Panasonic FP-E Programming Manual page 1063

Precautions when using an instruction which performs leading edge detection
When RUN begins, for example when the system is powered on, the off → on change
of the trigger is not detected. The instruction is not executed. Execution of the
instruction will take place as explained on the following page.
When used with one of the instructions indicated in instructions below which change
the order of execution of instructions, the operation of the instruction may change
depending on input timing. Take care regarding this point.
Be careful when using leading edge detection type instructions with control instructions,
such as:
− MC and MCE instructions
− JP and LBL instructions
− F19 (SJP) and LBL instructions for FP−C/FP2/FP2SH/FP3/FP10SH only
− LOOP and LBL instructions
− CNDE instruction
− Step ladder instructions
− Subroutine instructions
4.3.2 Operation and Precautions at Run Start Time
Operation of first scan after RUN begins
The leading edge detection instruction is not executed when the mode has been
switched to the RUN mode, or when the power supply is booted in the RUN mode, if
the execution condition is already on.
RUN
(Power on)
Trigger
Operation
Not executed
If you need to execute an instruction when the trigger (execution condition) is on prior
to switching to RUN mode, use the special internal relay R9014 in your program as
follows. (R9014 is a special internal relay which is off during the first scan and turns on
at the second scan.)
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4.3 Leading Edge Detection Method
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