Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 460)

Programming Feedrates
Chapter 18
18-12
It is possible to select special feedrates that are assigned in AMP. This
covers the feedrates assigned by AMP for the single digit F--word and the
External feedrate switch. It does cover the feedrate for rapid moves or for
dry run.
Program a one-digit numeric value (1-9) following the F--code to select
various preset feedrates. The digits 1-9 have corresponding numeric
values for feedrate set in the F1-F9 table discussed in chapter 2.
Important: Single digit feedrates are always entered as per minute
feedrates (IPM or MMPM) regardless of the control’s current feedrate
mode. When a single digit feedrate is programmed, the control
automatically switches to the IPM or MMPM mode. The control
automatically switches back to the previously active feedrate mode when
the next feedrate is programmed that is not a single digit feedrate.
If there are no feedrates set in the tables that correspond to F1-F9, the
control treats F1-F9 as commanded feedrates.
Single digit F--word feedrates are affected by the setting of the switch as
regular feedrates. Blocks that are programmed to move at the rapid
feedrate are still executed in the rapid mode.
Important: A programmed F0 corresponds to the maximum cutting
feedrate (not normally the rapid feedrate) set in AMP by the system
installer. F0 generates an error if the single digit feedrate feature is not
used.
When calling a single digit F--word the F--word must be programmed with
no decimal point and a single digit. For example, F1 calls an assigned
feedrate correlating to the value set as feedrate 1. Designating F1 in a
program assigns a feedrate of 1 in the current feedrate mode.
18.3
Special AMP Assigned
Feedrates
18.3.1
Single Digit F- words