Leading Edge And Trailing Edge Outputs: Pls, Plf - Mitsubishi Electric MELSEC Q Series Programming Manual

5 SEQUENCE INSTRUCTIONS FOR MOTION CPU

5.3.8 Leading edge and trailing edge outputs: PLS, PLF

Setting
data
X Y M
(D)
[Setting data]
[Function]
Bit device
SM F T C D
[Instruction]
Command
PLS
Command
PLF
Setting data
(D)
(1) Leading edge output (PLS)
• Turns ON the designated device when the execution command is turned
OFF→ON, and turns OFF the device in any other case the execution command
is turned OFF→ON (i.e., at ON→ON, ON→OFF or OFF→OFF of the execution
command).
• If the RUN/STOP key switch is changed from RUN to STOP after the execution
of the PLS instruction, the PLS instruction will not be executed again even if the
switch is set back to RUN.
• When designating a latch device for the execution command and turning the
power supply OFF to ON with the latch device ON, the execution command
turns OFF to ON at the first scan, executing the PLS instruction and turning ON
the designated device.
The device turned ON at the first scan after power-ON turns OFF at the next
PLS instruction.
(2) Trailing edge output (PLF)
• Turns ON the designated device when the execution command is turned
ON→OFF, and turns OFF the device in any other case the execution command
is turned ON→OFF (i.e., at OFF→OFF, OFF→ON or ON→ON of the execution
command).
• If the RUN/STOP key switch is changed from RUN to STOP after the execution
of the PLF instruction, the PLF instruction will not be executed again even if the
switch is set back to RUN.
Usable device
Word device
W T C SD Z
Pulse conversion device (bits)
5 - 25
Constant Pointer Level
K H P N
PLS (D)
PLF (D)
Description
Digit
desig- Index
nation
: Usable