138
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
6 What to Understand before Programming
6.1 How to Read Explanation of Instructions
Outline
1. Instruction format
1) The applied instruction number (FNC No.) and instruction mnemonic are indicated. The table below
shows the meaning of simplified expression.
2. Set data
The contents of devices that can be specified as operands in instructions and available data types are
described below:
1) Contents
The contents of operands in each instruction are described below.
2) Indexing of the source and destination
In operands to which "
" is added such as
and
, indexing is available.
Operands not allowing indexing are expressed as
and
.
3) Data types
- Bit
: Bit device
- 16-bit BIN
: 16-bit binary code
- 32-bit BIN
: 32-bit binary code
- 64-bit BIN
: 64-bit binary code
- 16/32-bit BIN
: 16-bit or 32-bit binary code
- 32/64-bit BIN
: 32-bit or 64-bit binary code
- 4-digit BCD
: 4-digit (16-bit) BCD code
- 8-digit BCD
: 8-digit (32-bit) BCD code
- 4/8-digit BCD
: 4-digit (16-bit) or 8-digit (32-bit) BCD code
- Character string
: Character code such as ASCII code and shift JIS code
- Character string (only ASCII)
: ASCII code
- Real number (binary)
: Binary floating point
- Real number (decimal)
: Scientific notation
Mark
Description
Applicable
instruction
(example)
Dotted lines on the upper left and lower left sides indicate an independent
instruction not associated with the 16-bit or 32-bit type.
WDT(FNC 07)
Continuous lines on the upper left side indicates that 16-bit type is available.
"D" on the lower left side indicates that the 32-bit type is available.
MOV(FNC 12)
Dotted lines on the lower left side indicate that the 32-bit type does not exist.
Continuous lines on the upper left side indicate that only the 16-bit type is
available.
CJ(FNC 00)
Dotted lines on the upper left side indicate that the 16-bit type does not exist.
"D" on the lower left side indicates that only the 32-bit type is available.
HSCS(FNC 53)
Continuous lines on the upper right side indicate that the continuous operation
type is available. "P" on the lower right side indicates that the pulse operation
type is available.
CMP(FNC 10)
Dotted lines on the lower right side indicate that the pulse operation type does
not exist. Continuous line on the upper right side indicate that only the
continuous operation type is available.
MTR(FNC 52)
"
"
on the upper right side indicates that the contents of the destination
change in every operation cycle when the continuous operation type is used.
When operation should be executed only once at driving of an instruction, use
the pulse operation type indicated by "P" on the lower right side.
INC(FNC 24)
P
FNC 12
MOV
No.
Instruction name
P
FNC 12
MOV
D
No.
Instruction name
P
FNC 12
MOV
No.
Instruction name
D
P
FNC 12
MOV
D
No.
Instruction name
D
P
FNC 12
MOV
No.
Instruction name
P
D
FNC 12
MOV
No.
Instruction name
D
P
FNC 12
MOV
No.
Instruction name
S
S
1
S
S
1