Mitsubishi Electric MELSEC System Q, Special Instructions Manual

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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.

Written formats in the structured ladder/FBD and structured text language.

Indicates the instruction name and executing condition of the instruction.

Indicates the names of input and output arguments, and the data type of each argument. For details of each data type, refer
to the following.

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.
*6 Link direct devices (J
 \  ) cannot be used for LCPU.

Indicates the processing performed by the instruction.

Indicates data such as control data, send data or receive data, that are used for an input argument or output argument in an
instruction.
The setting side indicates the following:
• User : Data set by user before dedicated instruction execution
• System : Data stored by the programmable controller CPU after dedicated instruction execution. The setting does not need
to be set by the user. If the setting is set by the user, data cannot be read normally.

Indicates the program examples of structured ladder/FBD/ST.
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
J
 \ 
*4*6
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*2
T
*3
, ST
*3
,
C
*3
, D, W,
SD, SW,
FD
*2
, @ 
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
LCPU
CC IE C
Universal
CC IE F
High
performance
NET/H
Process
Ether
Redundant