Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 179

When "Execute fall instruction" is checked in the "Options" window of a programming tool, 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. (Same operation as the High Performance model QCPU)
The corresponding fall instructions are LDF, ANDF, ORF, MEF, PLF, FCALLP, and EFCALLP. The following describes the
operation with and without "Execute fall instruction" selected.
Completion of
X0
online change
[ PLF MO ]
A
END 0 END 0
1 scan
X0 status
ON
X0
OFF
OFF OFF
ON
M0
OFF
ON
X0
OFF
ON OFF
ON
M0
OFF
(a) Operation when selecting "Execute fall instruction"
A END 0
The fall instruction is executed
even if the execution condition is off off.
Completion of
online change
X0
[ PLF MO ]
END 0 A END 0 A
1 scan
X0 status
ON
X0
OFF
OFF OFF
ON
M0
OFF
ON
X0
OFF
ON OFF
ON
M0
OFF
(b) Operation when not selecting "Execute fall instruction"
CHAPTER 3 FUNCTIONS
END 0
The fall instruction is not
executed even if the execution
condition is off off.
The fall instruction is not executed
when the timing of completion of
online change and execution
condition of on off are met.
177
3