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MELSEC-Q/QnA
4 HOW TO READ INSTRUCTIONS
4. HOW TO READ INSTRUCTIONS
The description of instructions that are contained in the following chapters are presented in the
following format.
1
2
3
4
5
6
8
1
Code used to write instruction (instruction symbol).
2
Section number and general category of instructions being discussed.
3
Devices which can be used by the instruction in question are indicated with circle.
The types of devices that can be used are as indicated below:
Internal Devices
(System, User)
MELSECNET/10(H) 3
Direct J
\
Device Type
Bit Word
File Register
Bit Word
Special
Function
Module
U
\G
Index
Register
Zn
Constant
1
Other
1
Usable 4
devices
X, Y, M, L,
SM, F, V, B,
SB, FX, FY
2
T, ST, C,
5
D, W, SD,
SW, FD,
@
R, ZR
J
\X
J
\Y
J
\B
J
\SB
J
\W
J
\SW
U
\G Z
Decimal
constants
Hexadecimal
constants
Real number
constant
Character
strin
constant
P, I, J, U,
DX, DY, N,
BL, TR,
BL\S, V
1
: Devices which can be set are recorded in the "Constant" and the "Other" columns.
2
: FX and FY can be used only for bit data, and FD only for word data.
3
: Usable with the MELSECNET/H, and MELSECNET/10.
4
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