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(3) Instructions do not operate normally during online change
When data are written to the CPU module in the RUN status, the following instructions do not operate normally.
• Fall instruction
• Rise instruction
• SCJ instruction
(a) Fall instruction
The fall instruction is executed when the instruction is in the data written to the CPU module in the RUN status,
even if the execution condition (on off) is not met.
For preventing the fall instruction execution during online change, refer to POINT in this section.
The corresponding fall instructions are LDF, ANDF, ORF, MEF, PLF, FCALLP, and EFCALLP.
Figure 6.53 Operation of the fall instruction
Completion of
online change
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
XO
MO
XO
MO
XO
MO
The fall instruction is executed
even if the execution condition is off off.
[ PLF MO ]
XO
A
A