Siemens SINUMERIK 840D Function Manual page 777

Mc axes and spindles

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Request gear stage change

A gear stage change can be requested:

● In the part program using:

– M41 ... M45

● In synchronized actions using:

– DO M40 S...

– DO M41... M45

● Through the PLC using the FC18 function block

● In the reset state through description of NC/PLC interface:

DB31, ... DBX16.0-16.2 (actual gear stage A to C)

The mechanically active gear stage can be communicated to the NC especially after a

If the spindle motor is attached to the spindle directly (1:1) or with a non-variable

transmission ratio (MD35010 = 0), then the M40 and M41 ... M45 auxiliary functions are not

relevant to this spindle.

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Automatic gear stage selection to the programmed speed S...

Direct selection of gear stages 1 ... 5

For MD35014 $MA_GEAR_STEP_USED_IN_AXISMODE = 1 ... 5

(see "Configurable gear step in M70 (Page 805)")

For MD35010 $MA_GEAR_STEP_CHANGE_ENABLE, Bit 5 = 1

Automatic gear stage selection to the programmed speed S...

Direct selection of gear stages 1 ... 5

For MD35014 $MA_GEAR_STEP_USED_IN_AXISMODE = 1 ... 5

S1: Spindles

18.4 Configurable gear adaptations

Sinumerik 840d sl