Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 750)

Paramacros
Chapter 28
28-50
The L--word or any optional argument statements following a G66.1 can
contain any valid mathematical expression. For example:
G66.1 P1002 L[#1+1] A[12*6] B[SIN[#101]];
Example 28.20
G66.1 Macro Operation
N0100G90G17G00;
N0110G66.1P9400;
Macro 9400 is executed.
N0120G91G18G01; G91 and G18 become effective, 01 is assigned to parameter
#10, macro 9400 is executed.
N0130G03X1.; 03 is assigned to parameter #10, 1. is assigned to parameter
#24, macro 9400 is executed.
N0135; Macro 9400 is executed.
N0140G67; Macro 9400 is deactivated.
N0150M30; program end.
Any time the macro is called (while executing the G66.1), the L--word
programming the number of repetitions is in effect. Any attempt to
reprogram an L--word outside of a G66.1 block is interpreted as an
argument assignment for parameter #12.
Important: When nesting a macro (any macro including G66.1) within a
G66.1 macro, the outer G66.1 macro is executed after each individual
block of the nested macro, except for paramacro command blocks such as
assignment, goto, etc.
Example 28.21
Nesting a Modal Macro
N0100G66.1P1001;
N0200G65P1002;
After the execution of each individual block within the macro 1002, the
macro 1001 is called.
You can define the L--word or any optional argument statements in a G66.1
block as any valid parametric expression. For example:
G66.1 P1002 L[#1+1] A[12*6] B[SIN[#101]];