Device And Address - Mitsubishi Electric MELSEC FX Series Structured Programming Manual

FXCPU Structured Programming Manual
(Application Functions)
3.3

Device and Address

Devices can be described in two methods, device method and address method.
Device method
In this method, a device is described using the device name and device number.
X 0
Device name Device number
Address method
This method is defined in IEC61131-3, and used as shown in the table below.
1st character:
Head
Position
I
Q
% M Internal
%I X 0
Memory area Size
position
• Memory area position
The memory area position in which data is assigned is classified into "input", "output" or "internal".
X(X Device method) : I(Input)
Y(Y Device method) : Q(Output)
Any other device
• Size
The principle of the description method corresponding to the device method (MELSEC description method)
is as follows:
Bit device
Word device : W(Word (16 bits)), D(Double word (32 bits))
• Classification
The 3rd and later characters indicate the device type which cannot be specified only by the position and
size explained above.
The classification is not required for devices "X" and "Y".
Refer to the following for the device description method:
32
D 100
2nd character: Size
Input (Omitted)
Output X
W Word (16 bits)
D Double word (32 bits)
L Long Word (64 bits)
%M X 1 . 863
Classification Number
: M(Internal)
: X(Bit)
3rd and later characters:
Classification
Bit This number is provided for
detailed classification.
Bit
Period (.) is used to delimit
the subsequent "Number".
The characters for
classification may be omitted.
3 Function Construction
3.3 Device and Address
Number
This decimal number
corresponds to the device
number.
→ 7.3 Appendix A