5 Understanding Programming
5-68
CJ2 CPU Unit Software User’s Manual
Using Differentiated Instructions in Interlocks (IL - ILC Instructions)
In the following example, the previous value flag for the differentiated instruction maintains the previ-
ous 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.
Using Differentiated Instructions in Jumps (JMP(004) - JME(005) Instructions)
Just as for interlocks, the previous value flag for a differentiated instruction is not changed when the
instruction is jumped, i.e., the previous value is maintained.
• With downwardly differentiated instructions (DIFD(014) or instructions with a %), outputs will turn
ON when inputs turn OFF only when the previous value flag is ON.
• With both upwardly and downwardly differentiated instructions, outputs will turn OFF in the next
cycle.
Precautions for Correct UsePrecautions for Correct Use
Do not use the Always P_On Flag or A200.11 (First Cycle Flag) as the input bit for an upwardly
differentiated instruction. Do not use the Always P_Off Flag as the input bit for a downwardly dif-
ferentiated instruction. If either is used, the instruction will never be executed.
IL
ILC
DIFU
001000
0.00
0.01
000000
000001
001000
IL is
executing
IL is
executing
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