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

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.

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