanical engagement of the gear.
It has no effect on the internal control mechanism for the gear step change procedure
and should therefore only be set as necessary.
DB31, ... DBX18.5 (oscillation speed)
is reset, oscillation mode stops.
However, the spindle remains in "oscillation mode".
MD35410 $MA_SPIND_OSCILL_ACCEL.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)