Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 263

Sequence Control Instructions
224
When nesting interlocks, assign interlock numbers so that the nested program
section does not exceed the outer program section.
a
b
Execution
condition
a b
OFF ON Interlocked
OFF
ON OFF Not interlocked
ON Not interlocked
MILH
0
A1
MILH
1
A2
MILC
0
A3
The nested program section
must not go beyond the outer
MILC
program section.
1
Program section
A1 A2
Interlocked
Interlocked
Not interlocked
Section 3-5
A3
Not interlocked
Interlocked
Not interlocked