Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 302)

Introduction to Programming
Chapter 10
10-34
The O-word is used to define a program name. To use an O word as a
program name it must be the first block entered in a program. This block
can be used to identify a program when reading from a tape (when
program name is selected as “automatic” from the device setup menu).
This is useful when many programs are placed together on a single tape.
An O-word can have up to 5 numeric characters following it.
When the same series of blocks are repeated more than once it is usually
easier to program them using a subprogram.
This section explains:
Main and subprograms
Subprogram calls
Important: To make jumps, loops, or calculations within an executing
program or subprogram, use any of the paramacro features described in
chapter 28.
P-words in a subprogram call (M98) or paramacro call are used to
designate the specific program being called. The P address is followed by
the program name being called.
L-words in a subprogram call (M98) and some cycles are used to designate
a repeat count for a subprogram. The number following the L address
designates the number of times a subprogram is executed consecutively
before execution is returned to the main program.
For details on subprograms, see section 10.3.
The spindle function has two modes:
Spindle Mode: Function:
Constant Surface Speed Mode (G96) maintains a workpiece’s speed across a tool equal to a desired
cutting speed independent of the diameter.
Constant Spindle RPM Mode (G97) maintains a constant spindle speed equal to the designated
S-word making the actual cutting speed dependant on the
working diameter.
Spindle speed and cutting speed values are programmed designated by an
S-word, followed by up to 4 digits. S-words are modal and remain active
until you designate another S-word is designated. Use a common S-word
to program all of the spindles AMPed to be in the system.
10.5.9
O-Words (Program Names)
10.5.10
P,L Words (Main Program
Jumps and Subprogram
Calls)
10.5.11
S-Words (Spindle Speed)