Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 736)

Paramacros
Chapter 28
28-36
#1132 -- #1135 and #1172 -- #1175
The control always interprets these parameters as integer values. #1132
is the only parameter that may also be interpreted by the part program
on a per-bit basis using parameters #1100 #1131.
The second set of parameters, #1172 -- #1175, functions the same way.
See the system installer’s documentation for a detailed description of the
use and operation of these input flags.
These parameters are available only on dual-process systems (see chapter
30 for details). These parameters provide a link through which common
data can be passed between the different processes of the machine. The
shared dual-process parameters are paramacro parameter numbers:
#7100 to #7199
These parameters are global. This means that the same set of parameters
can be called by any program, macro, subprogram, or MDI program in any
process.
All shared dual-process parameters are saved at power-down. This means
that they retain their value even after power to the control is lost.
Synchronization Problems with Shared Dual-Process Parameters
The programmer must concern himself with timing when changing dual
process paramacro parameters that are used in more than one process.
When you change a shared dual-process paramacro parameter that is to be
used in an additional, currently executing process, you should always use a
synchronization M-code (with setup). This will help prevent timing errors
that can develop when different values than expected are used due to setup
block considerations. Refer to page 30-8 for details on using
synchronization M-codes with shared dual-process parameters.
28.4.5
Shared Dual-Process
Parameters (#7100 - 7199)