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4-3
4
HOW TO READ
INSTRUCTIONS
Indicates the instruction execution target module.
If one instruction is to be executed in two or more modules, applicable modules are indicated
using icons.
Indicates the instruction name and executing condition of the instruction.
Indicates the instruction names that can be described.
Written formats in the structured ladder/FBD and structured text language
Indicates the names of input and output arguments, and the data type of each argument. For
details of each data type, refer to MELSEC-Q/L/F structured programming manual
(Fundamentals).
Devices that can be used in the instruction are marked with .
The following table shows applicable classification for usable devices.
*1 : For description of each device, refer to the User's Manual (Function Explanation, Program Fundamentals) of
the CPU module currently being used.
*2 : FX and FY can be used in bit data only, and FD can be used in word data only in the PID control instruction.
*3 : T, ST, and C can be used in word data only (cannot be used in bit data).
*4 : These devices can be used in CC-Link IE, MELSECNET/H, and MELSECNET/10.
*5 : The Constant and Others columns describe settable devices.
Module Icon Module Icon
Serial communication Built-in Ethernet port QCPU
Modem interface High-speed Universal model QCPU
CC-Link LCPU
CC-Link IE Controller Network Universal model QCPU
CC-Link IE Field Network High Performance model QCPU
MELSECNET/H Process CPU
Ethernet Redundant CPU
Executing condition
Non-conditional
execution
Executed
while ON
Executed
once at ON
Executed
while OFF
Executed
once at OFF
Symbols on the
corresponding page
No symbol
Device
classification
Internal device
(system, user)
File
register
R, ZR
Link direct device
*4
J\
Intelligent
function
module
U\G
Index
register
Zn
Constant
*5
Others
*5
Bit Word Bit Word
Usable
device
*1
X, Y, M, L,
SM, F,
B, SB,
FX, FY
*2
T, ST, C,
*3
D, W, SD,
SW, FD,
@
R, ZR
J \X
J
\Y
J \B
J \SB
J \W
J \SW
U\G
Z
K, H, E, $,
P, I, J, U,
DX, DY, N,
BL, TR,
BL
\
S, V
Serial
QnUDE(H)
Modem
QnUDV
CC-Link
L CPU
CC IE C
Universal
CC IE F
High
performance
NET/H
Process
Ether
Redundant