Siemens SINUMERIK 840D Function Manual page 171

Behavior in JOG mode
The axis is traversed with the activated fixed feedrate instead of the configured JOG velocity /
JOG rapid traverse velocity. The travel direction is specified via the interface signal.
Parameterization
The setting of the fixed feedrates is performed:
● For linear axes with the machine data:
MD12202 $MN_PERMANENT_FEED[<n>]
● For rotary axes with the machine data:
MD12204 $MN_PERMANENT_ROT_AX_FEED[<n>]
where <n> = 0, 1, 2, 3 (for fixed feedrate 1, 2, 3, 4)
Note
The fixed feedrates are always linear feedrate values. Switchover to linear feedrate is
conducted internally even in case of revolutional feedrate.
Activation
The fixed feedrates are activated via NC/PLC interface signals:
● In AUTOMATIC mode for path/geometry axes using the channel-specific interface signals:
DB21, ... DBX29.0 (activate fixed feedrate 1)
DB21, ... DBX29.1 (activate fixed feedrate 2)
DB21, ... DBX29.2 (activate fixed feedrate 3)
DB21, ... DBX29.3 (activate fixed feedrate 4)
● In JOG mode for machine axes using the axis-specific interface signals:
DB31, ... DBX3.2 (activate fixed feedrate 1)
DB31, ... DBX3.3 (activate fixed feedrate 2)
DB31, ... DBX3.4 (activate fixed feedrate 3)
DB31, ... DBX3.5 (activate fixed feedrate 4)
Supplementary conditions
Effectiveness
The function "Fixed feedrate values" is not active:
● For spindles
● For positioning axes
● When tapping
Override = 0
The traversing behavior for override = 0 depends on the setting in machine data:
MD12200 $MN_RUN_OVERRIDE_0
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
V1: Feedrates
5.4 Feedrate control
171