Siemens SINUMERIK 840D Function Manual page 795

Commissioning: NC/PLC interface signals
● DB31, ... DBX16.0 - 2 (actual gear stage)
● DB31, ... DBX16.3 (gear is changed)
● DB31, ... DBX18.4 (oscillation controlled by the PLC)
● DB31, ... DBX18.5 (oscillation enable)
● DB31, ... DBX18.6 (setpoint direction of rotation, clockwise)
● DB31, ... DBX18.7 (setpoint direction of rotation, counterclockwise)
● DB31, ... DBX61.4 (spindle stationary)
● DB31, ... DBX82.0 - 2 (set gear stage)
● DB31, ... DBX82.3 (change over gear stage)
● DB31, ... DBX83.5 (spindle in setpoint range)
● DB31, ... DBX84.6 (active spindle mode: oscillating mode)
Description of the sequence: Gear stage change
Parameterization: MD35010 $MA_GEAR_STEP_CHANGE_ENABLE, bit 0 = 1
Sequence:
● Deceleration of the spindle.
The braking action corresponds to an M5 movement.
● NC/PLC interface signals NC → PLC:
– DB31, ... DBX84.6 == 1 (oscillation mode)
– DB31, ... DBX82.3 == 1 (changeover gear stage)
– DB31, ... DBX82.0 - 2 == <set gear stage>
– DB31, ... DBX61.5 == 0 (position controller active)
● The load gear can now "disengage".
● Oscillation can now be executed from the NC or the PLC (refer below).
● Program execution continues after the feedback signal from the PLC to the NC that the gear
stage has been switched over and the new gear stage is active:
● DB31, ... DBX16.3 = 1 (gear stage is changed)
● DB31, ... DBX16.0 - 2 (actual gear stage)
● For measuring systems with indirect encoder (motor encoder) the referencing status is
deleted:
DB31, ... DBX60.4 / 5 = 0
Oscillation controlled by the NC
Requirement
● DB31, ... DBX18.5 = 1 (oscillation enable)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S1: Spindles
18.4 Configurable gear adaptations
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