Siemens SINUMERIK 840D sl Function Manual page 1765

2.3.7 Fixed feedrate values (840D, 810D)
Function
The machine data can be used to define 4 fixed feedrate values, which can be activated via
the interface signal. The function is possible in AUTOMATIC and JOG modes.
Behavior in AUTOMATIC mode
The fixed feedrate, which has been selected, is used instead of the programmed feedrate.
The following MDs and interface signals can be used to select fixed feedrates for
path/geometry axes:
• MD12202 $MN_PERMANENT_FEED[n] (fixed feedrates for linear axes)
• MD12204 $MN_PERMANENT_ROT_AX_FEED[n] (fixed feedrates for rotary axes)
• IS "Activate fixed feedrate x for path/geometry axes" (DB21, ... DBX29.0- 29.3)
The contour travels at the activated fixed feedrate, instead of using the programmed
feedrate.
Behavior in JOG mode
The fixed feedrate selected via the interface signal is applied during travel instead of the
JOG velocities set.
The travel direction is specified via the interface signal.
The following MDs and interface signals can be used to select fixed feedrates for
path/geometry axes and for machine data:
• MD12202 $MN_PERMANENT_FEED[n] (fixed feedrates for linear axes)
• MD12204 $MN_PERMANENT_ROT_AX_FEED[n] (fixed feedrates for rotary axes)
• IS "Activate fixed feedrate x for machine axes" (DB31, ... DBX3.2-3.5)
The axis travels at the activated fixed feedrate, instead of at the JOG velocity/JOG- rapid
traverse velocity set in MD.
Constraints
• The fixed feedrate is not active for spindles, positioning axes and tapping.
• During travel at fixed feedrate, the override is determined by machine data:
• When fixed feedrate is selected, it is not possible to activate DRF offset.
• The fixed feedrates are always linear feedrate values. Revolutional feedrates are
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
MD12200 $MN_RUN_OVERRIDE_0 (travel with override 0)
converted to linear feedrates internally.
Detailed description
2.3 Feedrate control
49