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4 How to Read Explanation of Instructions
51
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
1
Outline
2
Instruction List
3
Configuration of
Instruction
4
How to Read
Explanation of
Instructions
5
Basic Instruction
6
Step Ladder
Instructions
7
Applied Instructions
(Program Flow)
8
Applied Instructions
(Move and
Compare)
9
Applied Instructions
(Arithmetic and
Logical Operation)
10
Applied Instructions
(Rotation and
Shift Operation)
1) Indicates the corresponding chapter, section, subsection, number and instruction name.
2) Indicates the PLCs that support the instruction.
3) Indicates the data length, operation form and expression of each instruction.
Some PLCs do not support "16 bits / 32 bits" or "continuous / pulse" depending on their versions.
Refer to "Cautions".
4) Indicates the names of the input and output variables of the instruction and the contents and data type of
each variable.
Refer to the following manual for details of data type.
→ Q/L/F Structured Programming Manual (Fundamentals)
5) Applicable devices
"
z" indicates the devices that can be used in an instruction.
Devices marked "S" have restrictions in use.
Refer to "Cautions".
6) Function and operation explanation
Explains the functions that the instruction is responsible for.
This explanation uses an example of structured ladder language.
7) Summarizes the notes before using the instruction.
8) Program example
Explains a program example in each language.
In program examples of the structured ladder/FBD language, the structured ladder language is adopted
as the representative.
Item Descriptions
Supported by PLCs from the first release.
The support conditions depend on the versions.
"Cautions" explains the applicable versions.
This particular series PLCs do not support the instruction.
Item Descriptions
16 bits An instruction of 16-bit data length
32 bits An instruction of 32-bit data length
Continuous
This is a continuous execution instruction that is executed in each cycle of
operation while the execution condition (EN) is being satisfied.
Pulse
This is a pulse execution instruction that is executed only when the execution
condition (EN) changes from the state of not established to the state of established.
Structured ladder/
FBD
Indicates the instruction expression in the structured ladder language adopted as
the representative.
ST Indicates a ST language instruction.