Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 684)

Paramacros
Chapter 20
20-40
calling the paramacro), followed by the value to assign that parameter. For
example:
G65P1001A1.1 B19;
assigns the value of:
1.1 to local parameter #1 in paramacro 1001
19 to local parameter #2 in paramacro 1001
Arguments can be specified as any valid parametric expression. For example:
G246A#100B[#500+10.0]C[SIN[#101]];