Siemens SINUMERIK 828D

S1: Spindles
16.4 Configurable gear adaptation
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1301
Gear stage change in synchronized actions, FC18 and DBB30
The actual gear stage signaled from the PLC is always evaluated by the NC when the gear stage is changed.
The gear stage is always changed if a value of "0" is read from the NC. When reading a value greater than "0", a
comparison is made between the requested and active gear stage. The gear stage is only changed with the PLC
if the two values are not equal and the NC/PLC interface signal DB31,...DBX82.3 (change over gear) is then
output.
Boundary conditions
• Output of DB31, ... DBX16.0-2 = 0
When the gear is disengaged, the PLC must enter gear stage 0 in the NC/PLC interface DB31, ... DBX16.0-2
(actual gear stage A to C).
• Enabling the gear stage change
The precondition for a gear stage change after reaching gear stage 0 is the general enable of the gear stage
change via via machine data:
MD35010 $MA_GEAR_STEP_CHANGE_ENABLE (assign parameters to the gear stage change)
MD35090 $MA_NUM_GEAR_STEPS (number of gear stages set up)
MD35092 $MA_NUM_GEAR_STEPS2 (2nd gear stage data set: Number of gear stages that have been
created) if MD35010 $MA_GEAR_STEP_CHANGE_ENABLE, bit 5=1 (tapping without compensating chuck)
• PLC user program/ POWERON ASUB
The PLC user program or POWERON ASUB should ensure that when the gear is disengaged (gear stage 0)
before spindle motion, a gear stage change request is programmed. For instance, this can be realized with
M41 in the ASUB. Spindle motion such as e.g. in JOG or in axis operation does not generate any gear stage
change itself.
Example
Example for the sequence to select the first gear stage after POWERON
1. POWERON.
2. The PLC user program determines, in the mechanical environment, the "Gear is disengaged" state.
3. The PLC transfers the "Gear is disengaged" state to the NC by setting:
DB31,...DBX16.0-2 = 0
4. Part program start or POWERON ASUB.