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To avoid execution of the fall instruction even when the execution condition (on
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.
Selecting this option avoids
execution of the fall instruction
whose execution condition is "off".
Figure 6.57 shows operations of the fall instruction depending on the setting of "Trailing edge instructions are not executed"
in GX Developer.
Completion of
XO
online change
END
0
A
END
1 scan
X0 status
ON
XO
OFF
OFF
OFF
ON
MO
OFF
ON
XO
OFF
ON
OFF
ON
MO
OFF
(a) Operation when deselecting "Trailing
edge instructions are not executed"
6 - 66
Figure 6.56 Options screen
[ PLF MO ]
0
A
END
0
The fall instruction is executed
even if the execution condition is off
Figure 6.57 Operation comparison of the fall instruction
Completion of
online change
A
END
0
END
X0 status
ON
off.
XO
OFF
OFF
OFF
ON
MO
OFF
ON
XO
OFF
ON
OFF
ON
MO
OFF
(b) Operation when "Trailing edge instructions are not executed" is checked.
off) is not met after data are written to the
XO
[ PLF MO ]
0
A
END
0
1 scan
The rise 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.
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