Omron CJ - REFERENCE MANUAL 02-2010 Reference Manual page 218

3. Instructions
Hint
• If there are bits which you want to remain
ON in an interlocked program section, set
these bits to ON with SET just before
IL(002).
• It is often more efficient to switch a program
section with IL(002) and ILC(003). When
several processes are controlled with the
same execution condition, it takes fewer
program steps to put these processes
between IL(002) and ILC(003).
Precautions
• The cycle time is not shortened when a section of the program is interlocked because the interlocked
instructions are executed internally.
• In general, IL(002) and ILC(003) are used in pairs, although it is possible to use more than one
IL(002) with a single ILC(003) as shown in the following diagram. If IL(002) and ILC(003) are not
paired, an error message will appear when the program check is performed but the program will be
executed properly.
• IL(002) and ILC(003) cannot be nested, as in the following diagram. (Use MILH(517)/MILR(518) and
MILC(519) when it is necessary to nest interlocks.)
182
Execution
condition
a b
OFF ON Interlocked
OFF OFF Interlocked
ON OFF Not interlocked
ON ON Not interlocked
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Program section
A B
Interlocked
Interlocked
Interlocked
Not interlocked