54
cution condition for the IL(02) is OFF. When DIFU(13) or DIFD(14) is ex-
ecuted in an interlocked section immediately after the execution condition for
the IL(02) has gone ON, the execution condition for the DIFU(13) or
DIFD(14) will be compared to the execution condition that existed before the
interlock became effective (i.e., before the interlock condition for IL(02) went
OFF). The ladder diagram and bit status changes for this are shown below.
The interlock is in effect while 0000 is OFF. Notice that 1000 is not turned ON
at the point labeled A even though 0001 has turned OFF and then back ON.
0000
IL(02)
DIFU(13) 1000
ILC(03)
0001
0000
0001
ON
OFF
ON
OFF
1000
ON
OFF
A
There must be an ILC(03) following any one or more IL(02).
Although as many IL(02) as necessary can be used with one ILC(03),
ILC(03) cannot be used consecutively without at least one IL(02) in between,
i.e., nesting is not possible. Whenever a ILC(03) is executed, all interlocks
are cleared.
When more than one IL(02) is used with a single ILC(03), an error message
will appear when the program check is performed, but execution will proceed
normally.
There are no flags affected by these instructions.
The following diagram shows IL(02) being used twice with one ILC(03).
0000
0001
ILC(03)
IL(02)
0004
0005
0003
0002
IL(02)
0502
TIM 11
CP
R
CNT 01
10
0100
001.5 s
Precautions
Flags
Example
Interlock and Interlock Clear Section 5–7
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