Implicit Transition To Axis Mode - Siemens SINUMERIK 828D Function Manual

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Table of Contents

S1: Spindles

16.2 Operating modes

Implicit transition to axis mode

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

the requisite M70 sequence within the control system. 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 changeover

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, essentially not

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 loaded.

Output of auxiliary functions to PLC

The implicit transition to axis mode can be notified to the PLC in the form of an auxiliary function output.

Activation/Deactivation

The activation/deactivation of this functionality is done using machine data:

MD35035 $MA_SPIND_FUNCTION_MASK (spindle functions)

No auxiliary function output to the PLC in the case of M70 functionality which is

generated inside the control.

In the case of M70 functionality which is generated inside the control, the auxiliary

function M70 is generated and output to the PLC. The address extension

corresponds to the spindle number.

An auxiliary function M70 which is programmed in the part program is always output to the

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

Sinumerik 840d sl