Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 183

Sequence Control Instructions
150
When nesting interlocks, assign interlock numbers so that the nested program
section does not exceed the outer program section.
a
MILH
A1
b
MILH
A2
MILC
A3
MILC
Other instructions can be input between the MILC(519) instructions, as shown
in the following diagram.
a
MILH
100.00
A1
b
MILH
100.01
A2
MILC
A3
MILC
If there is an ILC(003) instruction between an MILH(517) and MILC(519) pair,
the program section between MILH(517) and ILC(003) will be interlocked.
0
1
0
The nested program section
must not go beyond the outer
program section.
1
0
1
1
Other instructions can be inserted between
two MILC(519) instructions. In this case,
sections A1 and A3 operate together. (They
are interlocked when "a" is OFF, regardless
of the ON/OFF status of "b".)
0
Section 3-4