Omron CJ - PROGRAMMING MANUAL 08-2008 Programming Manual page 77

Basic Concepts
• Use in Interlocks (IL - ILC Instructions)
In the following example, the previous value flag for the differentiated
instruction maintains the previous interlocked value and will not output a
differentiated output at point A because the value will not be updated
while the interlock is in effect.
0000
00
0000
01
IL is
executing
• Use in Jumps (JMP - JME Instructions): Just as for interlocks, the pre-
vious value flag for a differentiated instruction is not changed when the
instruction is jumped, i.e., the previous value is maintained. Upwardly and
downwardly differentiate instructions will output the execution condition
only when the input status has changed from the status indicated by the
previous value flag.
Note a) Do not use the Always ON Flag or A20011 (First Cycle Flag) as
the input bit for an upwardly differentiated instruction. The instruc-
tion will never be executed.
b) Do not use Always OFF Flag as the input bit for a downwardly dif-
ferentiated instruction. The instruction will never be executed.
Section 2-1
(002)
IL
(013)
DIFU 001000
(003)
ILC
IL is
executing
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