Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 656)

Paramacros
Chapter 20
20-12
In Example 20.9, blocks N2 through N6 are executed 9 times. At that time
the condition in block N2 becomes false and program execution is
transferred to block N7.
Nesting is possible with a WHILE-DO-END command. We defined
nesting as one WHILE-DO-END program segment executing within
another WHILE-DO-END program segment. WHILE-DO-END nesting is
limited to 3 independent segments at one time.
Example 20.10 illustrates the use of nested WHILE-DO-END commands.
Example 20.10
Nested WHILE DO Commands
N1#1=1;
N2WHILE[#1LT10]DO1;
N3#1=[#1+1];
N4WHILE[#1EQ2]DO2;
N5...;
N6END2;
N7END1;
N8...;
In Example 20.10, blocks N2 through N7 are repeated until the condition
in block N2 becomes false. Within DO loop 1, DO loop 2 is repeated until
the condition in block N4 becomes false.
This section contains the following subsections:
Topic: On page:
Local Parameters Assignment 20-13
Common Parameters 20-15
System Parameters 20-16
PAL Parameters 20-37
The following subsections cover assigning different parameter values and
how to use these parameters in a paramacro. Paramacros use parameters in
place of numeric values. Parameters are used as variables.
There are 4 types of parameters that you can call in a paramacro:
local - independent set of variables assigned to each nested macro
common - variables available to all programs
system - variables that indicate specific system condition
PAL - provide variables shared between part and PAL programs
20.3
Parameter Assignments