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5-8
LDPI,LDFI,ANDPI,ANDFI,ORPI,ORFI
(2) LDFI is the trailing edge pulse NOT operation start instruction that is on only at the trailing
edge of the specified bit device (when the bit device goes from off to on) or when the bit
device is on or off. If a word device has been specified, LDFI is on only when the specified
bit is 0, 1, or changes from 0 to 1.
ANDPI, ANDFI
(1) ANDPI is a leading edge pulse NOT series connection, and ANDFI is a trailing pulse NOT
series connection. ANDPI and ANDFI execute an AND operation with the previous operation
result, and take the resulting value as the operation result.
The on or off data used by ANDPI and ANDFI are indicated in the table below.
ORPI, ORFI
(1) ORPI is a leading edge pulse NOT parallel connection, and ORFI is a trailing pulse NOT
parallel connection. ORPI and ORFI execute an OR operation with the previous operation
result, and take the resulting value as the operation result.
The on or off data used by ORPI and ORFI are indicated in the table below.
Operation Error
(1) There are no operation errors with LDPI, LDFI, ANDPI, ANDFI, ORPI, or ORFI instruction.
Device Specified in LDPI or LDFI
LDPI State LDFI State
Bit Device
Bit Designated for
Word Device
OFF to ON 0 to 1 OFF ON
OFF 0ON
ON
ON 1
ON ON
ON to OFF 1 to 0
ON
OFF
Device Specified in ANDPI or ANDFI
LDPI State LDFI State
Bit Device
Bit Designated for
Word Device
OFF to ON 0 to 1 OFF ON
OFF 0ON
ON
ON 1
ON ON
ON to OFF 1 to 0
ON
OFF
Device Specified in ORPI or ORFI
ORPI State ORFI State
Bit Device
Bit Designated for
Word Device
OFF to ON 0 to 1 OFF ON
OFF 0ON
ON
ON 1
ON ON
ON to OFF 1 to 0
ON
OFF