Mitsubishi MELSEC iQ-F FX5 series Programming Manual page 105

Processing details
■LDPI, LDFI
• The LDPI instruction is the rising edge pulse NOT operation start instruction, and becomes conductive (ON) at OFF, ON
and the falling edge (ON to OFF) of the specified bit device. When word devices are specified by bits, this instruction
becomes conductive when the status of the specified bit is 0, 1, and when it changes 10.
• The LDFI instruction is the falling edge pulse NOT operation start instruction, and becomes conductive (ON) at the rising
edge (OFF to ON), OFF and ON of the specified bit device. When word devices are specified by bits, this instruction
becomes conductive (ON) when the status of the specified bit is 0, 1, and when it changes 01. The table below shows the
ON/OFF information used by these instructions.
Device specified by LDPI, LDFI
Bit device
OFF to ON
OFF
ON
ON to OFF
■ANDPI, ANDFI
• The ANDPI instruction is the rising edge pulse NOT series connection instruction, and the ANDFI instruction is the falling
edge pulse NOT series connection instruction. These instructions AND 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 ANDPI, ANDFI
Bit device
OFF to ON
OFF
ON
ON to OFF
■ORPI, ORFI
• The ORPI instruction is the rising edge pulse NOT parallel connection instruction, and the ORFI instruction is the falling
edge pulse NOT 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 ORPI, ORFI
Bit device
OFF to ON
OFF
ON
ON to OFF
Operation error
There is no operation error.
Bit specification of word
device
01
0
1
10
Bit specification of word
device
01
0
1
10
Bit specification of word
device
01
0
1
10
LDPI status LDFI status
OFF ON
ON ON
ON ON
ON OFF
ANDPI status ANDFI status
OFF ON
ON ON
ON ON
ON OFF
ORPI status ORFI status
OFF ON
ON ON
ON ON
ON OFF
5 SEQUENCE INSTRUCTIONS
5.1 Contact Instructions
5
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