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6.12 Writing in Program during CPU Module RUN
6.12.3 Precautions for online change
6
FUNCTIONS
(3) Instructions do not operate normally at online change
When online change is performed, the following instructions do not operate normally.
• Trailing edge instruction
• Leading edge instruction
• SCJ instruction
(a) Trailing edge instruction
The trailing edge instruction is executed when the instruction is in a writing range
even the execution condition(ON OFF) is not established at the completion of
online change.
For preventing the trailing edge instruction execution, refer to POINT in this
section.
The corresponding instructions are LDF,ANDF,ORF,MEF,PLF,FCALLP,EFCALLP.
Figure 6.55 Trailing edge instruction operation
END
1 scan
END END00 0
OFF OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON ON
ON OFF
X0 status
X0
M0
X0
M0
X0
M0
[ PLF M0 ]
X0
A
A
Completion of online change
Trailing edge instruction is
executed even the execution
condition is OFF OFF.
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