Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual page 109

Processing details
■LDP, LDF
• The LDP instruction is the rising edge pulse operation start instruction, and becomes conductive (ON) only at the rising
edge (OFF to ON) of the specified bit device. When word devices are specified by bits, this instruction becomes conductive
(ON) only when the status of the specified bit changes to 01. When only the LDP instruction is programmed, operation is
the same as the conversion of the instruction under execution to pulse instruction (P).
The following figure shows an example when a ladder using the LDP instruction is replaced with a ladder not using the LDP
instruction.
X0
MOV K0 D0
X0
M0
• The LDF instruction is the falling edge pulse operation start instruction, and becomes conductive (ON) at the falling edge
(ON to OFF) of the specified bit device. When word devices are specified by bits, this instruction becomes conductive only
when the status of the specified bit changes to 10.
■ANDP, ANDF
• The ANDP instruction is the rising edge pulse series connection instruction, and the ANDF instruction is the falling edge
pulse series connection. These instructions AND with the operation result so far, and uses the result as the operation result.
The table below shows the ON/OFF information used by these instructions.
Device specified by ANDP, ANDF
Bit device
OFF to ON
OFF
ON
ON to OFF
■ORP, ORF
• The ORP instruction is the rising edge pulse parallel connection instruction, and the ORF instruction is the falling edge
pulse parallel connection instruction. These instructions OR with the operation result so far, and use the result as the
operation result. The table below shows the ON/OFF information used by these instructions.
Device specified by ORP, ORF
Bit device
OFF to ON
OFF
ON
ON to OFF
Operation error
There is no operation error.
X0
MOVP
X0
Bit specification of word
device
01
0
1
10
Bit specification of word
device
01
0
1
10
K0 D0
PLS M0
ANDP status ANDF status
ON OFF
OFF OFF
OFF OFF
OFF ON
ORP status ORF status
ON OFF
OFF OFF
OFF OFF
OFF ON
6 SEQUENCE INSTRUCTIONS
6.1 Contact Instructions
6
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