Siemens SINUMERIK 828D Function Manual page 1338

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Table of Contents

S1: Spindles

16.7 Programming

Constant cutting rate setting

Defaults for constant cutting rate from part program, FC18 or synchronized actions are written to the following

setting data from all the usual sources:

SD43202 $SA_SPIND_CONSTCUT_S (cutting rate for spindle start via PLC interface)

Preconditions

The precondition for the definition of a constant cutting rate to be active is:

The spindle involved must be the master spindle in the channel that handles the spindle.

This condition is fulfilled if the following NC/PLC interface signal is set:

DB31, ... DBX84.0 = 1 (constant cutting rated is active)

Writing from the part program

When writing from the part program, the value for the constant cutting rate is interpreted as follows:

if G710 is active in the 12th G Group:

if G700 is set in the 12th G Group:

For G70, G71 and when writing from an external (HMI), the setting in the machine data:

MD10240 $MN_SCALING_SYSTEM_IS_METRIC

determines the interpretation of the written values.

Further explanations regarding the system of units (metric/inch) can be found in:

Function Manual, Basic Functions; Velocities, Setpoint/Actual Value Systems, Closed-Loop Control (G2)

Definition via FC18

If the constant cutting rate is defined using FC18, the setting of bit 6 in byte 2 in the "Signals to concurring

positioning axes" area determines how the speed value (bytes 8 ... 11) is interpreted.

Setting via synchronized actions

For definition via synchronized actions, analog to the part program, the feedrate type defines how the S value is

interpreted.

Reading from part program and synchronized actions

The programmed cutting rated actual value can be determined in the part program and in the synchronized

actions by reading the following system variables:

$P_CONSTCUT_S[<n>] (last programmed constant cutting rate)

$AC_CONSTCUT_S[<n>] (actual constant cutting rate)

Defined range of values of the two new system variables: RV = {0, DBL_Max}

The programmed cutting rate value can also be read via the OPI interface.

inch as [feet/min]

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

Basic Functions

Sinumerik 840d sl