6 SEQUENCE INSTRUCTIONS
6.1 Contact Instructions
107
6
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.
• 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.
■
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.
Operation error
There is no operation error.
Device specified by ANDP, ANDF
ANDP status
ANDF status
Bit device
Bit specification of word
device
OFF to ON
0
1
ON
OFF
OFF
0
OFF
OFF
ON
1
OFF
OFF
ON to OFF
1
0
OFF
ON
Device specified by ORP, ORF
ORP status
ORF status
Bit device
Bit specification of word
device
OFF to ON
0
1
ON
OFF
OFF
0
OFF
OFF
ON
1
OFF
OFF
ON to OFF
1
0
OFF
ON
D0
X0
X0
X0
X0
M0
MOVP
K0
D0
MOV
K0
PLS
M0
Summary of Contents for MELSEC iQ-F FX5
Page 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
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Page 1050: ...1048 26 TIME DATA FUNCTIONS 26 4 Division MEMO ...
Page 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
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