Siemens SINUMERIK 840D sl Function Manual page 748

Detailed description
2.11 Subroutine call through NC language replacement
2.11.4.2 Gear step change in active synchronous spindle coupling
Function
If a gear stage change is pending for the leading spindle of an active synchronous spindle
coupling, the a replacement subroutine can be called for the transmission of the gear stage
change. With the help of this replacement subroutine
• the coupling is triggered
• the gear stage change of the spindles involved in the coupling is executed
• The coupling is closed again
Activation of the replacement for gear stage change
MD30465 $MA_AXIS_LANG_SUB_MASK, Bit 0 =1
The system variable$P_SUB_AXFCT delivers a bit mask that corresponds to machine data
MD30465 $MA_AXIS_LANG_SUB_MASK. A set bit provides information about the spindle-
related replacement that is currently active.
Call time of the replacement subroutine
While programming the gear stage change with M41 to M45, the output response of this
auxialiary function to the PLC depends on bits 5, 6, 7 of the machine data:
MD22080 $MC_AUXFU_PREDEF_SPEC[12] to
MD22080 $MC_AUXFU_PREDEF_SPEC[16]
References
/FB1/Function Manual Basic Functions; Auxiliary Function Outputs to PLC (H2)
Output of M41 to M45
before or during the movememt
after the movement
Note
The call always takes place at the block start during automatic gear stage change with M40.
Application
Machines with parallel processing of workpieces such as e.g., a double spindle machine
190
Call of the replacement subroutine
At block start
At block end
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0