Mitsubishi Electric MELSEC-Q00U(J)CPU

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CHAPTER 3 FUNCTIONS
3
3.12 Writing Programs While CPU Module is in RUN Status 3.12.3 Precautions for online change
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
online change
END
1 scan
END END00 0
OFF OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON OFF
X0 status
X0
M0
X0
M0
The fall instruction is executed
even if the execution condition is off off.
[ PLF MO ]
X0
A
A
(a) Operation when selecting "Execute fall instruction"
Completion of
online change
END
1 scan
END END00 0
OFF OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON OFF
X0 status
X0
M0
X0
M0
The fall instruction is not
executed even if the execution
condition is off off.
[ PLF MO ]
X0
A
A
(b) Operation when not selecting "Execute fall instruction"
The fall instruction is not executed
when the timing of completion of
online change and execution
condition of on off are met.