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