5. SEQUENCE INSTRUCTIONS
5 − 25
MELSEC-A
POINT
If a PLS or PLF instruction is caused to jump by a CJ instruction, if the
sub-routine program executed by a PLS/PLF command was not called by a
CALL instruction, the device specified by (D) will go On for 1 scan or longer,
so exercise caution.
Program Examples PLS
Program which executes the PLS instruction when M9 turns on.
PLF
Program which executes the PLF instruction when M9 turns off.
• Coding
0 LD X009
1 PLS M9
4 END
ON
X9 OFF
M9 OFF
ON
1 scan
• Coding
0 LD X009
1 PLF M9
4 END
X009
PLS M9
0
X009
PLF M9
0
M9 OFF
ON
1 scan
ON
X9 OFF
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