Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 265

Sequence Control Instructions
226
If there is an ILC(003) instruction between an MILR(518) and MILC(519) pair,
the ILC(003) instruction will be ignored and the full program section between
MILR(518) and MILC(519) will be interlocked.
a
If there is another MILH(517) or MILR(518) instruction with the same interlock
number between an MILH(517) and MILC(519) pair and the first MILH(517)
instruction's interlock is engaged, the second MILH(517)/MILR(518) will not
operate.
If there is another MILH(517) or MILR(518) instruction with the same interlock
number between an MILH(517) and MILC(519) pair and the first MILH(517)
instruction's interlock is not engaged, the second MILH(517)/MILR(518) will
operate normally.
a
b
Note The MILR(518) interlocks operate in the same way if there is another
MILH(517) or MILR(518) instruction with the same interlock number between
an MILR(518) and MILC(519) pair.
If there is an MILC(519) instruction with a different interlock number between
an MILH(517)/MILR(518) and MILC(519) pair, that MILC(519) instruction will
be ignored.
When input condition "a" is OFF, program
MILR
sections A1 and A2 are interlocked.
0
A1
The ILC(003) instruction is ignored.
ILC
A2
MILC
0
When input condition "a" is OFF, program
MILH
sections A1 and A2 are both interlocked,
0
even if input condition "b" is ON.
A1
MILH
When input condition "a" is ON and "b"
is OFF, only program section A2 is
0
interlocked.
A2
MILC
0
Section 3-5