Siemens SINUMERIK 840D Function Manual page 830

S1: Spindles
18.8 Spindle monitoring
Further information
The detailed description of the system variables can be found in:
List Manual, System Variables
NC/PLC interface signals
The limit or increase of the spindle speed is signaled with the following NC/PLC interface
signals:
● DB31, ... DBX83.1 (speed setpoint limited)
● DB31, ... DBX83.2 (speed setpoint increased)
Boundary conditions
Spindle mode
The values delivered by the system variables depend on the spindle mode:
● Speed control mode:
All system variables deliver current values.
● Positioning mode:
The system variables $AC_SMAXVELO, $AC_SMAXACC and $AC_SPIND_STATE
deliver valid values. The system variables $AC_SMINVELO and $AC_SMINVELO_INFO
deliver the data that becomes effective on changing to the speed control mode.
● Axis mode (e.g. if the spindle is used by a transformation TRANSMIT, TRACYL,... or follows
a path motion as a special axis):
The system variable $AC_SPIND_STATE can also be used in the axis mode. Separate
system variables are available in the axis mode for dynamic data:
$AA_VMAXM, $AA_VMAXB and $AA_VLFCT.
SERUPRO block search
The following control response is obtained for a SERUPRO block search:
● The system variable $AC_SMAXVELO / $AC_SMAXACC delivers the maximum
representable speed / acceleration.
● $AC_SMAXVELO_INFO and $AC_SMAXACC_INFO deliver the VALUE "0" (no limitation
active).
● $AC_SMINVELO and $AC_SMINVELO_INFO deliver data as for normal part program
processing.
● $AC_SPIND_STATE returns the states as set for SERUPRO.
Example
The effective/limiting spindle parameters for spindle 1 are written cyclically in the R parameter
and displayed as R parameter in the "Parameters" > "User variable" operating area on the HMI.
Program code
N05 IDS=1 WHENEVER TRUE DO $R10=$AC_SMAXVELO[1]
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA