Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 695)

Paramacros
Chapter 28
28-21
This parameter reflects both the programmed and front-panel (external
mirror) status of mirroring on the axes.
#4001 to 4120
Modal Information
These are read-only parameters. They indicate the value of a modal
program word. NO TAG shows the modal program word that applies to
the given parameter number.
Table 28.G
Modal Data Parameters
Parameter Number Modal Data Value
#4001 to 4021 These correspond to the different G-code Groups 1-21
(see chapter 10) and show what G-code from group is currently active.
4108 Current E--word value
4109 Current F--word value
4113 Most recently programmed M-code
4114 Most recently programmed N--word
4115 Current program number O--word
4119 Current S--word value
4120 Current T--word value
For example, if currently programming in G02 mode at a feedrate of 100,
the parameters would be as follows:
G02 is a group 1 G-code, so its value of 02 is set to parameter number
4001.
The feedrate programmed with an F--word gives parameter number 4109 a
value of 100.