Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 773)

Chapter 30
Using a 9/Series Dual--processing System
30-5
Error Messages
The control displays error messages on the screen for only the currently
active process (except on split-screens). The name of the currently active
process flashes in reverse video if an error occurs in another process.
Change to the appropriate process to display the current errors for that
process.
On a split-screen display, the control displays the full error messages for
both processes, regardless of which process is currently active.
The control keeps separate error message logs for each process. The error
logs list the errors in sequential order.
Refer to page NO TAG for more details on error messages.
Single-Digit Feedrates
Both processes share one table of single-digit feedrates. The control looks
to the single-digit feedrate table when it encounters a single-digit F-word
during block execution. The feedrate in this table that corresponds to the
single digit becomes the active feedrate. You cannot define different
single-digit feedrate tables for each process.
The rapids for each individual axis determine the feedrate used for F0.
Your system installer determines the rapid for each axes.
Refer to page 3-23 for information on single-digit feedrates.