Siemens SINUMERIK 840Di Function Manual page 1646

Detailed Description
2.3 Feedrate control
Part program
Note
The axial feedrate/path feedrate (F value) is the 100% feedrate.
Feedrates smaller than or equal to the axial feedrate/path feedrate can be implemented with
"Multiple feedrate values in one block" (F2 to F7 values).
The "Multiple feedrate values in one block" functionality is only available in conjunction with
the "Synchronized actions" function.
References:
/FB/Description of Functions, Basic Machine; Various Interface Signals and Functions (A2)
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.
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Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Feeds (V1)