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<List of instructions not explained in this chapter: part 1>
"Introduction: PLC Course" covers the instructions shown below. The conventional A
series also support them.
Refer to "MELSEC-Q/L Programming Manual Common Instruction" for more details.
Instruction
symbol
(Name)
Function Drawing (devices to be used)
Instruction
symbol
(Name)
Function Drawing (devices to be used)
LD
Load
Starting a logical
operation
Starting to operate
a normally open
contact
Specifies a bit of a bit device
or word device.
MRD
Lead
Intermediate
branching
LDI
Load
inverse
Starting a logical
inverse operation
Starting to operate
a normally closed
contact
Specifies a bit of a bit device
or word device.
MPP
Pop
Terminating
branching
AND
And
Logical AND
operation
Series connection
of normally open
contacts
Specifies a bit of a bit device
or word device.
NOP
Nop
Ignored
For a space or deleting a
program
ANI
And
inverse
Logical AND
inverse operation
Series connection
of normally closed
contacts
Specifies a bit of a bit device
or word device.
END
End
END processing of
terminating a
program
Must be used as an end of a
program.
OR
Or
Logical OR
operation
Parallel connection
of normally open
contacts
Specifies a bit of a bit device
or word device.
STOP Stopping operation
STOP
ORI
Or inverse
Logical OR inverse
operation
Parallel connection
of normally closed
contacts
Specifies a bit of a bit device
or word device.
SFT
Shift
1-bit shift for
devices
Specifies a bit of a bit device
or word device.
SFT
ANB
And block
AND operation
between logical
blocks
Series connection
of blocks
SFTP
Shift P
1-bit shift for
devices (pulsing
operation)
Specifies a bit of a bit device
or word device.
SFTP
ORB
Or block
OR operation
between logical
blocks
Parallel connection
of blocks
NOPLF
Ignored
(for a page break
at printing)
NOPLF
MPS
Push
Starting a branch
PAGE
Ignored
(Recognized as
zero step of n-page)
n
PAGE