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Sequence Control Instructions Section 3-4
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 prop-
erly.
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.)
Differential Instruction in
Interlocks
Differentiated instructions (DIFU(013), DIFD(014), or instructions with a @ or
% prefix) written between IL(002) and ILC(003) are executed according to
changes in memory status between when the interlock is started and when it
is released. If a differentiated condition is met, it will be effected when the
interlock is released.
Execution condition Program section
ab A B
OFF ON Interlocked Interlocked
OFF OFF Interlocked Interlocked
ON OFF Not interlocked Interlocked
ON ON Not interlocked Not interlocked
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