Mitsubishi Electric melsec q00ujcpu - Page 217

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To avoid execution of the fall instruction even when the execution condition (on off) is not met after data are written to the
CPU module in the RUN status, select "Trailing edge instructions are not executed" in the Options screen in GX Developer.
The option is deselected by default.
Figure 6.57 shows operations of the fall instruction depending on the setting of "Trailing edge instructions are not executed"
in GX Developer.
Figure 6.56 Options screen
Figure 6.57 Operation comparison of the fall instruction
Selecting this option avoids
execution of the fall instruction
whose execution condition is "off".
Completion of
online change
END
1 scan
END END00 0
OFF OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON OFF
X0 status
XO
MO
XO
MO
The fall instruction is executed
even if the execution condition is off off.
[ PLF MO ]
XO
A
A
(a) Operation when deselecting "Trailing
edge instructions are not executed"
Completion of
online change
END
1 scan
END END00 0
OFF OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON OFF
X0 status
XO
MO
XO
MO
The rise instruction is not
executed even if the execution
condition is off off.
[ PLF MO ]
XO
A
A
(b) Operation when "Trailing edge instructions are not executed" is checked.
The fall instruction is not executed
when the timing of completion of
online change and execution
condition of on off are met.