Implicit Transition To Axis Mode - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles

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Change to spindle mode

The parameter set 1 ... 5 is selected for the active gear stage.

The feedforward control is activated, except for tapping with compensating chuck, if the

following applies:

MD32620 $MA_FFW_MODE (feedforward control mode) ≠ 0

Spindle mode: Parameter set according to the gear stage

Implicit transition to axis mode

The control detects the transition to axis mode automatically from the program sequence and

generates the requisite M70 sequence in the control. The situation will dictate which steps are

performed. At most, these will include:

1. Stopping the spindle

2. Switching on of the position control, treatment of feedforward control and parameter block

3. Position synchronization of the block preparation (internal preprocessing stop, if necessary)

This function is always active. Explicit programming of M70 in the part program is therefore

basically not necessary.

Sequence of the implicit transition to axis mode (M70 is not programmed in the part program):

● Transition from speed control mode (M3, M4, M5, SPCOF, ...) to axis mode:

The transition is detected internally by the control, and an intermediate block is inserted in

front of the block which requests the axis mode. The block created contains the M70

functionality. The execution duration for this block is more or less the same as the time

required to execute a programmed M70 block. Differences may arise in the event of short

switchovers when the spindle is stationary (no braking time) if the implicit generation and

output of the auxiliary function M70 to the PLC is dispensed with (see MD35035).

● Transition from positioning mode (M19, SPOS, SPOSA) to axis mode:

The transition is executed immediately and without the generation of an intermediate block.

Configured accordingly (see MD35035), the auxiliary function M70, which is generated

implicitly, is output to the PLC when the block in which the spindle has its axis mode is

Axes and spindles

Function Manual, 06/2019, A5E47437747B AA

Parameter set

S1: Spindles

18.2 Operating modes

Spindle mode

Sinumerik 840d sl