Mitsubishi Electric MELSEC iQ-R-R00CPU - Page 124

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5 WRITING DATA TO THE CPU MODULE
5.3 Precautions
• Falling instruction
When a falling instruction exists within the range to be changed, the falling instruction will not be executed even if the
execution condition (ON to OFF) is satisfied after completion of the online change (ladder block) or writing data to the
programmable controller.
• SCJ instruction
If an SCJ instruction exists within the range to be changed and the execution condition is satisfied at the completion of the
online change (ladder block) or writing data to the programmable controller, the program will jump without waiting for a single
scan.
(1) The falling instruction will not be executed even if the execution condition is OFF to OFF.
(2) If a completion of the online program change and a timing of satisfying the execution condition (ON to OFF) occur simultaneously, the falling instruction will
not be executed.
(1) The program jumps to the specified pointer.
(2) The program jumps to the specified pointer without waiting for a single scan.
END END END00 0
OFF
→ OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
→ OFF
X0
M0
X0
M0
(1)
[ PLF M0 ]
X0
A
A
(2)
Online change
completion
1 scan
Status of X0
END END END00 0
OFF → OFF
ON → ON
[ SCJ P0 ]
X0
A
A
OFF → ON
(1)
(1)
(2)
X0
X0
X0
OFF
ON
OFF
ON
OFF
ON
Online change
completion
1 scan
Status of X0
SCJ instruction
SCJ instruction
SCJ instruction