Panasonic FP0 User Manual

Precautions During Programming FP0
8 − 16
8.5 Instruction of Leading Edge Detection Method
8.5.3 Precautions When Using a Control Instruction
Instructions which leading edge detection compare the condition of the previous
execution and the condition of the current execution, and execute the instruction only
if the previous condition was off and the current condition is on. In any other case, the
instruction is not executed.
When a leading edge detection instruction is used with an instruction which changes
the order of instruction execution such as MC, MCE, JP or LBL, the operation of the
instruction may change as follows depending on input timing. Take care regarding this
point.
Example 1:
Using the DF instruction between MC and MCE instructions
X1
DF
Y0
MCE 0
X0
MC 0
Previous
execution of DF
instruction
Previous
execution of DF
instruction
Time chart 2
Time chart 1
X0
X1
Y0
The input condition (X1) for the DF instruction has
not changed since the time of the previous
execution, thus derivative output is not obtained.
X0
X1
Y0
The input condition (X1) for the DF instruction has
changed from off to on since the time of the previous
execution, thus derivative output is obtained.

Panasonic FP0 Specifications

General

Model	FP0
Communication Ports	RS232C, RS485
Power Supply	24V DC
Operating Temperature	0°C to 55°C
Type	Programmable Logic Controller (PLC)
I/O Points	16 to 128