Feedrate Control; Feedrate Disable And Feedrate/Spindle Stop - Siemens SINUMERIK 840D Function Manual

Output to PLC
The feedrate value can be output to the PLC:
● To the channel-specific NC/PLC interface via:
DB21, ... DBB158 - DBB193
● To the axis-specific NC/PLC interface via:
DB31, ... DBB78 - DBB81
The output time is specified with the machine data:
MD22240 $MC_AUXFU_F_SYNC_TYPE (output time of F functions)
The output is suppressed in the default setting (MD22240 = 3), because drops in velocity can
occur through the output of F functions to the NC/PLC interface in continuous-path mode.
For further information see Function Manual "Basic Functions", Section "H2: Auxiliary function
outputs to PLC".
Reset behavior
The behavior after the end of program or NC reset is specified by the machine data:
MD22410 $MC_F_VALUES_ACTIVE_AFTER_RESET (F function is active even after reset)
Value
0
1
5.4

Feedrate control

5.4.1

Feedrate disable and feedrate/spindle stop

Function
The "Feed disable" or "Feed/spindle stop" brings the axes to a standstill with adherence to the
braking characteristics With the exception for thread cutting G33, the programmed contour is
maintained.
Channel-specific feedrate disable
All axes (geometry and special axes) of a channel are stopped in all modes using the channel-
specific NC/PLC interface signal:
DB21, ... DBX6.0 (feedrate disable)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Meaning
The default values are effective after NC reset.
The last programmed FA values are effective after NC reset.
V1: Feedrates
5.4 Feedrate control
157