Mitsubishi MELSEC Q4ARCPU User manual

Q4ARCPU
Mitsubishi Programmable Logic Controller
User's Manual
(Hardware)
Thank you for purchasing the Mitsubishi programmable logic controller
MELSEC-QnA Series.
Prior to use, please read both this and relevant manuals
thoroughly to fully understand the product.
MODEL Q4ARCPU-U(H/W)-E
MODEL
CODE 13J851
IB(NA)-66684-G(0705)MEE
©1996 MITSUBISHI ELECTRIC CORPORATION

A-1
SAFETY PRECAUTIONS 
(Be sure to read these instructions before use.)
Before using the product, read this and relevant manuals carefully and handle the
product correctly with full attention to safety.
In this manual, SAFETY PRECAUTIONS are classified into 2 levels:
"DANGER" and "CAUTION".
Indicates that incorrect handling may cause hazardous
conditions, resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous
conditions, resulting in minor or moderate injury and/or
property damage.
Under some circumstances, failure to observe the CAUTION level
instructions may also lead to serious results.
Be sure to observe the instructions of both levels to ensure the safety.
Please keep this manual in a safe place for future reference and also pass this
manual on to the end user.
[DESIGN PRECAUTIONS]
DANGER
Create a safety circuit outside the PLC to ensure the whole system will
operate safely even if an external power failure or a PLC failure occurs.
Otherwise, incorrect output or malfunction may cause an accident.
(1) For an emergency stop circuit, protection circuit and interlock circuit that
is designed for incompatible actions such as forward/reverse rotation or
for damage prevention such as the upper/lower limit setting in
positioning, any of them must be created outside the PLC.
(2) When the PLC detects the following error conditions, it stops the
operation and turn off all the outputs.
The overcurrent protection device or overvoltage protection device of
the power supply module is activated.
The PLC CPU detects an error such as a watchdog timer error by the
self-diagnostics function.
In the case of an error of a part such as an I/O control part that cannot
be detected by the PLC CPU, all the outputs may turn on. In order to
make all machines operate safely in such a case, set up a fail-safe circuit
or a specific mechanism outside the PLC.
Refer to "LOADING AND INSTALLATION" in this manual for example
fail safe circuits.
DANGER
CAUTION

A-2
[DESIGN PRECAUTIONS]
DANGER
(3) Depending on the failure of the output module’s relay or transistor, the
output status may remain ON or OFF incorrectly. For output signals that
may lead to a serious accident, create an external monitoring circuit.
If load current more than the rating or overcurrent due to a short circuit
in the load has flowed in the output module for a long time, it may
cause a fire and smoke. Provide an external safety device such as a
fuse.
Design a circuit so that the external power will be supplied after
power-up of the PLC.
Activating the external power supply prior to the PLC may result in an
accident due to incorrect output or malfunction.
For the operation status of each station at a communication error in
data link, refer to the respective data link manual.
The communication error may result in an accident due to incorrect
output or malfunction.
When controlling a running PLC (data modification) by connecting a
peripheral device to the CPU module or a PC to a special function module,
create an interlock circuit on sequence programs so that the whole system
functions safely all the time.
Also, before performing any other controls (e.g. program modification,
operating status change (status control)), read the manual carefully and
ensure the safety.
In these controls, especially the one from an external device to a PLC in a
remote location, some PLC side problem may not be resolved immediately
due to failure of data communications.
To prevent this, create an interlock circuit on sequence programs and
establish corrective procedures for communication failure between the
external device and the PLC CPU.
For the redundant power supply system, use the A37RHB redundant power
supply main base unit and the A68RB redundant power supply extension
base unit.
When using an old model, A3 B, A5 B or A6 B, set the output hold/reset
setting switch on the CPU module to the output reset mode. Inadvertently
using it in the output hold mode may result in an accident due to incorrect
output and/or malfunctions.
When setting up the system, do not allow any empty slot on the base unit.
If any slot is left empty, be sure to use a blank cover (A1SG60) or a dummy
module (A1SG62) for it.
When using the extension base unit, A52B, A55B or A58B, attach the
included dustproof cover to the module in slot 0.
Otherwise, internal parts of the module may be flied in the short circuit test or
when an overcurrent or overvoltage is accidentally applied to external I/O
section.

A-3
[DESIGN PRECAUTIONS]
CAUTION
Do not install the control lines or communication cables together with the
main circuit or power lines, or bring them close to each other.
Keep a distance of 100mm (3.94inch) or more between them.
Failure to do so may cause malfunctions due to noise.
If having read register R outside the allowable range with the MOV
instruction, the file register data will be FFFFH. Using this as it is may cause
malfunctions. Pay attention not to use any out-of-range file register when
designing sequence programs. For instruction details, refer to the
programming manual.
When an output module is used to control the lamp load, heater, solenoid
valve, etc., a large current (ten times larger than the normal one) may flow at
the time that the output status changes from OFF to ON. Take some
preventive measures such as replacing the output module with the one of a
suitable current rating.
[INSTALLATION PRECAUTIONS]
CAUTION
Use the PLC under the environment specified in the user’s manual.
Otherwise, it may cause electric shocks, fires, malfunctions, product
deterioration or damage.
Hold down the module loading lever at the module bottom, and securely
insert the module fixing latch into the fixing hole in the base unit.
Incorrect loading of the module can cause a malfunction, failure or drop.
When using the PLC in the environment of much vibration, tighten the
module with a screw.
Tighten the screw in the specified torque range. Undertightening can cause a
drop, short circuit or malfunction. Overtightening can cause a drop, short
circuit or malfunction due to damage to the screw or module.
Connect the extension cable to the connector of the base unit or module.
Check the cable for incomplete connection after connecting it.
Poor electrical contact may cause incorrect inputs and/or outputs.
Insert the memory card and fully press it to the memory card connector.
Check for incomplete connection after installing it.
Poor electrical contact may cause malfunctions.
Be sure to shut off all phases of the external power supply used by the
system before mounting or removing the module. Failure to do so may
damage the module.
Do not directly touch the conductive part or electronic components of the
module.
Doing so may cause malfunctions or a failure of the module.

A-4
[WIRING PRECAUTIONS]
DANGER
Be sure to shut off all phases of the external power supply used by the
system before wiring.
Failure to do so may result in an electric shock or damage of the product.
Before energizing and operating the system after wiring, be sure to attach the
terminal cover supplied with the product.
Failure to do so may cause an electric shock.
CAUTION
Always ground the FG and LG terminals to the protective ground conductor.
Failure to do so may cause an electric shock or malfunctions.
Wire the module correctly after confirming the rated voltage and terminal
layout.
Connecting a power supply of a different voltage rating or incorrect wiring
may cause a fire or failure.
Do not connect multiple power supply modules to one module in parallel. The
power supply modules may be heated, resulting in a fire or failure.
Press, crimp or properly solder the connector for external connection with the
specified tool.
Incomplete connection may cause a short circuit, fire or malfunctions.
Tighten terminal screws within the specified torque range. If the screw is too
loose, it may cause a short circuit, fire or malfunctions.
If too tight, it may damage the screw and/or the module, resulting in a short
circuit or malfunctions.
Carefully prevent foreign matter such as dust or wire chips from entering the
module.
Failure to do so may cause a fire, failure or malfunctions.
Install our PLC in a control panel for use.
Wire the main power supply to the power supply module installed in a control
panel through a distribution terminal block.
Furthermore, the wiring and replacement of a power supply module have to
be performed by a maintenance worker who acquainted with shock
protection.
(For the wiring methods, refer to Q4ARCPU User’s Manual.)

A-5
[STARTUP AND MAINTENANCE PRECAUTIONS]
DANGER
Do not touch any terminal during power distribution.
Doing so may cause an electric shock.
Properly connect batteries. Do not charge, disassemble, heat or throw them
into the fire and do not make them short-circuited and soldered. Incorrect
battery handling may cause personal injuries or a fire due to exothermic heat,
burst and/or ignition.
Be sure to shut off all phases of the external power supply used by the
system before cleaning or retightening the terminal screws or module
mounting screws.
Failure to do so may result in an electric shock.
If they are too loose, it may cause a short circuit or malfunctions.
If too tight, it may cause damage to the screws and/or module, resulting in an
accidental drop of the module, short circuit or malfunctions.
CAUTION
When performing online operations (especially, program modification, forced
output or operating status change) by connecting a peripheral device to the
running CPU module, read the manual carefully and ensure the safety.
Incorrect operation will cause mechanical damage or accidents.
Do not disassemble or modify each of modules.
Doing so may cause failure, malfunctions, personal injuries and/or a fire.
When using a wireless communication device such as a mobile phone, keep
a distance of 25cm (9.84inch) or more from the PLC in all directions.
Failure to do so may cause malfunctions.
Be sure to shut off all phases of the external power supply used by the
system before mounting or removing the module.
Failure to do so may result in failure or malfunctions of the module.
When replacing the fuse, use a fuse specified by the manufacturer.
Using the one for the high-rated current or an electric wire may cause a fire.
Do not drop or apply any impact to the battery.
Doing so may damage the battery, resulting in electrolyte spillage inside the
battery.
If any impact has been applied, discard the battery and never use it.
Before handling modules, touch a grounded metal object to discharge the
static electricity from the human body.
Failure to do so may cause failure or malfunctions of the module.

A-6
[DISPOSAL PRECAUTIONS]
CAUTION
When disposing of the product, treat it as an industrial waste.
[TRANSPORTATION PRECAUTIONS]
CAUTION
When transporting lithium batteries, make sure to treat them based on the
transportation regulations. (Refer to Chapter 7 for details of the relevant
models.)

A-7
REVISIONS
*The manual number is given on the bottom right of the front cover.
Print Date *Manual Number Revision
Sep., 1996 IB(NA) 66684-A First edition
Nov., 2000 IB(NA) 66684-B Addition of model
AX11EU, AX21EU, AX41-S1, AX42-S1,
AX81-S1, AX81-S3, AY11AEU, AY11EEU,
AY13EU, AY15EU, AY20EU, AY42-S1,
AY42-S2, A61PN, A62PN, A67RP
Correction
Safety precautions, Section 4.1.2, 4.5.2, 6.2
Addition
Specifications, Performance specifications,
EMC standards, Low-Voltage instruction
Jun., 2003 IB(NA) 66684-C Correction
Safety precautions, Section 6.2
Dec., 2004 IB(NA) 66684-D Correction
Safety precautions, Section 1.1, Chapter 3,
Section 3.1, 3.1.1, 3.2, 4.2, 4.4, 6.2, 6.3
Addition
Section 6.1, Chapter 7, Section 7.1, 7.2
Section changes
Sections 6.1 and 6.2 are changed to Sections
6.2 and 6.3, respectively.
Jul., 2005 IB(NA) 66684-E Correction
Safety precautions, Section 3.1.1, 3.1.2, 3.1.3,
3.1.4, 3.2, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.7, 4.2,
4.3.1, 4.3.3, 4.4, 4.5.1, 4.5.2, 5.1.1, 5.1.2,
5.2.1, 6.3
Oct., 2006 IB(NA) 66684-F Correction
Safety precautions, Section 1.1, 3.1.3, 3.2.4,
3.2.6, 4.3.1, 4.3.2, 4.3.3, 4.3.4, 6.3

A-8
Print Date *Manual Number Revision
May, 2007 IB(NA) 66684-G Partial Correction
Section 3.1, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.6,
3.2.5, 3.2.7, 4.3.3, 4.3.4, 4.4, 6.3
Japanese Manual Version IB(NA)68613-G
This manual confers no industrial property rights or any rights of any other kind,
nor dose it confer any patent licenses. Mitsubishi Electric Corporation cannot be
held responsible for any problems involving industrial property rights which may
occur as a result of using the contents noted in this manual.
©1996 Mitsubishi Electric Cor
p
oration