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3 Configuration of Instruction

FXCPU Structured Programming Manual

[Basic & Applied Instruction]

O

utlin
e

Instruc

tion Li

st

Configurati

on of 

Instruction

Ho

w t

o R

ea

d 

Explanati

on of 

Ins
truction

s

B

asic

 Instruction

Step Ladder 

Instruct

ions

Ap

pl

ied Inst

ruct
io

ns 

(Program Flow)

Appl
ied

 In

stru
cti

ons 

(Mov

e and 

C

omp
are)

App
lie

d Instr

uction
s 

(Ari
thm
eti

c and

 

Lo

gic

al O

per

at

ion)

App
lied Inst

ructi
ons 

(Rot
ati

on and 

Shift O

perati

on)

A device is expressed by a device or an address.

The device is expressed by a device name and a device number.

An address is expressed by a method defined by IEC61131-3. 
It is expressed as follows according to IEC61131-3.

• Position of memory area

This is the first classification to identify the position of memory area either by input, output and internal
where data is allocated.
X (X device)

:I (Input)

Y (Y device)

:Q (Output)

Device other than above :M (Internal)

• Size

The principle of expression method corresponding to device (method of expression for MELSEC) is as 
follows. 
Bit device

:X (Bit)

Word device :W (Word), D (Double word)

• Classification

This is the second classification to identify the types of device that cannot be classified only by the above
position and size. 
X or Y of a device does not classify.

Refer below for the expression corresponding to the device expression.

→ Appendix A

%

I

Input

(Omitted)

Bit

These are the numbers for 
detailed classification. This 
number is separated by "." 
(period) from subsequent 
numbers.
This number may be 
omitted.

The number that indicates a 
device number (decimal 
number).

Q

Output

X

Bit

M

Internal

W

Word (16 bits)

D

Double word (32 bits)

X 0

D 100

Device name

Device number

%I    X     0

%M  X   1 . 863

Position of
memory area

Size

Classification Number