User`s manual

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6.14 Writing in Program during CPU Module RUN
6.14.1 Online change in ladder mode
6
FUNCTIONS
(e) 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
1) 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.
The corresponding instructions are LDF,ANDF,ORF,MEF,PLF.
Diagram 6.27 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
X100 status
X100
M0
X100
M0
X100
M0
[ PLF M0 ]
X100
A
A
Completion of online change
Trailing edge instruction is
executed even the execution
condition is OFF OFF.