Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 706)

Paramacros
Chapter 28
28-32
Input Flags:
There are 4-integer or 3-integer and 32-bit pattern input parameters
available. The part program may only read the values assigned to these
parameters; it may not write values to them. The paramacro input
parameters available to the part programmer are:
#1000 -- #1031 and #1040 -- #1071
These paramacro PAL parameters are used to display the binary
equivalent of the integer assigned to #1032. #1000 is the first bit, #1001
is the second bit, #1002 is the third bit, and so forth up to parameter
#1031 (which is the 32nd bit).
The second set of parameters, #1040 -- #1071, functions the same way.
#1032 -- #1035 and #1072 -- #1075
The control always interprets parameter #1032, #1033, #1034, and
#1035 as integer values regardless of how they are assigned in PAL (as
an integer or on a per bit basis). #1032 is the only parameter that may
also be interpreted by the control on a per-bit basis using parameters
#1000 - #1031. PAL may always interpret these values on either a
per-bit basis or as integer values.
The second set of parameters, #1072 -- #1075, functions the same way.
See the system installer’s documentation for a detailed description of the
use and operation of these input flags.
Output Flags:
Output flags function almost identically to input flag with one key
difference. Where input flags may only be read by the part program,
output flags may be both read and written to by the part program.
Typically these are used only to output information to the PAL program
from the part program; however, if the available number of input flags is
not sufficient for a given application, the Output flags may also be used to
send information to the part program from PAL.